This article describes measures designed to provide short-term solutions to existing RPD problems and to establish an optimum oral environment for the provision of definitive prostheses. (+info)
Application of electrolyzed acid water to sterilization of denture base part 1. Examination of sterilization effects on resin plate.
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Bactericidal activities of electrolyzed strong and weak acid waters for acrylic denture base resin were evaluated in order to discuss the applicability of these waters for sterilization of denture base. Only 1-minute immersion in the electrolyzed strong or weak acid water could completely eliminate the attached bacteria, Staphylococcus aureus 209P, on the resin plate. When the resin was relined with tissue conditioner, 5-minute immersion or 1- to 2-minute ultrasonic cleaning reduced the number of the bacteria from 10(5)/cm2 level to 10(1)/cm2 and no surviving bacteria could be detected after 10-minute treatment. These findings suggest that both the electrolyzed strong and weak acid waters are well applicable to the disinfectant for acrylic denture base showing excellent bactericidal activities in a significantly shorter treatment as compared with the conventional denture cleaning. (+info)
Effect of cervical relining of acrylic resin copings on the accuracy of stone dies obtained using a polyether impression material.
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Influence of methylmercaptan on the bonding strength of autopolymerizing reline resins to a heat-polymerized denture base resin.
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Effects of methylmercaptan solution (MS), a volatile sulfur compound produced by gram-negative oral microorganisms, on the adhesion of reline denture resins were investigated. For this purpose, a total of 120 disk-shaped specimens prepared from a heat-polymerized denture base resin (Acron) immersed in MS of different concentrations (0.01, 0.1, and 1.0 mol) as well as in purified water as a control at 37 degrees C for 4 weeks. Each of three commercial autopolymerizing reline resins (Rebaron, Mild Rebaron, and Tokuyama Rebase II) was bonded to a specimen. The shear bond strength tests were conducted for the specimens, with and without the application of a primer. The bond strength with 1.0 mol MS was significantly lower than those with other solutions (p < 0.05). The primer application had a significant positive effect on the bond strength. The debonded Acron surfaces showed evidence of incomplete polymerization. The results suggested a potential adhesion-inhibiting effect of the MS on relined dentures. (+info)
Effect of microwave postpolymerization treatment on residual monomer content and the flexural strength of autopolymerizing reline resin.
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Direct chairside hard reline at delivery of a newly fabricated distal extension removable partial denture: considerations and techniques.
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The stability of a dental prosthesis is its resistance to displacement when it is subjected to functional, horizontal and rotational stresses. For a removable partial denture (RPD), stability depends greatly on overall quality of fit to the supporting teeth and tissues. There are numerous reasons why the fit of a newly fabricated RPD might be compromised, but it is easy for the dentist to determine visually whether vertical movement is excessive. If finger pressure applied to the distal-most tooth on a distal extension denture base results in lifting of the anterior-most indirect retainer, then the RPD is not stable and either an indirect (laboratory processed) or direct (chairside) hard reline should be carried out. In this paper, we discuss factors that might influence the need to do a direct, chairside hard reline at delivery of a newly fabricated distal extension RPD and we recommend techniques. (+info)
Histopathological examination of newly-developed adhesive silicone denture relining material.
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We aimed to evaluate the subcutaneous tissue reaction to a newly developed adhesive silicone denture relining material, SG, (Neo Dental Chemical Products Co., Ltd. Tokyo, Japan). We embedded the experimental material SG and another existing control material, Roeko Seal (RS), in the dorsal area of 22 male ddY mice. One week and 12 weeks after the embedding, the tissues surrounding the embedded materials were removed and a histopathological examination was performed. The results demonstrate that the basic histopathological aspects are the formation of granulation tissue and the change of the tissue to fibrous capsule over time. The results suggests that the newly-developed SG is safe as compared with the control RS, whose composition is similar. (+info)