CN215384772U

CN215384772U - Digital design full casting half-crown type clearance retainer

Info

Publication number: CN215384772U
Application number: CN202120593232.8U
Authority: CN
Inventors: 苏红如; 刘叶飞; 钱文昊
Original assignee: SHANGHAI XUHUI DISTRICT DENTAL CENTER
Current assignee: SHANGHAI XUHUI DISTRICT DENTAL CENTER
Priority date: 2021-03-23
Filing date: 2021-03-23
Publication date: 2022-01-04
Anticipated expiration: 2031-03-23

Abstract

The utility model discloses a digital design full casting half-crown type clearance retainer, which comprises a half crown and a support steel wire, wherein the inner side of the half crown is matched with the shape of an abutment, the support steel wire is a U-shaped casting metal steel wire, and the support steel wire is parallel to an arch of a missing tooth clearance. The utility model 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. The bonding area is increased by adopting a half-crown type to improve the bonding strength. 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 half-crown type clearance retainer

Technical Field

The utility model relates to the field of oral cavity clinical instruments for children, in particular to a digital design full-casting half-crown type clearance retainer.

Background

In the process of growth and development of children, because of serious caries, periapical periodontitis, abnormal eruption of permanent teeth, 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 cannot be completely matched and are easy to deform, and the problems that gum inflammation is caused by pressing gum, the bonding failure is caused by small overlarge bonding surface between the belt ring and the abutment, the gap is maintained to be failed due to 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 generated by movements of the tongue, resultant biting force, cheek muscles and teeth themselves during biting during oral cavity movement, and the space retainers are generally used for more than one year, and a part of the 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.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a digitally-designed full-casting half-crown type space retainer which is simple and convenient in clinical operation, simple in structure, comfortable to wear, not easy to deform and damage, more attached to teeth on two sides of a tooth lacking gap, large in bonding area, not easy to fall off and capable of accurately retaining the tooth lacking gap, so that the problems in the background technology are solved.

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

a digital design full casting half crown type clearance retainer comprises a half crown and a supporting steel wire, wherein the inner ring of the half crown is matched with the shape of an abutment, the supporting steel wire is a U-shaped metal rod, two ends of the U-shaped supporting steel wire are connected with the half crown, the head of the U-shaped supporting steel wire is contacted with a supporting tooth, and the shape of the U-shaped supporting steel wire is matched with the shape of the supporting tooth close to the clearance side.

Preferably, the half crown and the supporting steel wire are made of cobalt-chromium alloy, nickel-chromium alloy or titanium alloy.

Preferably, the half crown and the support wire are of an integrally cast and integrally formed structure.

Preferably, the half crown occlusal surface avoids the occlusal point of the abutment teeth, and the lower edge of the half crown is at least 1mm higher than the gingival margin.

Preferably, the thickness of the half crown is 0.5mm, and the diameter of the supporting steel wire is 1 mm.

Preferably, the support wire is parallel to an arch of the edentulous space.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model 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 front view of the present invention;

FIG. 3 is a top view of the present invention;

in the figure: 1-half crown; 2-supporting the steel wire; 3-an abutment; 4-supporting teeth.

Detailed Description

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

Referring to fig. 1-3, a digital design full casting half crown type space keeper comprises a half crown 1 and a supporting steel wire 2, wherein the inner ring of the half crown 1 is matched with the shape of an abutment, the occlusal surface avoids the occlusal point of the abutment, the supporting steel wire 2 is a U-shaped metal rod, two ends of the U-shape are connected with the half crown, the head of the U-shape is contacted with a supporting tooth, and the shape of the U-shape is matched with the shape of the supporting tooth close to the gap side.

The semi-crown 1 and the supporting steel wire 2 are made of cobalt-chromium alloy, nickel-chromium alloy or titanium alloy, and the semi-crown 1 and the supporting steel wire 2 are of an integrally cast and integrally formed structure. Half crown 1 covers the abutment, and the occlusal surface avoids the abutment bite closes the point, and the lower edge is higher than gingival margin 1mm at least. The thickness of the half crown 1 is 0.5mm, the half crown 1 is attached to the shape of the abutment tooth body, and the surface is highly polished. The support wire is a U-shaped metal bar, the cross section of which is circular with the diameter of 1.5 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.

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; a half-crown type space retainer which can be designed on a three-dimensional oral cavity model.

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 an infant patient, increased in binding power, not easy to fall off, beneficial to prolonging the service life of the gap retainer and capable of accurately keeping the edentulous gap.

Claims

1. The utility model provides a half crown formula space holder of digital design full casting which characterized in that comprises half crown (1), support steel wire (2) two parts, the inner circle and the abutment (3) form phase-match of half crown (1), support steel wire (2) are the metal pole of a U-shaped, and the both ends of supporting steel wire (2) U-shaped are connected with half crown (1), and the head of supporting steel wire (2) U-shaped contacts with supporting tooth (4), and its form and supporting tooth (4) are by the form phase-match of gap side.

2. The digitally designed fully cast half-crown type lash-holder according to claim 1, characterized in that the half-crown (1) and the support wire (2) are both of cobalt chrome, nickel chrome or titanium alloy.

3. Digitally designed fully cast half-crown type lash-holder according to claim 1 or 2, characterized in that the half-crown (1) and the support wire (2) are of one-piece cast one-piece construction.

4. Digitally designed fully cast half-crown type space holder according to claim 1 or 2, characterized in that the occlusal surface of the half-crown (1) avoids the occlusal point of the abutment (3), the lower edge of the half-crown (1) being at least 1mm above the gingival margin.

5. Digitally designed fully cast half-crown type lash-holder according to claim 1 or 2, characterized in that the half-crown (1) has a thickness of 0.5mm and the support wire (2) has a diameter of 1 mm.

6. Digitally designed full cast semi-crown type space holder according to claim 1 or 2, characterized in that the support wires (2) are parallel to the arch of the edentulous space.