title: Effect of sealant application and thermal cycling on bond strength of tissue conditioners to acrylic resin.
abstract: The aim of this study was to evaluate the effect of sealer application and thermal cycling on the bond strength between tissue conditioners and acrylic resin, and to observe the type of bond failure. Two hundred eighty-eight specimens (10x16x3 mm) were made of an acrylic resin (Lucitone 500, Dentsply) using a metal muffle. Specimens were divided into four groups according to the tissue conditioner (Coe-Comfort, GC or Dentusoft, Densell) used and whether or not a sealer (Eversoft Soft Liner Sealer, Myerson) was applied. Each of the four groups was subdivided into other six subgroups (n=12) to undergo thermocycling for 45, 90, 135, 180 or 210 cycles with a dwell time of 60 s, or to be left non thermocycled (control). Tensile bond strength was measured in a universal testing machine at a crosshead speed of 5 mm/min. Sealant application had no effect on the tensile bond strength of the relined acrylic resin, regardless of the tissue conditioner used (Coe-Comfort: p=0.306 and Dentusoft: p=0.1501). The number of thermal cycles had a significant effect on the tensile bond strength of the relined acrylic resin (Coe-Comfort: p=0.002 and Dentusoft: p<0.001). Both tissue conditioners presented similar bond strength to acrylic resin. For both tissue conditioners, sealer coatings had no influence on bond strength, while different numbers of thermal cycles affected that mechanical property.
authors: Department of Dental Rehabilitation, Dental School, São Leopoldo Mandic Dental Research Institute, Campinas, SP, Brazil.
authors: Francisca Neta Cruz Soares
authors: FN
authors: Sampaio
authors: José Renato Ribeiro
authors: JR
authors: Pinto
authors: Cecília Pedroso
authors: CP
authors: Turssi
authors: Roberta Tarkany
authors: RT
authors: Basting
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D001840:Dental Bonding; D003764:Dental Materials / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D003819:Denture Bases; D003822:Denture Liners; D006801:Humans; D008422:Materials Testing; D010795:Phthalic Acids / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors; D014016:Tissue Conditioning, Dental / Q000295:instrumentation*
chemical_list: D000180:Acrylic Resins; D003764:Dental Materials; D010795:Phthalic Acids; C043685:Coe Comfort; C040291:Lucitone