Abstract
ObjectivesThe aim of this study was to evaluate the effectiveness of different fiber post removal techniques and to correlate dentinal loss with microcrack formation.Materials and methodsForty-five extracted single-rooted teeth were root canal treated and fiber posts were adhesively luted. Specimens were divided into three groups (n = 15) according to the removal technique: long-shaft round bur (EndoTracer #08, Komet, Lemgo, Germany), SonicFlex Endo (KaVo, Biberach, Germany), DT Post Removal Kit (VDW, Munich, Germany). Roots were scanned before post cementation and after post removal using micro-computed tomography. Dentin loss, residual luting material, working time, and the induction of microcracks were assessed. Statistical analysis was performed by using multiple contrast tests (max-t tests, α = 0.05). Correlations between parameters dentin loss/new microcracks and dentin loss/residual material were calculated using Kendall’s tau.ResultsPost removal with SonicFlex Endo resulted in the highest amount of removed dentin with significant differences to the round bur and the DT Post Removal Kit. No technique was found to completely remove the post and luting material. All techniques induced microcracks with the DT Post Removal Kit presenting the highest number of new defects. No correlation between dentin loss and new microcracks was observed. Deviations from the original root canal occurred in all groups, but no perforation was observed.ConclusionsAll techniques resulted in dentin loss, residual luting material, and the formation of microcracks. However, no correlation between dentin loss and the induction of microcracks was observed.Clinical relevanceAs all techniques resulted in microcrack formation and dentin loss, this study emphasizes the risk of iatrogenic damage due to post removal procedures.
Highlights
During the last decades, fiber posts in combination with composite cores have gained more popularity for reconstruction of teeth with extensive hard tissue loss [1, 2]
Previous studies have investigated the effectiveness of post removal techniques considering the amount of dentin loss and residual luting material [19,20,21]
Deviations from the original root canal occurred in all groups
Summary
Fiber posts in combination with composite cores have gained more popularity for reconstruction of teeth with extensive hard tissue loss [1, 2]. Clinical Oral Investigations microcrack induction due to post removal procedures [11, 18]. Previous studies have investigated the effectiveness of post removal techniques considering the amount of dentin loss and residual luting material [19,20,21]. There is an absence of evidence regarding the interrelations between tooth substance loss due to different removal techniques and formation of dentinal defects. The first aim of this study was to evaluate the induction of dentinal microcracks due to post removal procedures. The effectiveness of three different removal techniques in terms of dentin removal, residual luting material, and working time was assessed. Two null hypotheses were formulated: All post removal techniques perform regarding their effectiveness and induction of dentinal defects. There are no correlations between the following parameters: dentin loss/new microcracks and dentin loss/residual luting material
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