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Evaluation of the Fracture Resistance of Conservative and Ultraconservative Access Cavity Designs With Different Treatment Modalities: An in Vitro Study Publisher Pubmed



Shirani F1 ; Saatchi M2 ; Shirani M3 ; Jafari N4
Authors
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Authors Affiliations
  1. 1. Department of Restorative Dentistry, Dental Research Centre, Dental Research Institute, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
  2. 2. Dental Research Centre, Department of Endodontics, Dental Research Institute, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
  3. 3. School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
  4. 4. Department of Restorative Dentistry, School of Dentistry, Rafsanjan University of Medical Sciences, Rafsanjan, Iran

Source: BioMed Research International Published:2023


Abstract

Introduction. The aim of this study was to evaluate the fracture resistance of endodontically treated mandibular molars using traditional and conservative access cavity preparation. Materials and Methods. In this in vitro study, 100 extracted healthy human mandibular molars were selected and divided into 10 groups (n=10). Healthy teeth in one group were considered the control group. In three groups, traditional access cavity preparation was done (groups A) without two marginal ridges (A1), with one marginal ridge (A2), and with two marginal ridges (A3). In three groups (group B), two separate access cavities with a dentinoenamel roof without two marginal ridges (B1), with one marginal ridge (B2), and with two marginal ridges (B3) were prepared. In three other groups (groups C), two separate access cavities were prepared only with a dentinal roof without two marginal ridges (C1), with one marginal ridge (C2), and with two marginal ridges (C3), on which root canal treatment was performed afterward. Then, these teeth were subjected to force until fracture. The fracture force and fracture mode of each tooth were recorded and compared between groups by ANOVA, Tukey's post hoc, and chi-square tests using SPSS ver. 23 (IBM, Somers, NJ, USA). Results. The control teeth had the highest mean fracture force (2804.5±338.5 N), followed by a conservative access cavity with a dentinoenamel roof and two marginal ridges (2360.4±181.72 N) and a conservative access cavity with a dentinoenamel roof and one marginal ridge (1812.8±263.9 N), respectively. The lowest mean fracture force was found for the conventional access cavity group without two marginal ridges (399.4±95.2 N). Conclusion. In the condition of this study, with two separate access cavities in mandibular molars and maintenance of the marginal ridges, it is possible to provide teeth with higher fracture resistance against occlusal forces. © 2023 Farzaneh Shirani et al.
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