Effect of Different Adhesion Strategies on Bond Strength of Resin Composite

Zubeir, V. (2009) Effect of Different Adhesion Strategies on Bond Strength of Resin Composite. thesis, Dentistry.

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Abstract

SUMMARY Purpose: Service life of discoloured and abraded resin composite restorations could be prolonged by repair or relayering actions. Composite-composite adhesion could be achieved successfully using some surface conditioning methods but the most effective adhesion protocol is not known when the composite restorations with surrounding dentin have to be relayered. This study evaluated the effect of three adhesion strategies on the bond strength of resin composite to composite-dentin complex. Materials and Methods: Intact maxillary central incisors (N=72, n=8 per subgroup) were collected and the roots of the teeth were removed under coolant water. The coronal parts of the teeth were embedded in auto-polymerized poly(methylmethacrylate) surrounded by a PVC cylinder. Cylindrical cavities (diameter: 2.6 mm, depth: 2 mm) were opened in the middle of the labial surfaces of the teeth using a standard diamond bur and the specimens were randomly divided into 3 groups. Two types of resin composites, namely microhybrid (Quadrant Anterior Shine-AS) and nanohybrid (Grandio-G) were photo-polymerized incrementally in the cavities according to each manufacturer's recommendations. The composite-enamel surfaces were ground finished to 1200 grit silicone carbide paper until dentin exposed. The surfaces of the substrate composites and the surrounding dentin were conditioned according to one of the adhesion protocols: Protocol 1: Acid etching (dentin )+silica coating (composite )+silanization (composite )+primer (dentin )+bonding agent (dentin+composite), Protocol 2: Silica coating (composite)+Acid etching (dentin)+silanization (composite)+primer (dentin)+bonding agent (dentin+composite), Protocol 3: Acid etching (dentin)+primer (dentin)+silanization (composite)+bonding agent (dentin+composite). Primer and the bonding agents were the corresponding materials of the composite manufacturer. Silica-coating (CoJet sand, 30 tJm) was achieved using a chairside air-abrasion device (distance:1 0 mm, duration: 4 s in circling motion). The substrate-adherend combinations were as follows: AS-AS; G-G, AS-G. Shear force was applied to the adhesive interface in a Universal After conditioning protocols, the repair resin was adhered to the substrate surfaces using transparent polyethylene molds (diameter: 3.6 mm) incrementally and photo-polymerized.Testing Machine (cross-head speed: 1 mm/min). The types of failures were further evaluated and categorized as; A) cohesive in the composite substrate, B) adhesive at the interface. Bond strength values (MPa) were statistically analyzed using two-way ANOVA and LSD post-hoc tests (a = 0.05). Results: Significant effects of the adhesion strategy (p=0.006) and the composite type (p=O.OOO) were found. Interaction terms was not significant (p=0.292). Regardless of the substrate-adherend combination, Protocol 1 (17-22) showed significantly higher results than those of Protocol 2 (15- 17) and 3 (11-17) (p=0.028, p=0.002, respectively). Protocol 3 presented the lowest results (11- 17). The highest results were obtained from G-G combination after all three protocols (17-22). The incidence of cohesive failures were more common when the substrate and the adherend were the same composite type (AS-AS: 87.5, 87.5, 75°/o, G-G: 100, 75, 50°/o, for Protocol 1 ,2,3, respectively). When substrate and adherend were used interchanged, adhesive failures were more frequent (25, 50, 1 OOo/o for Protocol 1 ,2,3, respectively). Conclusion: When the substrate and the adherend are the same kind, higher repair strength could be expected. In the repair of composites next to the dentin depending on the composite type, conditioning the composite with silicatization either before or after dentin condioning adds to the repair strength than without.

Item Type:	Thesis (Thesis)
Supervisor name:	Supervisor: and to Composite-dentin Complex and Ozcan, Mutlu Dr.med.dent. and Oral Hygiene, Clinical Dental Biomaterials
Faculty:	Medical Sciences
Date Deposited:	25 Jun 2020 10:50
Last Modified:	25 Jun 2020 10:50
URI:	https://umcg.studenttheses.ub.rug.nl/id/eprint/1154

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