Effect of the vibration of ultrasonic scaling on composite restorative materials [invivo and invitro study]

The aim of this study was to evaluate the effect of ultrasonic vibration sealing on two composite restorative materials [microfilled and hybrid]. Twenty healthy male individuals were selected for in vivo study of both the plaque index [PII] for anterior teeth that were restored with composite resin restoration and streptococcus count for microbiological study before and after ultrasonic vibration. Forty extracted sound molar teeth for testing the shear bond strength and forty composite resin specimen for testing the abrasion loss of weight were used for the invitro study. Two and One way ANOVA statistical tests were used in this study. The result of this study concluded that, using of ultrasonic scaler in periodontal therapy reduced the plaque index [PII] and streptococcus count. There was a highly significant differences between teeth surfaces and composite resin restoration [microfilled and hybrid] after ultrasonic cleaning. The shear bond strength between tooth surface and composite resin was reduced after using ultrasonic vibration in parallel direction. Also, using ultrasonic cleaning in [parallel or perpendicular] direction causes significant abrasion loss of weight for composite resin [microfilled and hybrid] Clinical Implication: Using ultrasonic scaling in periodontal therapy produce good periodontal but in teeth restored with composite resin it harmful effect on the bond strength and abrasion resistance so a shield should be placed on area of restoration and the time of parallel vibration of ultrasonic device