Thermal conductivity studies of composite dental restorative materials

Abstract

SummaryThermal conductivities were determined for five commercial composite restorative materials, one composite crown arid bridge cement, two cavity "bases," arid poly(methy1 methacrylate). In addition, the effect on thermal conductivity of concentration arid type for five resin-reinforcing fillers was investigated. Ilepending upoii type and concentration of filler, the composites ranged in thermal conductivity from somewhat less than that for dentin to slightly over twice that value. Because of their good marginal adaptation, the thermal conductivity of composites must either be closely matched to tooth structiire or a base should be used in deep restorations.

Effect of Aluminum Oxide Addition on the Flexural Strength and Thermal Diffusivity of Heat‐Polymerized Acrylic Resin

“…Acrylic resin and rubber‐reinforced acrylic polymers represent approximately 95% of the denture base materials used in prosthodontics 1 . Acrylic resins have been successful as denture bases because of their ease of processing, low cost, light weight, and color matching ability; 2 however, acrylic resin denture base materials are low in strength, brittle, and low in thermal conductivity 3,4 . A variety of physical properties can be used to assess the strength of denture materials.…”

“…In edentulous patients wearing full dentures, the palate is partially covered by the denture base; consequently, the ability to sense transient temperature changes at the palate may be affected by the thermal characteristics of the denture base material. The acrylic polymer most commonly used for denture bases, polymethyl methacrylate (PMMA), has a thermal conductivity of approximately 0.2 W/min/°K, 3,11 which is approximately three orders of magnitude less than most metals. It is therefore not surprising that thermal conductivity has been one of the properties of acrylic resins most often associated with their replacement with metal as a denture base material (for example, gold and chromium cobalt alloys); 1,11–13 however, the use of metal as a denture base material has several disadvantages including increased weight of the denture, difficulty with tissue replacement in cases where substantial loss of bone has occurred, difficulty restoring denture borders within physiologic boundaries, difficulty with the relining process, esthetics, and high cost 1…”

Nanosilver Weds Acrylic Resin: A Fit or Misfit? A Review

“…Thermal conductivity is an important property of denture base material as the effect of temperatures of the food gives good patient satisfaction. [24,25] According to Kapur and Fischer, the thermal conductivity of denture base has a significant effect on parotid gland secretions and subsequently taste sensation. The temperature of palatal soft tissue influences parotid secretion.…”

An Evaluation on the Flexural Strength of Heat Cure Polymethyl methacrylate Denture Base Resin with and without Reinforcement of Polyethylene Fiber

“…However, it is still far from ideal materials because of its low mechanical strength, brittleness and low thermal conductivity. 2 Denture bases are subjected to diff erent stresses, mainly fl exural and impact 3 during i ts processing stages and after being placed in service. Studies have shown that 68% of acrylic resin dentures break within a few years of fabrication; maxillary complete denture being fractured by a combination of fatigue and impact failure, whereas for mandibular dentures, 80% of fractures by impact.…”