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.

Recent Advances in Tissue Conditioners for Prosthetic Treatment. A review.

“…[13][14][15] It has been shown that over a period of 1 week, water sorption increased from 0.2 to 5.6 mg/cm, and solubility ranged from 0.03 to 0.40 mg/cm for various commercial products. [16][17][18] One of the main problems with silicone-based TCs concerns bonding to the denture base surface. It has been shown that "adhesion" between the lining mate-rial and base of the denture is the most common source of failure of a resilient-lined denture.…”

Bond Strength of Resilient Lining Materials to Denture Base Resin: A Systematic Review and Meta‐Analysis

“…Akin et al reported that lasers were more effective than chemicals of the liner. Sampaio et al evaluated the bond strength of acrylic‐based resilient lining material to PMMA by using a tensile test and reported similar results between chemicals of the liner and control. Minami et al evaluated the bond strength of silicon‐based resilient lining material to PMMA by using tensile test and reported that chemicals of the resilient liner increased the bond strength, but reduced the bond strength if supported by sandblasting.…”

Thermal cycling effect of dicalcium phosphate-reinforced composites on auto-mineralized dental resin

“…Light curing was performed on each respective side for 40 s using a light-cure machine (Demetron Optilux 401, Kerr, USA). The samples were divided into two groups: (1) the as-prepared dried samples from curing, which were tested immediately; and (2) the wet samples, which were obtained by further immersing the cured specimen in deionized water at 37°C beyond the initial 24 h immersion, followed by thermal cycling (600 and 2400 cycles, 5°C/55°C, 2 min/cycle; Long Wha Enterprise Co., Kaohsiung, Taiwan) [22]. The water baths were used to prevent ion effects and evaluate auto-mineralization.…”

“…To investigate the aging process of the composite resins, the effect of mineralization and the efficiency of silane-modified nanocrystals in composite resins during thermal cycling were evaluated. Although the thermal fatigue numbers of thermal cycling varied in large ranges depending on the applied condition and restorative sites, cycling time ranges from 100 to 12000 cycles [22][23][24][25]. Thermal cycling is generally used to simulate the temperature fluctuations that occur in the oral cavity to generate stress and to determine the changes in the properties of the prosthetic materials with age [22,23].…”

“…Although the thermal fatigue numbers of thermal cycling varied in large ranges depending on the applied condition and restorative sites, cycling time ranges from 100 to 12000 cycles [22][23][24][25]. Thermal cycling is generally used to simulate the temperature fluctuations that occur in the oral cavity to generate stress and to determine the changes in the properties of the prosthetic materials with age [22,23]. To simulate oral conditions in a patient with prosthetic resins that eats three times a day, teeth were thermally cycled for three times at 5°C/55°C, [24].…”