title: Effects of thermal cycling on surface texture of restorative composite materials.
abstract: The purpose of this study was to evaluate the effect of thermal cycling on the surface texture of restorative materials. Disk-shaped specimens made of seven resin composites (Beautifil: BF; Esthet-X: EX; Filtek Supreme: FS; Inten-S: IS; Point 4: PT; Solare: SR; and Venus: VS) were finished with 1-microm alumina suspension, and then thermocycled between 4 and 60 degrees C in distilled water for 20,000 or 50,000 cycles with a dwell time of 60 seconds. Staining susceptibility and mean surface roughness, Ra, were examined, and surface texture was observed by scanning electron microscopy. Dye penetration test showed that the surfaces of all resin composites were more stained after thermal cycling. Mean Ra of all resin composites, except PT, significantly increased after 50,000 thermal cycles. Dislodgement of filler particles was observed for all resin composites after thermal cycling, except FS. It was concluded that thermal cycling significantly affected the surface texture of the seven examined resin composites.
authors: Department of Fixed Prosthodontics, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima, 890-8544, Japan. minami@dentb.hal.kagoshima-u.ac.jp
authors: Hiroyuki
authors: H
authors: Minami
authors: Sayaka
authors: S
authors: Hori
authors: Hisanori
authors: H
authors: Kurashige
authors: Sadaaki
authors: S
authors: Murahara
authors: Koichi
authors: K
authors: Muraguchi
authors: Yoshito
authors: Y
authors: Minesaki
authors: Takuo
authors: T
authors: Tanaka
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D004396:Coloring Agents; D003188:Composite Resins / Q000737:chemistry*; D006358:Hot Temperature / Q000009:adverse effects*; D011140:Polyurethanes / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins; D004396:Coloring Agents; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes