The present study was undertaken for assessing the impact of desensitizing agents on the retention of crowns cemented with luting agents. 40 freshly extracted mandibular molar teeth were selected. Two study groups were made: Group C: Control group-Glass ionomer cement; and Group G: Study group-GC Tooth Mousse desensitizer. Crowns were fabricated and were subjected under universal force testing machine. All the results were recorded in Microsoft excel sheet and were analyzed by SPSS software. Mean tensile bond strength of group C specimens was 49.1 Kg while mean tensile strength of Group 2 specimens was 47.1 Kg respectively. While comparing statistically, non-significant results were obtained. Application of desensitizing agents may be designated during fabrication of crowns as it will not affect the retentive ability of the luting cements.
Aim: Comparative evaluation of the fracture resistance of maxillary molar teeth restored with recent composite resins. Materials and Methods: Fifty freshly extracted molar teeth were selected. Ten specimens served as control –unrestored, unprepared, intact (Group 1). Mesio-occluso-distal cavity preparation was prepared on the rest of the specimens. These specimens were further divided into four groups: prepared but unrestored (Group 2), teeth restored with with Nano hybrid composite (Tetric N-Ceram, Ivoclar Vivadent). (Group 3), teeth restored with Micro hybrid composite (Polofil supra). (Group 4), and teeth restored with Nano filled composite (Filtek Z-350). (Group 5). The specimens were then subjected to compressive axial load using universal testing machine. Data were analyzed using data were analyzed using Statistical package for social sciences software (SPSS v 20.0, IBM Corp.) Results: The positive control group exhibited highest fracture load (377±63.8 Kg-force). There was less difference seen in between the all recent composite resins (P > 0.05). There is significant difference noted in fracture load between control group and treatment groups Conclusion: Type of the composite restoration makes little difference in the fracture toughness while restoring MOD cavities.
Background: The present study was conducted of assessing the prognosis of post and core supported crowns. Materials & methods: A total of 100 patients who underwent post and core treatment for dental rehabilitation were enrolled. the patients underwent post and core treatment. Radiographic assessment was done on subsequent follow-up. Both clinical and radiographic evaluation of all the patients was done for assessing the prognosis. Results were compiled in Microsoft excel sheet and were analyzed by SPSS software. Results: Out of 100 patients, successful prognosis of post and core treatment was seen in 93 percent of the patients while failure was seen in 7 percent of the patients. Non-significant results were obtained while assessing the correlation of prognosis with site. Conclusion: When done with adequate precaution, post and core treatment has good prognosis.
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