WO2016052860A1 - Dental gingiva expander having improved operation convenience - Google Patents

Abstract

The present invention relates to a dental gingiva expander and, more particularly, to a gingiva expander surrounded with a silicone shell, hydrogel being bonded to both sides of the gingiva expander in the shape of a polygonal post or an elliptical post, which increases the area of contact with the alveolar bone and the gingiva, or in the shape of a streamline, which facilitates insertion into the gingiva using a narrow portion on one side thereof. The gingiva expander is advantageous in that, since the hydrogel is manufactured in the shape of a polygonal post, an elliptical post, or a streamline, the area contact between the hydrogel and the alveolar bone is increased, during insertion beneath the periosteum after gingiva incision, thereby increasing the rate of successful seating; the volume before swelling is decreased, compared with hydrogel included in conventional gingiva expanders, thereby facilitating insertion beneath the gingiva and improving the convenience in operation; and the reduced area of incision quickens recovery after operation.

Description

Dental gingival expander with improved convenience

The present invention relates to a dental gingival expander, and more particularly, the insertion into the gingiva using a narrow column of a hydrogel or one side of a hydrogel or an elliptic cylinder having a wide contact area with the alveolar bone and the gingiva. The streamlined hydrogel eases, the invention relates to a gingival expander having a structure surrounded by a silicon shell bonded to both ends, there is an advantage that can be used to expand the tissue of the desired area and the convenience of the procedure.

In dentistry, an appropriate amount of alveolar bone is required around the implant implant as a prerequisite for successful alveolar bone adhesion and initial stability. Therefore, the lack of alveolar bone volume or alveolar bone volume before implantation is expected, or when the implant is exposed according to the positioning of the implant for the production of a normal prosthesis during implant placement, or the absorption of the alveolar bone due to inflammation after implant placement For this reason, guided bone regeneration-augmentation (GBR) is performed when part of the implant is exposed to the alveolar bone.

The bone-induced regeneration is a procedure to secure bone space by using a barrier membrane at the gingival area irrespective of the periodontal tissue, and to induce the introduction of osteoblasts into the bone defect in the lower part of the space to promote bone tissue regeneration.

The bone guided regeneration procedure is generally used for absorbing or non-absorbing dental barrier, and various bone materials such as autologous bone, allogeneic bone, xenograft and synthetic bone. Dental barrier membranes are known to prevent the rapid regeneration of gingival epithelium to grow and enter the damaged area first, and to maintain proper space to help connective tissue differentiation and bone regeneration. Therefore, techniques for dental barrier membranes that can further improve the success rate of implant procedures because they help the prognosis of the bone guided regeneration procedure have been actively studied.

On the other hand, lack of bone mass or bone volume before implant placement causes a problem that the space required for alveolar bone regeneration is reduced by causing retraction of the gingiva covering the tooth. Therefore, as shown in Figure 1, before the operation of bone-induced regeneration procedure by implanting a gingival dilator containing a hydrogel, by expanding the depressed gingiva through the swelling properties of the hydrogel to secure enough space for alveolar bone regeneration This problem can be solved.

The self-expansible tissue expansion member (Gewebeexpander) presented in U.S. Patent No. 5496368 (registered on March 5, 1996) is for making a hollow space for conjugating transplanted tissue or for arranging tissue for self-transplantation. When the member is implanted into a tissue, a tissue dilator is presented that includes a polymer that absorbs and swells body fluids or water.

The tissue expander presented in US Pat. No. 6282116 (registered on May 8, 2001) is mainly composed of a silicone balloon, and the tissue expander is introduced into an area requiring expansion, and then swells for a predetermined time by injecting a saline solution. Proposed organization expanders.

The gingival dilator equipped with the periodontal tissue regeneration function disclosed in Korean Patent Publication No. 2013-0108118 (published on October 02, 2013) can shorten the gingival expansion time, thereby reducing the implant procedure time and sustaining release of the growth factor in the gingival dilator. This study suggests a gingival dilator that can restore the gingival tissue weakened by rapid tissue expansion in a short time.

However, the conventional tissue expander takes 6 to 8 weeks to expand the tissue when implanted into the depressed gingiva, or the inserted tissue expander fails to settle in the gingival, protrudes into the incision and adversely affects the healing of the incision. Since there is a problem, the development of a tissue dilator that can increase the rate of gingival fixation and obtain the effect of tissue expansion of the desired area is still required.

The present invention is to solve the above-mentioned problems, to reduce the swelling time of the gingival, and to provide a gingival dilator that can obtain the expansion effect of the desired area in the gingiva.

In addition, in the present invention, the hydrogel of the gingival expander has a round cylindrical shape, and in order to compensate for the problem that the contact area is narrow when inserted after the gingival incision, it does not settle out of the gingiva, and thus, a polygonal hydrogel and an elliptic cylinder. To present the gingival dilator containing the type hydrogel and streamlined hydrogel, and to reduce the volume before swelling of the hydrogel to reduce the incision site and to improve the convenience of the procedure.

The gingival dilator proposed in the present invention, by placing both sides of the silicone shell as a junction, and completely secured to the alveolar bone, obtains the effect of tissue expansion of the desired site, and has a positive effect on the recovery of the surrounding soft tissue.

Dental gingival expander with improved convenience of the procedure of the present invention to achieve the object as described above, the polygonal or elliptic columnar hydrogel, which absorbs body fluid and secures the gingival space through the body swelling, the hydration It surrounds the gel, and includes a silicon shell including a joint bonded to both sides and a screw for fixing the joint and the alveolar bone of the silicone shell.

The hydrogel is a hydrogel crosslinked with a monomer having a methacrylate group and a monomer having a vinyl group.

The cross section of the polygonal hydrogel is a regular polygon having 3 to 8 sides, and the contact area of the polygonal hydrogel with the alveolar bone is 0.35 to 1.5 cm 2. to be.

Alternatively, the cross-section of the polygonal hydrogel is polygonal, and the length of the linear symmetry axis of the polygon is longer than or equal to the rectangular long axis that meets at a right angle with respect to the linear symmetry axis.

The ratio between the longitudinal axis of the elliptic cylindrical hydrogel cross section and the horizontal axis perpendicular to the longitudinal axis is not one.

Dental gingival expander with improved convenience of the procedure according to another embodiment of the present invention, a streamlined hydrogel to secure the gingival space through swelling in the body by absorbing body fluid, surrounding the hydrogel, the joint portion is joined to both sides It includes a silicon shell and a screw for fixing the junction and the alveolar bone of the silicon shell.

The hydrogel has a flat streamline shape that narrows toward one side or both sides.

The silicon shell has a thickness of 200 to 250 μm, and includes holes having a diameter of 0.3 to 0.7 mm, and both joints and alveolar bones of the silicon shell are fixed using the screws.

The gingiva dilator of the present invention is manufactured in the shape of a hydrogel with a polygonal column, an elliptic column, or a streamline, and when inserted under the alveolar periosteum after gingival dissection, the contact area between the hydrogel and the alveolar bone can be increased to increase the seating rate. . The volume before the swelling of the hydrogel is smaller than the volume before the swelling of the hydrogel included in the gingival dilator, so it is easy to insert under the gingival, increasing the convenience of the procedure, and has a fast recovery effect after the procedure due to the reduction of the incision site. have.

In addition, by fixing both sides of the silicon shell to the alveolar bone by using screws, respectively, it is possible to prevent the movement of the implanted gingival dilator, thereby obtaining an expansion effect on a desired area of the gingiva.

Figure 1 is a schematic diagram showing a state in which the gingiva is expanded when a conventional gingival dilator is implanted.

2 is a diagram schematically showing the gingival dilator of the present invention.

Figure 3 is observed before and after the swelling (a1, b1) and the post-swelling (a2, b2) form of the conventional round cylindrical hydrogel (a) and the square column hydrogel (b) according to an embodiment of the present invention It is a photograph.

Figure 4 is a conventional round cylindrical hydrogel (a) and swelling before (a1, c1) and after swelling (a2, c2) of the top and side of the elliptic cylindrical hydrogel (c) according to another embodiment of the present invention It is a photograph observing the form.

5 is a conventional round cylindrical hydrogel (a) and the swelling before (a1, d1) and after the swelling (a2, d2) of the top and side of the streamlined hydrogel (d) according to another embodiment of the present invention It is a photograph observing.

6 is a diagram schematically showing a cross section of a conventional round cylindrical hydrogel and a cross section of a regular polygonal hydrogel according to another embodiment of the present invention.

7 is a graph showing the contact area with the alveolar bone of the regular polygon pillar hydrogel according to another embodiment of the present invention.

8 is a graph comparing volumes before and after swelling of Comparative Examples 1 to 3 (round cylindrical hydrogels, a) and Examples 1 to 3 (square prismatic gels, b).

9 is a graph comparing the volumes before and after swelling of Comparative Examples 1 to 3 (round cylindrical hydrogels, a) and Examples 4 to 6 (elliptic cylindrical hydrogels, c).

10 is a graph comparing the maximum expansion ratio of Comparative Examples 1 to 3 (round cylindrical hydrogel, a) and Examples 1 to 3 (square pillar hydrogel, b).

11 is a graph comparing the maximum expansion ratios of Comparative Examples 1 to 3 (round cylindrical hydrogels, a) and Examples 4 to 6 (elliptic cylindrical hydrogels, c).

12 is a graph comparing the volume before and after swelling of Comparative Example 1 (round cylindrical hydrogel, a) and Example 7 (wired hydrogel, d).

13 is a graph comparing the swelling period of the gingival expander according to Comparative Example 1 (round cylindrical hydrogel, a) and Example 1 (square pillar hydrogel, b).

14 is a graph comparing the swelling speed according to the hole size of the silicon shell of the present invention.

15 is a graph comparing the swelling speed according to the thickness of the silicon shell of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to ordinary or dictionary meanings, but should be construed as meanings and concepts consistent with the technical spirit of the present invention.

Throughout this specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless otherwise stated.

In addition, unless otherwise specified herein, an axis of symmetry refers to an axis that overlaps when a figure is symmetric about a straight line. In other words, a straight line that completely overlaps when a certain line is folded with a straight line on its center axis as a folding line, and the long axis is the longest length of the right angle axis that meets the line symmetry axis in the polygon and forms an angle of 90 degrees. It means a right angle axis with.

Hereinafter, with reference to the accompanying drawings the dental gingival expander of the present invention will be described in detail.

Referring to Figure 2, the gingival dilator of the present invention is a gingival dilator that is implanted into the gingiva before the guided bone regeneration-augmentation (GBR), the hydration that absorbs body fluids to secure the gingival space through swelling in the body It includes a gel (10), a silicone shell 20 surrounding the hydrogel (10), the bonding portion 23 is bonded to both sides and a screw for fixing the bonding portion 23 and the alveolar bone of the silicone shell.

The hydration gel 10 serves to secure the gingival space through swelling in the body by absorbing body fluid, and preferably, a monomer having a methacrylate group and a monomer having a vinyl group are crosslinked. Bound polymers can be used.

The hydrogel 10 in which the monomer having a methacrylate group and the monomer having a vinyl group is crosslinked is methyl methacrylate (MMA) and vinyl-pyrrolidone (VP) 6-7: 4. It can be synthesized by crosslinking at a mass ratio of ˜3, in addition to hydroxyethyl methacrylate (HEMA) and vinyl-pyrrolidone (VP), or n-methacrylate (n = carbon number, 4,8,12). ) And vinyl-pyrrolidone (VP) can be synthesized by crosslinking (n = 4: butyl methacrylate, n = 8: octyl methacrylate, n = 12 lauryl methacrylate).

When the body fluid is absorbed into the hydrogel 10, a -COOH functionality of methacrylate (methacrylate) that make up the hydrogel (10) -COO ^- and is dissociated into H ⁺ -COO ^- cross hydrogel polymer resulting from The repulsive force of the liver is increased, which leads to the expansion of the spacing between the polymer chains and thus the self-swelling ability. The swelled hydrogel 10 is swelled in a round cylindrical shape that can expand the gingiva generally broadly, regardless of its initial shape.

The silicon shell 20 is a porous or semi-permeable membrane, the hole is preferably formed so that the body fluid or the fluid can penetrate. Therefore, by controlling the presence and the number of holes of the silicon shell 20, it is possible to control the diffusion rate of the body fluid inside the gingival dilator.

In the present invention, the diameter of the hole of the silicon shell 20 is preferably 0.3 to 0.7 mm. When the diameter is less than 0.3 mm, the amount of bodily fluid entering the silicon shell 20 is small so that the swelling speed of the hydrogel 10 is reduced. It is difficult to obtain a maximum expansion volume within a desired period (4 weeks), and when the hole diameter of the silicon shell 20 exceeds 0.7 mm, the amount of body fluid entering the silicon shell 20 increases, thereby increasing the amount of the hydrogel 10 ) Rapid swelling, which can cause strong tension on the incision, adversely affecting the healing of the incision.

Both sides of the silicone shell 20 may include a joint 23 bonded with an adhesive. Both junctions 23 of the silicon shell 20 are fixed to the alveolar bone using a screw. The silicone shell of the conventional gingival expander fixed only one side with the alveolar bone so that movement of the gingiva occurs after the procedure, but the gingival expander of the present invention uses a screw on both sides of the joint 23 of the silicon shell 20 by using a screw. It is perfectly fixed and prevents movement within the gingiva. Therefore, the tissue can be expanded to a desired area, and there is no movement of the gingival dilator inside the gingival, thus helping to recover the surrounding soft tissue.

Referring to FIG. 3, before the swelling of the conventional round cylindrical hydrogel (FIG. 3 a) and the square pillar hydrogel (FIG. 3 b) according to an embodiment of the present invention (a1 or b1 of FIG. 3). ) And the picture after swelling (a2 or b2 in FIG. 3).

The hydrogel of the gingival expander of the present invention is dried under pressurized conditions using various types of drying molds in order to increase convenience during the procedure, thereby controlling the shape of the hydrogel. The hydrogel may be modified in various forms as necessary, and the form is preferably a polygonal column shape.

The cross section of the polygonal hydrogel is a regular polygon having a number of sides of 3 to 8, The contact area of the hydrogel with the alveolar bone is 0.35 to 1.5 ㎠ to be. When the contact area of the hydrogel having a regular polygonal cross section exceeds 1.5 cm 2, the initial volume of the hydrogel is also increased, resulting in a large incision site during the procedure, which slows recovery after the procedure, and when the contact area is less than 0.35 cm 2, the periodontal period Lower settling rate with the bone is less convenient for the procedure.

Alternatively, the cross-section of the polygonal hydrogel is polygonal, and the length of the line symmetry axis of the polygon is longer than or equal to the rectangular long axis which meets at right angles with respect to the line symmetry axis. Accordingly, the cross section of the polygonal hydrogel may be used as a polygon of various shapes, and the shape of the polygon is not particularly limited.

As shown in Figure 3, when comparing the swelling before and after the swelling of the polygonal hydrogel and the conventional round cylindrical hydrogel, the initial shape before the swelling (left of Figure 3) is different from each other, but gingival expansion as the swelling progresses It can be seen that the swelling in a round cylindrical shape (right side of Figure 3) effective for, and was observed in the same manner in the other examples of elliptic columnar hydrogel (FIG. 4) and streamlined hydrogel (D in Figure 5). .

Referring to Figure 4, before the swelling of the conventional round cylindrical hydrogel (Fig. 4a) and the elliptic columnar hydrogel (FIG. 4c) according to another embodiment of the present invention (a1 and c1 in Figure 4) ) And the picture after swelling (a2 and c2 of FIG. 4). The elliptic column-type hydrogel has a cross section in which the ratio between the vertical axis and the horizontal axis perpendicular to the vertical axis is not one.

Referring to FIG. 5, before the swelling of the conventional round cylindrical hydrogel (FIG. 5 a) and the streamlined hydrogel (FIG. 5 d) according to another embodiment of the present invention (a1 and d1 in FIG. 5). It is a photograph comparing the appearance after swelling (a2 and d2 in Figure 5). The streamlined hydrogel is preferably a flat streamline that becomes narrower toward one or both sides. Therefore, the streamlined hydrogel has an advantage of being easily inserted into the gingiva during the procedure by using a narrow part of one side, and due to the flat shape, the contact area with the alveolar bone is widened during the procedure, and the convenience of the procedure is increased. do.

Hereinafter will be described in detail through a preferred embodiment according to the present invention.

[Experimental Example 1] Comparison of Contact Area with Alveolar Bone by Cross-sectional Area of Hydrogel

6 and 7 are schematic diagrams showing cross sections of a conventional cylindrical cylindrical hydrogel and a regular polygon pillar hydrogel, which is an embodiment of the present invention, respectively (FIG. 6) and a contact area between the regular polygon hydrogel and the alveolar bone. A graph (FIG. 7) is shown.

shape	Round cylinder	Regular triangle	Regular square	Regular pentagon	Regular hexagon	Regular octagon	Regular nonagon	Regular decagon
Height (cm)	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5
Volume (ml)	0.42	0.42	0.42	0.42	0.42	0.42	0.42	0.42
Cross section area (cm 2 )	0.28	0.28	0.28	0.28	0.28	0.28	0.28	0.28
Length of one side (cm)	-	0.80	0.53	0.41	0.33	0.24	0.21	0.19
Area of contact with alveolar bone (cm 2 )	-	1.21	0.79	0.61	0.49	0.36	0.32	0.29

Table 1 shows the length of one side and the contact area between the alveolar bone according to the round cylindrical and regular polygonal hydrogels fixed with a height of 1.5 cm and 0.42 ml. Referring to FIG. 7 and Table 1, the volume is 0.42 ml. When the cross section of the fixed polygonal hydrogel is fixed to an equilateral triangle, the contact area between the hydrogel and the alveolar bone is the widest, and as the number of angles increases, the contact area becomes narrower. The contact area is preferably 0.35 to 1.5 cm 2.

If the contact area exceeds 1.5 cm 2, accordingly, the initial volume of the hydrogel is also increased to increase the incision site during the procedure, and if the contact area is less than 0.35 cm 2, the rate of settlement with the periodontal bone is low, thereby reducing the convenience of the procedure.

Therefore, the regular polygonal hydrogel is wider in contact area with the alveolar bone due to the prismatic surface, and the seating rate is increased, and the movement of the gingiva inside the gingiva is minimal, and the convenience of the procedure is increased.

Experimental Example 2 Preparation of Hydrogel

 Methyl methacrylate (MMA), vinyl-pyrrolidone (VP), 2, such that crosslinked methyl methacrylate (MMA) and vinyl-pyrrolidone (VP) have a mass ratio of 6-7: 4-3 0.1 wt% of 2'-azobisisobutylonitrile (polymerization initiator), 0.2 wt% of hydroxypropyl methacrylate (crosslinking agent), and methylpyrrolidone (solvent) were combined to give a total solution concentration of 0.8 M. After blending, the blend was thermally polymerized to a temperature of 65 ° C. for 24 hours. Subsequently, the residues such as solvents were removed and hydrolyzed to prepare hydrogels crosslinked with methyl methacrylate (MMA) and vinyl-pyrrolidone (VP) in 0.15, 0.25 and 0.42 ml round cylindrical molds having different volumes. Pour Comparative Examples 1 to 3 were prepared.

The hydrogels prepared in the same manner as in Comparative Examples 1 to 3 were placed in a square column-shaped compression mold, and compressed and dried for 5 hours by applying an average 8 MPa pressure and an average temperature of 60 ° C. to prepare Examples 1 to 3.

The hydrogels prepared in the same manner as in Comparative Examples 1 to 3 were placed in an elliptic cylindrical compression mold, and compressed and dried for 5 hours by adding an average 8 MPa pressure and an average temperature of 60 ° C. to prepare Examples 4 to 6.

0.55 ml of the methyl methacrylate (MMA) and vinyl-pyrrolidone (VP) cross-linked hydrogels were put in a flat streamlined compression mold and subjected to compression drying for 5 hours by applying an average 8 MPa pressure and an average temperature of 65 ° C. Example 7 was prepared.

Examples 1 to 7 and Comparative Examples 1 to 3 were swelled by immersion in saline for 40 days in an incubator at 37 ° C.

Experimental Example 3 Comparison of Volume Before and After Swelling of Comparative Example and Example

size	Form of hydrogel	Volume before swelling (ml)	Volume after swelling (ml)	Expansion rate (Q) ＊
Small	Round Cylinder (Comparative Example 1)	0.15	0.7	4.7
	Square Column Type (Example 1)	0.1	0.7	7
	Elliptic column type (Example 4)	0.1	0.7	7
Medium	Round Cylinder (Comparative Example 2)	0.25	1.3	5.2
	Square Column Type (Example 2)	0.2	1.3	6.5
	Elliptic column type (Example 5)	0.2	1.3	6.5
Large	Round Cylinder (Comparative Example 3)	0.42	2.1	5
	Square Column Type (Example 3)	0.37	2.1	5.7
	Elliptic column type (Example 6)	0.37	2.1	5.7
Streamlined (Example 7)		0.05	0.5	10

Expansion rate (Q) ^＊ = (Swollen Volume of Hydrogel) / (Dry Volume of Hydrogel)

8 is a volume before and after swelling of the comparative examples 1 to 3 of the conventional round cylindrical hydrogel (a in FIG. 8) and the square pillar hydrogel (b in FIG. 8) according to Examples 1 to 3 of the present invention. 9 is a graph comparing the conventional round cylindrical hydrogels (a in FIG. 9), and Comparative Examples 1 to 3 and elliptic cylindrical hydrogels according to Examples 4 to 6 of the present invention (c in FIG. 9). ) Is a graph comparing the volume before and after swelling.

8 and 9, while the hydrogel of the present invention is further subjected to a drying process under pressure conditions, the volume of the hydrogel is reduced by 12 ~ 34 vol% than the volume of the hydrogel of the conventional gingival expander, The volume after swelling was confirmed to be the same. Therefore, Examples 1 to 6 have a smaller volume before swelling than Comparative Examples 1 to 3, so that the incision site becomes smaller during the procedure, so that the recovery is faster, and the small volume facilitates the insertion under the gingiva.

10 is the maximum expansion rate (Q) of the conventional round cylindrical hydrogel (a in FIG. 10) of Comparative Examples 1 to 3 and the square column type hydrogel (b in FIG. 10) according to Examples 1 to 3 of the present invention. ), The average value of the maximum expansion rate (Q) of the Comparative Examples 1 to 3 is 4.97, the average value of the maximum expansion rate (Q) of the Examples 1 to 3 was 6.4 it was confirmed that the excellent swelling characteristics.

11 is the maximum expansion rate (Q) of the conventional round cylindrical hydrogel (a in FIG. 11) Comparative Examples 1 to 3 and the elliptic cylindrical hydrogel (c in FIG. 11) according to Examples 4 to 6 of the present invention ), The average value of the maximum expansion rate (Q) of the Comparative Examples 1 to 3 is 4.97, the average value of the maximum expansion rate (Q) of the Examples 1 to 3 was 6.4 it was confirmed that the excellent swelling characteristics. .

12 is a graph comparing a volume before and after swelling of Comparative Example 1, which is a conventional round cylindrical hydrogel (a in FIG. 12) and a streamlined hydrogel (d in FIG. 12), which is a seventh embodiment of the present invention. The volume before swelling of 1 and Example 7 was 0.15 ml and 0.05 ml, but became 0.7 ml and 0.5 ml after swelling.

Comparing the maximum expansion rate of Comparative Example 1 and Example 7, it can be seen that the maximum expansion rate of Example 7 is significantly excellent in 4.7 and 10. Accordingly, the streamlined hydrogel of the present invention has a small volume before swelling, and has a flat streamline shape that narrows toward one side or both sides, so that it is easy to insert during the procedure, and the incision is small, so that the recovery is faster.

Experimental Example 4 Comparison of Swelling Time of Comparative Example 1 and Example 1

As shown in FIG. 13, the initial volume of the hydrogel before swelling in Comparative Example 1 (a in FIG. 13) was 0.15 ml, and the initial volume of the hydrogel before swelling in Example 1 (b in FIG. 13) was 0.1 ml. Although gradually swelled with the body fluid introduced through the silicon hole, the volume after swelling is equal to 0.7 ml, Comparative Example 1 takes a swelling time of 40 days until swelling is completed in a volume of 0.7 ml, Example 1 It was confirmed that the need for 27 days of swelling time.

Therefore, Example 1 of the present invention has the advantage of having a short swelling time compared to Comparative Example 1, since the volume before the swelling Example 1 is smaller than Comparative Example 1 is easy to insert under the gingival incision during the procedure It was found that the decrease and convenience increased.

Experimental Example 5 Comparison of Hole Size and Thickness in Silicon Shell

14 is a graph comparing the swelling speed according to the hole size of the gingival dilator prepared by putting the hydrogel of Example 1 in a 200 μm thick silicone shell, bonding both sides, and forming a hole using a punch. In the present invention, the diameter of the hole of the silicon shell is preferably 0.3 to 0.7 mm. If the diameter is less than 0.3 mm, the amount of body fluid entering the silicon shell is small and the swelling speed of the hydrogel is low, making it difficult to obtain a maximum expansion volume within a desired period (4 weeks), and the hole diameter of the silicon shell is 0.7 mm. If exceeded, the amount of body fluid entering the silicone shell increases, leading to rapid swelling of the hydrogel, which may exert strong tension on the incision and adversely affect the healing of the incision.

15 is a graph comparing the swelling speed according to the thickness of the silicon shell of the gingival expander prepared by placing the hydrogel of Example 1 in the silicon shell, bonding both sides, and forming a hole of 0.4 mm using a punch. As shown, it can be seen that the thicker the silicone shell, the greater the force that hinders the swelling of the hydrogel surrounded by the shell, thereby decreasing the swelling rate. The thickness of the silicon shell is preferably 200 to 250 μm. If the thickness of the silicon shell is less than 200 μm, the swelling speed is increased. If the swelling speed is faster than appropriate, there is a problem that a strong tension is applied to the incision to adversely affect the healing of the incision. In addition, when the thickness of the silicon shell exceeds 250 µm, the swelling speed is slowed and it takes a long time to expand the tissue.

The present invention relates to a dental gingival expander, a streamlined type that facilitates insertion into the gingival using a narrow or partial portion of a hydrogel or hydrogel of a polygonal or elliptic column type having a wide contact area with the alveolar bone and gingiva. The hydrogel has a structure surrounded by a silicon shell bonded to both ends. The gingiva dilator of the present invention has the effect of providing the convenience of the procedure and expanding the tissue of the desired area, there is industrial applicability.

Claims (10)

1. A polygonal columnar or elliptic columnar hydrogel that absorbs body fluid and secures a gingival space through swelling in the body;

   A silicon shell surrounding the hydration gel and including a joint portion joined to both sides; And

   And a screw for fixing the joint and the alveolar bone of the silicone shell.
2. The method of claim 1,

   The hydrogel is a hydrogel with a monomer having a methacrylate (metheth) and a monomer having a vinyl group (vinyl) cross-linked hydrogel, improved dental gingiva expander.
3. The method of claim 1,

   Cross-section of the polygonal hydrogel gel is a regular polygon with the number of sides 3 to 8, dental gingival expandr with improved convenience of the procedure.
4. The method of claim 3,

   A dental gingival expander having improved ease of treatment, wherein the contact area with the alveolar bone of the polygonal hydrogel is 0.35 to 1.5 cm 2.
5. The method of claim 1,

   The cross section of the polygonal hydrogel is polygonal,

   The length of the polygonal symmetry axis of the polygon is longer than or equal to the right longitudinal axis to meet at a right angle relative to the linear symmetry axis, dental gingival expandr with improved convenience.
6. The method of claim 1,

   The ratio of the longitudinal axis of the elliptic columnar hydrogel cross section and the horizontal axis perpendicular to the longitudinal axis is not 1, dental gingival device with improved procedure convenience.
7. A streamlined hydrogel that absorbs body fluid and secures a gingival space through swelling in the body;

   A silicon shell surrounding the hydration gel and including a joint portion joined to both sides; And

   And a screw for fixing the joint and the alveolar bone of the silicone shell.
8. The method of claim 7, wherein

   The hydration gel is a flat streamline that is narrower in width toward one side or both sides, the dental gingival expandr with improved convenience.
9. The method according to any one of claims 1 to 8,

   The thickness of the silicon shell is 200 ~ 250 ㎛, including a diameter of 0.3 ~ 0.7 ㎜, dental gingival dilator with improved convenience.
10. The method according to any one of claims 1 to 8,

    Both sides of the joint and the alveolar bone of the silicone shell is fixed using the screw, the dental gingiva expander improved convenience.

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