Objectives: To compare between the effect of zirconia and metal CAD/CAM fabricated attachments on alveolar bone height of the residual ridge and periodontal health of abutment teeth in cases with bilateral distal extension base. Materials and Methods: Seven Kennedy class I patients were selected for this study. In a split-mouth manner, one side of the arch received metal attachment together with porcelain fused to metal fixed partial denture, while the other side received zirconia attachment connected to zirconia fixed restoration. Alveolar bone loss, bleeding on probing (BOP) and pocket depths (PD) were measured for each side at the time of delivery and at 6 and 12 months post-insertion. Results: There was no statistically significant difference between the two attachments regarding bone loss in the residual ridge in all follow-up appointments. There was also no significant bone loss for each attachment by the end of the follow-up period. There was no significant difference in BOP and PD at 6 months, but there was a significant increase in BOP and PD for both attachments at 12 months post-insertion. However, the difference between the two attachments was not statistically significant at any follow-up appointment. Conclusions: Zirconia attachment yields comparable clinical and radiographic results as metal attachments for distal extension cases within a follow-up period of one year.
Background:In the recent years, immediate loading of implant is very demanding to shorten the rehabilitation time. Some authors claimed that Melatonin induces bone formation, increase bone density, and bone implant contact. The aim of this study is to assess the eff ect of local melatonin administration on bone density around immediateloaded implant supported over denture. Materials and Methods: Eight completely edentulous patients were selected. The Patient's age ranged between 55 to 65 years old. The study was split-mouth technique, each patient served as his own control, the study group (topical application of melatonin in the implant side), the control group (no melatonin in the other implant side of the same patients).Immediately after the implant placement, implant stability test was performed using the Osstell Monitor, and Digora system was used for assessing the bone density changes. The Radiographic bone density measurements, implant stability assessment, and implant survival were performed at time of loading then at 3, 6 and 12 months after loading. Results: A high statistically signifi cant diff erence in bone density and implant stability in the immediately loaded implants with local melatonin application (P = 0.001). Conclusion:The local melatonin administration increase bone density and improve the osseointegration processes around immediate-loaded implant supported over dentures.
Objectives This in vivo study aims to assess the accuracy of the digital intraoral implant impression technique, the conventional closed-tray impression technique, and open-tray impression techniques in a standardized method of data segmentation along with the best-fit algorithm to overcome the inconsistency of results of previous studies regarding implant impression techniques. Materials and methods Sixteen implants were placed in eight patients. Each patient has undergone four impression techniques: direct intraoral scanning of the stock abutment, intraoral scanning using a scan body, conventional closed tray impression technique, and the conventional open tray impression technique. The conventional impressions were poured into stone casts with analogues and stock abutments and scanned using a desktop scanner. In intraoral scanning of the scan body, computer-aided design software was used for the replacement of the scan body with a custom-made abutment that is identical to the stock abutment, allowing comparison with the other impression techniques. The deviation in implant position between the groups was measured using special 3D inspection and metrology software. Statistical comparisons were carried out between the studied groups using a one-way analysis of variance (ANOVA) test. Results The total deviation between groups was compared to the reference group represented by the intraoral scanning of the abutment. The total deviation was statistically significantly different (P = 0.000) among the different studied groups. The mean deviation was recorded as 21.45 ± 3.3 μm, 40.04 ± 4.1 μm, and 47.79 ± 4.6 μm for the intraoral scanning of the scan body, the conventional closed, and open tray, respectively. Conclusion For implant impressions in partially edentulous patients, intraoral oral scanning using a scan body significantly improves scanning and overall accuracy. Regarding conventional impressions, the closed-tray impression techniques showed more accuracy than conventional open-tray impressions. Clinical relevance Intraoral digital implant impression using scan body offers more accuracy than conventional implant impression techniques for recording posterior implant position in free-end saddle partially edentulous patients.
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