Fahad K Alwthinani¹, Nouf Al Humayyani¹, Abdulrahman H. Alzahrani¹, Abdulmajeed O Alotaibi¹, Mohamed Y. Abdelfattah^{2, 3,}

Aim: This laboratory research aimed to assess the impact of artificial aging and 3 dissimilar primers on peel bond strength and bond failure pattern of (RTV) M511 Platinum silicone and heat polymerizing PMMA. Materials and Methods: 80 heat-polymerizing PMMA samples, with dimensions 75mm×10mm×3mm were constructed, then allocated into 4 main groups I,II,III and IV based on the primers (No Primer(control), A-330-G, A 304 , and G611 ) utilized to adhere REF M511 Platinum silicone elastomers to acrylic resin samples. All groups were sectioned into 2 subdivisions; subgroup (a): base line (n = 10) were tested in a testing machine after 24 hours and subgroup (b) (n = 10) were tested subsequently to 360 hours of subjecting them to artificial ageing conditions. The assessments were steered at a crossheading speediness of 10 mm/min till peel and bond failure occurred. Exploration of the test readings was conducted using One-way ANOVA, Tukey’s tests, and Independent t-test. Results: There were important influences of adhesive primers on peel resistance at both baseline and after 36h artificial aging, Peel outcomes vacillated between 0.76 and 4.75 at baseline and between 0.092 and 7.33 N/mm at after aging. At base line, (G611) Primer revealed the top peel value (4.35 N/mm), while after aging, the primer (A330-G) displayed the highest value (7.33 N/mm). Failure pattern was mainly cohesive (71.2%), and adhesive (28.8%), at baseline, while it was mainly adhesive (81.3%), and cohesive (18.7%) after 360h of artificial aging process. Conclusion: Best bond values achieved for peel, was achieved using the primers (G611) at the base line and (A330-G) after aging. Consequently, the most favorable combinations between silicone and primer based on bond strengths values were the combination of REF M511 Platinum silicone elastomers and G611 primer and primer A330-G.at the baseline and after aging respectively.

silicone maxillofacial elastomers, peel bond strength, artificial aging