CN111888017A

CN111888017A - Digital design full-casting type clearance retainer and manufacturing method thereof

Info

Publication number: CN111888017A
Application number: CN202010877527.8A
Authority: CN
Inventors: 苏红如; 钱文昊; 刘叶飞
Original assignee: SHANGHAI XUHUI DISTRICT DENTAL CENTER
Current assignee: SHANGHAI XUHUI DISTRICT DENTAL CENTER
Priority date: 2020-08-27
Filing date: 2020-08-27
Publication date: 2020-11-06

Abstract

The invention discloses a digital design full casting type clearance retainer and a manufacturing method thereof, the digital design full casting type clearance retainer comprises a belt ring, a supporting rod and a supporting head, the inner ring of the belt ring is matched with the shape of a prepared abutment, the supporting head is an oblong curved metal plate, the inner side of the curved surface of the supporting head is matched with the shape of the side, close to the gap, of the supporting tooth, the belt ring is connected with the supporting head through the supporting rod, and the supporting rods are arranged in parallel to the direction of a dental arch. The invention saves the steps of trying to wear a ring and taking an impression in the mouth, reduces the discomfort of the infant, simplifies the clinical operation, is beneficial to improving the matching degree of the infant and improves the clinical operation efficiency. The investment pattern manufactured by digital design and 3D printing technology is completely attached to the tooth patterns on two sides of the edentulous gap, which is beneficial to accurately maintaining the edentulous gap. Because of the integral casting of the alloy, the alloy has higher strength and is not easy to deform, thereby being beneficial to prolonging the service life of the clearance retainer and reducing the clearance retaining failure caused by the deformation of the belt ring.

Description

Digital design full-casting type clearance retainer and manufacturing method thereof

Technical Field

The invention relates to the field of oral cavity clinical instruments for children, in particular to a digital design full-casting type clearance retainer and a manufacturing method thereof.

Background

In the process of growth and development of children, because of serious caries, periapical periodontitis, abnormal eruption, congenital deficiency or trauma and the like, the deciduous teeth are usually fallen off or pulled out too early. When deciduous teeth are prematurely lost and permanent teeth can not be erupted in a short period, if gap maintenance is not performed, adjacent teeth on two sides are obliquely displaced towards the gap side, so that the gap between the deficient teeth is reduced, permanent teeth eruption obstacle or ectopic eruption occurs, and even jaw deformity is caused. Therefore, measures are required to maintain the edentulous space for a long period until new permanent teeth erupt. The most widely used method of maintaining the gap is to wear the gap retainer.

The most common prior art is a ring wire coil type of gapping cage, which is formed by welding preformed rings and bent wires. The manufacturing steps of the ring-belt wire ring type clearance retainer are complicated, and the manufacturing steps comprise ring trying, impression taking, plaster model making, clearance retainer designing and manufacturing on the plaster model and the like. Wherein, the trial belt loop and the mould taking are operated and finished in the mouth of the infant, which often causes the discomfort of the infant, and part of the infant can have the condition of nausea, vomiting and even refusal of treatment, thus increasing the difficulty of clinical operation. The alginate material used to make the impression has limited accuracy and is easily deformed, which may result in a decreased accuracy of the plaster model. The gap retainer manufactured by using an inaccurate plaster model has poor matching with the oral anatomical structure of a child patient, and cannot accurately maintain the gap of the missing teeth. Sometimes, the patient can be put on the medical device only after being repeatedly modified, thereby reducing the clinical operation efficiency. In addition, the preformed belt ring and the abutment form can not be completely matched and are easy to deform, and the problems that gum inflammation is caused by pressing gum, bonding failure is caused by overlarge gap between the belt ring and the abutment, gap maintaining failure is caused by deformation of the belt ring and the like can occur in the using process. And the welding part of the steel wire and the belt ring can also be subjected to false welding or poor welding, so that the steel wire falls off, the preservation of gaps is affected, and even the falling steel wire enters the digestive tract or the respiratory tract. The bent steel wire is mostly in line contact with adjacent teeth, is easy to shift and is not beneficial to accurately maintaining the gap between the missing teeth.

The oral cavity-worn space retainers are subjected to repeated multi-directional forces from tongue, occlusal force, buccinator and the movement of the teeth themselves during occlusion during oral movement, and the space retainers are usually used for more than one year, and some space retainers may be used for more than 5 years. In contrast, in the conventional gap retainers, different parts are often connected by using a welding technique, and the welded portions may be detached under repeated complicated stress, resulting in failure of gap retention. Therefore, there is a strong need for a new space maintainer which is relatively simple in clinical operation, less prone to damage, conforms to the tooth morphology, has less irritation to the gum tissue, and is in stable contact with the adjacent tooth surface.

Disclosure of Invention

The invention aims to provide a digital-design full-casting type space retainer which has a simple structure, is comfortable to wear, is not easy to deform and damage, is simple and convenient for clinical operation, is more attached to teeth on two sides of a tooth-missing gap, is beneficial to reducing the difficulty of clinical operation and accurately maintains the tooth-missing gap, and a manufacturing method thereof, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a digital design full casting formula space holder, includes belt ring, supports thick stick and chaplet, the inner circle of belt ring and the abutment form phase-match after preparing, the chaplet is an oblong curved surface metal sheet, and the curved surface inboard of chaplet leans on the form phase-match of gap side with supporting the tooth, be connected through supporting the thick stick between belt ring and the chaplet.

Preferably, the belt ring, the support rod and the support head are all made of cobalt-chromium alloy, nickel-chromium alloy or titanium alloy.

Preferably, the belt ring, the support bar and the stay are of an integrally cast and integrally formed structure.

Preferably, the lower edge of the belt ring is at least 1mm higher than the gingival margin and 1mm lower than the occlusal surface, and the thickness of the belt ring is 0.5 mm.

Preferably, the support bars are two metal bars parallel to the dental arch in the edentulous area, the cross section of each metal bar is a circle with the diameter of 1.5mm, and the thickness of each support bar is 0.5 mm.

Preferably, the support head is an oblong curved metal plate with the thickness of 0.5 mm.

Preferably, the upper boundary of the supporting head is positioned in the middle of the side surface of the supporting tooth, the upper boundary is positioned at least 1mm below the occlusal surface, the lower boundary is positioned at least 1mm above the gum, and the supporting head extends towards the buccal side and the lingual side of the tooth and crosses the axial angle of the buccal side and the lingual side of the tooth by 1 mm.

The manufacturing method of the digital design casting type clearance retainer comprises the following steps:

1) collecting internal information of the oral cavity of the child by an intraoral scanner;

2) importing the scanning information into a computer to form a corresponding three-dimensional oral cavity model;

3) finishing the design of a casting investment of the space retainer on the three-dimensional oral cavity model;

4) printing out the cast resin investment of the lash holder using a 3D printer;

5) and carrying out conventional embedding casting on the casting resin by using a fired mold.

Preferably, the step 1) adopts a digital impression technology, and the specific steps of the method are that an intraoral scanning head of the lapacho model CS3600 is used for extending into the mouth of the infant, the oral cavity of the infant is uniformly scanned, and accurate model data information of the interior of the oral cavity of the child is generated in a computer.

Preferably, the steps 2) and 3) adopt a digital design technology, and the specific steps are that scanning information is imported into a computer, a three-dimensional digital model is drawn by using Geomagicsudio12.0 software, and the design of the space retainer investment is designed on the three-dimensional digital model.

Preferably, the step 4) adopts a 3D printing technology, and the specific steps are to introduce the designed investment pattern data into a Solidscape3D printer, and directly print the cast resin investment pattern by the 3D printing technology.

Compared with the prior art, the invention has the beneficial effects that:

the invention simultaneously uses three digital technologies of digital impression, digital design, 3D printing and the like and an integral casting technology in the design and manufacture process, saves the steps of trying to wear a ring and taking the impression in the mouth, reduces the discomfort of the infant, simplifies the clinical operation, is beneficial to improving the matching degree of the infant and improves the clinical operation efficiency. The investment pattern manufactured by digital design and 3D printing technology is completely attached to the tooth patterns on two sides of the edentulous gap, which is beneficial to accurately maintaining the edentulous gap. Because of the integral casting of the alloy, the alloy has higher strength and is not easy to deform, thereby being beneficial to prolonging the service life of the clearance retainer and reducing the clearance retaining failure caused by the deformation of the belt ring.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a top view of the present invention;

FIG. 3 is a left side view of the present invention;

FIG. 4 is a schematic flow chart of a manufacturing method of the present invention;

in the figure: 1-a belt ring; 2-supporting the bar; 3-support the head.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

Referring to fig. 1-4, a digital design full casting type clearance retainer comprises a ring 1, a support bar 2 and a support head 3, wherein the inner ring of the ring 1 is matched with the prepared abutment shape, the support head 3 is an oblong curved metal plate, the inner side of the curved surface of the support head 3 is matched with the shape of the support tooth near the gap side, and the ring 1 is connected with the support head 3 through the support bar 2.

The material of belt ring 1, support thick stick 2 and chaplet 3 is cobalt chromium alloy, nichrome or titanium alloy, belt ring 1, support thick stick 2 and chaplet 3 are whole casting integrated into one piece structure. The lower edge of the belt ring 1 is at least 1mm higher than the gingival margin, the thickness of the belt ring 1 is 0.5mm lower than the occlusal surface by 1mm, the belt ring 1 is attached to the shape of the tooth body of the abutment, and the surface is highly polished. The supporting bars 2 are two metal bars parallel to the dental arch of the edentulous area, the cross sections of the metal bars are circular with the diameter of 1.5mm, and the thickness of the supporting bars 2 is 0.5 mm. The supporting head 3 is an oblong curved surface metal plate with the thickness of 0.5 mm. Prop the upper boundary of head 3 and be located and support flank middle section, the upper boundary is located below the occlusal surface at least 1mm, and the lower boundary is located gum top at least 1mm, props head 3 and extends to tooth buccal side and lingual side, crosses tooth buccal side and lingual side axial angle 1 mm.

The step 1) adopts a digital impression technology, and the specific steps are that an intraoral scanning head with the model of Ruiko CS3600 is used for extending into the mouth of a child, the oral cavity of the child is uniformly scanned, and accurate model data information of the interior of the oral cavity of the child is generated in a computer. The step 2) and the step 3) adopt a digital design technology, and the specific steps are that scanning information is imported into a computer, a three-dimensional digital model is drawn by using Geomagicsudio12.0 software, and the design of the clearance retainer investment is designed on the three-dimensional digital model. And 4) adopting a 3D printing technology, and specifically, guiding the designed investment pattern data into a Solidscape3D printer, and directly printing the cast resin investment pattern by the 3D printing technology.

Example one

1) the internal information of the oral cavity of the child is collected through an intraoral scanner, intraoral scanning is carried out by using the intraoral scanner of the Ruiko CS3600, uniform scanning is carried out on dentition, dental arch and mucosa in the mouth of the child, the scanning result is recorded and stored in a computer, the intraoral scanner can quickly and accurately obtain the model data information of the internal part of the oral cavity of the child, and the nausea and discomfort caused by the traditional impression paste are avoided;

2) importing the scanning information into a computer to form a corresponding digital three-dimensional oral cavity model, and finishing the design of the investment pattern of the space retainer on the three-dimensional oral cavity model by using Geomagicsudio12.0 software; the types of standoffs that can be designed on the three-dimensional oral model include band/full crown wire loop style standoffs, tongue/jaw arch style standoffs, and some custom designed metal cast standoffs;

3) directly printing the designed casting resin investment pattern of the space retainer by using a Solidscape3D printer after the design is finished;

4) embedding and casting the printed resin casting investment pattern, wherein the alloy used for casting is cobalt-chromium alloy;

5. the space keeper is tried on clinically, and the sick child can wear and leave after trying on proper cementation.

Compared with the traditional gap retainer, the gap retainer simplifies clinical operation, avoids discomfort in the process of taking an impression and trying on a ring, reduces the requirement on the matching of the children, and can be worn away after trying on proper cementation. Is beneficial to improving the clinical diagnosis and treatment efficiency. In addition, the gap retainer is simple and comfortable in structure, firm in material, not easy to deform and damage, higher in matching degree with anatomical structures of teeth on two sides of the edentulous gap, capable of being fully attached to the teeth on two sides of the edentulous gap of the patient child, beneficial to prolonging the service life of the gap retainer and capable of accurately retaining the edentulous gap.

Claims

1. The utility model provides a digital design full casting formula space holder, its characterized in that, includes belt ring (1), supports thick stick (2) and chaplet (3), the inner circle of belt ring (1) and the abutment form phase-match after preparing, chaplet (3) are an oblong curved surface metal sheet, and the curved surface inboard of chaplet (3) and the form phase-match that supports the tooth and lean on the lacuna side, be connected through supporting thick stick (2) between belt ring (1) and the chaplet (3).

2. The digital engineered full cast stand-off as claimed in claim 1, wherein the band (1), support bar (2) and brace (3) are all cobalt chrome, nickel chrome or titanium alloy.

3. The digitally designed fully cast gapping holder of claim 1 or 2, wherein the belt ring (1), support bar (2) and brace head (3) are of an integrally cast one-piece construction.

4. The digitally designed fully cast stand-off according to claim 1 or 2, characterized in that the lower edge of the band (1) is at least 1mm above the gingival margin and 1mm below the occlusal surface, the thickness of the band (1) being 0.5 mm.

5. The digital designed full cast stand-off according to claim 1 or 2, characterized in that the support bars (2) are two metal bars parallel to the dental arch in the edentulous area, the cross-section of which is circular with a diameter of 1.5mm, the thickness of the support bars (2) being 0.5 mm.

6. The digitally designed fully cast type of space holder according to claim 1 or 2, wherein the brace (3) is an oblong curved metal plate with a thickness of 0.5mm, the upper boundary of the brace (3) is located at the medial side of the supporting teeth, the upper boundary is located at least 1mm below the occlusal surface, the lower boundary is located at least 1mm above the gums, and the brace (3) extends to the buccal and lingual sides of the teeth over the axial angle of 1mm of the buccal and lingual sides of the teeth.

7. A method of making a digitally engineered cast cage according to claim 1 or claim 2, comprising the steps of:

8. The method as claimed in claim 7, wherein the step 1) is performed by using a digital impression technique, and comprises the steps of using an intraoral scanning head of the model of Ruiko CS3600 to extend into the mouth of the infant, and uniformly scanning the mouth of the infant to generate accurate model data information of the interior of the mouth of the infant in a computer.

9. The method of claim 7, wherein the steps 2) and 3) are performed using a digital design technique, and the steps include inputting the scan information into a computer, drawing a three-dimensional digital model using Geomagicsudio12.0 software, and designing the design of the mold pattern of the space holder on the three-dimensional digital model.

10. The method of claim 7, wherein step 4) uses 3D printing technology, and the specific steps are to introduce the designed pattern data into a Solidscape3D printer, and directly print the cast resin pattern by 3D printing technology.