A comparative evaluation of the marginal adaptation of a thermoplastic resin, a light cured wax and an inlay casting wax on stone dies: An in vitro study.

BACKGROUND: Different pattern materials do not produce copings with satisfactory, marginal accuracy when used on stone dies at varying time intervals. PURPOSE: The purpose of this study was to evaluate and compare the vertical marginal accuracy of patterns formed from three materials, namely, thermoplastic resin, light cured wax and inlay casting wax at three-time intervals of 1, 12, and 24 h. METHODOLOGY: A master die (zirconia abutment mimicking a prepared permanent maxillary central incisor) and metal sleeve (direct metal laser sintering crown #11) were fabricated. A total of 30 stone dies were obtained from the master die. Ten patterns were made each from the three materials and stored off the die at room temperature. The vertical marginal gaps were measured using digital microscope at 1, 12, and 24 h after reseating with gentle finger pressure. RESULTS: The results revealed a significant statistical difference in the marginal adaptation of three materials at all the three-time intervals. Light cured wax was found to be most accurate at all time intervals, followed by thermoplastic resin and inlay casting wax. Furthermore, there was a significant difference between all pairs of materials. The change in vertical marginal gap from 1 to 24 h between thermoplastic resin and light cured wax was not statistically significant. CONCLUSION: The marginal adaptation of all the three materials used, was well within the acceptable range of 25-70 µm. The resin pattern materials studied revealed significantly less dimensional change than inlay casting wax on storage at 1, 12, and 24 h time intervals. They may be employed in situations where high precision and delayed investing is expected.

Endodontic management of a patient with Bernard-Soulier syndrome.

Bernard-Soulier syndrome is a rare inherited disorder with giant platelets, thrombocytopenia and a prolonged bleeding time. These abnormalities are caused by genetic defects of the glycoprotein Ib/IX/V complex that constitutes the von Willebrand factor receptor on the platelet surface. We are documenting a 30-year-old female patient reported with a chief complaint of swelling in relation to right maxillary canine for 5 days. The primary treatment remains platelet transfusion. Root canal treatment was performed following platelet rich plasma transfusion. As the tooth was necrotic and had a periapical pathology post-operative bleeding was absent. The root canal treatment was uneventful and the patient was asymptomatic. Optimum oral hygiene practices were emphasized to avoid dental diseases.