Shear bond strength of microwaveable acrylic resin for denture repair

Abstract

Microwaveable acrylic denture resins are believed to provide an effective means of repairing fractured dentures. This in vitro investigation compared the bond strength of a microwaveable acrylic resin as a denture repair material to two established auto-polymerized resins. Fifty-one specimens were made using Lucitone 199 as a simulated denture base, and were then divided into three groups of 17 samples each. Each test group was bonded with the following acrylic resins: Acron Mc, Rapid Repair and Palapress. A shear bond strength test was carried out 24 h after the samples were bonded. Fracture analysis showed that bond failure was adhesive for all groups. Shear bond values showed a statistically significant difference at P < 0.05 level between Acron Mc and Rapid Repair; Palapress and Rapid Repair, and indicated that Acron Mc and Palapress were superior to Rapid Repair as a repair material. However, there was no statistical difference found between Acron Mc and Palapress. Microwaveable acrylic resins produce repaired junctions of adequate strength.

Factors Affecting the Strength of Denture Repairs

“…5,37,38 The advantages of microwave-polymerized acrylic resins are the lower residual monomer content and superior physical properties. 9 Rached and Del Bel Cury 25 found that the transverse strength of microwavepolymerized acrylic resin was 93% to 106% of the original acrylic resin. Studies have shown that when the fractured heat-polymerized specimens are repaired with microwave-polymerized acrylic resin, the transverse strength and impact resistance of the repaired specimens are superior to those of specimens repaired with autopolymerizing acrylic resin.…”

“…The choice of denture base resin and repair material combination may also influence the final strength of denture repair. 3,9,[17][18][19][20][21][22][23][24][25] This article reviews some of the current literature with regard to the most important factors that may influence the strength of acrylic denture repairs.…”

Bond Strength Assessment Between Acrylic Teeth and Acrylic Resin Repairs: Effect of Different Surface Treatments

“…Alternativas semejantes también fueron sugeridas por otros autores que evaluaron la influencia del condicionamiento físico-químico de la superficie en reparaciones de dientes perdidos (11,18,20,23,26).…”

“…La metodología empleada en el presente trabajo fue adaptada de estudios previamente consultados (11,18,20,23). Inicialmente los dientes fueron embutidos individualmente en resina acrílica químicamente activada (Jet, Artigos odontológicos Clássico, SP/Brasil), con la ayuda de tubos de PVC (20mm de diámetro por 20 milímetros de altura).…”

“…Sin embargo, al momento de realizar la elección del material de reparación es importante considerar ciertos aspectos: simple de usar, corto tiempo de polimerización, alta resistencia y durabilidad, además de presentar estética apropiada, ser antialérgico y no causar distorsión de la prótesis existente (11,12).…”