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CN-122005122-A - Layered silicon rubber composite guide plate indirectly bonded by self-locking bracket and manufacturing method thereof

CN122005122ACN 122005122 ACN122005122 ACN 122005122ACN-122005122-A

Abstract

The invention belongs to the technical field of orthodontic, and discloses a layered silicone rubber composite guide plate indirectly bonded by self-locking brackets and a manufacturing method thereof, wherein the guide plate is formed by tightly combining a transparent middle body layer of an inner layer and a heavy body layer of an outer layer; the transparent middle body layer is formed by solidifying addition-type silicon rubber with light transmittance more than or equal to 85 percent and wraps the bracket and the lip side of the dental crown, the heavy body layer is formed by solidifying high-hardness silicon rubber with Shore hardness more than or equal to Shore A80, covers the middle body layer and extends to the cutting end and the lingual side of the dental crown to form a rigid support and three-point positioning structure, and the manufacturing method is characterized in that the rheological time sequence control and the hydraulic infiltration locking are realized, namely the heavy body layer is covered after the transparent middle body layer enters the thixotropic peak period and vertical pressure is applied, and the heavy body layer is utilized to force the middle body material to flow for the second time and densely fill into the inverted concave of the bracket. The invention utilizes the commercially available or self-made high-performance silicon rubber, ensures the photocuring efficiency through a layered structure and a rheological process, realizes the gapless mechanical interlocking of the guide plate and the bracket, and solves the problems of low positioning precision and insufficient retention force of the traditional guide plate.

Inventors

  • GAO YANG
  • LI DEHAI

Assignees

  • 中国海洋大学

Dates

Publication Date
20260512
Application Date
20260316

Claims (9)

  1. 1. The layered silicon rubber composite guide plate indirectly bonded by the self-locking bracket is characterized by comprising a transparent middle body layer and a heavy body layer, wherein the transparent middle body layer is an inner layer; The transparent middle body layer is wrapped around the bracket body, the bracket bottom plate and the dental crown labial area, and is made of an addition type silicon rubber material with light transmittance of more than or equal to 85% after solidification; The heavy body layer is tightly covered on the outer surface of the transparent middle body layer and extends to cover the cutting end of the dental crown and the lingual area to form a rigid support and three-point positioning structure of the transparent middle body layer, and the heavy body layer is made of an addition type silicon rubber material with Shore hardness of more than or equal to Shore A80 after being solidified; The transparent middle body layer and the heavy body layer are connected into a whole at a contact interface through chemical crosslinking and curing.
  2. 2. The self-ligating bracket indirectly bonded layered silicone rubber composite guide plate of claim 1, wherein the transparent middle body layer has an average thickness of 1.5mm to 2.5mm, an elongation at break after curing of 280% to 350%, and the heavy body layer has an average thickness of 5mm to 10mm, and a linear shrinkage after curing of less than 0.2%.
  3. 3. The layered silicone rubber composite guide plate indirectly bonded by the self-locking bracket according to claim 1, wherein the transparent middle body layer is made of a silicone rubber material containing vinyl-terminated polydimethylsiloxane and fumed silica filler, the heavy body layer is made of a silicone rubber material containing high-viscosity polydimethylsiloxane and inorganic mineral filler, and the transparent middle body layer and the heavy body layer are cured through hydrosilylation reaction.
  4. 4. The self-ligating bracket indirectly bonded layered silicone rubber composite guide plate of claim 1 wherein the rigid support structure formed by the heavy body layer extends to the lingual or palate side of the dentition with a continuous coating at the coronal cut end providing mechanical retention of the guide plate in place with the undercut of the tooth anatomy.
  5. 5. The method for manufacturing the layered silicone rubber composite guide plate indirectly bonded by the self-locking bracket according to any one of claims 1 to 4, which is characterized by comprising the following steps: s1, model pretreatment, namely coating a separating agent on the surface of a dental model provided with a bracket and drying; S2, coating the transparent middle body layer, namely mixing the raw materials of the transparent middle body layer and coating the raw materials on the surfaces of the bracket and the dental crown pretreated in the step S1; s3, controlling rheological time sequence, namely standing and waiting until the surface of the transparent middle body layer is delustered and enters a thixotropic peak period after the coating in the step S2 is finished; s4, hydraulic infiltration locking and heavy body construction, namely after mixing raw materials of a heavy body layer, covering the surface of the transparent middle body layer which is in a thixotropic peak period after being processed in the step S3, applying vertical pressure, forcing the transparent middle body layer to flow for the second time by utilizing the high viscosity of the heavy body layer and filling the transparent middle body layer into the undercut of the bracket, and then shaping and extending the heavy body layer; S5, synchronously solidifying and separating, namely standing, after the double-layer structure formed in the step S4 is synchronously subjected to chemical crosslinking solidification, immersing the solidified whole body into water for water bath treatment, and taking the composite guide plate off the dental model after interface resistance is reduced by utilizing water film lubrication.
  6. 6. The self-ligating bracket indirectly bonded layered silicone rubber composite guide plate and the manufacturing method thereof according to claim 5, wherein the standing waiting time in the step S3 is 15 seconds to 20 seconds, and the standing waiting time is used for enabling the transparent middle body layer to establish a preliminary thixotropic network so as to prevent excessive loss of the middle body material when the pressure is applied in the step S4.
  7. 7. The method for manufacturing the laminated silicon rubber composite guide plate indirectly bonded with the self-locking bracket according to claim 5, wherein the vertical pressure in the step S4 is in a pressure range of 0.05MPa to 0.15MPa, the pressing duration is 5 seconds to 10 seconds, and the hydraulic penetration locking means that under the action of pressure, the heavy body layer is used as a pressure transmission medium to force the transparent middle body layer in a thixotropic peak period to form a mechanical interlocking with the bracket bottom plate and the wing part inverted concave without gaps, and interface bubbles are discharged.
  8. 8. The layered silicone rubber composite guide plate indirectly bonded by the self-locking bracket and the manufacturing method thereof according to claim 5, wherein the synchronous curing time in the step S5 is 5 minutes to 8 minutes, and the curing environment temperature is controlled at 23 ℃ plus or minus 2 ℃.
  9. 9. The method for manufacturing the layered silicone rubber composite guide plate indirectly bonded by the self-locking bracket according to claim 5, wherein the step S5 is characterized in that the composite guide plate is removed from the dental model by a layered removal method or an integral prying removal method; The integral prying and removing method is to pry the transparent middle body layer and the heavy body layer as a whole by using the appliance at the labial side or adjacent gap of the dental crown and taking the tooth surface as a pivot point so as to separate the transparent middle body layer and the heavy body layer from the dental model.

Description

Layered silicon rubber composite guide plate indirectly bonded by self-locking bracket and manufacturing method thereof Technical Field The invention relates to the technical field of orthodontic treatment, in particular to a layered silicone rubber composite guide plate indirectly bonded by self-locking brackets and a manufacturing method thereof. Background With the development of orthodontic techniques, bracket bonding techniques for securing appliances have undergone an evolution from direct bonding to indirect bonding. The indirect bonding technology is that the bracket is accurately positioned on the dental model of the patient in advance, the transfer guide plate containing the position information of the bracket is manufactured, and then the bracket is integrally transferred into the mouth of the patient in an operation mode, compared with the traditional direct bonding in the mouth, the indirect bonding technology can more accurately control the shaft inclination, the torque angle and the height of the bracket on the tooth surface, effectively reduce the workload of bending and adjusting the later-stage arch wire, obviously shorten the time of the mouth of the chair side of the patient, and improve the efficiency and the comfort level of orthodontic treatment. In current clinical practice and craftsman operation, the materials of construction of the transfer guide mainly include hot-pressed film and medical silicone rubber. Among them, silicone rubber materials are widely used for indirect transfer from a bracket due to their excellent detailed replicability and elastic recovery. The conventional operation flow is to finish the tooth arrangement of the bracket on the plaster model, then allocate and add the silicon rubber material to cover the bracket and the dentition, and trim the edge to form the guide plate after the material is crosslinked and solidified. In the clinical application stage, doctor AB glue is respectively coated on the tooth surface of a patient and the surface of a bracket, pressed for three minutes for bonding, and cut silicon rubber to remove the guide plate to finish transfer. However, the conventional silicone rubber transfer guide has a contradiction that the material properties are difficult to be compatible in practical application. First, the silicone rubber weight has no light transmission and the prior art usually needs to be matched with a chemical curing adhesive (such as AB glue). However, not only is the operating time difficult to precisely control, but also the chemical curing system is not compatible with the photo-curing adhesive systems widely used in orthodontic clinics, which increases the complexity and cost of material management. If a doctor wants to use a photo-curing adhesive to finish bracket bonding, the main part of the guide plate material needs to have higher light transmittance, but the silicon rubber matrix (silicon rubber midbody) with high light transmittance is usually lower in hardness and modulus, and is extremely easy to generate elastic deformation when being peeled off from a plaster model or pressed in place in a patient mouth, so that insufficient rigid support can not be provided, the bracket position is slightly changed in the transferring process, the final positioning precision is influenced, even the bonding cannot be realized, and the balance between the light transmittance curing efficiency and the rigid positioning precision is difficult to be effectively solved in a single material system or a conventional manufacturing process. Disclosure of Invention The technical problem solved by the invention is that the traditional guide plate has no light transmittance, a photo-curing adhesive cannot be used, deformation is easy to occur in the transfer process due to insufficient rigidity of the guide plate material with light transmittance, and the success rate and the efficiency of orthodontic clinical bonding are finally reduced. In order to solve the problems, the invention provides the following technical scheme: In a first aspect, the invention provides a layered silicone rubber composite guide plate indirectly bonded by a self-locking bracket, wherein the composite guide plate is formed by tightly combining a transparent middle body layer of an inner layer and a heavy body layer of an outer layer; The transparent intermediate layer is formed by solidifying addition type silicon rubber with light transmittance more than or equal to 85%, the transparent intermediate layer surrounds the bracket body, the bracket bottom plate and the dental crown labial area, and the transparent intermediate layer has medium-low viscosity and thixotropy before solidification; the weight layer is formed by curing addition type silicon rubber with Shore hardness being greater than or equal to Shore A80, the weight layer is tightly covered on the outer surface of the transparent middle body layer and extends to cover the cutting end of the dental crown