Effect of microwave treatment on the shear bond strength of different types of commercial teeth to acrylic resin

Carmignani, Mariana R.; Mesquita, Marcelo Ferraz; Correr-Sobrinho, Lourenço; Guiraldo, Ricardo Danil

doi:10.1111/j.1741-2358.2009.00333.x

Cited by 2 publications

(1 citation statement)

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“…Accuracy of fit of dentures is one of the most important requirements for the success in rehabilitation of a fully edentate patient 1 . However, dimensional changes and distortions are inherent to laboratory procedures 2 . In the acrylic resin flasking procedure, the combination of polymerisation shrinkage, different thermal contraction during flask cooling methods and strain accompanying stress release during deflasking can cause linear alterations 3 .…”

Section: Introductionmentioning

confidence: 99%

Effect of double flasking and investing methods on artificial teeth movement in complete dentures processing

et al. 2011

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Effect of double flasking and investing methods on artificial teeth movement in complete dentures processingPurpose: The aim of this study was to evaluate linear dimensional alterations of artificial teeth for complete dentures when using different investment and flasking techniques. Background: Dimensional changes in the vertical dimension may occur owing to changes in artificial teeth positioning caused by different investing and flasking techniques. Materials and methods: Thirty pairs of the complete dentures were manufactured and randomly divided into three groups (n = 10): (1) invested with type III stone in monomaxillary PVC flask; (2) invested with type III stone in bimaxillary PVC flask; and (3) invested with laboratory silicone in bimaxillary PVC flask. Dentures were polymerised by microwave, and 12 linear distances were measured before and after denture processing. Data were analysed by one-way ANOVA, considering manufacturing technique as the study factor. Tukey's HSD was used as post hoc ANOVA (p = 0.05). Results: Most of the linear distances were comparable for all groups. All transversal maxillary and mandibular distances were higher for group 1 compared with groups 2 and 3 (p < 0.05), except the distance 3-6 for mandibular arch, in which no difference was found between groups (p < 0.05). Both maxillary diagonal distances were higher in group 1 (p < 0.05), and no differences were found among all groups for mandibular measurements. Conclusions: Double flasking technique independent on the investment material is shown to be the most effective method to reduce changes in artificial teeth positioning.

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Section: Introductionmentioning

confidence: 99%

Effect of double flasking and investing methods on artificial teeth movement in complete dentures processing

et al. 2011

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The Effect of Microwave Disinfection on Denture Base Polymers, Liners and Teeth: A Basic Overview

Klironomos¹,

Katsimpali²,

Polyzois

2015

Acta Stomatol Croat

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The aim of this paper was to overview the current scientific knowledge concerning the effect of microwave disinfection on denture related material properties. Cross-infection control in dentistry is a significant issue in everyday clinical practice due to the recent increase in some infectious diseases such as hepatitis B, C and AIDS and therefore numerous methods of disinfection have been used. The most widespread method of disinfection used in everyday practice is chemical, however, studies have suggested that chemical disinfectants alter the physical and mechanical properties of the acrylic resins and enable the growth and proliferation of certain bacteria. Therefore, microwaves were introduced as an easy to use-and-access, low cost, chemical free alternative. The question that arose was if and in what way the microwave irradiation affected the denture related material properties. Microwaving affects the denture resin bases, liners and teeth in different ways. The results showed that microwave disinfection could be a safe alternative for the disinfection of denture bases and liners compared to the chemical one, when the procedure is carried out in dry conditions, but could possibly cause dimensional changes of clinical significance on them when the irradiation takes place in wet environment. It also seems to have no detrimental effects of clinical importance on the flexural properties, impact strength and hardness of denture resins and the bond, flexural strength, porosity and hardness of denture liners. The effects of microwave disinfection on the hardness of denture teeth and teeth/denture bond strength are still controversial and no safe conclusions can be drawn.

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Effect of microwave treatment on the shear bond strength of different types of commercial teeth to acrylic resin

Abstract: Shear bond strength of the tooth/resin bond was influenced by the microwave treatment and different commercial teeth association, and was lower for the Biotone tooth.

Cited by 2 publications

References 41 publications

Effect of double flasking and investing methods on artificial teeth movement in complete dentures processing

Effect of double flasking and investing methods on artificial teeth movement in complete dentures processing

The Effect of Microwave Disinfection on Denture Base Polymers, Liners and Teeth: A Basic Overview

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