CBCT (cone beam computed tomography)-guided 3D (three-dimensional) printing personalized distal guide plate gap retainer

Abstract

The utility model relates to the technical field of oral medical treatment for children, in particular to a CBCT (cone beam computed tomography) guided 3D (three-dimensional) printing personalized distal guide plate gap retainer, which comprises an abutment fixing sleeve and a distal guide plate vertical plate, a mounting mechanism is arranged between the abutment fixing sleeve and the distal guide plate vertical plate, and anti-licking mechanisms are arranged on the inner sides of the abutment fixing sleeve and the distal guide plate vertical plate. The abutment fixing sleeve and the distal guide plate vertical plate are formed by 3D personalized printing under the guidance of CBCT (cone beam computed tomography), the abutment fixing sleeve can be accurately matched with the anatomical form of an abutment, the distal guide plate is ensured to be perfectly attached to the mesial adjacent surface of an ungerminated first permanent molar of a child, and the abutment fixing sleeve is sleeved on the abutment, so that the abutment fixing sleeve can be used for fixing the first permanent molar of the child. Then, a rotating rod is screwed to drive a driving bevel gear and a driven bevel gear to rotate in a meshed mode, a lead screw rotates to push a hollow pipe to move outwards, a vertical plate of a distal guide plate is pushed to move to the mesial adjacent face where a first permanent molar is not germinated for installation, and the gap length of a gap retainer can be finely adjusted along with child development.

Description

Technical Field

[0001] This utility model relates to the field of pediatric oral medical technology, and in particular to a CBCT-guided 3D-printed personalized distal guide plate gap maintainer. Background Technology

[0002] Premature loss of deciduous molars leading to interdental space loss is closely related to the eruption status of the first permanent molar. During normal physiological processes, the distal surface of the second deciduous molar guides the eruption of the first permanent molar. If the first permanent molar is missing, and the first molar is still erupting and not yet fully occluded, its mesial pushing force causes significant interdental space loss at the site of premature deciduous tooth loss, resulting in a shortened dental arch. Interdental space loss due to premature loss of the second deciduous molar is more common than that due to the first deciduous molar. The incidence of malocclusion in the permanent dentition caused by premature deciduous tooth loss is 3-4 times higher than in children with normal permanent tooth replacement. Furthermore, interdental space management in children is closely related to the timing of tooth loss; the younger the age at which deciduous teeth are lost, the more likely it is to cause adjacent teeth to tilt and the interdental space to narrow, increasing the probability of crowding and the incidence of malocclusion. To prevent adjacent teeth from tilting towards the gap and opposing teeth from elongating after premature deciduous tooth loss, current clinical practice uses distal guide plate space maintainers to maintain the horizontal and vertical interdental spaces of the lost deciduous teeth, ensuring the smooth eruption of the succeeding permanent teeth.

[0003] Currently, the most common method is to use the first deciduous molar as the abutment tooth, with a cast or prefabricated metal crown as the retention component. A curved guide plate is welded to the distal end of the crown, and the vertical part of the guide plate is inserted into the alveolar socket of the distal root or distal buccal root of the second deciduous molar, fitting against the mesial surface of the unerupted first permanent molar to maintain the space for premature loss of the second deciduous molar. However, this method is mostly manufactured as a single piece on a model, and cannot be adjusted during clinical fitting. It requires high precision, but errors often lead to fitting failures and space loss. Furthermore, as children grow, the spacing of the distal guide plate may change slightly, requiring removal and remaking, which is inconvenient for later treatment and maintenance. In daily life, children may habitually lick the missing tooth area due to tooth loss, which can affect the normal growth of the permanent tooth. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a CBCT-guided 3D-printed personalized distal guide plate gap maintainer, which solves the technical problems of existing distal guide plates lacking flexibility, being difficult to install, and inconvenient for later treatment and maintenance. It achieves the goal of easy installation and fine-tuning according to the child's growth and development.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a CBCT-guided 3D-printed personalized distal guide plate gap maintainer, including an abutment tooth fixing sleeve and a distal guide plate vertical plate, wherein an installation mechanism is provided between the abutment tooth fixing sleeve and the distal guide plate vertical plate to facilitate the installation of the gap maintainer, and an anti-licking mechanism is provided on the inner side of the abutment tooth fixing sleeve and the distal guide plate vertical plate to prevent children from licking the missing tooth area.

[0006] The installation mechanism includes an adjustment box installed between the abutment tooth fixing sleeve and the distal guide plate vertical plate. A rotating rod is rotatably connected in a rotating hole at the top of the adjustment box. An active bevel gear is installed at the bottom of the rotating rod inside the adjustment box. Driven bevel gears that mesh with the active bevel gears are symmetrically installed on both sides of the adjustment box. A lead screw is rotatably connected to the rotating holes on both sides of the adjustment box on the driven bevel gear. Hollow tubes are sleeved on the lead screws, and the other ends of the two hollow tubes are respectively connected to the abutment tooth fixing sleeve and the distal guide plate vertical plate.

[0007] A further improvement is that the hollow tube has an internal thread that matches the lead screw, and both lead screws have symmetrical slots, and the top of the rotating rod has a cross groove.

[0008] A further improvement is that the mounting mechanisms are all located above the child's missing tooth tissue surface, with a spacing of 1-2 mm.

[0009] A further improvement is that the abutment tooth fixing sleeve is an irregular ring structure that fits the shape of the child's abutment tooth, and a buckle plate is installed on the inner side of its top. The distal guide plate vertical plate is a combination of an upper arc surface structure and a bottom arc surface plate structure.

[0010] A further improvement is that the anti-licking mechanism includes side baffles installed on the back side of the abutment tooth fixing sleeve and the distal guide plate vertical plate, and a sliding plate is slidably connected in the grooves opened in the two side baffles.

[0011] A further improvement is that the abutment tooth fixing sleeve, the distal guide plate vertical plate, the side baffle and the slide plate are all 3D printed in a personalized manner under CBCT guidance, and the edges of the side baffle and the slide plate are all chamfered.

[0012] By employing the above technical solution, this utility model provides a CBCT-guided 3D-printed personalized distal guide plate gap retainer, which has at least the following beneficial effects:

[0013] 1. This utility model improves installation efficiency and provides precise positioning by placing the abutment tooth fixing sleeve on the child's erupted adjacent tooth, then turning the rotating rod to drive the active bevel gear to rotate, which in turn drives the driven bevel gear to rotate, thereby causing the lead screw to rotate and push the hollow tube to move outward, which in turn pushes the distal guide plate vertical plate to the mesial proximal surface of the child's unerupted first permanent molar for installation.

[0014] 2. When the groove on the lead screw leaks out from the hollow tube, it indicates that the distal guide plate vertical plate is already located on the mesial proximal surface of the child's unerupted first permanent molar, thus avoiding excessive adjustment of the initial gap between the abutment tooth fixing sleeve and the distal guide plate vertical plate, which could cause discomfort to the child.

[0015] 3. The abutment tooth fixation sleeve and the distal guide plate vertical plate of this utility model are 3D printed in a personalized manner under CBCT guidance. The abutment tooth fixation sleeve can accurately fit the anatomical shape of the child's abutment tooth, accurately locate the unerupted first permanent molar, and ensure that the distal guide plate vertical plate can perfectly fit the mesial proximal surface of the child's unerupted first permanent molar, improving the comfort and accuracy of wearing, reducing gaps, and avoiding food residue retention that may affect oral health.

[0016] 4. This utility model uses a side baffle and a sliding plate to seal the missing tooth from the inside of the mouth, preventing children from frequently licking the missing tooth and affecting the eruption of permanent teeth. Attached Figure Description

[0017] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0018] In the attached diagram:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a top-view structural diagram of the present invention;

[0021] Figure 3 This is a partially enlarged structural diagram of the installation mechanism of this utility model;

[0022] Figure 4 This is a cross-sectional view of the internal structure of the installation mechanism of this utility model.

[0023] In the diagram: 1. Abutment tooth fixation sleeve; 2. Distal guide plate vertical plate;

[0024] 3. Mounting mechanism; 31. Adjusting box; 32. Rotating rod; 33. Driving bevel gear; 34. Driven bevel gear; 35. Lead screw; 36. Hollow tube;

[0025] 4. Anti-licking mechanism; 41. Side panel; 42. Slide board. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1

[0028] Given the current limitations of existing 3D-printed teeth, which completely cover missing teeth and negatively impact subsequent permanent tooth growth, and the lack of stable fixation leading to easy detachment, this embodiment provides a CBCT-guided 3D-printed personalized distal guide plate space maintainer. Please refer to... Figures 1-4 This CBCT-guided 3D-printed personalized distal guide plate space maintainer can maintain space stably for a long time. It includes an abutment tooth fixing sleeve 1 and a distal guide plate vertical plate 2. An installation mechanism 3 is provided between the abutment tooth fixing sleeve 1 and the distal guide plate vertical plate 2 to facilitate the installation of the space maintainer. An anti-licking mechanism 4 is provided on the inner side of the abutment tooth fixing sleeve 1 and the distal guide plate vertical plate 2 to prevent children from licking the missing tooth area. The abutment tooth fixing sleeve 1 is placed on the child's erupting adjacent tooth through the installation mechanism 3. Then, the bottom of the distal guide plate vertical plate 2 is installed on the mesial surface of the child's unerupted first permanent molar, thereby maintaining the space at the missing tooth area. This prevents mesial displacement of the permanent tooth, guides the permanent tooth to erupt from the correct position, and, together with the anti-licking mechanism 4, prevents children from habitually licking the missing tooth area, thus avoiding affecting the eruption and growth of the permanent tooth.

[0029] Because existing technologies that use 3D-printed teeth to completely cover the missing tooth area affect the subsequent growth of permanent teeth, and the fixation is not stable enough and is relatively easy to fall off, this device is equipped with an installation mechanism 3. The installation mechanism 3 includes an adjustment box 31 installed between the abutment tooth fixing sleeve 1 and the distal guide plate vertical plate 2. A rotating rod 32 is rotatably connected in a rotating hole opened at the top of the adjustment box 31. An active bevel gear 33 is installed at the bottom of the rotating rod 32 and inside the adjustment box 31. A driven bevel gear 34 is symmetrically installed on both sides inside the adjustment box 31 and meshes with the active bevel gear 33. A lead screw 35 is installed on the driven bevel gear 34 and rotatably connected in a rotating hole opened on both sides of the adjustment box 31. A hollow tube 36 is sleeved on the lead screw 35, and the other ends of the two hollow tubes 36 are respectively connected to the abutment tooth fixing sleeve 1 and the distal guide plate vertical plate 2.

[0030] The hollow tube 36 has an internal thread that matches the lead screw 35, and both lead screws 35 have symmetrical slots. The top of the rotating rod 32 has a cross groove. The abutment tooth fixing sleeve 1 is placed on the child's erupted adjacent tooth. Then, a medical screwdriver is used to engage with the cross groove on the top of the rotating rod 32. Turning the rotating rod 32 drives the active bevel gear 33 to rotate, which in turn drives the driven bevel gear 34 to rotate. This causes the lead screw 35 to rotate and push the hollow tube 36 outward, thereby pushing the distal guide plate vertical plate 2 to the mesial proximal surface of the child's unerupted first permanent molar. When the slot on the lead screw 35 is exposed, it indicates that the distal guide plate vertical plate 2 has been fitted to the mesial proximal surface of the child's unerupted first permanent molar, avoiding excessive pushing and causing discomfort to the child.

[0031] To avoid the mounting mechanism 3 from obstructing the growth of permanent teeth, the mounting mechanisms 3 in this device are all located above the surface of the child's missing tooth tissue, with a spacing of 1-2 mm, thus reserving sufficient space to ensure that the child's permanent teeth can erupt normally.

[0032] The abutment tooth fixing sleeve 1 is an irregular ring structure that fits the shape of the child's abutment tooth, and a buckle plate is installed on the inner side of its top. The distal guide plate vertical plate 2 is composed of an upper arc surface structure and a bottom arc plate structure. The bottom arc plate structure of the distal guide plate vertical plate 2 is placed against the mesial proximal surface of the child's unerupted first permanent molar to prevent mesial displacement of the permanent tooth. Together with the arc plate structure at the top, it guides the permanent tooth to erupt from the correct position.

[0033] The abutment tooth fixation sleeve 1, the distal guide plate vertical plate 2, the side baffle 41, and the slide plate 42 are all 3D printed in a personalized manner under CBCT guidance. It can accurately adapt to the anatomical shape of the child's missing tooth site, accurately locate the unerupted first permanent molar, and ensure that the distal guide plate vertical plate 2 can perfectly fit the mesial proximal surface of the child's unerupted first permanent molar, improving the comfort and accuracy of wearing, reducing gaps, and avoiding food residue retention that may affect oral health. In addition, the edges of the side baffle 41 and the slide plate 42 are rounded and chamfered to avoid scratching the child's mouth.

[0034] Example 2

[0035] Because children have limited self-control, they may lick the area where a tooth is missing, which could affect the eruption and growth of the permanent tooth. Therefore, based on Example 1, if... Figures 1-4 As shown, the device is also equipped with an anti-licking mechanism 4. The anti-licking mechanism 4 includes side baffles 41 installed on the back side of the abutment tooth fixing sleeve 1 and the distal guide plate vertical plate 2. The slide plate 42 is slidably connected in the grooves opened in the two side baffles 41. As the abutment tooth fixing sleeve 1 and the distal guide plate vertical plate 2 are attached to the child's adjacent teeth, the side baffles 41 are driven to slide off the slide plate 42. Thus, the side baffles 41 and the slide plate 42 seal the missing tooth from the inside of the mouth, preventing the child from frequently licking the missing tooth and affecting the eruption of the permanent tooth.

[0036] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A CBCT-guided 3D-printed personalized distal guide plate gap maintainer, comprising an abutment tooth fixing sleeve (1) and a distal guide plate vertical plate (2), characterized in that: An installation mechanism (3) is provided between the abutment tooth fixing sleeve (1) and the distal guide plate vertical plate (2) to facilitate the installation of a gap maintainer. An anti-licking mechanism (4) is provided on the inner side of the abutment tooth fixing sleeve (1) and the distal guide plate vertical plate (2) to prevent children from licking the missing tooth area. The installation mechanism (3) includes an adjustment box (31) installed between the abutment tooth fixing sleeve (1) and the distal guide plate vertical plate (2). A rotating rod (32) is rotatably connected in a rotating hole at the top of the adjustment box (31). An active bevel gear (33) is installed at the bottom of the rotating rod (32) and inside the adjustment box (31). A driven bevel gear (34) meshing with the active bevel gear (33) is symmetrically installed on both sides inside the adjustment box (31). A lead screw (35) rotatably connected in a rotating hole on both sides of the adjustment box (31) is installed on the driven bevel gear (34). A hollow tube (36) is sleeved on the lead screw (35). The other ends of the two hollow tubes (36) are connected to the abutment tooth fixing sleeve (1) and the distal guide plate vertical plate (2) respectively.

2. The CBCT-guided 3D-printed personalized distal guide plate gap maintainer according to claim 1, characterized in that: The hollow tube (36) is provided with an internal thread that matches the lead screw (35), and both lead screws (35) are provided with symmetrical slots. The top of the rotating rod (32) is provided with a cross groove.

3. The CBCT-guided 3D-printed personalized distal guide plate gap maintainer according to claim 1, characterized in that: The installation mechanisms (3) are all located above the missing tooth tissue surface of the child, with a spacing of 1-2 mm.

4. The CBCT-guided 3D-printed personalized distal guide plate gap maintainer according to claim 1, characterized in that: The abutment tooth fixing sleeve (1) is an irregular ring structure that fits the shape of the child's abutment tooth, and a buckle plate is installed on the inner side of its top. The distal guide plate vertical plate (2) is a combination of an upper arc surface structure and a bottom arc surface plate structure.

5. A CBCT-guided 3D-printed personalized distal guide plate gap maintainer according to claim 1, characterized in that: The anti-licking mechanism (4) includes side baffles (41) installed on the back side of the abutment tooth fixing sleeve (1) and the distal guide plate vertical plate (2), and a sliding plate (42) is slidably connected in the grooves opened in the two side baffles (41).

6. A CBCT-guided 3D-printed personalized distal guide plate gap maintainer according to claim 5, characterized in that: The abutment tooth fixing sleeve (1), the distal guide plate vertical plate (2), the side baffle (41), and the slide plate (42) are all 3D printed in a personalized manner under CBCT guidance, and the edges of the side baffle (41) and the slide plate (42) are all chamfered.

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