Effects of thermal cycling on surface texture of restorative composite materials.
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.
Minami
Hiroyuki
H
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
Hori
Sayaka
S
Kurashige
Hisanori
H
Murahara
Sadaaki
S
Muraguchi
Koichi
K
Minesaki
Yoshito
Y
Tanaka
Takuo
T
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
D000180:Acrylic Resins; D004396:Coloring Agents; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes