Abstract
The aim of the present study was to compare the effects of Nd:YAG laser application in root canals on bond strengths of fiber posts. Thirty single-rooted bovines were randomly divided into three groups (n=10); root canal instrumentation was performed, and pretreatment was conducted as follows: C group: conventional treatment (without laser irradiation); ALC group: Nd:YAG laser was applied after adhesive; and LAC group: Nd:YAG laser was applied before adhesive. The fiber posts Rebilda 15 DC (Voco) were cemented with an adhesive system and resin cement, in accordance with the manufacturer’s instructions. Six slices with 1.0mm height was obtained for of each root and bond strength was measured by push-out test using a universal testing machine (0.5 mm/min). Data were analyzed using Kruskal-Wallis and Dunn’s tests (p <0.05). Push-out bond strengths to root canal dentin were affected by the type of treatment and root third. The use of Nd:YAG laser after the application of adhesive system had a higher bonding performance compared with the use of laser before the application. Also, cervical and medium third presented higher bond strength values than the apical third. It must be conclude that the laser irradiation over the non-cured adhesive system is more efficient for increase in bond strength than the irradiation after the application of the adhesive. However, the use of 60mJ of laser energy is not sufficient to improve the bonding performance.
Highlights
IntroductionThe longitudinal success of restorative rehabilitations of endodontically treated teeth depend upon the result of the bonding quality between fibers reinforced posts and composite cores and / or luting agents [1]
The longitudinal success of restorative rehabilitations of endodontically treated teeth depend upon the result of the bonding quality between fibers reinforced posts and composite cores and / or luting agents [1].Usually the rehabilitation of endodontically treated teeth with great structural loss requires the use of posts for core retention
Adhesive luting is recommended for rehabilitation with fiberglass posts, and the formation of a hybrid layer as well as resin tags to the root canal dentin had been shown [5], debonding is the most common failure of these restorations [2,6], due to the high C-factor [7]
Summary
The longitudinal success of restorative rehabilitations of endodontically treated teeth depend upon the result of the bonding quality between fibers reinforced posts and composite cores and / or luting agents [1]. The rehabilitation of endodontically treated teeth with great structural loss requires the use of posts for core retention. The use of fiber-reinforced posts have become popular mainly because their mechanical advantages, such as elastic modulus similar to dentin, reducing the risk of root fractures [2]. Adhesive luting is recommended for rehabilitation with fiberglass posts, and the formation of a hybrid layer as well as resin tags to the root canal dentin had been shown [5], debonding is the most common failure of these restorations [2,6], due to the high C-factor [7]. In order to improve bonding of fiberglass posts, many studies have investigated the effect of pretreatments in their surface [8,9,10,11], the pretreatment of root dentin still remains uncertain
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