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Background and Objective: Renewal MI (RMI) is a new self-adhesive composite resin developed from the users’ perspectives as alternative filling material for special needs patients. This study aimed to examine fracture resistance of Renewal MI in comparison to the conventional composite resin, conventional glass ionomer, and Renewal MI with adhesive, when subjected to thermocycling at 5,000 and 10,000 cycles.
Methods: Fifty premolars were divided into ten groups (N=5/group). The control group (CT) was intact teeth and negative control group were filled with IRM. Except for CT group, the class II MOD cavity was prepared and underwent chemically-induced caries process. Groups 1 was restored with Filtek Z350XT; groups 2 – Fuji IX; groups 3 - RMI and groups 4 - RMI and Universal adhesive. Five teeth/group were randomly assigned to thermocycling process at 5,000 cycles and another five teeth/group at 10,000 cycles. Specimens were tested under the Universal testing machine using a rounded stainless-steel diameter-3-mm tip. One-way ANOVA and Bonferroni testes were used to determine difference between groups. Independent T-test was used to determine difference between the thermocycling 5,000 and 10,000 cycles.
Results: There was no statistical difference between four experimental groups, either at 5,000 or 10,000 cycles. Comparison within material group, between at 5,000 and 10,000 cycles, also showed no significant difference. The least number of unfavorable failure was found in composite resin groups.
Conclusion: Renewal MI, with or without adhesive, restored in MOD cavities and demineralized dentin, has comparable fracture resistance to conventional restorative materials, but has higher ratio of unfavorable failure.
Keywords: class II MOD, demineralized dentin, fracture resistance, thermocycling, self-adhesive composite
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