Push-out Bond Strength between Resin Core Material and Root Canal Dentin Contaminated by Different Types of Root Canal Sealers
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Abstract
The aim of this study was to evaluate the effect of different root canal sealers contaminated in the root canal on the push-out bond strength between resin core material and root canal dentin. Forty-eight extracted single-rooted mandibular premolar teeth were randomly divided into four groups (n=12): group 1: control group, gutta-percha point only (no sealer); group 2: gutta-percha with zinc oxide eugenol-based sealer (MU sealer, M dent); group 3: gutta-percha with resin-based sealer (AH Plus®, Dentsply); group 4: gutta-percha with calcium hydroxide-based sealer (Apexit®Plus, Ivoclar Vivadent). The root canals were obturated with gutta-percha using warm vertical condensation technique and immediately restored with resin core material. The specimens were sectioned into 1 mm thick at the cervical and middle level of root canals. The push-out test was performed using a universal testing machine. The push-out pin diameter was 0.8 mm and 0.5 mm for testing at the coronal and the middle part of root. Failure mode was observed and classified into 3 types: adhesive, cohesive, and mixed failure. Data was statistically analysed by using Welch one-way ANOVA and Games-Howell test. There were significant differences of bond strength among most of the experimental groups at both cervical and middle levels (p<0.05). Except the coronal part, no significant difference was detected between AH Plus®- MU sealer groups and AH Plus®- Apexit® Plus sealer groups, and at the middle part, no significant difference was found between control - Apexit® Plus sealer groups and AH Plus®- MU sealer groups. The control group had the highest mean push-out bond strength at coronal and middle parts respectively (1.62±0.9, 1.43±0.74 MPa), followed by the Apexit® Plus sealer group (0.75±0.18, 0.97±0.50 MPa), AH Plus® sealer group (0.50±0.24, 0.38±0.18 MPa), and MU sealer group (0.27±0.09, 0.17±0.09 MPa). The predominant mode of failure was the adhesive failure while cohesive failure was not exhibited. It can be concluded that the contamination of different types of root canal sealers critically affected the push-out bond strength of resin core material in the root canal. The eugenol-based sealer had the strongest adverse effect on bond strength.
Article Details
บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการลงตีพิมพ์ในวิทยาสารทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นถือเป็นลิขสิทธิ์เฉพาะของคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่น หากบุคคลหรือหน่วยงานใดต้องการนำทั้งหมดหรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อหรือเพื่อกระทำการใด ๆ จะต้องได้รับอนุญาตเป็นลายลักษณ์อักษร จากคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นก่อนเท่านั้น
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