CZ2022480A3 - An assembly to carry a denture and a method of its manufacture - Google Patents

Abstract

The assembly includes a dental implant (1), a fixation screw (2) and an abutment (3) for fixing a dental prosthesis, where the abutment (3) includes a first end (4) of the abutment, a second end (5) of the abutment opposite the first end (4) of the abutment and the cavity (6) of the abutment, wherein the cavity (6) of the abutment opens at the first and second ends (4,5) of the abutment and the first end (4) of the abutment abuts the dental implant (1), while at least part of the fixation screw (2) is located in the cavity (6) of the abutment and the fixation screw (2) is connected to the dental implant (1), wherein the cavity (6) of the abutment comprises a first side (7) of the cavity comprising the first section (8) of the cavity and a second side (9) of the cavity comprising the second section (10) of the cavity, wherein the first side (7) of the cavity is located closer to the first end (4) of the pillar than the second side (9) of the cavity and the cross-section of the first section (8) of the cavity is larger than the cross-section of the second section (10) of the cavity, while the fixing the screw (2) includes the head (11) of the fixation screw, which is located in the first side (7) of the cavity.

Description

An assembly for carrying a dental prosthetic prosthesis and a method of its production

Field of technology

The invention relates to an assembly for carrying a dental prosthetic prosthesis, which solves the problems associated with the production, assembly and implantation of the assembly, especially in connection with the release of the fixation screw from the cavity of the abutment, and also to the design of the top of the abutment, which expands the clinical use of the invention.

Current state of the art

In the current state of the art, dental prostheses are known including a dental implant fixed in the jaw bone and a hollow abutment carrying a dental prosthetic prosthesis, which are connected by means of a fixation screw, wherein the fixation screw is threaded through the hollow abutment and connected to an internal thread in the cavity of the dental implant. The design of the abutment differs according to the type of dental prosthesis. Maintaining the stiffness and strength of the assembled dental implant assembly, abutment and fixation screw is key to the long-term life of the assembly in the bone mass of the human jaw. If there is a violation of the power connection of the parts of the assembled assembly, the loose parts can cause damage to the assembly parts and the prosthetic dental prosthesis, significantly reduce the safety of using the dental prosthetic prosthesis and can lead to damage to the health of the user - the patient.

Repair of damaged parts of the installed assembly, including dental prosthetics, is possible by replacing loose defective parts or making a new dental prosthetic. If a dental implant that is integrated into the bone mass of the human jaw is damaged, surgical removal of the damaged implant is necessary, which entails health risks for the patient and economic costs on the part of the doctor and the patient.

One of the known solutions for fixing the assembly of the dental implant, abutment and fixation screw is described in document KR20090069402 A, and consists in the use of a locking insert which is inserted into the abutment from the same side as the fixation screw, the locking insert resting on the head of the fixation screw. The surface of the locking insert includes a shaped protrusion that precisely fits into the shaped hole in the head of the fixation screw, so that the elements fit tightly together and do not rotate against each other. The mentioned arrangement does not solve the possible axial displacement of the insert, and thus neither of the fixation screw.

Other methods of preventing loosening of the fixation screw consist of the use of a locking screw insert, which is inserted into the abutment from the same side as the fixation screw and rests on the head of the fixation screw, as described in document KR20170029792 A. In the solution described in document KR20090069402 A, the surface of the locking screw includes screw inserts, a shaped protrusion that fits exactly into the shaped hole in the head of the fixation screw, so that the elements fit tightly together and do not rotate against each other.

Document KR20090008785 A describes the use of a locking insert in the form of a screw, whereby the locking screw, in addition to the thread, also includes a protrusion that fits into the corresponding hole in the head of the fixing screw. The fixation screw is thus connected to the dental implant and at the same time to the abutment, but in case of failure of the screw connection of the screw insert or the locking screw, there is still a risk of displacement of the fixation screw in the direction of the longitudinal axis of the implant.

A combination of the previous solutions is described in the document KR102177377 B1, which describes the fixing of the fixation screw in the cavity of the pillar by means of an insert in the form of a locking screw, wherein both the head of the fixation screw and the head of the locking screw include an external thread that is connected to an internal thread in the cavity of the pillar. The face of the locking screw simply rests on the head of the fixation screw and its position is secured by cementation.

- 1 CZ 2022 - 480 A3

The disadvantage of all the solutions mentioned above is that in case of failure of the function of the fixing screw or the securing element, it is still possible to move the fixing screw in the pillar cavity in the direction of the longitudinal (axial) axis of the cavity, or to completely release the fixing screw from the pillar. The dental implant, abutment and fixation screw are applied separately during implantation into the jaw, which increases the risk of their damage, loss or inhalation by the patient during handling and installation of the parts, as well as the overall difficulty of completing the assembly with a dental prosthetic replacement. Another disadvantage is that the diameter of the abutment cavity at its mouth, which is normally intended for the insertion of the fixation screw and to which the dental prosthesis adjoins, is as large as or larger than the diameter of the head of the insertion fixation screw, and the abutment has a thin bearing wall at this point , which does not allow the use of these pillars for all prosthetic indications. These are, for example, dental prosthetic restorations requiring small dimensions of the top part of the abutment on the contact surface with the dental prosthetic restoration, which are intended for the frontal section of the dentition (i.e. in the anatomy of the incisor and canine). The large diameter of the cavity in the top part of the abutment is also disadvantageous for dental prosthetic replacements of the distal part of the dentition (molars and premolars), on which the greatest pressure is exerted from chewing forces, because a larger volume of high-strength material cannot be applied to the thin wall of the abutment in its top part, which is necessary for the sufficient strength of this dental prosthetic replacement - the crown.

The essence of the invention

The above deficiencies are overcome by an assembly for carrying a dental prosthetic prosthesis comprising a dental implant, a fixation screw and an abutment for fixing a dental prosthetic prosthesis, wherein the abutment includes a first end of the abutment, a second end of the abutment opposite the first end of the abutment, and a cavity of the abutment, wherein the cavity of the abutment opens at the first and second the ends of the abutment and the first end of the abutment abuts the dental implant, wherein at least part of the fixation screw is located in the cavity of the abutment and the fixation screw is connected to the dental implant. The pillar cavity further includes a first cavity side comprising a first cavity section and a second cavity side comprising a second cavity section, wherein the first cavity side is located closer to the first end of the pillar than the second cavity side and the cross section of the first cavity section is greater than the cross section of the second cavity section, wherein the fixing screw includes a fixation screw head located in the first side of the cavity.

The dental implant is integrated in the bone mass of the jaw, while the abutment for supporting the dental prosthesis is attached to the dental implant with a fixation screw. The head of the fixation screw is placed in the first side of the abutment cavity, i.e. closer to the dental implant, where the first section of the cavity is also located. On the other side of the cavity, closer to the other end of the pillar, there is a second section of the cavity, whereby the section of the cavity is understood as a place or point on the longitudinal axis of the cavity where the cavity has a constant cross-section. Since the cross-section of the second cavity section is smaller than the cross-section of the first cavity section, the cavity includes a constriction closer to the second end of the pillar. This narrowing of the abutment cavity in the other side of the cavity ensures the integration of the fixation screw in the abutment cavity, which eliminates axial displacement of the fixation screw relative to the abutment. Before installing the abutment to the dental implant, the fixation screw is already integrated into the cavity of the abutment and cannot be removed from the abutment, which eliminates the possibility of losing the fixation screw and increases safety when handling the abutment in the patient's mouth. The narrowing of the abutment cavity on the other side of the abutment also makes it possible to reduce the dimensions of the abutment at the other end of the abutment, i.e. at the top outer part of the abutment to which the crown of the dental prosthesis adjoins. The reduced dimensions of the outer top part of the abutment allow the abutment to be used for prosthetic indications of teeth that have a subtle shape topology (incisors, canines). Another advantage of the narrowed cavity closer to the top part of the abutment is the possibility of increasing the thickness of the abutment wall and thus increasing the strength of the abutment at the point of contact with the crown. Another advantage of the reduced external dimensions of the top part of the abutment is the possibility of using a larger volume of high-strength material, from which the crown - dental prosthetic replacement, is made, for particularly stressed teeth (molar, premolar, molar). The assembly for carrying a dental prosthetic prosthesis with an abutment and fixation screw according to the invention is a solution to increase the safety and functionality of the installation and use of a number of different types of dental prosthesis during dental implantological treatment.

In an advantageous embodiment of the assembly for carrying a dental prosthetic replacement according to the invention, the diameter of the head of the fixation screw is greater than the diameter of the second section of the cavity. This design further stabilizes the position

- 2 CZ 2022 - 480 A3 of the fixation screw, especially the head of the fixation screw in the cavity, and completely prevents the extraction of the fixation screw from the pillar cavity. If the head of the fixation screw or the second section of the cavity has an irregular (non-circular) cross-section, this definition means that the largest radial dimension of the head of the fixation screw is greater than the smallest radial dimension of the cross-section of the second section of the cavity.

In an advantageous embodiment of the assembly for carrying a dental prosthetic prosthesis according to the invention, the cross-section of the abutment cavity in planes perpendicular to the longitudinal axis of the abutment cavity is circular, while the ratio of the diameter of the first section of the cavity D1 and the diameter of the second section of the cavity D2 is greater than 1, more preferably 1.5 to 1, 65. The stated range is advantageous with regard to the shaping and nominal dimensions of fixation screws standardly used for dental prosthetic restorations.

In a preferred embodiment, the assembly for carrying a dental prosthesis further includes a safety screw including a safety screw pin, wherein the head of the fixation screw includes a manipulation hole and the safety screw pin is in contact with the bottom of the manipulation hole. The safety screw is inserted into the other side of the pillar cavity and serves as a securing element that fixes the mutual position of the fixation screw and the pillar. The security screw pin means the face of the security screw, while the face of the security screw is embedded in the manipulation hole in the head of the fixation screw and rests directly on its bottom. By embedding the pin of the safety screw all the way to the bottom of the handling hole, forceful contact and better mutual cohesion of the fixation screw and safety screw is achieved. The safety screw helps prevent axial displacement of the fixation screw.

In an advantageous embodiment of the assembly for carrying a dental prosthetic prosthesis, the other side of the cavity includes the internal thread of the abutment, while the safety screw includes an external thread corresponding to the internal thread of the abutment. After tightening the safety screw in the pillar cavity, the external thread of the safety screw is in firm contact with the internal thread of the pillar, while the creation of the internal thread of the pillar in the second part of the cavity precisely defines the position of the external thread of the safety screw after it is tightened.

The manufacturing method of the assembly for carrying a dental prosthetic prosthesis according to the invention consists in the fact that the abutment is in its initial state a semi-finished product including a cavity of uniform size, and that it includes the step of shaping the abutment around at least part of the fixation screw and the subsequent step of connecting the fixation screw to the dental implant. In the first step of production, the starting (work-in-progress) semi-finished pillar is used, in which an open internal cavity of uniform size is made, into which the fixation screw is inserted, so that the head of the fixation screw is in the first side of the cavity of the pillar and the stem of the fixation screw protrudes from the first end of the pillar . In the next step, the top part of the pillar is shaped, in which a second section of the cavity is created, i.e. a part of the cavity above the head of the fixing screw smaller than the original size of the inner cavity for inserting the head of the fixing screw. The mentioned procedure ensures the integration of the fixation screw in the abutment cavity, in particular the placement of the fixation screw head in the first section of the abutment cavity, while the fixation screw and the abutment are subsequently securely connected to the dental implant without the risk of the fixation screw falling out of the abutment.

The method of manufacturing the assembly for supporting a dental prosthetic prosthesis advantageously includes the step of shaping the abutment by forming and machining technology. The advantage of forming technology is the increase in strength of the pillar, which has increased resistance to high-cycle stress.

The method of manufacturing the assembly for carrying a dental prosthetic replacement after the step of connecting the fixation screw with the dental implant further advantageously includes the step of inserting and tightening the safety screw against the fixation screw. The insertion of the safety screw acts as an additional locking method of securing the position of the fixation screw relative to the abutment, with the screw connection increasing the cohesion of the safety screw and the abutment compared to simply inserted locking inserts.

In an advantageous embodiment of the method of manufacturing the assembly for carrying a dental prosthetic prosthesis, the internal thread of the abutment is made by chip machining or cold volume forming. By making the internal thread by volume forming, it is possible to produce an internal thread whose smallest diameter is smaller

- 3 CZ 2022 - 480 A3 than the diameter of the original cavity with a smooth wall in which the internal thread is formed. Thus, the diameter of the cavity in the place of the internal thread can be narrowed by cold forming.

Clarification of drawings

The essence of the invention is further clarified by examples of its implementation, which are described using the attached drawings, where:

Giant. 1 shows a longitudinal section of an assembled dental prosthesis bearing assembly including a dental implant, an abutment, a fixation screw and a safety screw.

Giant. 2 shows a top axonometric perspective view of the dental prosthesis bearing assembly.

Giant. 3 Shows a view of the pillar from the upper axonometric perspective.

Giant. 4 Shows a longitudinal section of a pillar.

Giant. 5 shows a side view of the pillar.

Giant. 6 Shows a view of the fixation screw from a top axonometric perspective.

Giant. 7 Shows a side view of the fixation screw.

Giant. 8 Shows a longitudinal section of the fixation screw.

Giant. 9 shows a side view of the safety screw.

Giant. 10 shows a side view of the safety screw from a top axonometric perspective.

Examples of implementation of the invention

The invention will be further explained by examples of implementation with reference to the respective drawings. One example of implementation is the dental prosthetic assembly shown in FIG. 1 to 8.

The assembled assembly for carrying the dental prosthesis shown in Fig. 1 and 2 includes a dental implant 1, an abutment 3, a fixation screw 2 and a safety screw 13. By dental implant 1 is meant a surgical dental implant 1, which is firmly integrated in the bone mass of the human jaw during dental implantological treatment, and includes an internal opening 20 of the dental implant with a thread into which a hollow abutment 3 with an integrated fixation screw 2 is inserted. A fixation screw 2 is used to connect the dental implant 1 and the inserted abutment 3, which is shown in Fig. 1 and further Fig. 6 to 8. Fixation screw 2 includes a fixation screw head 11 with a manipulation hole 15, a fixation screw shaft 18 with a smooth surface adjacent to the fixation screw head 11 and an end thread 19 of the fixation screw, the head 11 and the fixation screw shaft 18 being located in the cavity 6 pillars and the end thread 19 of the fixation screw is connected to the thread in the inner hole 20 of the dental implant 1. The head 11 of the fixation screw has a cylindrical outer shape and includes a manipulation hole 15, wherein the manipulation hole 15 has the shape of a truncated hexagonal pyramid, which is particularly evident from the view of fixing screw 2 in Fig. 6 and 8.

Pillar 3 shown in Fig. 3 to 5 includes the first end of the pillar 4, the second end of the pillar 5 opposite the first end of the pillar 4, and the cavity 6 of the pillar for the insertion of the fixation screw 2, which opens at both the first and the second end of the pillar 4.5. The first end 4 of the pillar rests against the dental implant 1, while the outer surface of the pillar 3 adjacent to the inner opening 20 of the dental implant 1 has an approximate shape

- 4 CZ 2022 - 480 A3 of a truncated cone and includes output ribs whose shape exactly corresponds to the grooves on the inner opening 20 of the dental implant. A prosthetic tooth replacement (crown) is attached to the other end of pillar 5, also in the shape of a truncated cone, while the top part of pillar 3 includes an n-edge on its outer surface. The external shaping of the pillar 3, especially the output ribs closer to the first end of the pillar 4 and the n-edges closer to the second end of the pillar 5, can be seen from Fig. 3 and 5. Dental prosthetic replacement is not the subject of the invention and is therefore not shown in the figure, in the context of the invention it is any type of replacement that can be attached to pillar 3, which can be a crown, bridge, stirrups, hybrid replacement, etc.

In the following part, the internal shaping of the pillar 3 will be described, that is, the shaping of the cavity 6 of the pillar, in which the fixing screw 2 is inserted in the assembled assembly for carrying the dental prosthetic prosthesis. In the first exemplary embodiment in Fig. 4 is a cross section of the cavity 6 of the pillar in planes perpendicular to the longitudinal axis 12 of the pillar cavity circular and the cavity 6 includes the first side 7 of the cavity adjacent to the first end 4 of the pillar and the second side 9 of the cavity adjacent to the second end 5 of the pillar, while the head 11 is placed in the first side 7 of the cavity of the fixation screw and the shank 18 of the fixation screw. The cavity 6 of the pillar includes, in the direction of the longitudinal axis 12, the cavity of 6 parts, which differ in the diameter of the cavity 6 and the shaping of the wall of the cavity 6, which is particularly evident from Fig. 4.

At the mouth of the cavity 6 at the first end 4 of the abutment, the cavity 6 first includes a cylindrical part 21 through which the stem 18 of the fixation screw is passed through in the case of a composite dental prosthesis assembly. The cylindrical part 21 of the cavity is followed by an extension 22 in the shape of a truncated rotating cone and further by the first section 8 of the cavity. The first section 8 of the cavity is then followed by the transition part 23 of the cavity, which has the form of a continuous narrowing of the diameter of the cavity 6 towards the other end of the pillar 3, while the narrowest point of the transition part 23 is the second section 10 of the cavity. The end handling part 24 of the cavity adjoins the other end 5 of the cavity and is used for inserting and fixing the safety screw 13.

The first section 8 of the cavity is, in the first exemplary embodiment, a part of the cavity 6 between two limit points on the longitudinal axis 12 of the cavity, where one limit point is at the level of the larger base of the expansion 22 of the cavity and the other limit point is at the level of the larger base of the transition part 23 of the cavity, which it narrows towards the other end of the 3 pillars. In other words, the height of the first section 8 along the longitudinal axis 12 of the cavity is equal to the distance between the larger base of the truncated cone, which forms the expansion 22 of the cavity, and between the base of the transition part 23 of the cavity. Along the entire height of the first section 8 (between these limit points), the diameter of the cavity 6 is constant and is adapted to accommodate the head 11 of the fixation screw. The first section 8 of the cavity therefore has the shape of a cylinder with a constant diameter, while the head 11 of the fixation screw is almost in contact with the wall of the first section 8 of the cavity along its entire circumference. The diameter of the first section 8 of the cavity (Di) is larger than the diameter of the head 11 of the fixing screw by the technological assembly clearance (to allow the head 11 of the fixing screw to be rotated during tightening), while the diameter of the first section 8 of the cavity (Di) is larger than the diameter of the second section 10 of the cavity (/D). In the first exemplary embodiment, the diameter of the first section 8 of the cavity (Di) is larger than the diameter of the cavity 6 in all other parts of the cavity 6. The first section 8 of the cavity is followed in the first exemplary embodiment by a transitional part 23, which has the form of a continuous narrowing of the diameter of the cavity 6 towards the second side 9 of the cavity.

The second section 10 of the cavity is connected directly to the transition part 23 of the cavity in the other side 9 of the cavity, while the second section 10 of the cavity is located closer to the other end of the cavity 5 than the first section 8 of the cavity. The diameter of the second section 10 of the cavity (D2) is smaller than the diameter of the first section 8 of the cavity (Di) and the diameter of the second section 10 of the cavity is also smaller than the diameter of the head 11 of the fixation screw. In the first exemplary embodiment, the second section 10 of the cavity is only one point on the longitudinal axis 12 of the cavity, which corresponds to the level of the narrowest point of the transition part 23 of the cavity. The narrowing of the diameter of the cavity 6 in the second section 10 compared to the first section 8 of the cavity and the head 11 of the fixation screw is a key feature of the entire assembly of the dental prosthetic replacement according to the present invention, as it prevents the movement of the head 11, and therefore the entire fixation screw 2, relative to the abutment 3, and therefore pulling out (release) of the fixation screw 2 from the pillar 3. The diameter of the head 11 of the fixation screw is thus greater than the diameter of the second section 10 of the cavity, whereby this definition means that the largest radial dimension of the head 11 of the fixation screw is greater than the smallest radial dimension of the cross section of the second section 10 of the cavity . This relationship between the dimensions of the head 11 of the fixation screw and the second section 10 is important for possible alternative designs with a non-circular cross-section

- 5 CZ 2022 - 480 A3 of the second section 10 of the cavity (possibly through the non-circular cross-section of the head 11 of the fixation screw), which are listed below in alternative embodiments of the invention.

The ratio of the diameter of the first section 8 of the cavity and the diameter of the second section 10 of the cavity (Di//D) is preferably in the range of 1.5 to 1.65, which is derived from the nominal dimensions of the fixation screws 2 used as a standard for abutment and fixation screw systems in screwed dental prosthetic replacements. Advantageous combinations of the size of the head 11 of the fixation screw (the diameter of the first section 8 of the cavity (Di)) and the diameter of the second section 10 of the cavity (D2) are shown in the following table (Tab. 1).

Tab. 1.

Di D2 Ratio Di /D2 2.15 1.4 2.15/1.4=1.53 2.2 1.4 2.2/1.4=1.57 2.3 1.4 2.3/1.4=1.63 2.6 1.6 2.6/1.6=1.64

The other side 9 of the cavity is adapted for the installation of the safety screw 13 shown in Fig. 9 and 10, which serves to additionally secure the fixation screw 2. The security screw 13 includes the head of the security screw, the external thread 17 and the pin 14, while the wall of the second section 10 of the cavity includes the internal thread 16 of the pillar adapted to connect with the external thread 17 of the security screw. If the other side 9 of the cavity includes the internal thread 16 of the pillar, the diameter of the cavity 6 at the place of the internal thread 16 of the pillar is equal to the small diameter of the safety screw 13, which is inserted into the internal thread 16 of the pillar. It is therefore the smallest possible dimension of the diameter of the cavity 6 with the internal thread 16 of the pillar, as shown in Fig. 4, while the diameter of the cavity 6 is at this point equal to the diameter of the second section 10 of the cavity D2. In the first exemplary embodiment of the invention, the pin 14 of the safety screw has a smooth surface and the diameter of the pin 14 is smaller than the diameter of the outer thread 17 of the safety screw, and after assembling the assembly, tightening the fixing screw 2 and tightening the safety screw 13, the pin 14 of the safety screw is embedded in the handling hole 15 head of the fixation screw and rests on the bottom of the manipulation hole 15. The manipulation part 24 of the cavity at the level between the internal thread 16 of the pillar and the other end 5 of the pillar, i.e. the part of the cavity 6 adjacent to the mouth of the cavity 6 on the other side 9 of the pillar.

In the following part, the method of manufacturing pillar 3 of the assembly for carrying a dental prosthetic replacement according to the present invention will be described. Pillar 3 is made by a combination of forming and machining. The pillar 3 is in the initial state of development and is a semi-finished product with an open cavity 6 of uniform dimensions, which does not include the transition part 23 of the cavity and the second section 10 of the cavity, while subsequently the fixing screw 2 is inserted into the cavity 6 of the pillar so that the head 11 of the fixing screw located in the first side of the cavity 7 in the place where the first section of the cavity 8 is supposed to be created. Subsequently, the pillar 3 is shaped around the fixation screw 2 placed in the cavity 6, especially above the head 11 of the fixation screw. At this moment, the transition part 23 of the cavity and the second section 10 of the cavity are formed, whereby the fixation screw 2 is integrated into the body of the pillar 3, while it cannot be removed from the pillar 3.

The external shaping of the pillar 3 and the cavity 6 is done by forming, during which the material of the pillar 3 is strengthened and the high-cycle strength is increased. Other possible methods of manufacturing pillar 3 according to the invention include, for example, hydroforming, casting, additive manufacturing technology and others. The use of forming is particularly advantageous for the creation of the internal thread 16 of the pillar in the second section 10 of the cavity, which proceeds as follows: first, the original simple cavity of the pillar 6 with a smooth wall is created, into which the internal thread 16 of the pillar is subsequently created. The internal thread 16 of the pillar is not formed by cutting, but by forming, whereby part of the material forming the wall of the original plain cavity 6 is moved towards the axis of rotation (longitudinal axis 12 of the cavity) during forming. The diameter of the cavity 6 of the resulting internal thread 16 of the pillar is, when using this procedure, smaller than the diameter of the original plain cavity 6 of the pillar, in the wall of which the internal thread 16 was formed.

- 6 CZ 2022 - 480 A3

The pair of abutment 3 and fixation screw 2 is subsequently connected together with the dental implant 1 by tightening the end thread 19 of the fixation screw in the thread of the dental implant 1. The step of connecting the fixation screw 2 to the dental implant 1 is followed by the step of inserting and tightening the safety screw 13 against the fixation screw 2, whereby the safety screw 13 is inserted into the cavity 6 of the pillar in the direction from the other end 5 of the pillar. The maximum tightening of the safety screw 13 in relation to the internal thread 16 of the pillar and the fixation screw 2 is given by the pin 14 of the safety screw touching the bottom of the handling hole 15 in the head 11 of the fixation screw.

In an alternative embodiment of the dental prosthesis assembly according to the present invention, the shaping of the cavity 6 of the abutment can be modified. The transition part 23 of the cavity between the first and second sections 8, 10 of the cavity, in which the narrowing of the cavity 6 occurs, can include any shaping, for example in the shape of a truncated cone or a general surface. In another embodiment of the shaping of the cavity 6, the transition part 23 can be completely omitted, while the second section 10 of the cavity directly follows the first section 8 of the cavity. At the transition level between the first and second sections 8, 10 of the cavity, the diameter of the cavity 6 changes in leaps and bounds, while the diameter of the cavity 6 between the second section 10 of the cavity and the second end 5 of the pillar can again be constant and only at the point of contact between the first section 8 and the second section 10 cavity there is a step.

In another embodiment of the invention, the second section 10 of the cavity can include a projection in the wall of the other side 9 of the cavity around the perimeter of the cavity 6, thanks to which the cross-section of the second section 10 of the cavity is smaller than the cross-section of the first section 8 of the cavity and at the same time prevents the head 11 of the fixation screw from moving, while the diameter of the cavity 6 between the second section 10 and the second end 5 of the pillar can be equal to the diameter of the first section 8. In this embodiment, the second section 10 forms a kind of neck that prevents the head 11 of the fixing screw from moving towards the other end 5 of the pillar. The second section 10 can be made as a square projection or as a rounded projection (for a rounded projection, the cavity 6 has the smallest diameter D2 only at the top of the projection). In another embodiment, there is no protrusion around the entire circumference of the cavity 6 at the location of the second section 10 of the cavity, and it has the form of at least one pin or point that enters from the wall of the cavity 6, whereby the cavity 6 at the location of the second section 10 of the cavity has a smaller cross-section than in the first section 8 of the cavity. It can be only one point or line protrusion, preferably several such protrusions regularly distributed around the perimeter of the cavity (e.g. 2 protrusions opposite each other, 6 protrusions at regular intervals, etc.), which prevent the head 11 of the fixation screw from moving. In another embodiment of the invention, the second section 10 of the cavity can have a different irregular non-circular cross-section, and this cross-section of the second section 10 can have any shape, e.g. an ellipse or an n-gon. In all these embodiments, however, the condition must be met that the largest radial dimension of the head 11 of the fixation screw is greater than the smallest radial dimension of the cross-section of the second section 10 of the cavity.

In another embodiment of the dental prosthesis assembly, the wall of the cavity 6 can be smooth in the other side 9 of the cavity, while the internal thread 16 of the abutment is formed directly by the external thread 17 of the safety screw only at the moment of connection of the safety screw 13 with the abutment 3. This embodiment of the abutment 3 without an internal thread 16 is simpler to manufacture, but less accurate in terms of the position of the safety screw 13 after it is tightened to the internal thread 16 of the pillar.

In an alternative embodiment of the assembly for carrying a dental prosthetic prosthesis, the additional securing of the position of the fixation screw 2 can be carried out completely without the use of the safety screw 13, e.g. by means of a simply inserted safety insert or by cementing the cavity 6 in the space between the head 11 of the fixation screw and the other end 5 of the abutment.

Industrial applicability

The invention of the assembly for carrying a dental prosthetic prosthesis with an integrated fixation screw can be used in modification for other areas of technology, where it is advantageous to integrate the fixation screw in another component, which allows handling only both of these elements at once without the risk of their separation.

Claims (10)

1. An assembly for carrying a dental prosthetic prosthesis including a dental implant (1), a fixation screw (2) and an abutment (3) for fixing a dental prosthetic prosthesis, wherein the abutment (3) includes a first end (4) of an abutment, a second end (5) of an abutment opposite the first end (4) of the abutment and the cavity (6) of the abutment, wherein the cavity (6) of the abutment opens at both the first and the second end (4,5) of the abutment and the first end (4) of the abutment abuts the dental implant (1), while at least part of the fixation screw (2) is located in the cavity (6) of the abutment and the fixation screw (2) is connected to the dental implant (1), characterized in that the cavity (6) of the abutment includes the first side (7) of the cavity including the first section (8) ) of the cavity and the second side (9) of the cavity comprising the second section (10) of the cavity, wherein the first side (7) of the cavity is located closer to the first end (4) of the pillar than the second side (9) of the cavity and the cross section of the first section (8) of the cavity is larger than the cross-section of the second section (10) of the cavity, wherein the fixation screw (2) includes the head (11) of the fixation screw, which is located in the first side (7) of the cavity. 2. Assembly for carrying a dental prosthesis according to claim 1, characterized in that the diameter of the head (11) of the fixation screw is larger than the diameter of the second section (10) of the cavity. 3. Assembly for carrying a dental prosthesis according to claim 1 to 2, characterized in that the cross-section of the cavity (6) of the pillar is circular in the planes perpendicular to the longitudinal axis (12) of the cavity of the pillar, while the ratio of the diameter of the first section (8) of the cavity D i and the diameter of the second section (10) of the cavity D 2 is greater than 1. 4. Assembly for carrying a dental prosthesis according to claim 3, characterized in that the ratio of the diameter of the first section (8) of the cavity D i and the diameter of the second section (10) of the cavity D 2 is 1.5 to 1.65. 5. Assembly for carrying a dental prosthesis according to claims 1 to 4, characterized in that it further comprises a safety screw (13) comprising a pin (14) of the safety screw, and that the head (11) of the fixation screw comprises a manipulation hole (15), wherein the pin (14) of the safety screw is in contact with the bottom of the handling hole (15). 6. Assembly for carrying a dental prosthesis according to claim 5, characterized in that the second side (10) of the cavity includes an internal thread (16) of the abutment and the safety screw (13) includes an external thread (17) corresponding to the internal thread (16) of the abutment. 7. A method of manufacturing an assembly for carrying a dental prosthetic replacement according to claims 1 to 6, characterized in that the pillar (3) is in its initial state a semi-finished product including a cavity (6) of uniform size, and that it includes the step of shaping the pillar (3) around at least part of the fixation screw (2) and the subsequent step of connecting the fixation screw (2) with the dental implant (1). 8. A method of manufacturing a set for carrying a dental prosthetic replacement according to claim 7, characterized in that the step of forming the pillar (3) is performed by forming and chip machining technology. 9. The method of manufacturing an assembly for carrying a dental prosthetic prosthesis according to claims 7 and 8, characterized in that after the step of connecting the fixation screw (2) with the dental implant (1) includes the step of inserting and tightening the safety screw (13) against the fixation screw (2) . 10. The method of manufacturing an assembly for carrying a dental prosthetic replacement according to claim 9, characterized in that the internal thread (16) of the abutment is made by chip machining or cold forming.