Effect of different periodontal ligament simulating materials on the incidence of dentinal cracks during root canal preparation

Abstract

Background. The present study was undertaken to evaluate the incidence of dentinal cracks during root canal preparation with different periodontal ligament simulating materials in vitro. Methods. Seventy freshly extracted human mandibular first premolars were selected and divided into 7 groups in terms of simulating material: group 1: polyether impression material; group 2: polyvinyl acetate adhesive; group 3: polyvinyl siloxane impression material; group 4: cyanoacrylate adhesive; group 5: epoxy resin adhesive; group 6: positive control, without any periodontal ligament simulation; and group 7: negative control, where neither a periodontal ligament simulating material was used nor canal preparation was carried out. Root canal preparation was carried out in all the groups followed by sectioning of roots at 3 mm, 6 mm and 9 mm. The sections were evaluated under a stereomicroscope at ×2.5 for the presence or absence of cracks. Chi-squared test was used to compare the appearance of defective roots between the different experimental groups. Results. The least number of cracks were found in the negative control group, followed by group 1 where polyether impression material was used for periodontal ligament simulation. The difference was significant with a P-value of 0.002 for coronal sections. Conclusion. Under the limitation of the present study, polyether and polyvinyl siloxane (light body) can both be used for simulation of periodontal ligament.

<p>Evaluating Fracture Resistance And Failure Modes Of Root Filled Teeth Restored With CAD/CAM-Fabricated Post And Core</p>

“…Then, the tooth was embedded in self-polymerized acrylic resin to 2.0 mm below the coronal level. Thereafter, the root was removed from the acrylic block, and the wax was replaced with polyvinyl silicon impression material (Honigum Light, DMG, Hamburg, Germany), which represents the periodontal ligament 21,22…”

Fracture Resistance Evaluation and Failure Modes Rating Agreement for Two Endocrown Designs: An In Vitro Study

“…Without simulating such an effect, load test results would be misleadingly high [55]. In the current study, polyvinyl siloxane material was used to simulate the PDL, which was demonstrated to be a good option by Rathi et al [42]. In the current study, acrylic resin with an elastic modulus of around 2000 MPa [56] was used to embed the teeth, resembling the alveolar bone [43,57].…”

“…The root portion of the teeth was covered with a thin layer (0.35 mm) of light polyvinyl siloxane material (Virtual extra light body, Ivoclar Vivadent, Schaan, Liechtenstein) to simulate the periodontal ligament [42]. Then, the teeth were embedded in auto-polymerizing acrylic denture base resin (Probase Cold, Ivoclar Vivadent, Schaan, Liechtenstein) at 2 mm apical to the cementoenamel junction (CEJ) to simulate alveolar bone level [43].…”

Effect of Design and Surface Treatments on Fracture Resistance of Zirconia Inlay-Retained Fixed Dental Prosthesis After Thermo-Mechanical Cycling: An In Vitro Study

“…To imitate physiological tooth mobility, all roots of the selected teeth which were covered with an artificial periodontal membrane to simulate the movement of a tooth with a healthy periodontium. This layer made a thin layer (0.3mm-0.5mm thickness) of poly vinyl acetate (PVA) (22) , this technique used as it simple and allows to get a uniform thickness of the material all over the entire surface of the root.…”