Dental Material and Methods of Use

a technology of dental materials and compositions, applied in the field of dental material compositions, can solve the problems of reducing the adhesion to the walls of the canal, weakened root canals, and prone to fractur

Inactive Publication Date: 2008-12-04
PENTRON CLINICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process, while essential, results in a root canal that is weakened and susceptible to fracture.
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.
When cold (at ambient temperature or at the temperature of the oral cavity), the gutta-percha is not malleable so it cannot be molded to the canal walls, resulting in poor adaptation.
This can reduce adherence to the walls of the canal and it often results in a less than ideal seal.
A publication entitled “Analysis Of Shrinkage Of Different Gutta-Percha Types Using Optical Measurement Methods” in Schweiz Monatsschr Zahnmed, 2006; 116(4):356-61, has shown that commercial dental gutta percha materials have the volume shrinkage of about 6.5-7.3% when heated to about 90° C. and cooled down to about 35° C. Due to poor adaptation to the canal wall or dimensional change caused by volume shrinkage, leakage may result, which facilitates the bacteria to enter the canal from the mouth, which can lead to the persistence of an infection or other complications.

Method used

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  • Dental Material and Methods of Use
  • Dental Material and Methods of Use
  • Dental Material and Methods of Use

Examples

Experimental program
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Effect test

example 1

[0044]Commercial polyisobutylene with an average molar mass of about 40,000 g / mol. and 85,000 g / mol. (Oppanol B 10 and Oppanol B 12 respectively, from BASF Chemical Company, Germany) were utilized. Table 1 below illustrates inventive dental filling material compositions.

TABLE 1Composition 1Composition 2Components(% by weight)(% by weight)Oppanol B 10 SFN40Oppanol B 12 SFN40Bismuthoxy Chloride6060

[0045]To blend the filler into the polybutylene polymer, the polymer was heated at the temperature of about 80° C. to melt it, then the filler was added and mixed until a homogenous putty compound was obtained. The compound was then cooled down to ambient temperature to form the inventive filling material. Alternatively, the polymer can be dissolved by a solvent and filler can be blended thereafter. Then, the solvent is pulled out under a negative pressure to form the dental filling compound.

example 2

[0046]This illustrates the “cold flow” feature of the inventive dental filling materials. A testing method according to an abstract presented at the International Association for Dental Research Convention in Orlando, 2006, Abstract #1442 entitled “Influence of Rheology of Obturating Materials on Lateral Canal Flow” by Karmaker et al, which is hereby incorporated by reference, was used herein. Compositions 1 and 2 from Table 1 were hand molded onto a size 30 obturator carrier after the original gutta percha over-molding coating layer was peeled off to form an inventive “cold flow” filling cone. The new filling cone with the size 30 carrier was then inserted into a clear plastic endodontic trial block (available from Sybron Dental, CA) having a simulated root canal with a lateral thin canal in a perpendicular direction to the main canal at about mid point. The length of the lateral canal penetration by the outer layer coating material was then measured and compared. The deeper the pe...

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Abstract

A dental filling material comprising a polybutylene polymer having a molecular weight of about 10,000 to about 100,000 and being viscoelastic at about 20° C. 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

FIELD OF THE INVENTION[0001]This invention relates to dental material compositions suitable for dental filling and / or sealing applications, especially for use in root canal treatments.BACKGROUND OF THE INVENTION[0002]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 with bony tissue. In such teeth, the pulp tissue and excised portions of the root should be replaced by a biocompatible substitute.[0003]One technique for the preparation of a root canal involves ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61C5/02A61K6/083C08F10/08C08F10/10A61K6/884
CPCA61C5/02A61K6/0038A61K6/0073C08L23/22A61C5/40A61K6/54A61K6/71
Inventor JIA, WEITAO
Owner PENTRON CLINICAL TECH
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