Improved RPD bracket, model construction method and manufacturing method

Abstract

The present invention discloses an improved RPD bracket, a model construction method and a manufacturing method. The disclosed improved RPD bracket includes a bracket body, on which at least one edentulous area and at least one fixing portion are provided, the edentulous area is provided with at least one abutment preparation body, the two sides of the abutment preparation body are provided with a labial part and a lingual part, and the cervical margin area and the upper surfaces of the labial part and the lingual part of the abutment preparation body are reserved with a base installation space simulating gingival tissue. The disclosed model construction method is to perform back-cutting processing on the basis of an existing RPD bracket model to obtain a model of the bracket of the present invention. The disclosed manufacturing method is to prepare the bracket of the present invention by using a 3D printing method and a data cutting method. The present invention has the characteristics of being beautiful and easy to manufacture.

Description

Technical Field

[0001] The present invention relates to a cavity RPD bracket technology, and in particular to an improved RPD bracket, a model construction method and a manufacturing method. Background Art

[0002] The existing RPD bracket is made of metal as a whole (such as the oral prosthesis disclosed in CN201610316652.5). The bracket in contact with the gums in the edentulous area has a large color contrast with the gums, and there is still a certain gap in aesthetic requirements compared with the base of simulated gum tissue made by traditional technology. In the prior art, the base part is roughened and the base of simulated gum tissue is simulated by manual baking to achieve aesthetic improvement, but the process still uses manual methods, which increases the operation time and workload. Summary of the invention

[0003] In view of the defects or shortcomings of the prior art, an object of the present invention is to provide an improved RPD bracket.

[0004] The improved RPD bracket provided by the present invention includes a bracket body, on which at least one edentulous area and at least one fixing part are provided, the edentulous area is provided with at least one abutment preparation body, and the abutment preparation body is provided with a labial part and a lingual part on both sides, and also includes: (a) a base installation space simulating gingival tissue is reserved in the cervical margin area and the upper surfaces of the labial part and the lingual part of the abutment preparation body; the width of the labial part is smaller than the width of the lingual part, and the labial part of the edentulous area is provided with a tooth-shaped groove, and the lingual part is provided with a mounting groove; or (b) a base installation space simulating gingival tissue is reserved in the cervical margin area and the upper surfaces of the labial part of the edentulous area, and the labial part of the edentulous area is provided with at least one mounting hole.

[0005] Preferably, the interior of the abutment preparation is a hollow structure with an opening at the top.

[0006] Optionally, mounting holes are provided between the abutment preparations in solution (a).

[0007] Furthermore, it also includes a base for simulating gingival tissue that matches each edentulous area, the base for simulating gingival tissue is provided with an independent through hole that can be sleeved on each abutment preparation body, and the bottom of the labial side of the base for simulating gingival tissue is provided with a protrusion that matches the tooth-shaped groove, and the lingual side can be inserted into the installation groove; or, the base for simulating gingival tissue matches the labial side of the edentulous area, and the side of the base for simulating gingival tissue close to the abutment preparation body is provided with an independent slot that matches each abutment preparation body, and the bottom of the base for simulating gingival tissue is provided with a protrusion that matches the installation hole.

[0008] Optionally, the sum of the thicknesses of the edentulous area bracket body and the base simulating gingival tissue is 3-4 mm.

[0009] Furthermore, the base simulating gum tissue is fixed to the bracket body by adhesive.

[0010] Furthermore, it also includes a dental crown, which is hollow inside and the internal hollow structure matches the abutment preparation.

[0011] At the same time, the present invention also provides a method for constructing the digital model of the improved RPD bracket. The provided method includes:

[0012] Constructing a bracket body model: constructing an RPD bracket model on the dentition model, wherein the RPD bracket model is provided with an edentulous area and a fixed part, an abutment preparation body is constructed in the edentulous area, and a labial part and a lingual part are constructed on both sides of the abutment preparation body;

[0013] Starting from the neck edge of the abutment tooth preparation, the labial and lingual parts are cut back downwards, so that the exposed part of the neck edge of the abutment tooth preparation in the edentulous area is increased, and the thickness of the labial and lingual parts is thinned, and then the labial part is cut back inwards, so that the width of the labial part is smaller than the width of the lingual part, and the labial part of the edentulous area is provided with a tooth-shaped groove, and the lingual part is provided with a mounting groove, and the area of ​​the cut part forms a reserved space for mounting a base plate simulating gingival tissue;

[0014] Alternatively, the labial part is cut downward from the neck edge of the abutment tooth preparation so that the exposed neck edge of the abutment tooth preparation in the edentulous area is increased and the labial part is thinned, and then at least one mounting hole is opened in the labial part, and the area of ​​the cut portion forms a reserved space for mounting a base for simulating gingival tissue;

[0015] Constructing a base model simulating gum tissue: constructing a base model simulating gum tissue in the reserved space;

[0016] Construct a crown model: Construct a crown model on the abutment preparation.

[0017] Furthermore, the present invention also provides a method for making the above-mentioned improved RPD bracket. The provided method comprises: constructing digital models of various parts; using 3D printing technology to make the bracket body; using gum-colored resin blanks and crown-colored resin blanks as raw materials, using CNC cutting methods to make a base and sub-crown simulating gum tissue; and then assembling the bracket body, the base simulating gum tissue, and the crown. Optionally, the bracket body, the base simulating gum tissue, and the crown are assembled by bonding with an adhesive.

[0018] The beneficial effect of the present invention is that the design can be used to design a base part simulating gingival tissue on the basis of the original RPD digital stent, and by adding a retention groove and a groove structure, the retention between the base simulating gingival tissue and the stent body is achieved, thereby improving the aesthetic effect of the original stent, and making it convenient to repair, thereby reducing the clinical operation time.

[0019] By splitting the design and digitally manufacturing different components of RPD, the full digital design and manufacturing of RPD is realized. The method of the present invention improves the aesthetic effect of the original metal bracket. Compared with the method of baking the surface of the metal base to form a base that simulates gingival tissue, it can greatly reduce the processing flow and reduce the error of human factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is one of the structural schematic diagrams of the improved RPD bracket body of the present invention;

[0021] Figure 2 for Figure 1 Structure diagram from different perspectives;

[0022] Figure 3 For Figure 1 Schematic diagram of the base structure of the simulated gingival tissue matching the edentulous area of ​​the stent body;

[0023] Figure 4 for Figure 3 Bottom view of

[0024] Figure 5 This is the second structural schematic diagram of the improved RPD bracket body of the present invention;

[0025] Figure 6 For Figure 5 Schematic diagram of the base structure that simulates the gingival tissue matching the edentulous area;

[0026] Figure 7 The dentition model + RPD bracket model constructed in Example 1;

[0027] Figure 8 The improved RPD bracket body model constructed for Example 1;

[0028] Fig. 9 The improved RPD stent body model constructed in Example 1 + the base model simulating gingival tissue;

[0029] Fig.10 The improved RPD stent body model constructed in Example 1 + the base model simulating the gingival tissue + the crown model;

[0030] Fig.11 The improved RPD bracket body made in Example 1, the left one is the RPD bracket made by SLM without support; the right one is the RPD bracket after support removal, heat treatment and conventional polishing, and the arrows in the figure point to the grooves;

[0031] Fig.12 The base part simulating gum tissue is made by numerical control cutting technology in Example 1, and a protrusion is provided at the bottom;

[0032] Fig.13 A dental crown made in Example 1;

[0033] Fig.14 The improved RPD bracket body model made in Example 2;

[0034] Fig.15 for Fig.14 Schematic diagram of different viewing angles;

[0035] Fig.16 The improved RPD stent body model of Example 2 + the base model simulating gum tissue;

[0036] Fig.17 The improved RPD stent body model of Example 2 + the base model simulating gum tissue + the crown model;

[0037] Fig.18 This is the denture made in Example 2. DETAILED DESCRIPTION

[0038] The width direction of the present invention is Figure 1 The direction shown is a (perpendicular to the paper plane), and the thickness direction is b (parallel to the paper plane).

[0039] The 3D printing method and CNC cutting method used in the manufacturing method of the present invention are both prior art. The structure and modeling method disclosed in the present invention can be manufactured by using the content disclosed in the prior art.

[0040] The traditional RPD bracket is provided with an edentulous area and a fixing part, and the edentulous area is provided with an abutment preparation body, that is, the bracket body and the gingival tissue part of the traditional RPD bracket are an integrated structure. The improved RPD bracket of the present invention is an improvement on the traditional RPD bracket, specifically, a base installation space simulating gingival tissue is reserved in the edentulous area, specifically, the neck edge of the abutment preparation body is cut down, so that the exposed neck edge of the abutment preparation body in the edentulous area is increased, and the thickness of the labial and lingual parts is thinned, thereby forming a reserved base installation space simulating gingival tissue in the neck edge area and the upper surface of the labial and lingual parts of the tooth preparation body. The thickness of the bracket at the corresponding part before cutting is 3-4mm.

[0041] Furthermore, in order to realize the installation of the base simulating gum tissue, the installation structure of the base simulating gum tissue is designed on the labial side and the lingual side. One installation structure is that the width of the labial side of the edentulous area (i.e., the side installed in the oral cavity close to or next to the lips) is smaller than the width of the lingual side, and at the same time, a tooth-shaped groove is provided on the edge of the labial side, and an installation groove is opened on the lingual side, specifically, a long strip-shaped installation groove. Specific examples are as follows Figure 1 and 2As shown, the bracket body 1 is provided with two fixing parts 10, an edentulous area 2, two abutment tooth preparations 3 are provided in the edentulous area, and the two sides are labial and lingual parts. A base installation space for simulating gingival tissue is reserved in the cervical margin area 40 and the upper surfaces of the labial and lingual parts of the abutment tooth preparations. At the same time, the labial part is narrower than the lingual part, and the edge 5 of the labial part is provided with a tooth-shaped groove 6, and the labial part is provided with a long strip-shaped installation groove 7 with a width suitable for the installation of a base for simulating gingival tissue. The number of edentulous areas, fixing parts and abutment tooth preparations on the corresponding RPD bracket is determined according to the dentition model 8 (case). The resin base matching the edentulous area in this example is as follows: Figure 3 and 4 As shown, the base 9 simulating gum tissue is provided with two independent through holes 91 matching two abutment tooth preparations, and the two sides of the through holes are labial side parts 93 and lingual side parts 92 matching the labial side parts and lingual side parts of the edentulous area, and the bottom of the labial side parts is provided with a first protrusion 94 matching the tooth-shaped groove, and the base simulating gum tissue is sleeved on the abutment tooth preparation through the through holes thereon, the tooth-shaped groove is meshed with the protrusion, and the lingual side part 92 is inserted into the mounting groove 7. Multiple tooth preparations cannot be placed together, and a reserved space for the base simulating gum tissue is formed by cutting back on one side (labial side), and at the same time, the mounting part is matched to improve the bonding force between the base simulating gum tissue and the bracket body.

[0042] An optional solution is that a mounting hole is provided on the bracket body between adjacent abutment tooth preparations, and a matching second protrusion is provided on the bottom of the corresponding numerical base.

[0043] In order to reduce the weight of the bracket, in a preferred solution, the interior of the abutment preparation can be designed as a hollow structure, and a hole 4 is opened on the top. Figure 1 shown.

[0044] Another installation structure of the base simulating gum tissue is that the width of the labial and lingual parts of the edentulous area is maintained at the corresponding width on the original RPD bracket, and a reserved installation space for the base simulating gum tissue is formed in the cervical area and the upper surfaces of the labial and lingual parts of the tooth preparation, and a mounting hole 10 is opened in the labial part. The specific example is as follows Figure 3 The base structure simulating gum tissue corresponding to the mounting structure is shown in FIG. Figure 6 As shown, the main shape of the base 12 simulating gum tissue matches the labial side of the edentulous area of ​​the bracket, and a tooth-shaped structure 121 is provided on the edge close to the abutment preparation body, which can be inserted into the gap 11 between adjacent abutment preparation bodies, and an independent card slot matching each abutment preparation body is formed accordingly. At the same time, a third protrusion matching the mounting hole is provided at the bottom of the base simulating gum tissue (not shown in the figure). In particular, when there are too many abutment preparation bodies, they cannot be put in place together through the sleeve hole, and there is a blockage. The card slot method can be selected to facilitate the placement of the base of the simulated gum tissue with multiple missing teeth.

[0045] The digital model design method corresponding to the improved RPD bracket of the present invention can use conventional software to first design the RPD bracket, that is, the traditional RPD bracket model, the edentulous area on the model is a smooth surface, and the edentulous area is provided with an abutment preparation; then, the edentulous area is subjected to corresponding "re-cut" processing on the basis of the traditional RPD bracket model to form a reserved base installation space for simulating gingival tissue. Generally speaking, the number of abutment preparations is 1-5, and the specific size of the re-cut can be reasonably adjusted according to the position of different teeth, so as to achieve the purpose of overall firmness and comfort of the bracket. On this basis, the design of the base model simulating gingival tissue is completed in the reserved base installation space simulating gingival tissue, and the crown model design is completed on the abutment preparation.

[0046] Furthermore, the bracket body is made by using 3D printing technology, and the material can be titanium alloy or other metal materials suitable for oral medicine or materials that can achieve the same or similar functions; the gum-colored and crown-colored resin blocks are processed by digital cutting technology to make the base and crown simulating the gum tissue. The gum part and the crown part can also be made by using 3D printing technology.

[0047] After that, the titanium alloy RPD bracket made by 3D printing is polished conventionally, and the prepared gum-colored base simulating gum tissue is passed through the hole structure, over the prepared body part of the titanium alloy RPD bracket, and respectively corresponding to the corresponding mounting parts on the metal substrate. A more secure way is to bond the base simulating gum tissue to the RPD bracket by bonding. The adhesive can be a resin adhesive or a resin-reinforced glass ionomer, such as FujiSem, 3M resin adhesive, etc.; then the crown is installed or bonded to the abutment preparation.

[0048] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Embodiment 1:

[0050] First, design the RPD bracket model. Use 3Shape professional removable denture bracket design software to design the basic outline of the RPD bracket on the dentition model, and then add the abutment preparation through Geomagic software. Figure 7 As shown, the thickness of the edentulous area bracket is 3.5 mm;

[0051] Next, the neck edge, lingual side and labial side of the abutment preparation in the edentulous area were cut back downward to reserve space for the base simulating the gingival tissue. The thickness of the neck edge of the abutment preparation was about 1.5 mm. Then the buccal side (labial side) was cut back as a whole, and then a retention tooth-shaped groove with a width of about 3 mm and a depth of about 1 mm was reserved (this value can vary according to different brackets). The constructed model is as follows Figure 8 As shown;

[0052] Then use the shell extraction function in the software to complete the hollow structure and complete the hollow mechanism design of the abutment preparation;

[0053] According to the reserved space, the cut-back data is supplemented with reference to the original bracket model data before cutting to complete the design of the base data simulating the gingival tissue. The edge of the base simulating the gingival tissue passing through the abutment preparation body is consistent with the edge of the abutment preparation body. The convexity designed on the tissue surface of the base simulating the gingival tissue should be consistent with the retention groove, such as Fig. 9 As shown;

[0054] On this basis, continue to complete the design of the crown data. The edge of the crown should be consistent with the edge of the abutment preparation. Refer to the tooth data to complete the adjustment of the bite surface. Fig.10 The RPD bracket, base and crown data are saved as digital files respectively.

[0055] Furthermore, the titanium alloy RPD bracket body was made by SLM technology, and the base and crown parts were made by CAM technology:

[0056] The new RPD bracket was quickly produced using SLM technology. Fig.11 .

[0057] Gum-colored polyoxymethylene resin disks (Henry Schein, USA) and natural tooth-colored polymethyl methacrylate (PMMA) resin disks (Yamahachi Dental, Japan) were selected, and a five-axis dental CNC cutting machine (Wieland Dental, Germany) was used to precisely CNC cut the base part simulating the gingival tissue ( Fig.12 shown) and crowns ( Fig.13 shown), finely polished.

[0058] The cut simulated gingival tissue base is put over the abutment preparation part on the RPD bracket, and is successfully placed along the retention groove and fixed with adhesive; then the resin crown is placed on the abutment preparation to complete the bonding. The adhesive can be a resin adhesive or a resin-reinforced glass ionomer, such as FujiSem, 3M resin adhesive, etc.

[0059] Embodiment 2:

[0060] First, the RPD bracket model was constructed on the dental arch model. Specifically, the basic outline of the RPD bracket was designed using 3Shape professional removable denture bracket design software, and then the abutment preparation was added using Geomagic software.

[0061] Next, the abutment preparation and the labial side of the edentulous area were cut back downward, and a mounting hole was opened in the labial side to obtain an improved RPD bracket model, such as Fig.14 and15 As shown;

[0062] Then, according to the reserved space, the cut-back data is supplemented with reference to the original bracket data before the cut-back, and the base model simulating the gingival tissue is designed, and a protrusion matching the mounting hole is added to the bottom of the base simulating the gingival tissue; Fig.16 , and then the sub-crown model is constructed on the abutment preparation, such as Fig.17 As shown.

[0063] The 3D printing method and CNC cutting method are used to process the bracket body, the base and the crown simulating the gum tissue. The final denture after assembly is as follows Fig.18 shown.

[0064] The specific embodiments of the present invention are described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions made to the present invention are also within the scope of the present invention.

Claims

1. An improved RPD bracket, comprising a bracket body (1), the bracket body (1) being provided with at least one edentulous area (2) and at least one fixing portion (10), the edentulous area being provided with at least one abutment tooth preparation body (3), the abutment tooth preparation body (3) being provided with labial side portions and lingual side portions on both sides, characterized in that: (a) A base installation space simulating gum tissue is reserved in the cervical margin area and the upper surfaces of the labial and lingual parts of the abutment tooth preparation; the width of the labial part is smaller than the width of the lingual part, and the labial part of the edentulous area is provided with a tooth-shaped groove (6), and the lingual part is provided with a mounting groove (7); Alternatively, (b) a base installation space simulating gum tissue is reserved in the cervical margin area and the upper surface of the labial side of the abutment tooth preparation, and at least one installation hole is opened in the labial side of the edentulous area; It also includes a base for simulating gum tissue that matches each edentulous area, the base for simulating gum tissue is provided with an independent through hole (91) that can be sleeved on each abutment preparation body, and the bottom of the labial side portion (93) of the base for simulating gum tissue is provided with a protrusion (94) that matches the tooth-shaped groove, and the lingual side portion (92) can be inserted into the installation groove (7); Alternatively, the base of the simulated gingival tissue matches the labial side of the edentulous area, and an independent slot (121) matching each abutment tooth preparation is provided on one side of the base of the simulated gingival tissue close to the abutment tooth preparation, and a protrusion matching the mounting hole is provided at the bottom of the base of the simulated gingival tissue; The abutment tooth preparation (3) is hollow inside and has a hole (4) at the top; (a) Mounting holes are provided between the abutment preparations described in the scheme.

2. The improved RPD bracket according to claim 1, characterized in that: The sum of the thicknesses of the edentulous area bracket body and the base simulating the gingival tissue is 3-4 mm.

3. The improved RPD bracket according to claim 1, characterized in that: The base simulating gum tissue is fixed on the bracket body by adhesive.

4. The improved RPD bracket according to claim 1, characterized in that: Also included is a dental crown, which is hollow inside and has an internal hollow structure that matches the abutment tooth preparation.

5. The method for constructing the digital model of the improved RPD bracket according to claim 1, characterized in that: Methods include: Constructing a bracket body model: constructing an RPD bracket model on the dentition model, wherein the RPD bracket model is provided with an edentulous area (2) and a fixing part, a prepared abutment tooth (3) is constructed in the edentulous area, and a labial part and a lingual part are constructed on both sides of the prepared abutment tooth (3); Starting from the neck edge of the abutment tooth preparation, the labial and lingual parts are cut downwards, so that the exposed part of the neck edge of the abutment tooth preparation is increased, and the thickness of the labial and lingual parts is thinned, and then the labial part is cut inwards, so that the width of the labial part is smaller than the width of the lingual part, and the labial part of the edentulous area is provided with a tooth-shaped groove, and the lingual part is provided with a mounting groove, and the area of ​​the cut part forms a reserved space for mounting a base plate simulating gingival tissue; Alternatively, the labial part is cut downward from the neck edge of the abutment tooth preparation, so that the exposed part of the neck edge of the abutment tooth preparation is increased and the thickness of the labial part is thinned, and then at least one mounting hole is opened in the labial part, and the area of ​​the cut part forms a reserved space for mounting a base for simulating gingival tissue; Constructing a base model simulating gum tissue: constructing a base model simulating gum tissue in the reserved space; Construct a crown model: Construct a crown model on the abutment preparation.

6. The method for making the improved RPD bracket according to claim 1, characterized in that: include: Construct digital models of various parts; The bracket body is made using 3D printing technology; Using gum-colored resin blanks and crown-colored resin blanks as raw materials, the base and sub-crown simulating gum tissue are made by CNC cutting method; Then the bracket body, the base simulating the gum tissue and the crown are assembled.

7. The method for making the improved RPD bracket according to claim 6, characterized in that: include: The bracket body, the base simulating the gum tissue and the crown are assembled by adhesive bonding.

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