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Background and Aim: Cementation for attaching crowns to implants has found wider use due to various reasons, including clinical advantages and aesthetic preservation. However, cement-retained prostheses have drawbacks such as the possibility of excess cement and its leakage into the surrounding tissues of the implant, which can lead to inflammatory complications in these tissues. The use of the extra-oral cementation technique can minimize excess cement. Accordingly, in this laboratory study, two extra-oral methods, PIA (Putty Index Analogue) and LBA (Light Body Analogue), and the conventional intra-oral cementation method were compared in terms of the amount of excess cement leakage when placing a crown on an implant model. Materials and Methods: In this laboratory study, 30 zirconia frameworks were fabricated on three abutmentanalogue sets for three study groups. The control group underwent the conventional intra-oral cementation method. The LBA group used a light body condensation silicone. The PIA group used a silicone putty for cementation. In each group, after cementation, the excess cement around the abutment-crown connection was manually removed using a dental scaler and weighed with a digital scale with an accuracy of ±0.01 mg. Results: The excess cement in the control group was reported as 85.23 ± 13.07 mg, in the LBA group as 1.70 ± 0.55 mg, and in the PTA group as 7.11 ± 1.45 mg. The average excess cement in the LBA and PTA groups was significantly lower than in the control group (both groups with p value < 0.001). However, the difference in average excess cement between the LBA and PTA groups was not statistically significant (p value = 0.265). Conclusion: The extra-oral cementation techniques, PIA and LBA, significantly reduced the amount of excess cement compared to the conventional technique in implant-based restorations, which may limit the adverse effects of excess cement on surrounding tissues.. [ABSTRACT FROM AUTHOR]

Background and Aim: Periodontal surgeries complications and related factors are one of the most important things that surgeons in each clinic should be aware of to prevent them. Therefore, the aim of this study was to determine and compare the frequency, severity and trend of complications after periodontal flap surgeries with and without ostectomy and related factors in the periodontics department of Tehran University of Medical Sciences. Materials and Methods: patients in the periodontics department of Tehran University of Medical Sciences, who underwent periodontal flap surgery or gingivectomy, were included in this prospective study. The pain, swelling, and bruising levels were asked on the same day, one and three days later. At the follow-up session on the seventh day, the pain, swelling and bruising levels were asked again, the tenderness and swelling levels were recorded by the surgeon, and flap dehiscence and pus presence were assessed. The difference between the complications’ levels on different days and also the difference in their trends between different surgeries was measured by GEE test, alongside testing the association of background and surgery characteristics with the complications’ levels by MannWhitney and correlation tests. Results: The pain and swelling means on days 0 and 1 respectively were significantly higher than other days. The trend of means for complications were not different between the two groups of flap surgery with and without ostectomy. Tenderness, swelling, flap dehiscence and pus were present in 31%, 31%, 1% and 0% of patients after one week, respectively. Conclusion: Complications after periodontal flap surgeries were uncommon, except for mild pain and swelling. [ABSTRACT FROM AUTHOR]