Modified Processing Technique for Acrylic Resin Denture Base (original) (raw)
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Proposed technique for fabricating complete denture
Introduction: Reduction of the visits for fabricating complete dentures are welcomed by both dentists and patients and this might be an aspect of the new changes in prosthodontic treatment according to the suggested new methods. Clinical Innovation: Complete dentures fabricated by the technique described in this report reduce processing time, cost and efforts since the technique does not require the use of gypsum materials, metal flasks or other related materials to obtain a mold for packing the heat cured acrylic resin as might be needed with the conventional method. This method requires only an appropriate volume of silicone impression material to provide the required mold and a heat pressure machine for processing and polymerization of the heat-cured acrylic resin. Although this technique might be difficult to be applicable by all dentist but it could be consider an advisable method. Discussion: Because the record base in this technique is made of heat cured resin, it provides a reliable denture base with better retention and stability and it overcomes the shortcomings that may be faced during registration of vertical dimension. This technique meets the basic requirements for a successful complete denture which is well tolerated by the patient’s mouth. Key words: Acrylic, denture, polymerization, technique
Background: The advent of acrylic resins in 1937 was a major breakthrough in the annals of modern dentistry. Their recognition and acceptance in prosthodontics was indeed incredible as they were found to be more aesthetic, easy to manipulate both in the clinic as well as in the laboratory. Aims: To determine the effect of high expansion stone (type V) in compensating the acrylic resin shrinkage compared to type III dental stone. Materials and Methods: A total of 30 edentulous maxillary casts were made from this master mold, out of which 15 were made with type-V high expansion dental stone and another 15 were made from type-III dental stone. These 30 edentulous casts were used for processing the maxillary denture bases. Each acrylized denture base was recovered, trimmed, polished and numbered before its adaptation on the master cast for reading. Results: Analysis of the data revealed that the maxillary denture bases processed on high expansion dental stone casts produced openings along the posterior palatal border that were substantially 39% smaller compared with the denture bases processed on type-III dental stone. Conclusion: The use of high expansion dental stone can be recommended to compensate for the acrylic shrinkage.
Al-Azhar Dental Journal for Girls, 2019
To evaluate the effect of flexible lingual flanges on the retention of conventional mandibular complete denture. Material and methods: Ten completely edentulous patients were selected for this study with ages ranged from 50-60 years. All patients had received heat cured acrylic resin denture without modification (Group І) then heat cure lingual flanges were removed and replaced by flexible lingual flanges (Group ІІ). All patients were instructed to use their resin dentures for equal periods of three months when retention of denture base were measured after one month and at the end of three months, period of two week interval was left between each group as a washing period. results: The results of this study showed that there was a significant difference between them, as the flexible lingual flanges (group ІІ) was better than the heat cured acrylic resin denture base (group І). Conclusion: Within the limitation of this study, it was concluded that retention of the mandibular denture modified with flexible acrylic resin "versacryl" was higher than that of the conventional heat cured acrylic resin denture. Retention was increased by time in each study group. The use of flexible acrylic resin in mandibular complete dentures (as lingual flange) could be considered as an alternative effective treatment. IntroduCtIon Polymethylmethacrylate (PMMA) resin has been successfully used for various applications in dentistry for many years. It has many advantages, particularly its appearance and ease of manipulation, but it still has certain poor mechanical properties. Fractures may occur during use due to unsatisfactory impact and transverse strength. Dimensional stability is of considerable importance as a clinical problem as well. Therefore, in the clinical practice of dentistry, there are many circumstances in which the need to adjust denture base acrylic resin is necessary (1) .
New clinical technique for fabrication immediate partial denture
Immediate partial denture is a choice of treatment due to various cases of teeth extraction such as badly carious teeth, periodontal disease, eruption problems, trauma, and other reasons. Many choices are used to replace the lost teeth; one of these choices is a removable plastic denture in which hot cured acrylic resin should be used to fabricate such denture. Aim of Study: To provide an applicable technique to fabricate an immediate partial denture by reducing and declining the prosthetic steps and some materials in proportional to the conventional method. Clinical Procedures: Maxillary and mandibular stone casts are mounted to a simple articulator and the procedures are explained as step by step to fabricate an immediate partial denture without using the conventional methods and material, just using a small quantity of white cold cure acrylic resin to fabricate the artificial teeth, hot cure acrylic resin for the denture base and mold made of a silicon impression material are used to fabricate an immediate partial denture. Conclusion: The finished immediate partial denture showed a good retention and produced the exact shapes and sizes of the extracted teeth with low cost and less time for a dentist and patient. Key words: Acrylic, immediate temporary denture, immediate denture, prosthodontic, technique
Denture Base Resins From Past to New Era
2020
In the past, the ingredients used for the denture bases were formaldehyde of vulcanite, celluloid & phenol. Around 1930's, acrylic resins were brought into dental work. There are other disadvantages of acrylics, such as residual monomer sensitivity, weak mechanical resistance, low fatigue power, fragile on contact, weak heat conductors, low stiffness, strong thermal expansion coefficient, thermal shrinkage, bad color consistency of self-curing resins, porosity, craziness, warpage, poor metal and porcelain adhesion and mechanical retaining criteria. But they are also the most commonly used products of the denture foundation to date. The aim of this literature review was to examine the established works on denture-based resources for the manufacture of full dentures and provide historical context, current status, and potential perspectives on evolving technologies to the reader. The analysis of many dentures provides an overview of the various developments in this field. The polym...
Alternative Technologies for Dentures Manufacturing using Different Types of Resins
2010
In the idea of improving the performances of both full and removable partial dentures, new materials and technologies are coming on the market, promising a better quality. Thermoplastic materials are used more and more widely in the technology of complete or removable partial dentures due to their superior qualities. Thermoplastic resins are suitable for manufacturing a wide range of removable partial dentures without metallic structure, in optimal conditions of biocompatibility. By injection, we have manufactured several removable partial dentures without metallic structure. Full denture casting currently represents a technological alternative. The casting system we tested, usually uses reversible hydrocolloids for investing wax patterns. Besides the system’s own advantages, the authors also noticed certain errors consecutive to casting, materialized in lack of substance and the development of porosities on the mucosal facets of the complete denture bases.
Reinforcement of Denture Base Resin
Advances in Science and Technology, 2006
The fracture resistance of polymethyl methacrylate (PMMA) the most popular denture base materials, is not satisfactory. The aim of this study is to improve the mechanical properties of PMMA by adding filler particles. Different inorganic filler particles including micronised glass flakes, acryl silane micronised, glass flakes 350nm, TiO 2 and ZrO 2 with different ratios by weight were incorporated into heat-cure plain PMMA and processed with optimal condition [2.5:1 Powder/ monomer ratio, conventional packing method and water bath curing for 2 hours at 95ºC] to produce 12mm diameter and 2mm thick discs. Plain PMMA without additives was prepared as a test control. Three types of mechanical tests, biaxial flexure, microindentation fracture toughness and Vickers hardness were carried out on the samples. It was found that incorporating the particles did not improve the biaxial flexural strength of the resin. However, TiO 2 , ZrO 2 and micronised glass flakes increased the fracture toughness of the resin. The hardness of PMMA was improved by the incorporation of all the particles.