KR102348066B1 - Laser surface treatment method of dental implants by adjustment of glancing angle - Google Patents

Abstract

The present invention relates to a surface treatment method for dental implants by adjustment of a laser emission angle, which comprises a first laser emission step of emitting a first laser having a first emission angle to an implant and a second laser emission step of emitting a second laser having a second emission angle greater than the first irradiation angle to the implant. According to the present invention, since lasers with different emission angles are emitted step by step, the shape of a groove formed on the surface of an implant can be made three-dimensionally and the groove with a random pattern can be formed, thereby providing effects of making the pattern more irregular, and increasing a surface area and a surface friction coefficient.

Description

A method of surface treatment of dental implants by adjusting the irradiation angle of laser {LASER SURFACE TREATMENT METHOD OF DENTAL IMPLANTS BY ADJUSTMENT OF GLANCING ANGLE}

The present invention is directed to a method for treating the surface of a dental implant by controlling the irradiation angle of a laser, and in more detail, it increases the roughness of the surface of the dental implant fixture by irradiating a plurality of lasers having different irradiation angles in multiple steps, , It relates to a method for surface treatment of a dental implant by controlling the irradiation angle of a laser, which can promote osseointegration between implant and alveolar bone by having an amorphous profile without direction.

A dental implant is largely composed of a crown, an abutment, and a fixture.

A double crown is a prosthesis that is exposed over the gums, and is manufactured in a shape and color similar to natural teeth to provide functions of the teeth such as chewing function and maintenance of teeth and natural appearance.

A fixture is a structure that corresponds to the root of a natural tooth, and is firmly inserted and coupled to the alveolar bone in the gum (the bone in which the root is formed in the upper and lower jaws) because of the thread formed on the exterior. It is the abutment that mediates the connection.

In the case of fixtures at the time of introduction of dental implants, the site in contact with the alveolar bone was smooth, so osseointegration failed in many cases. A method of primarily imparting roughness by blasting powder and then etching with a strong acid such as hydrofluoric acid, nitric acid, hydrochloric acid, or sulfuric acid or a mixed acid of strong acids is used.

These blasting and etching methods can impart roughness to the titanium implant surface, but acid remains on the implant frequently. , Korean Patent Publication No. 10-2019-0031783 (Title of the Invention: Dental implant having surface roughness) is disclosed as a prior art for such an implant etching method.

In the prior art, in the dental implant having a surface treated by blasting and etching, the dental implant includes a polymer, and the arithmetic mean height (Ra) of the contour curve of the surface is 0.6 to 3.3 μm, and the contour curve A dental implant with an average element height (Rc) of 2.6 to 15.0 μm is presented.

According to the prior art, it is possible to give roughness to the implant surface using strong acid, that is, increase the surface friction coefficient, but as described above, if hydrofluoric acid remains on the implant surface, corrosion of the alveolar bone and deterioration of osseointegration of the implant are caused. This happens.

Furthermore, in order to solve this problem of the prior art, Korean Patent Registration No. 10-2195610 (title of the invention: laser surface treatment method for increasing the surface friction coefficient of a dental implant) has been disclosed.

The prior art includes a first laser irradiation step of irradiating a first laser having a first energy to the implant; and a second laser irradiation step of irradiating a second laser having a second energy different from the first energy to the implant.

According to the prior art, the implant is irradiated with a laser in two steps so that the depth and pattern of the crater created on the surface of the implant are not uniform, so that the fixing force can be maintained despite the impacts applied to the implant from various directions. In this case, there is a limitation in that the effect of increasing the surface area and the surface friction coefficient is insufficient because only the depth of the crater is different, but a pattern with the same directionality is formed in the form.

Therefore, in order to solve the above-mentioned problems, the implant surface profile, that is, the shape of the crater, is transformed into an amorphous form without direction by irradiating a laser to the implant at different irradiation angles to form craters in different directions. By making it to be generated, there is a need to develop a surface treatment method of an implant that can maximize the effect of increasing the surface area and increasing the surface friction coefficient.

The main object of the present invention is to make the shape of a groove formed on the implant surface, that is, a groove, more three-dimensional by irradiating a laser step-by-step, as well as to indicate a more random pattern of grooves.

Another object of the present invention is to prevent the spatter phenomenon of the implant surface and to increase the ablation efficiency.

Another object of the present invention is to adjust the additional laser irradiation based on the depth of the already formed groove.

It is a further object of the present invention to make it possible to change the irradiation angle through refraction without a separate irradiation angle adjustment.

In order to achieve the above object, the method for surface treatment of a dental implant through the adjustment of the irradiation angle of the laser according to the present invention, a first laser irradiation step of irradiating a first laser having a first irradiation angle to the implant; and a second laser irradiation step of irradiating a second laser having a second irradiation angle greater than the first irradiation angle to the implant.

Furthermore, in the first laser irradiation step, a pulse energy of 50 to 150 mJ having a beam size of 5 to 20 μm and a pulse duration of 5 to 20 ns (nano second) is applied to the first Irradiated with a pulse repetition rate of 15 to 50 kHz to have an irradiation angle, and the second laser irradiation step, a beam size of 0.5 to 5 μm and a pulse duration of 10 to 50 ps (pico second) It is characterized in that the pulse energy of 1 to 10 mJ having a time duration is irradiated with a pulse repetition frequency (repetition rate) of 15 to 50 kHz so as to have the second irradiation angle.

In addition, after the second laser irradiation step, a pulse energy of 0.1 to 5 mJ having a beam size of 0.5 to 2 μm and a pulse duration of 5 to 30 fs (femto second) is applied to the second A third laser irradiation step of irradiating with a pulse repetition frequency (repetition rate) of 15 to 50 kHz to have a third irradiation angle having a second irradiation angle greater than 2 irradiation angle; characterized in that it is included.

In addition, the first, second, and third lasers have a wavelength of 1000 to 1100 nm and a beam quality factor (M²) of 1.1 to 1.5.

According to the method for surface treatment of a dental implant through the adjustment of the irradiation angle of the laser according to the present invention,

1) By irradiating lasers of different irradiation angles step by step, the shape of the grooves formed on the implant surface, that is, the grooves, is made more three-dimensional, and the pattern becomes more irregular by allowing the grooves of a more random pattern to be displayed. In addition to increasing the effect of increasing the surface area and increasing the surface friction coefficient,

2) Implants are irradiated with pulsed lasers (nanosecond lasers and femtosecond lasers) with pulse widths in nanosecond, picosecond, and femtosecond units to increase the roughness of the implant surface, thereby preventing spatter of the implant surface and ablation efficiency. raised the

3) Depth distribution of the groove formed by checking the depth of the groove, determining whether to irradiate the third laser or not, or adjusting the irradiation time, beam size, pulse duration, pulse energy, etc. of the third laser to be irradiated At the same time to make it more diversified,

4) By spraying the surface treatment agent on the implant surface through the treatment agent spraying step and then proceeding with the second laser irradiation step, there is an effect of enabling the change of the irradiation angle through refraction without a separate adjustment of the irradiation angle.

1 is a flow chart showing a surface treatment method of the present invention.
2 is a conceptual diagram illustrating irradiation angles of a first laser and a second laser according to the present invention.
3 is a cross-sectional view comparing the implant surface according to the present invention and the implant surface by a known surface treatment method.
4 is a conceptual diagram illustrating a groove depth measurement through a surface roughness meter.
5 is a conceptual diagram illustrating an example of measuring an average reference depth;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings are not drawn to scale, and like reference numbers in each drawing refer to like elements.

1 is a flowchart illustrating a surface treatment method of the present invention, and FIG. 2 is a conceptual diagram illustrating irradiation angles of a first laser and a second laser of the present invention.

1 and 2, the method for surface treatment of a dental implant by adjusting the irradiation angle of a laser of the present invention consists of a first laser irradiation step (S11) and a second laser irradiation step (S12). .

Here, the laser irradiation consists of two steps of irradiating lasers having different irradiation angles. In the present invention, the laser irradiated in the first laser irradiation step (S11) is a 'first laser' and a second laser irradiation step (S12). The laser irradiated from the 'second laser' is called.

At this time, the first laser may be irradiated to the implant fixture surface once, but the first laser may be irradiated to the implant fixture surface several times, and the second laser may also be irradiated once to the implant fixture surface. It is also possible to irradiate the fixture surface multiple times.

In addition, since the first laser and the second laser have different irradiation angles, when the first laser is repeatedly irradiated, the first laser may be a laser group of different energy having a first irradiation angle. Of course, the second laser may also be a laser group of different energies having a second irradiation angle.

As shown in FIG. 2, the irradiation angle is an angle based on a normal line drawn from the fixture surface, and is characterized in that the second irradiation angle is larger than the first irradiation angle, so that the first laser is closer to the fixture It is irradiated at an angle, and the second laser may be irradiated at an angle closer to perpendicular to the fixture. Most preferably, in the case of the first laser, since it has the same irradiation angle as the normal drawn on the fixture surface, in the case of the first irradiation angle, it may be preferably 0°, and the second irradiation angle has an irradiation angle different from the first irradiation angle. can In this case, the irradiation angle is an angle formed between the normal and the laser, and does not have a negative value but only a positive value. That is, only the magnitude of the angle is calculated.

In addition, the first laser and the second laser are characterized in that each has a first irradiation angle and a second irradiation angle, in this case, the laser intensity control method of the first laser and the second laser is not limited. In this case, in order to more preferably form a discontinuous and amorphous profile, that is, a patterned fixture surface, the first laser and the second laser may be irradiated with different irradiation angles and different intensities.

Furthermore, the first laser is irradiated to the surface of the implant at a first irradiation angle, and after the first laser is irradiated, the second laser is irradiated to the surface of the implant at a second irradiation angle greater than the first irradiation angle, and the second laser is irradiated to the surface of the implant. After being irradiated, a third laser having a larger third irradiation angle than the second laser may be irradiated, and a plurality of lasers having various irradiation angles may be sequentially irradiated, so there is no limit to the number of types of irradiated lasers. does not

Here, the laser intensity may vary depending on the method of continuously/discontinuously irradiating the first and second lasers, for example, if the first and second lasers are CW (continuous wave) lasers continuously irradiating light, the 2 The unit of energy is expressed in W (watt), which is Joule per second. In other words, for the laser irradiation method of the present invention, an appropriate method may be selected from continuous or discontinuous irradiation method according to the irradiation environment.

In addition, when the first and second lasers are pulse lasers having a short duration of light, the intensity of the first and second lasers is 'pulse energy', which is the intensity per pulse, and 'pulse duration', which is the duration of the laser. And it can be expressed through the 'pulse repetition rate', which is the number of times the light is irradiated per second, and the diameter of the cross-sectional area of the laser irradiated to the fixture, that is, the beam size, which is the diameter of the laser.

Furthermore, when the beam size and pulse energy appear as described above, the area of the laser can be calculated through the diameter of the laser, and pulse energy per area can be calculated based on this, and the average output per unit area is multiplied by the pulse repetition frequency. This may indicate the intensity of the first laser and the second laser.

At this time, in the present invention, the first and second lasers are irradiated to the implant with pulsed lasers (nanosecond laser and femtosecond laser) having a pulse width of nanoseconds, picoseconds, and even femtoseconds to increase the roughness of the implant surface. , may be defined as the intensity of the first and second lasers as the average output per unit area described above. More details will be described later.

3 is a cross-sectional view comparing the implant surface by the known surface treatment method and the implant surface according to the present invention.

3, since the first laser and the second laser have different irradiation angles, that is, the first and second irradiation angles are irradiated to the surface of the implant fixture, the first laser and the second laser having different directions The grooves formed on the surface of the fixture by the second laser, that is, the pattern of the grooves may be more irregular, and the effect of increasing the surface area and increasing the surface friction coefficient may be further maximized.

Here, the term “groove” refers to the unevenness formed on the surface of the implant, which is used in the same sense as a crater and a groove.

In the case of (a) of FIG. 3, the surface of the implant fixture irradiated with a laser in only one direction as in a known method. In this case, a difference in the depth of the groove may exist, but the direction in which the groove is formed is constant, so that the pattern of the groove itself is It only exists in a certain direction. Accordingly, patterns with different depths appear in the same direction, indicating uniformity in which the patterns appear only in a specific direction.

In this case, when an impact is applied in a specific direction while the implant is placed, the fixation force of the implant can be secured. Fixing force cannot be guaranteed. In other words, the groove pattern in the implant of FIG. 3(a) has a disadvantage in that it takes uniformity highlighted in a specific direction by the laser surface treatment method irradiated in one step.

However, in the case of (b) of FIG. 3 , as grooves are formed on the laser surface in different directions through the first and second lasers, a plurality of lasers having different laser intensity and direction are sequentially irradiated to the implant surface, so that the implant surface is damaged. In addition to making the shape of the formed groove, that is, the groove more three-dimensional, a more random pattern of grooves is displayed.

In other words, the first and second lasers with different directions, preferably different directions and different energies, dig into the implant surface to form a groove, and since there is a difference in the degree of forming the groove, the direction of forming the groove is also different, 1, 2 In the case of the grooves generated through the laser irradiation steps (S11 and 12), the depth and direction may not be uniform.

In summary, the laser surface treatment method of the present invention can prepare for the impact in all directions applied to the implant placed in the alveolar bone, so it provides a characteristic that can strengthen the fixing force of the implant.

Furthermore, as an embodiment of the first laser and the second laser, the first laser and the second laser may be irradiated as discontinuous pulse energy having different laser intensities, that is, laser energy. to do it

First, in the case of the first laser, in a state with a first irradiation angle, a beam size of 5 to 20 μm, a pulse duration of 5 to 20 ns (nano second), and a pulse of 15 to 50 kHz It may have a repetition rate and a pulse energy of 50 to 150 mJ. Therefore, in the case of such a first laser, when the pulse energy per area is calculated, the fluence may be 0.16 to 7.64.

In the case of the second laser, as having a second irradiation angle greater than the first irradiation angle, 1 to with a beam size of 0.5 to 5 μm and a pulse duration of 10 to 50 ps (pico second) A pulse energy of 10 mJ may be irradiated with a pulse repetition rate of 15 to 50 kHz. Therefore, in the case of such a second laser, if the pulse energy per area is calculated, it may have a fluence of 0.05 to 50.96.

In the case of the first laser and the second laser, the pulse repetition frequency is the same, but the beam size, the pulse duration, and the pulse energy have different characteristics. Therefore, it goes without saying that the second energy can have a larger value in the value of fluence, and in the case of the first laser, it has a pulse duration in the nanosecond band, and in the case of the second laser, it has a pulse duration in the picosecond band. As a result, there is a difference of about 10 ^-3 in the difference in pulse duration.

Therefore, the output per pulse of the second energy can appear much larger, so that the surface roughness of the implant can be increased by laser treatment of the implant surface more strongly. In addition, in the case of the second energy having the picosecond pulse laser, the output per pulse is stronger than the first laser having the nanosecond pulse laser, and furthermore, as strong energy is applied only for a faster time, the energy used for ablation is It is possible to reduce the spatter phenomenon that spreads to the

Here, the expression ablation means to scrape away the surface of the fixture touched by the laser through laser processing, so laser processing and ablation are the same expression.

Furthermore, after the second laser irradiation step, a third laser having a different irradiation angle and output per pulse from the first laser and the second laser may be sequentially further irradiated.

The third laser used in this third laser irradiation step is a pulse energy of 0.1 to 5 mJ having a beam size of 0.5 to 2 μm and a pulse duration of 5 to 30 fs (femto second). It may be irradiated with a pulse repetition frequency (repetition rate) of 15 to 50 kHz to have a third irradiation angle having a second irradiation angle greater than the second irradiation angle.

Therefore, in the case of the third laser, it has a pulse duration in femtoseconds in a state with a larger irradiation angle than the first and second irradiation angles, which are the irradiation angles of the first and second lasers. Since it has a larger irradiation angle than the first and second irradiation angles in the state of having an output, it is possible to sequentially ablate the implant surface with a plurality of lasers with different directions and output per pulse, resulting in grooves on the implant surface. ) can be more diversified in depth and direction distribution. Furthermore, since the third laser has a pulse duration in the femtosecond unit, it is possible to further minimize the above-described sputtering phenomenon.

In addition, the aforementioned 1,2,3 lasers may be lasers having a wavelength of 1000 to 1100 nm and a Beam Quality Factor (M²) of 1.1 to 1.5. Such a laser may more preferably exhibit a wavelength of 1046 nm and a beam quality factor of 1.3, which may most preferably be an Nd:YAG laser.

4 is a conceptual diagram illustrating a groove depth measurement through a surface roughness meter.

As shown in FIG. 4 , for the implants of Examples and Control Examples to be described later, the depth of the groove created on the implant surface is measured through a surface roughness meter, and the roughness of the implant is compared.

<Example 1>

Implants made of titanium-aluminum-vanadium (Ti-6Al-4V) alloy were irradiated with a 10 ns nanosecond laser as an Nd:YAG light source with an irradiation angle of 0°, pulse energy of 100 mJ, beam size of 10 μm, and pulse repetition frequency of 30 kHz. The first laser was irradiated.

Then, a picosecond laser of 30 ps was secondarily irradiated with an Nd:YAG light source at an irradiation angle of 15°, a pulse energy of 5 mJ, a beam size of 1 μm, and 30 kHz. (Second laser irradiation)

At this time, the implant surface roughness was ^{measured for an area of 1 mm 2} , and the depth of the crater moved along the implant surface as shown in FIG. 3 , and it was possible to measure the depth of the groove in μm through the time it takes to irradiate and reflect light waves. It was measured through a non-contact surface roughness measuring device of the light wave irradiation method.

In addition, the number of each groove depth was measured by obliquely irradiating the implant surface with indirect light and then measuring the number of regions where the RGB values of the shaded by the indirect light differed on a pixel basis of 5㎛*5㎛.

In addition, the surface friction coefficient of the implant was measured using a known friction force measuring device (for example, HEIDEN's friction force measuring instrument). The surface friction coefficient for the maximum static friction force, which is the generated friction force, was measured.

<Example 2>

Implants made of titanium-aluminum-vanadium (Ti-6Al-4V) alloy were irradiated with a 10 ns nanosecond laser as an Nd:YAG light source with an irradiation angle of 0°, pulse energy of 100 mJ, beam size of 10 μm, and pulse repetition frequency of 30 kHz. The first laser was irradiated.

Then, a picosecond laser of 30 ps was secondarily irradiated with an Nd:YAG light source at an irradiation angle of 15°, a pulse energy of 5 mJ, a beam size of 1 μm, and 30 kHz. (Second laser irradiation)

Finally, a femtosecond laser of 20 fs was irradiated three times with an Nd:YAG light source at an irradiation angle of 30°, pulse energy of 1 mJ, beam size of 1 μm, and 30 kHz. (3rd laser irradiation)

Therefore, it can be said that the surface treatment of Example 2 is sequentially further irradiated with a third laser made of a femtosecond laser to the surface treatment of Example 1.

<Control Example 1>

Implants made of titanium-aluminum-vanadium (Ti-6Al-4V) alloy were irradiated with a 10 ns nanosecond laser as an Nd:YAG light source with an irradiation angle of 0°, pulse energy of 100 mJ, beam size of 10 μm, and pulse repetition frequency of 30 kHz. The first laser was irradiated.

Then, a picosecond laser of 30 ps was secondarily irradiated with an Nd:YAG light source at an irradiation angle of 0°, a pulse energy of 5 mJ, a beam size of 1 μm, and 30 kHz. (Second laser irradiation)

The surface treatment of Control Example 1 looked the same as the surface treatment of Example 1, but the first laser and the second laser having the same irradiation angle were sequentially irradiated.

<Control Example 2>

Implants made of titanium-aluminum-vanadium (Ti-6Al-4V) alloy were irradiated with a 10 ns nanosecond laser as an Nd:YAG light source with an irradiation angle of 0°, pulse energy of 100 mJ, beam size of 10 μm, and pulse repetition frequency of 30 kHz. It was irradiated with the first laser.

Through these four experimental examples, the maximum static friction force of the implant surface and the distribution of the depth and number of grooves for imparting roughness to the implant surface were measured according to the conditions of the laser treatment method of the implant surface.

Table 1 is a table summarizing the maximum static friction force of Examples 1 and 2 and Comparative Examples 1 and 2; surface friction coefficient Example 1 0.69 Example 2 0.71 Control Example 1 0.61 Control Example 2 0.48

As can be seen from Table 1, Examples 1 and 2 and Control Examples 1 and 2 both increased the surface friction coefficient of the known titanium-aluminum-vanadium alloy of 0.4, but Examples 1 and 2 showed a higher surface friction coefficient. .

Furthermore, through the comparative treatment of Example 1 and Control Example 1, it can be confirmed that Example 1, which gave a difference to the irradiation angle, showed a higher coefficient of surface friction compared to the Control Example, even if the surface treatment was performed in the same two steps. And, through the comparative treatment of Examples 1 and 2, the difference in the surface friction coefficient between the two-step surface treatment and the three-step surface treatment can be compared. In addition, through the comparative treatment between Control Examples 1 and 2, it was confirmed that the surface friction coefficient was increased by the two-step surface treatment.

Prior to comparison of the depth and number of grooves formed in Examples 1 and 2 and Control Examples 1 and ² , the number of grooves present in an area of 1 mm 2 of the surface-treated implant surface was measured at the height of the number as shown in Table 2 below. Levels 1 to 5 were classified and arranged accordingly.

number of grooves level 0 to 500 One 500 to 1000 pieces 2 1500 to 2500 pieces 3 2500 to 3000 pieces 4 3000+ 5

The number of grooves measured on the implant surface of Examples 1 and 2 and Control Examples 1 and 2 is summarized in Table 3 below according to the level values in Table 2.

Less than 7㎛ 7 to 14 μm 14 to 21 μm 21㎛ or more Example 1 4 4 5 4 Example 2 4 5 5 5 Control Example 1 4 3 4 4 Control Example 2 One 2 3 3

As can be seen from Table 3, when lasers of different energies were sequentially irradiated as in Examples 1 and 2 to Control Example 1, more diverse and even grooves appeared than in Comparative Example 2 when irradiated with single energy energy. can confirm.

In addition, through the comparative treatment between Examples 1 and 2, it was confirmed that Example 2, in which the three-step surface treatment was performed, showed more and more craters of various sizes than in Example 1, in which the two-step surface treatment was performed.

In addition, through the comparative treatment between Example 1 and Control Example 1, it can be confirmed that the difference in the irradiation angle even in the two-step surface treatment is more helpful in increasing the size distribution and number of grooves.

In summary, the laser surface treatment method of the present invention sequentially irradiates a laser at different irradiation angles, thereby treating the surface of the implant through lasers having different irradiation angles and different energies. It provides a characteristic that prevents the osseointegration between the implant and the alveolar bone from being easily unraveled even when subjected to shocks in various directions by giving it roughness.

In addition, the surface treatment method of the present invention is characterized in that craters, ie, grooves, are formed on the surface of the implant to have various depths and directions through the first and second lasers having different irradiation angles and energies. A function may be added to measure the depth of the formed groove, and based on it, to enable additional groove formation. To this end, after the second laser irradiation step (S12), a depth measurement step and an additional irradiation step may be further included.

The depth measurement step is a step of measuring the depth of the groove through a surface roughness meter or the like as in the example of FIG. 4 described above, and is performed by ablation on the implant surface through the first and second laser irradiation steps S11 and S12. This is the process of measuring the depth of the generated groove.

As in the above-described embodiment, this is through a non-contact surface roughness measuring device of the light wave irradiation method that can measure the groove depth in μm unit through the time when light waves are irradiated and reflected and returned while moving on the implant surface, as in the above-described embodiment. Since it can be measured, a detailed description will be omitted.

The additional irradiation step is a process of additionally irradiating a third laser having a lower pulse energy and a shorter pulse duration than the first and second lasers as described above according to the height of the groove depth measured in the depth measurement step. In this case, the third laser is characterized in that the pulse energy is low and the pulse duration is short.

At this time, preferably, as described above, a pulse energy of 0.1 to 5 mJ and a pulse energy of 15 to 50 kHz having a beam size of 0.5 to 2 μm and a pulse duration of 5 to 30 fs (femto second) The third laser may be irradiated at a repetition rate, and in this case, the third laser may preferably have a third irradiation angle greater than the first and second irradiation angles.

Therefore, through such a configuration, the depth of the groove can be checked, and accordingly, whether to irradiate the third laser or not, or by adjusting the irradiation time, beam size, pulse duration, pulse energy, etc. of the third laser can be irradiated. It becomes possible to further diversify the distribution of the depth of the groove.

Here, the depth measurement step may further calculate the average reference depth as well as the individual depth of the groove. For this purpose, the depth measurement step may include a first depth determination step, a second depth determination step, and a reference depth calculation step. have.

In this case, the first depth determination step is a step of determining a first depth, which is the depth of the deepest groove among the plurality of generated grooves, and the second depth is the second deepest depth after the first depth among the plurality of grooves. This is the step of grasping the second depth. These first and second depths may be referred to as values for the deepest depth, that is, the peak point among the depths of the generated grooves.

5 is a conceptual diagram illustrating an example of measuring an average reference depth.

Referring to FIG. 5 , the step of calculating the reference depth is a step of calculating the average reference depth for the groove based on the identified first and second depths. In this case, the average reference depth is the difference between the average depth and the arithmetic mean of the first depth (1st peak depth) and the second depth (2nd peak depth) as shown in FIG. 5 , the average reference depth (MSD) can be have. In this case, the average depth is a value obtained by arithmetic average of the depths of all grooves formed on the implant surface.

In this case, preferably, the average reference depth may be calculated through Equation 1 below.

Equation 1.

은 제 1 깊이,

는 제 2 깊이,

은 홀의 평균 깊이를 의미한다. 이때 깊이의 단위는 바람직하게는 마이크로미터(㎛)일 수 있다.where MSD is the mean reference depth,

is the first depth,

is the second depth,

is the average depth of the hole. In this case, the unit of the depth may be preferably micrometers (㎛).

이 0.87㎛ ,

는 0.82㎛이고

이 0.38㎛인 경우, 이를 수학식 1에 대입하면

과 같이 평균 기준 깊이가 산출될 수 있다.For example,

0.87 μm,

is 0.82 μm

If is 0.38㎛, substituting it in Equation 1

The average reference depth may be calculated as follows.

As the MSD value calculated in this way is larger, it means that a crater, that is, a groove is formed deeply on the implant surface. Preferably, the third laser, which can be called a femtosecond laser, has a smaller MSD value, that is, the average reference depth is lower. The third laser having a stronger output per pulse is irradiated by controlling the recording pulse energy and the pulse duration, and the third laser having a slightly lower output per pulse is irradiated as the average reference depth is higher.

That is, depending on the height of the average reference depth, the implant is irradiated with a third laser with a lower pulse energy and shorter pulse duration than the first and second lasers, but the pulse energy and pulse duration of the third laser can be differentially adjusted to irradiate the implant. will become

Through this, the depth of the groove formed by checking the depth of the groove, determining whether to irradiate the third laser or not, or adjusting the irradiation time, beam size, pulse duration, pulse energy, etc. of the third laser to allow differential irradiation Not only can the distribution be more diversified, but it has the effect of controlling the depth of the groove itself.

Furthermore, although the irradiation angle itself may be adjusted to make the irradiation angles of the first laser and the second laser different from each other, the irradiation pause period of the differentially irradiated laser, that is, the time between the first laser and the second laser irradiation step, is applied to the implant surface. It is also possible to change the irradiation angle by performing a coating treatment so that the laser is refracted as the medium is changed.

Therefore, between the first laser irradiation step (S11) and the second laser irradiation step (S12) for this purpose, a treatment agent spraying step may be included. Through this, the first laser irradiation step (S11) is finished, and by changing the medium of the implant surface through a method of spraying the surface treatment agent to the implant surface, the second laser having straightness is refracted by the surface treatment agent to change the irradiation angle. to make it possible

Therefore, after the first laser irradiation step (S11) is completed and the surface treatment agent is sprayed on the implant surface through the treatment agent spraying step, the second laser irradiation step (S12) is performed, so that the laser is refracted by the surface treatment agent and the second laser It is possible to make the irradiation angle of the first laser different from that of the first laser.

At this time, in order to increase the refractive effect according to the change of the medium, the surface treatment agent is characterized in that Tara gum (Tara gum) is included as an active ingredient.

Tara gum is a food additive for increasing the adhesion and viscosity of food, enhancing emulsion stability, and improving the physical and tactile properties of food. It is used as a thickener and stabilizer in food. In particular, it can be dissolved in cold water, and the aqueous solution is known to have excellent acid and salt resistance.

As such, by spraying the surface treatment agent containing tara gum on the implant surface, the surface treatment agent can be easily adhered to the implant surface, as well as the viscosity of the medium itself increases, so that the second laser is refracted when irradiated with the second laser, so that the first It has a different irradiation angle than the laser. Accordingly, the second laser irradiation angle is different from the first laser irradiation angle even if a separate irradiation angle adjustment is not performed when the second laser is irradiated.

In addition, when the treatment agent spraying step is included as described above, a washing and drying step is further included after the second laser irradiation step (S12), and the surface of the implant on which laser irradiation is completed is repeatedly washed with a cleaning solution containing ethanol and purified water and dried to obtain a surface treatment agent Wash and remove the residue of

At this time, there is no limitation on the number and method of washing, but preferably, the surface of the implant is repeatedly washed with a washing solution containing 40 to 60 parts by weight of ethanol and 40 to 60 parts by weight of purified water, but by adjusting the pressure to spray the washing solution to the implant surface. Repeat washing and drying to avoid any residue of surface treatment agent.

In addition, the surface treatment agent induces refraction of the second laser to perform an additional function of increasing the irradiation efficiency of the second laser as well as the function of differentiating the irradiation angles of the first laser and the second laser without separately adjusting the irradiation angle. The surface treatment agent may be prepared through the steps of preparing the first mixed solution (S21), preparing the second mixed solution (S22), and completing the surface treating agent (S23).

(S21) No. 1 Step of preparing the mixed solution

First, 75 to 93 parts by weight of distilled water, 5 to 20 parts by weight of tara gum, and 2 to 10 parts by weight of 1-hydroxycyclohexyl phenyl ketone are mixed to prepare a first mixed solution.

Distilled water refers to water purified by cooling water vapor generated when water is heated, and is included as a solvent of the first mixed solution. In addition, the above-described tara gum is added to increase the viscosity of the surface treatment agent and refract the second laser to have the second irradiation angle different from the first irradiation angle.

1-Hydroxycyclohexylphenyl ketone is a material that can increase the ablation efficiency by accelerating the vibration of particles located on the implant surface by increasing the energy transfer efficiency according to the second laser irradiation.

(S22) 2nd Step of preparing a mixed solution

Next, 90 to 97 parts by weight of the first mixed solution, 1 to 8 parts by weight of diphenylsilandiol, and 1 to 5 parts by weight of aluminum titanate are mixed to prepare a second mixed solution.

The diphenylsilanediol added here is added to prevent a decrease in laser transmittance due to the viscosity increased by tara gum and to increase light transmittance. It is added to prevent the coating film formed on the implant surface from being destroyed through the treatment agent.

(S23) surface treatment agent step to complete

Finally, 90 to 95 parts by weight of the second liquid mixture, 1 to 5 parts by weight of maltodextrin, and 1 to 8 parts by weight of an antimicrobial treatment agent including Cetrimonium Chloride are mixed to complete the surface treatment agent .

Maltodextrin added here is a generic term for low molecular weight dextrins with a lower degree of polymerization than acrodextrin among dextrins produced by decomposing starch with dilute acid or amylase until it becomes maltose. It is added to enhance the refractive effect of the second laser.

In addition, the antibacterial additive contains cetrimonium chloride as an active ingredient, which has a sterilizing and disinfecting function, along with the role of a surfactant, adding sterilization, disinfection, and antibacterial functions to the implant surface. At the same time, it serves to increase the miscibility of various components included in the surface treatment agent.

As the thus-prepared surface treatment agent is sprayed on the implant surface, the second laser is refracted by the high viscosity of the surface treatment agent when irradiated with the second laser, making it possible to give a difference in the irradiation angle, as well as high thermal shock resistance. When laser irradiation, the surface treatment agent prevents the destruction of the coating film on the implant surface, and accelerates the vibration of particles located on the implant surface to increase the ablation efficiency.

In addition, the antimicrobial treatment agent may further include an additional composition in addition to cetrimonium chloride, and the antimicrobial treatment agent comprises the steps of preparing the first mixture (S31), preparing the second mixture (S32), and completing the antimicrobial treatment ( It can be manufactured through S33).

(S31) step of preparing the first mixture

A first mixture is prepared by mixing 65 to 80 parts by weight of propyl alcohol, 15 to 25 parts by weight of cetrimonium chloride, and 5 to 10 parts by weight of tetraethylammonium hydroxide.

Here, propyl alcohol is a material that enhances the sterilization and disinfection effect to add antibacterial properties and at the same time serves as a solvent for the primary mixed solution, and cetrimonium chloride is a material having a sterilizing and disinfecting effect along with the surfactant ability as described above.

Tetraethylammonium hydroxide is a material with excellent repulsion, and is added to maintain a mixed phase by preventing various substances included in the antimicrobial treatment agent and the surface treatment agent from sinking without mixing through a unique repulsion force.

(S32) step of preparing a secondary mixture

Subsequently, 85 to 97 parts by weight of the first mixture, 1 to 10 parts by weight of barium hydroxide, and 1-(2-hydroethyl)-2-pyrrolidone (1-(2-hydroethyl)-2-pyrrolidone ) 1 to 5 parts by weight are mixed to prepare a second liquid mixture.

Barium hydroxide is a material that improves heat resistance and is added to prevent the surface treatment agent from being destroyed by heat when it is included in the antimicrobial treatment agent and mixed with the surface treatment agent.

In the case of 1-(2-hydroethyl)-2-pyrrolidone, 1-(2-hydroethyl)-2 is added to assist the function of 1-hydroxycyclohexylphenylketone in the above-mentioned surface treatment agent. - The effect of enhancing particle vibration by adding pyrrolidone can be further increased.

(S33) antibacterial treatment agent step to complete

Finally, 92 to 98 parts by weight of the secondary mixture, 1 to 5 parts by weight of zinc oxide, and 1 to 3 parts by weight of a phosphite complex are mixed to complete an antimicrobial treatment agent.

Zinc oxide can help to preserve functional stability by preventing the deterioration of the implant fixture by laser by performing a role of preventing phenomena such as material deformation and functional deterioration.

In addition, in the case of the phosphite complex, it may help to increase the storage stability of the antimicrobial treatment agent and prevent deterioration of the function of the implant fixture by performing a role of assisting the function of the zinc oxide described above.

Therefore, according to the addition of the antimicrobial treatment agent, it is possible to prevent deterioration of the function of the implant fixture, to add sterilization, disinfection, and antibacterial effects, and at the same time to increase the miscibility of the surface treatment agent including the antibacterial treatment agent.

As described so far, the configuration and action of the surface treatment method of the dental implant through the adjustment of the irradiation angle of the laser according to the present invention is expressed in the above description and drawings, but this is only an example and the idea of the present invention is not It is not limited to the description and drawings, and various changes and modifications are possible without departing from the technical spirit of the present invention.

S11: first laser irradiation step
S12: second laser irradiation step

Claims (10)

A method for surface treatment of a dental implant by controlling the irradiation angle of a laser, comprising:
A first laser irradiation step of irradiating a first laser having a first irradiation angle to the implant;
Spraying the surface treatment agent containing Tara gum (Tara gum) on the surface of the implant, treatment agent spraying step;
a second laser irradiation step of irradiating a second laser having a second irradiation angle greater than the first irradiation angle to the implant;
Surface treatment method comprising a; washing and drying step of washing and drying the implant with a washing solution containing ethanol and purified water. The method of claim 1,
The first laser irradiation step,
A pulse energy of 50 to 150 mJ with a beam size of 5 to 20 μm and a pulse duration of 5 to 20 ns (nano second) pulses of 15 to 50 kHz to have the first irradiation angle Irradiated with a repetition rate,
The second laser irradiation step,
A pulse of 15 to 50 kHz to have the second irradiation angle with a pulse energy of 1 to 10 mJ with a beam size of 0.5 to 5 μm and a pulse duration of 10 to 50 ps (pico second) A method for surface treatment, characterized in that irradiation is performed at a repetition rate. 3. The method of claim 2,
After the second laser irradiation step,
A pulse energy of 0.1 to 5 mJ with a beam size of 0.5 to 2 μm and a pulse duration of 5 to 30 fs (femto second) having a second irradiation angle greater than the second irradiation angle A third laser irradiation step of irradiating with a pulse repetition frequency (repetition rate) of 15 to 50 kHz so as to have a third irradiation angle; Surface treatment method characterized in that it is included. 4. The method of claim 3,
The first, second, and third lasers are
A wavelength of 1000 to 1100 nm, and a Beam Quality Factor (M²) of 1.1 to 1.5, characterized in that the surface treatment method. The method of claim 1,
After the second laser irradiation step,
Depth measuring step of measuring the depth of the groove (groove) generated in the surface of the implant; and,
According to the height of the depth of the groove, an additional irradiation step of additionally irradiating a third laser having a lower pulse energy and shorter pulse duration than the first and second lasers to the implant; . 6. The method of claim 5,
The depth measurement step,
A first depth determination step of grasping a first depth that is the depth of the deepest groove among the plurality of grooves;
A second depth determination step of grasping a second depth, which is the second deepest depth among the plurality of grooves, and;
a reference depth calculation step of calculating an average reference depth for the groove based on the first depth and the second depth;
The additional investigation step is
According to the height of the average reference depth, a third laser having a lower pulse energy and a shorter pulse duration than the first and second lasers is additionally irradiated to the implant, the surface treatment method. 7. The method of claim 6,
The average reference depth is,
The surface treatment method, characterized in that calculated through the following Equation 1.
Equation 1.

(where MSD is the mean reference depth,

is the first depth,

is the second depth,

is the average depth of the hole) delete The method of claim 1,
The surface treatment agent,
Preparing a first mixed solution by mixing 75 to 93 parts by weight of distilled water, 5 to 20 parts by weight of tara gum, and 2 to 10 parts by weight of 1-hydroxycyclohexyl phenyl ketone;
preparing a second mixed solution by mixing 90 to 97 parts by weight of the first mixed solution, 1 to 8 parts by weight of diphenylsilandiol, and 1 to 5 parts by weight of aluminum titanate;
Completing the surface treatment agent by mixing 90 to 95 parts by weight of the second mixture, 1 to 5 parts by weight of maltodextrin, and 1 to 8 parts by weight of an antimicrobial treatment agent containing Cetrimonium Chloride; Characterized in that produced through, the surface treatment method. 10. The method of claim 9,
The antimicrobial treatment agent,
Preparing a first mixed solution by mixing 65 to 80 parts by weight of propyl alcohol, 15 to 25 parts by weight of cetrimonium chloride, and 5 to 10 parts by weight of tetraethylammonium hydroxide;
85 to 97 parts by weight of the first mixture, 1 to 10 parts by weight of barium hydroxide, and 1-(2-hydroethyl)-2-pyrrolidone (1-(2-hydroethyl)-2-pyrrolidone) preparing a second mixture by mixing 1 to 5 parts by weight;
Completing an antimicrobial treatment agent by mixing 92 to 98 parts by weight of the secondary mixture, 1 to 5 parts by weight of zinc oxide, and 1 to 3 parts by weight of a phosphite complex; Characterized in the surface treatment method.

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