18. Shear Bond Strength of Composite Resin for Repaired Restorations

• Published in: Dental Medicine Research Vol. 32; no. 1; pp. 48 - 49
• Main Authors: Mikihiro Kobayashi, Atsufumi Manabe, Hisashi Hisamitsu, Akihiro Fujishima, Takashi Miyazaki
• Format: Journal Article
• Language: Japanese
• Published: Showa University Dental Society 31.03.2012
• ISSN: 1882-0719

Repair of composite resin is a treatment aligned with the concept of MI. This study examined the state of shear bond strength due to differences in surface condition and surface treatment of the composite resin to be repaired. The shear bond strength after thermal cycling stress (between 5 and 60℃ 20,000 times) was investigated in each condition. The methods were as follows: We used two types of composite resin (Clearfil AP-X, Beautifil Flow F02) and bonding agent (Clearfil Photo Bond) and a silane coupling agent (Cleafil Porcelain Bond Activator).The date was analyzed using Tueky's test (p<0.05).The shear bond strength test after thermal cycling stress was analyzed using a t-test (p<0.05). Produced specimens (2.5×1×1) were stored in water for one week, and then the surface was either cut or not cut with a diamond point after that, the surface was repaired with composite resin. After storage for one week in 37℃ water, the specimens were subjected to a shear bond strength test. The conclusions are as follows: When AP-X was repaired with AP-X, the bond strength tended to increase using a silane coupling treatment. When Beautifil was repaired with Beautifil, the bond strength tended to increase using surface treatment with silane coupling and cutting with a diamond point. When AP-X was repaired with Beutifil Flow F02, and when composite resin was repaired with different types of composite resin, the bond strength tended to increase when the surface was not cut. Bond strength in all the conditions was not affected by thermal cycling stress.