Composite Repair Using Silane Coupling Agent

Clinical Performance of Repaired Resin Composite Restorations Using Separate Silane Coupling Agent Versus Adhesives Containing Regular or Acid Resistance Silane: A Randomized Controlled Trial

Evaluation the influence of the use of silane coupling agent application as a separate step versus application of silane or acid resistance silane containing adhesives on the clinical performance of repaired posterior resin composite restorations according to Modified United States Public Health Service (USPHS) criteria over one year.

some manufacturers have produced silane-containing adhesives in their new products, which might eliminate the need to apply separate silane. However, this silane coupling agent can be hydrolyzed by the acidic monomer in the adhesive making it useless. Acid resistance silane containing adhesive is the update version of the silane containing adhesive which provides a long lasting effective bond between the old and new resin composite restorations

Inclusion Criteria:

• Participants Inclusion:

Patients aging (18-45). Patients with a high level of oral hygiene. Patients with good likelihood of recall availability. - Teeth Inclusion: The restorations were first placed 12 to 24 months ago. Teeth with healthy remaining tooth structure. Posterior restorations with approximately 3mm in size occlusal marginal defect. Asymptomatic teeth before repair.

Exclusion Criteria:

• Participants Exclusion:

Patient with high caries risk Patient with poor periodontal health. Heavy bruxism habits. Pregnant or lactating females.

-Teeth Exclusion: The restorations with large defects The restorations in the third molars Last experience with allergic reactions against any components of the used materials.

Patients receiving orthodontic treatment