Effect of thermal and mechanical load cycling on dentin bond strength of a self-etch resin luting cement


Selcuk Dental Journal, vol.4, no.2, pp.36-43, 2017 (Peer-Reviewed Journal) identifier

  • Publication Type: Article / Article
  • Volume: 4 Issue: 2
  • Publication Date: 2017
  • Journal Name: Selcuk Dental Journal
  • Journal Indexes: TR DİZİN (ULAKBİM)
  • Page Numbers: pp.36-43
  • Istanbul Medipol University Affiliated: Yes


Background: The aim of this study is to evaluate the effects of cyclic thermal and mechanical loads on dentin bond strength of a self-etch resin luting cement under in vitro conditions. Methods: Inlay cavities were prepared on 18 caries-free human mandibular third molars. Restorations were fabricated by using feldspathic porcelain (Vita VM9). Bonding was achieved by using a dual-cure, self-etch resin luting cement (Clearfil Esthetic Cement). Teeth were then randomly divided into 3 groups: Group I: Control group (no thermal or mechanical cycling). Group II: Thermal cycling (thermocycling for 5.000 cycles). Group III: Mechanical load cycling (1.200.000 cycles). Two Ishape sectioned longitudinal cuts were prepared from each tooth (n:12). Total of thirty-six specimens were subjected to tensile forces at a crosshead speed of 1 mm/min, and the maximum load at fracture was recorded. Fracture sites were observed with a stereomicroscope (Olympus, SZ-PT) to identify the failure mode. One tooth from each group was prepared for SEM analysis and interfaces were observed under SEM (435 VP; Leo SEM Products). Results: One-way ANOVA revealed that there were significant differences among the groups (p<0.05). Also, Tukey’s HSD analysis showed that the mean MTBS of Group III was significantly lower than other groups (p<0.05). The difference between Group I and Group II was not significant (p>0.05). Conclusion: In this study the principal failure type was found to be interfacial (adhesive) for all groups. Additionally, mechanical loads were observed to be effective on bonding stability while temperature alterations were not significantly influential.