CN-122005126-A - Light planting bridge and preparation method thereof

Abstract

The invention relates to the technical field of dental implant restoration, in particular to a lightweight implant bridge and a preparation method thereof. The preparation method comprises the steps of manufacturing an outer layer structure made of hard materials, forming a cavity and at least one injection port communicated with the cavity, injecting a lightweight resin material into the cavity through the injection port, and solidifying the lightweight resin material in the cavity to form an inner layer structure combined with the outer layer structure to obtain the planting bridge frame of the composite structure. The lightweight planting bridge comprises an outer layer structure and an inner layer structure, wherein the outer layer structure is made of hard materials, a cavity is formed in the outer layer structure, at least one injection port communicated with the cavity is formed in the outer layer structure, the inner layer structure is filled in the cavity through the injection port and is solidified in the cavity, and the inner layer structure is made of lightweight resin materials. Thus, the self weight can be reduced and the gradient mechanical cushioning characteristics of the near natural tooth can be simulated or restored while ensuring sufficient supporting strength and connection stability.

Inventors

• YU HAIYANG
• FAN LIUQING
• XIE CHENYANG
• LUO TIAN

Assignees

• 四川大学

Dates

Publication Date

20260512

Application Date

20260408

Claims (10)

1. 1. The preparation method of the lightweight planting bridge is characterized by comprising the following steps of: manufacturing an outer layer structure made of hard materials, wherein the outer layer structure is formed with a cavity and at least one injection port communicated with the cavity; Injecting a lightweight resin material into the cavity through the injection port; And curing the lightweight resin material in the cavity to form an inner layer structure combined with the outer layer structure, so as to obtain the planting bridge frame with the composite structure.
2. 2. The method for manufacturing a lightweight planting bridge as defined in claim 1, wherein the step of manufacturing the outer layer structure with the cavity comprises: Designing a three-dimensional digital model of the outer structure containing the cavity and injection port based on digitized data of the patient's mouth; and forming the outer layer structure by adopting an additive manufacturing process according to the three-dimensional digital model.
3. 3. The method of claim 1, wherein the step of filling the cavity with resin comprises applying vibration or vacuum to the outer layer structure to exclude bubbles from the cavity while or after the step of injecting the lightweight resin material.
4. 4. A method of manufacturing a lightweight planting bridge as claimed in any one of claims 1 to 3 wherein in the step of curing to form a composite structure, the lightweight resin material is a photo-curable resin which is cured by illumination.
5. 5. A lightweight planting bridge, characterized in that the planting bridge is manufactured by the manufacturing method according to any one of claims 1-4, and the planting bridge comprises: an outer layer structure made of hard material, the outer layer structure forming a cavity and having at least one injection port communicating with the cavity, and And an inner layer structure filled and cured in the cavity through the injection port, the inner layer structure being made of a lightweight resin material.
6. 6. The lightweight planting bridge as recited in claim 5, wherein the outer layer structure includes at least two retainers and a connector connecting each of the retainers, the at least one injection port being disposed on the connector.
7. 7. The lightweight planting bridge according to claim 6, wherein screw channels are arranged on the connector and/or the retainer, and the number of the screw channels is equal to the number of the dental implants matched with the planting bridge; and the connector is also provided with a substrate interface, and the substrate interface is communicated with the screw channel.
8. 8. The lightweight planting bridge according to claim 6, wherein the gingival end of the connector is formed with a gingival-retraction base for supporting an artificial gingiva.
9. 9. The lightweight bridge frame according to claim 6, wherein a plurality of injection ports are provided on the lingual side, the palate side or the tissue side of the connector, wherein a distance between adjacent injection ports is 3.0mm to 5.0mm, and a diameter of the injection ports is 1.0mm to 2.0mm.
10. 10. The lightweight planting bridge according to any one of claims 6-9, wherein the retainers are in a full-anatomical configuration; Or the retainer is in a form of a preparation body reserved with a facing space; or the retainers are a combination of a full anatomical form and a preparation form.

Description

Light planting bridge and preparation method thereof Technical Field The invention belongs to the technical field of dental implant restoration, and particularly relates to a lightweight implant bridge and a preparation method thereof. Background Implant repair is a conventional and effective treatment for dentition defects or deletions. In the treatment process, a dental implant (i.e., an artificial tooth root) is generally first surgically implanted into an alveolar bone of a missing tooth region, and after stable osseointegration is formed, the form and function of the missing tooth is restored through an upper restoration structure. The implant bridge is used as a core supporting member connected and fixed on a plurality of implants, and is a foundation for stably installing and long-term functioning of an upper restoration (such as a dental crown and a bridge). Multiple independent implants are connected into a whole through a bridge, and span the missing tooth area, so that a solid attachment platform is provided for the prosthesis above. The implant bridge not only realizes the retention and stability of the prosthesis, but also effectively transmits and redistributes the biting force generated in the chewing movement, so that the load can be relatively and uniformly dispersed to each supporting implant and the bone tissues around the supporting implant, thereby avoiding excessive concentration of stress, and having great significance for maintaining the long-term health of the implant-bone interface, preventing bone absorption around the implant and ensuring the success rate of the long-term stability of the whole repair system. However, the current planting bridge, which is widely used in clinic, especially the bridge with a full solid structure designed for strength pursuing, has several inherent technical defects and limitations in practical application, mainly including the following aspects: 1. In terms of physical properties and biocompatibility, the planting bridge of the full solid structure has larger mass due to compact materials. Studies have shown that the weight can be 3-5 times that of a single natural tooth. Because the weight is large, the oral cavity external force is continuously applied to the muscles around the oral cavity (such as buccinators and lingual muscles) after being worn in the mouth of a patient for a long time, muscle fatigue is easily caused, discomfort of the patient is possibly caused, articulation clarity is possibly affected, and even the original mandibular movement mode is changed. More importantly, the excessively heavy bridge is applied to the implant as a cantilever structure, so that a continuous static load is formed, the risk of mechanical complications of the implant and the internal connecting components thereof, such as loosening, displacement and even breakage of the implant or a repair screw, is increased, and a potential threat is formed to long-term prognosis of the prosthesis. 2. In terms of mechanical properties and stress buffering structures, the inherent biomechanical structures of the existing full-solid homogeneous bridge and natural teeth have fundamental differences. The natural tooth is a double-layer structure formed by wrapping high-hardness enamel around relatively flexible dentin, so that when the natural tooth bears biting force, the wear resistance can be provided by the outer layer, and the relatively flexible inner layer is subjected to micro deformation, so that the effects of buffering stress and preventing crack growth are achieved. Whereas conventional all-solid planting trays are typically constructed of a single homogeneous material, the natural gradient cushioning properties are lost. The high rigidity of the bridge frame can lead the bridge frame to hardly deform when being stressed, and the energy cannot be dissipated through the elastic deformation of the material, so that the stress generated by chewing cannot be effectively dispersed in the bridge frame. As a result, stress is extremely prone to concentration in mechanical weak links, most typically at the junction of the implant bridge and the implant or abutment (neck region), and repeated stress concentrations over a long period of time tend to induce material fatigue in that region, ultimately resulting in cracking or fracture of the bridge neck. 3. In terms of intraoral biomechanical interactions, due to the high rigidity and lack of cushioning properties described above, the fully solid implant bridge can transmit most of the impact forces directly to the opposing teeth with little attenuation when subjected to bite loads. When the jaw is a natural tooth, the hard enamel surface will bear concentrated impact and friction from a rigid bridge for a long time, which accelerates the non-physiological abrasion of the natural enamel of the jaw, and may cause a series of secondary oral problems such as dentin sensitivity, reduced occlusion height and the like. Therefore