Evaluation of varying amounts of thermal cycling on bond strength and permanent deformation of two resilient denture liners

The Journal of Prosthetic Dentistry
José Renato Ribeiro PintoGuilherme Elias Pessanha Henriques

Abstract

Two problems found in prostheses with resilient liners are bond failure to the acrylic resin base and increased permanent deformation due to material aging. This in vitro study evaluated the effect of varying amounts of thermal cycling on bond strength and permanent deformation of 2 resilient denture liners bonded to an acrylic resin base. Plasticized acrylic resin (PermaSoft) or silicone (Softliner) resilient lining materials were processed to a heat-polymerized acrylic resin (QC-20). One hundred rectangular specimens (10 x 10-mm 2 cross-sectional area) and 100 cylindrically-shaped specimens (12.7-mm diameter x 19.0-mm height) for each liner/resin combination were used for the tensile and deformation tests, respectively. Specimen shape and liner thickness were standardized. Specimens were divided into 9 test groups (n=10) and were thermal cycled for 200, 500, 1000, 1500, 2000, 2500, 3000, 3500, and 4000 cycles. Control specimens (n=10) were stored for 24 hours in water at 37 degrees C. Mean bond strength, expressed as stress at failure (MPa), was determined with a tensile test using a universal testing machine at a crosshead speed of 5 mm/min. Analysis of failure mode, expressed as a percent (%), was recorded as either cohesiv...Continue Reading

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Jun 20, 2002·Journal of Oral Rehabilitation·A SertgözB Taskonak

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Citations

Sep 17, 2013·Journal of Applied Oral Science : Revista FOB·Saadet Atsü, Yasemin Keskın
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