Influence of thermal and mechanical load cycling on fracture resistance of premolars filled with calcium silicate sealer

• Main Authors: Smran, Ahlam, Abdullah, Mariam, Ahmad, Norasmatul Akma, AL-Maflehi, Nassr, Samran, Abdulaziz
• Format: Article
• Published: MDPI 2023
• Subjects: R Medicine; RK Dentistry; Oral surgery
• Online Access: http://eprints.um.edu.my/38371/
• Institution: Universiti Malaya

The aim of this study was to evaluate the aging effect of thermomechanical cyclic load on fracture resistance of lower premolars obturated with AH Plus and BioRoot RCS root canal sealers. Forty-eight single-rooted premolars teeth were instrumented with REVO-S files up to SU/0.06 taper. The teeth were randomly assigned into 2 main groups (n = 24) according to the selected two root canal sealers (AH Plus or BioRoot RCS). All teeth were obturated using matching gutta-percha. Each main group were further divided into 3 subgroups (A, B and C) (n = 8). Group A acted as the negative control group (non-Thermomechanical aging). Whereas Group B and C were subjected first to thermal variations in a thermal cycling machine (7500 and 15,000 thermal cycles), then two different dynamic loading periods namely 3 x 10(5) and 6 x 10(5) in a masticatory simulator with a nominal load of 5 kg at 1.2 Hz which simulate approximately 1 1/2 and 3 years of clinical function respectively. The roots were decoronated and fracture resistan