Flexural Strength of Bioactive Restorative Materials after Thermal Cycling
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Abstract
Objective: The purpose of this study was to evaluate the flexural strength (FS) of Bioactive Restorative materials: Cention N (CN) and Activa (AB) compared to FiltekZ350XT universal resin composite (FZ) after thermal cycling (TC) at 0, 10,000 and 20,000 cycles.
Materials and Methods: Thirty specimens of each material were prepared into 2(±0.1)x2(±0.1)x25(±2) millimeter dimensions in an acrylic mold and stored in distilled water at 37 °c for 24 hours. They were then divided into three subgroups: 0, 10,000, and 20,000 cycles of TC (n=10 each). The specimens were subjected to TC ranging from 5°C to 55°C, 30 seconds dwell time. The FS of all specimens was evaluated using a 3-point bending test at a cross-head speed of 1 mm/min. The mean FS values were analyzed using two-way ANOVA and pairwise comparisons using Bonferroni post hoc tests with a 95% confidence level.
Results: The results revealed that both the type of material and the number of TC cycles significantly affected FS values (p=0.037). Without TC, the mean FS values of CN, AB, and FZ were not significantly different (p>0.05). After 20,000 TC cycles, CN exhibited significantly higher FS values than AB and FZ (p<0.05). In contrast, the FS values of AB and FZ did not differ significantly in any TC cycle group (p>0.05). Additionally, the mean FS values of all three materials without TC were significantly higher than those after 10,000 and 20,000 TC cycles (p<0.05), while the difference between 10,000 and 20,000 TC cycles was not statistically significant (p>0.05).
Conclusion: This study found that after 10,000 and 20,000 TC cycles, the mean FS values of all three materials decreased significantly (p<0.05). Alkasite bioactive material exhibited significantly higher FS values than bioactive resin and universal resin composite after 20,000 TC cycles.
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บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการลงตีพิมพ์ในวิทยาสารทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นถือเป็นลิขสิทธิ์เฉพาะของคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่น หากบุคคลหรือหน่วยงานใดต้องการนำทั้งหมดหรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อหรือเพื่อกระทำการใด ๆ จะต้องได้รับอนุญาตเป็นลายลักษณ์อักษร จากคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นก่อนเท่านั้น
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