Mini-interfacial Fracture Toughness of a Multimode Adhesive Bonded to Plasma-treated Dentin

Author(s)

Almeida Ayres, Ana Paula ^{[1, 2]} ; Pongprueksa, Pong ^[3] ; De Munck, Jan ^{[1, 4]} ; Gre, Cristina Parise ^{[1, 4]} ; Nascimento, Fabio Dupart ^[5] ; Giannini, Marcelo ^[6] ; Van Meerbeek, Bart ^{[1, 4]}

Affiliation

^[1] Univ Leuven, KU Leuven, BIOMAT, Dept Oral Hlth Sci, Kapucijnenvoer 7, Blok A, Box 7001, B-3000 Leuven - Belgium

^[2] Piracicaba Dent Sch, Dept Dent Mat, Piracicaba, SP - Brazil

^[3] Mahidol Univ, Dept Operat Dent & Endodont, Bangkok - Thailand

^[4] Univ Hosp Leuven, Dent, Leuven - Belgium

^[5] Univ Mogi das Cruzes, Ctr Interdisciplinary Biochem Res, Mogi Das Cruzes, SP - Brazil

^[6] State Univ Campinas UNICAMP, Piracicaba Dent Sch, Dept Restorat Dent, Piracicaba, SP - Brazil

• Document type: Journal article
• Source: Journal of Adhesive Dentistry; v. 19, n. 5, p. 409-416, 2017.
• Web of Science Citations: 2

Abstract

Purpose: To investigate the bonding efficacy of a multimode adhesive to plasma-treated and -untreated (control) dentin using a mini-interfacial fracture toughness (mini-iFT) test. Materials and Methods: Twenty human molars were used in a split-tooth design (n = 10). The adhesive Scotch-bond Universal (SBU; 3M ESPE) was applied in etch-and-rinse (E\&R) and self-etch (SE) modes. Mid-coronal dentin was exposed and covered with a standardized smear layer ground to 320 grit. One half of each dentin surface received 15 s of non-thermal atmospheric plasma (NTAP), while the other half was covered with a metallic barrier and kept untreated. Following the E\&R mode, dentin was plasma treated immediately after phosphoric acid etching. SBU and a resin-based composite were applied to dentin following the manufacturer's instructions. Six mini-iFT specimens were prepared per tooth (1.5 x 2.0 x 16 to 18 mm), and a single notch was prepared at the adhesive-dentin interface using a 150-mu m diamond blade under water cooling. Half of the mini-iFT specimens were immediately loaded until failure in a 4-point bending test, while the other half were first stored in distilled water for 6 months. After testing, the exact dimensions of the notch were measured with a measuring optical microscope, from which K-lc was determined. Results: Three-way ANOVA revealed higher mini-iFT for SBU applied in E\&R than SE mode for both storage times, irrespective of NTAP treatment. Conclusion: Overall, mini-iFT did not decrease for any of the experimental groups upon 6-month aging, while plasma treatment did not show a direct beneficial effect on mini-iFT of SBU applied in either E\&R or SE mode. (AU)

• FAPESP's process: 15/05939-9 - Influence of non-thermal atmospheric pressure plasma on resin-dentin interface
• Grantee: Ana Paula Almeida Ayres
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate