Effects of anaerobic sealing agents on preload maintenance ofscrew-retained implant prosthesis with surface of screws / 대한치과보철학회지

Purpose@#The purpose of this study was to evaluate the preload maintenance of the retaining screw when using anaerobic sealing agents in implant fixture and abutmentcomponents. Specifically, the study examines the effects of anaerobic sealing agents on different types of screws. Materials and methods: External hexagon implants madeof titanium and anti-rotational abutments were used. Titanium abutment screws and ebony abutment screws from the same manufacturer were used. The experiment wasdivided into four groups (n = 10 in each group). In the control group, no sealing agent was used at the implant fixture and abutment screw interface. All abutment screws weretightened according to the manufacturer’s recommended torque (30 N.cm). After 24 hours, the removal torque (detorque) of each screw was measured using a digital torquegauge device. The data were analyzed by two-way ANOVA test according to normality distribution satisfaction. Results: Looking at the results for each group, titaniumscrews and no treatment showed detorque values of 20.3 ± 1.6 N.cm. titanium screws and applied anaerobic sealing agent showed detorque values of 32.4 ± 6.7 N.cm. Ebonyscrews and no treatment showed detorque values of 20.2 ± 1.5 N.cm. ebony screws and applied anaerobic sealing agent showed detorque values of 30.4 ± 4.5 N.cm. @*Conclusion@#The detorque value was higher in the case of using anaerobic sealing agents in both the titanium screw and ebony screw groups. But there was no differencebetween the two screws. (J Korean Acad Prosthodont 2020;58:103-9)

Prosthetic rehabilitation of soft palate resection edentulous patient with maxillary obturator / 대한치과보철학회지

This report is a case of 76-year old male patient who had difficulty in swallowing, pronunciation and suffered regurgitation of food. The patient lacks uvula and both tonsils, had short palatoglossal arch and soft palate, as well as defective left palatopharyngeal arch. The height and width of the soft palate defect were measured by reconstructing the Computed Tomography (CT) image in three dimensions. Phonation and soft palate obstructing ability were examined by nasometry and nasal endoscopy. Evaluations on phonetics and swallowing were done and improvements were shown. The patient was satisfied with the results of treatment.