Recycling of used alginate impression materials into final polishing powder for methacrylate denture base resins

Dental polymers, commonly known as “Dental Resins” were first used in dentistry in 1839, and since then they have emerged as a favorable candidate for restorative dentistry and cosmetic and functional purposes. Many prosthesis and implants made from polymers have been in use for the last three decades and there is a continuous search for more biocompatible and stronger polymer prosthetic materials. Typical applications of polymers in dentistry are impression materials, relining materials, temporary crown materials, denture base materials, obturation materials (endodontic treatment), and filling materials (composite, cements, adhesives). The dental polymers that are to be used in the oral cavity should be harmless to all oral tissues – gingiva, mucosa, pulp, and bone. Furthermore, it should contain no toxic, leachable, or diffusible substance that can be absorbed into the circulatory system, causing systemic toxic responses, including teratogenic or carcinogenic effects. The materials should also be free of agents that could elicit sensitization or an allergic response in a sensitized patient. Rarely, unintended side effects of dental polymers may occur as a result of toxic, irritative, or allergic reactions. The most widely used polymer in prosthodontics is polymethyl-methacrylate resin (PMMA), which is used for fabrication of various dental prostheses and denture liners, temporary crowns and orthodontic appliances. The aim of the current paper is to provide an overview of the current literature on toxicology of dental polymers and to give implications for possible improvements concerning their biocompatibility.

Download Full-text

Selected Applications for Current Polymers in Prosthetic Dentistry - State of the Art

Current Medicinal Chemistry ◽

10.2174/0929867325666180510142937 ◽

2019 ◽

Vol 25 (42) ◽

pp. 6002-6012 ◽

Cited By ~ 2

Author(s):

Maciej Kawala ◽

Joanna Smardz ◽

Lukasz Adamczyk ◽

Natalia Grychowska ◽

Mieszko Wieckiewicz

Keyword(s):

Antimicrobial Properties ◽

Polymeric Materials ◽

Material Structure ◽

Occlusal Splint ◽

Denture Base ◽

Prosthetic Dentistry ◽

Base Materials ◽

Modified Polymers ◽

Impression Materials

Background: Polymers have wide applications in medicine, including dentistry, i.e. in prosthetic dentistry. Aim: The following paper is aimed at demonstrating the applications of selected modern polymers in prosthetic dentistry based on the reported literature. Material and Methods: The study was conducted using the PubMed, SCOPUS and CINAHL databases in relation to documents published during 1999–2017. The following keywords were used: polymers with prosthetic dentistry, impression materials, denture base materials, bite registration materials, denture soft liners, occlusal splint materials and 3D printing. Original papers and reviews which were significant from the modern clinical viewpoint and practical validity in relation to the possibility of using polymeric materials in prosthetic dentistry were presented. Results: Denture base materials were the most commonly modified polymers. Modifications mainly concerned antimicrobial properties and reinforcement of the material structure by introducing additional fibers. Antimicrobial modifications were also common in case of relining materials. Conclusion: Polymeric materials have widely been used in prosthetic dentistry. Modifications of their composition allow achieving new, beneficial properties that affect the quality of patients’ life. Progress in science allows for a more methodologically-advanced research on the synthesis of new polymeric materials and incorporation of new substances into already known polymeric materials, that will require systematization and appropriate classification.

Download Full-text

Effect of Different Impression Techniques on the Dimensional Accuracy of Impressions using Various Elastomeric Impression Materials: An in vitro Study

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-1102 ◽

2012 ◽

Vol 13 (1) ◽

pp. 98-106 ◽

Cited By ~ 9

Author(s):

Kishan Singh ◽

Sukant Sahoo ◽

KD Prasad ◽

Meenu Goel ◽

Anupam Singh

Keyword(s):

In Vitro Study ◽

Dimensional Accuracy ◽

Acrylic Resin ◽

Denture Base ◽

Heavy Body ◽

Impression Materials ◽

Natural Teeth ◽

Crown Preparation ◽

Maxillary Arch

ABSTRACT Production of exemplary crowns and fixed partial dentures depends upon the usage of impression material and its technique of usage that accurately reproduces prepared teeth and their relationship to the adjacent oral structure. Aim To evaluate the linear dimensional accuracy of the elastomeric impressions using various impression techniques using different combinations of viscosities of impression materials. Materials and methods Crown preparation was done in a dentulous acrylic resin denture base model with six natural teeth embedded into it was made to represent the dentulous maxillary arch. A total of 55 impressions were obtained and poured in die stone using various impression techniques with different combinations of viscosities of impression materials. Results Among the six techniques used, the heavy body light body two-step technique using custom tray showed the least distortion which was closely followed by the putty wash two-step technique with 2 mm spacer using stock tray. Conclusion The study revealed that the heavy body light body two-step technique with custom tray provided the best results. Clinical significance Dimensional accuracy of impressions is very much required for precisely fitting of prosthesis. This study may be helpfull to select the technique and materials as per clinical requirement of accuracy of impressions. How to cite this article Singh K, Sahoo S, Prasad KD, Goel M, Singh A. Effect of Different Impression Techniques on the Dimensional Accuracy of Impressions using Various Elastomeric Impression Materials: An in vitro Study. J Contemp Dent Pract 2012;13(1):98-106.

Download Full-text