CN102499769B - Dentistry bionic radian curve fiber post - Google Patents

Abstract

The invention relates to a dental bionic curved fiber post. Most of the existing dental fiber posts are straight screws, which affect the uniform distribution of stress, and also affect the arrangement and aesthetics of the crown. The fiber post of the present invention is divided into a root inner section and a root outer section; the root inner section is cylindrical; the root outer section is divided into an upper root outer section and a lower root outer section, and the top of the upper root outer section is connected with the root inner section; The bottom of the outer section is connected with the outer section of the lower root; the cross section of the outer section of the upper root is waist-shaped, and its busbar is composed of two tangent arcs, the upper arc section is tangent to the inner section of the root, and the lower arc section is connected to The bus bar of the outer section of the lower root is tangent; the cross section of the outer section of the lower root is waist-shaped. The invention meets the requirements of biomechanics, and has the shape of the root canal post bionically designed according to the biological parameters; it solves the problem that the finished fiber post cannot be bent and its application is limited when repairing the anterior teeth.

Description

A dental bionic curved fiber post

technical field

The invention belongs to the technical field of medical devices, and relates to a dental bionic curved fiber post.

Background technique

Root preservation restorative treatment is an important part of dental restoration and is the only reliable method known to prevent alveolar bone loss. The post-core system is one of the effective means of root preservation and restoration. At present, the post-core system has been widely used in clinical practice, and can be roughly divided into two categories, metal and non-metal, according to different materials. Traditional metal posts have disadvantages such as poor aesthetics, high elastic modulus, increased root fracture probability, and metal corrosion products that easily cause periodontal disease and affect MRI imaging. Non-metallic fiber posts can effectively Distribute stress, prevent root fracture caused by stress concentration; good aesthetics; corrosion resistance; fatigue resistance; Leakage; does not affect imaging examination and many other advantages, it is expected to achieve the best long-term repair effect, showing good clinical application prospects, and has gradually been popularized and applied in clinical practice. At present, almost all of the dental fiber posts used in domestic clinical applications depend on imports, and all of them are straight posts. Clinically, most of the residual roots and crowns that need to be repaired with post-core crowns are mostly due to the uneven arrangement of the teeth, which affects self-cleaning and causes caries, but the roots in the alveolar bone are still in abnormally arranged positions. When restoring anterior teeth, the use of straight posts will not only cause the outer root of the post to protrude excessively to the labial side, which will affect the uniform distribution of stress, but also affect the arrangement and appearance of the crown. If the length of the outer section of the root of the post is shortened to prevent its labial side from protruding, it will affect the strength of the resin core. As far as we know, in the research field of fiber posts at home and abroad, only domestic scholars have designed a set of composite glass fiber posts bent into angles for the problem of tooth arrangement. However, when the fibers are bent into angles, the mechanical uniformity of the fibers will be lost. Stress concentration at the bend is easy to occur. The bionic radian bending can maintain the continuity of the fiber to a large extent, which is beneficial to enhance its flexural performance. In addition, compared with the commonly used glass fiber, quartz fiber with better transparency and aesthetic performance, elastic modulus closest to dentin, good biomechanical compatibility, and conducive to enhancing the light-curing effect during bonding is used as a fiber post as a reinforcing material. There are also few research reports. the

Under the action of biological force in the oral function state, the root canal post, as a new part of the tooth, becomes the core of the force. Therefore, whether the shape of the post is bionic or not is the key to whether the restored tooth can withstand the oral biological force. The shape and structure design of the fiber post should consider the position of the outer part of the fiber post root, so that the post is located in the center of the resin core, and is combined with the remaining dentin and core resin through resin bonding technology, and the thickness of the surrounding core resin material is balanced. As for the weak area when there is force. At present, there are no reports at home and abroad about the quartz fiber post system that simulates the shape of the anterior root canal and pulp cavity, and the outer section of the root canal is curved in a radian, and related clinical application technologies.

Contents of the invention

The purpose of the present invention is to provide a curved finished fiber post that is more in line with the anatomical shape of the tooth and has a certain bionic radian to correct the misalignment of the tooth. It not only has the general characteristics of the fiber reinforced resin post, but also conforms to the shape of the tooth. According to biomechanical requirements, it is closer to the anatomical shape of the root canal. At the same time, the unique design of the outer section of the root solves the problem of excessive labial protrusion of the outer section of the root when using conventional straight piles, which affects the uniform distribution of stress; shortening the length of the outer section of the root Nuclear strength; Fiber stakes bent at direct angles lead to problems such as reduced strength. At the same time, the design of fiber posts with different curvatures can also meet a large number of clinical dental cosmetic restoration needs.

The technical scheme that the present invention solves technical problem to take is:

A dental bionic arc-bending fiber post is compounded with epoxy resin as a matrix material and pure quartz fiber as a reinforcing material, and can be divided into a continuous inner root section and an outer root section.

The inner section of the root is cylindrical; the outer section of the root is divided into an outer section of the upper root and an outer section of the lower root. paragraph continuation;

The cross-section of the outer section of the upper root is waist-shaped, and its frontal view bus is composed of two tangent arcs, the corresponding radius R2 of the upper arc segment is 30mm, and the corresponding radius R1 of the lower arc segment is 15mm ; The upper arc section is tangent to the root inner section busbar, and the lower arc section is tangent to the lower root outer section busbar;

The radius R3 corresponding to the convex arc surface in the side view of the root outer segment is 15-46mm, preferably 15.5mm, 24mm and 46mm;

The cross-section of the outer section of the lower root is waist-shaped.

The fiber post of the present invention is integrally formed.

On the basis of fully studying the biomechanical principles of tooth structure, the present invention finds out some scientific bionic structural parameters that must be followed by artificial tooth restoration posts and nails, so that the posts and nails have the best structural form that meets the biomechanical requirements , so that the post has better function and greater applicability in oral restoration.

The invention uses pure quartz fiber and epoxy resin in a composition ratio of about 6:4, and through the processes of fiber passing through the glue tank, preforming molding, hoop fiber reinforcement, forming molding, heating, pulling, cutting, etc., the elastic modulus is made Quartz fiber piles with a pressure of 15-18 GPa.

In summary, the present invention has the advantages of traditional fiber posts: the elastic modulus is similar to that of dentin, which can effectively disperse stress and prevent root fracture caused by stress concentration; good aesthetics; corrosion resistance; fatigue resistance; easy to take out after breaking; can be used with adhesive The cement and core materials form an "integral bond" to enhance retention and flexural strength; prevent micro-leakage; do not affect imaging examinations, etc. And while inheriting these advantages, it also has unique advantages: it is more in line with the anatomical shape of the dental pulp cavity; it meets the biomechanical requirements and has a root canal post shape designed according to biological parameters; it solves the problem that the finished fiber post cannot be bent. The problem of limited application in the restoration of anterior teeth; solves the problem of strength reduction caused by direct bending of angled fiber posts and nails, etc. In addition, bionic radian bending fiber posts and nails equivalent to different angles will meet a large number of dental cosmetic restoration needs. After searching, there is no corresponding product on the market at home and abroad. This bionic curved dental fiber post will improve the application of the fiber post system and fill the gap in the corresponding field.

Description of drawings

Fig. 1 is a side view of the present invention;

Fig. 2 is the front view of the present invention;

Fig. 3 is a cross-sectional view at C-C of the lower root outer section of the present invention.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

The resin used in the present invention is: epoxy E-51+curing agent PA+accelerator (trace amount)+solvent acetone. The fiber is made of quartz fiber, which is melted by high-purity _SiO2 at high temperature, sprayed on a microporous refractory plate, passed through a water tank, and then coiled to obtain the original wire. According to the needs of the present invention, the microstrips of 5-15 μm are made, 10-20 microstrips are made into one strand, and 6-10 strands are twisted into a pile.

Design of the present invention, manufacturing process are:

1. Design of the shape of the quartz curved fiber pile

As shown in Figure 1 and Figure 2, the new type of bionic curved fiber post for dentistry is divided into an inner root section and an outer root section; The root outer segment is divided into an upper root outer segment and a lower root outer segment, the top of the upper root outer segment is connected with the root inner segment, and the bottom of the upper root outer segment is connected with the lower root outer segment. The diameter d of the upper end surface of the inner section of the root is 0.8 mm to 1.2 mm, preferably 0.8 mm, 1.0 mm and 1.2 mm, and the diameter D of the lower end surface of the inner section of the root is 1.4 mm to 1.8 mm, preferably 1.4 mm, 1.6 mm and 1.8 mm. mm for production; the root length H is 12mm.

The inner section of the root is circular in cross section. The cross-section of the outer section of the upper root is waist-shaped, which is the same as the section of the outer section of the lower root, as shown in Figure 3. The waist-shaped width W of the cross-section is 2.3-2.8mm, preferably 2.3mm, 2.5mm and 2.8mm, and the waist-shaped thickness T It is 1.0-1.2mm, and the corresponding W is preferably 1.0mm, 1.1mm and 1.2mm. As shown in Figure 2, the upper root outer section busbar is composed of two tangent arcs, the radius R2 corresponding to the upper arc segment is 30 mm, the radius R1 corresponding to the lower arc segment is 15 mm, and the upper arc segment and The busbar of the inner section of the root is tangent, and the lower arc section is tangent to the busbar of the outer section of the lower root. As shown in FIG. 1 , the radius R3 corresponding to the convex arc surface of the root outer segment is 15-46 mm, preferably 15.5 mm, 24 mm and 46 mm. Let the central axis where the inner section of the root is located be A, the line connecting the center of the interface between the top of the outer section of the upper root and the inner section of the root to the central point of the waist shape of the bottom end of the outer section of the root be B, and the line between the central axis A and the inner section of the root. The angle α formed by B is 5° to 15°, preferably 5°, 10° and 15°, and the length of the connecting line B is h, where h=8 mm.

2. Mold making

According to the CAD design drawing, on the basis of the original straight pile forming mold, the pile forming mold with different radians is manufactured by using the CNC lathe wire cutting technology.

3. Manufacture and surface treatment of curved quartz fiber piles

Using pure quartz fiber as the reinforcing material, epoxy resin as the matrix material, according to the composition ratio of about 6:4, through the process of fiber glue tank, preform molding, hoop fiber reinforcement, molding molding, heating, traction, cutting and other processes, Made of quartz fiber post with elastic modulus similar to that of dentin. And use hot sand roughening and chemical etching technology to increase its surface area and micromechanical interlocking effect with resin bonding materials, and improve its bonding and retention strength.

Claims (2)

1. A dental bionic arc bending fiber post, the bionic arc bending fiber post is composited with epoxy resin as matrix material and pure quartz fiber as reinforcing material, and is characterized in that: Divided into continuous root inner segment and root outer segment; The inner section of the root is cylindrical; the outer section of the root is divided into an outer section of the upper root and an outer section of the lower root. paragraph continuation; The cross-section of the outer section of the upper root is waist-shaped, and its frontal view bus is composed of two tangent arcs, the corresponding radius R2 of the upper arc segment is 30mm, and the corresponding radius R1 of the lower arc segment is 15mm ; The upper arc section is tangent to the root inner section busbar, and the lower arc section is tangent to the lower root outer section busbar; The radius R3 corresponding to the convex arc surface in the side view of the outer section of the root is 15-46mm; The cross-section of the outer section of the lower root is waist-shaped. 2. A dental bionic curved fiber post according to claim 1, characterized in that: the diameter of the upper end surface of the inner section of the root is 0.8 mm to 1.2 mm, and the diameter of the lower end surface of the inner section of the root is 1.4 mm to 1.8 mm; The root length is 12mm; Let the central axis where the inner section of the root is located be A, the line connecting the center of the interface between the top of the outer section of the upper root and the inner section of the root to the central point of the waist shape of the bottom end of the outer section of the root be B, and the line between the central axis A and the inner section of the root. The included angle formed by B is 5°-15°, and the length of the connecting line B is 8mm.

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