Abstract:Marginal adaptation is a critical property of treatment . These summaries marginal fit in the light potential disrupting factors And underlying mechanisms in provisional fixed prosthesis treatment. Marginal gap at tooth restoration and should be sealed properly . Microbial leakage is the most important factor influencing long term success of restoration and causing interfacial contamination of bacteria through ingress of oral fluids.Complications of marginal integrity can cause micro/nano size gaps resulting in plaque accumulation, sensitivity, and secondary caries.marginal integrity remains an important predictive tool for clinical outcome at restoration margins. ultrasonic instrumentation for root debridement, on changes in periodontal clinical parameters.Microleakage is a cause of restorative treatment failure and allows the passage of bacteria, oral fluids, molecules from the restoration and cavity walls. The vibration of scaler tips is the main effect to remove the deposits from the dental surface and there will be a constant flushing activity of the lavage used to cool the tips and cavitational activity which cause disruption of the weak and unattached subgingival plaque.