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Dental Filling Material and Endodontic Post

a technology of endodontic posts and filling materials, applied in the field of filling materials, can solve the problems of poor strength and brittleness of the gutta percha, the tendency of the point/cone of the dental gutta percha to break, and the inability to bond

Inactive Publication Date: 2007-06-14
JIA WEITAO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a filling material for dental cavities or root canals that is made of a thermoplastic polymer that can be biodegraded. This material can be used to seal the apical end of a root canal that has been opened and can also be compacted towards the apex to ensure proper sealing. The material can disintegrate or break down and be absorbed or partially absorbed by the surrounding living tissues if it is pushed slightly past the apex or comes in contact with fluids in the mouth. The presence of a bioactive substance in the material can help mend and grow tissue to fill in any gaps or openings in the mouth.

Problems solved by technology

It has been a challenge for dentists to control the exact amount of the material within the border of the root canal to avoid overfilling.
Moreover, gutta percha material is a polyisoprene rubber material in nature, which does not have the capability to bond to most of the dental materials, especially when the root canal sealer is a polymer-based material.
Gutta percha exhibits poor strength and brittleness.
Dental gutta percha points / cones tend to break in harsh conditions, e.g., sharply curved root canals, tight spaces during a root canal treatment, and the like.

Method used

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  • Dental Filling Material and Endodontic Post
  • Dental Filling Material and Endodontic Post
  • Dental Filling Material and Endodontic Post

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] A composition comprising polycaprolactone available from Union Carbide in an amount of about 40%, a bioactive glass having a composition similar to Bioglass™ (available from by U.S. Biomaterials) in an amount of about 30%, USP grade zinc oxide in an amount of about 20% and barium sulfate as a radio-opacifying agent in an amount of about 10% was manufactured. The method of forming the composition involved heating the polycaprolactone at about 70° C. to a softened state. The remaining ingredients were then added and mixed under the action of kneading, pressing, or mixing to blend into the polycaprolactone completely to form a homogenous dough. The formed compound was then ready for application to the carrier device.

example 2

[0026] A composition comprising polycaprolactone in an amount of about 30%, caprolactone (methacryloxy)ethyl ester (CMEE) in an amount of about 10%, tricalcium phosphate in an amount of about 30%, and zirconium oxide in an amount of about 10% was manufactured. The method of forming the composition involved heating the polycaprolactone (available from Union Carbide) at about 70° C. to a softened state. The remaining ingredients were then added and mixed under the action of kneading, pressing, or mixing to blend into the polycaprolactone completely to form a homogenous dough. The formed compound was then ready for application to the carrier device.

[0027] The following Table 1 sets forth examples of the filling material compositions made similar to the methods described in Examples 1 and 2 above.

TABLE 1Composition WEIGHT (%)ABCDEP767*40302125P787*927PEGDMA(400)58UDMA10CMEE**10Bioactive glass301021.530ZnO201021.52525BaSO4202220BiOCl10Ca(OH)220Ca3(PO4)220ZrO210

*P767 and P787 are polyc...

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Abstract

An endodontic post comprising a dental filling material, wherein the filling material comprises a thermoplastic polymer. The thermoplastic polymer may be biodegradable. A bioactive substance may also be included in the filling material. The thermoplastic polymer acts as a matrix for the bioactive substance. The composition may include other polymeric resins, fillers, plasticizers and other additives typically used in dental materials. The filling material is used for the filing of root canals.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation-in-part of application Ser. No. 10 / 279,609 filed Oct. 24, 2002, which claims priority to provisional application Ser. No. 60 / 336,500 filed Oct. 24, 2001.FIELD OF THE INVENTION [0002] This invention relates to filling materials for use in filling dental cavities and for root canal treatments. BACKGROUND OF THE INVENTION [0003] Endodontics or root canal therapy is that branch of dentistry that deals with the diseases of the dental pulp and associated tissues. One aspect of endodontics comprises the treatment of infected root canals, the removal of diseased pulp tissues, followed by the biomechanical modification and the subsequent filling of the pulp cavity (root canal). Root canal therapy is generally indicated for teeth having sound external structures but having diseased, dead or dying pulp tissues. Such teeth may or may not generally possess intact enamel and dentin and are satisfactorily engaged wit...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09K3/00A61C5/02A61C5/06A61K6/083A61K6/884
CPCA61C5/02A61C5/062A61K6/0023A61K6/0038A61K6/0085A61K6/0091A61K6/0606A61K6/083A61K6/087C08L67/04C08L33/00C08L59/00A61C5/40A61C5/62A61K6/30A61K6/54A61K6/75A61K6/77A61K6/851A61K6/887A61K6/891
Inventor JIA, WEITAOALPERT, BRUCE
Owner JIA WEITAO
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