Aim:This study evaluated and compared two impression techniques in terms of their dimensional accuracies to reproduce implant positions on working casts.Materials and Methods:A master model was designed to simulate a clinical situation. Impressions were made using four techniques: (1) Stock open tray (SOT) technique; (2) stock closed tray (SCT) technique; (3) custom open tray (COT) technique; and (3) custom closed tray (CCT) technique. Reference points on the hexagonal silhouette of the implant on master model and onto the analogs of the obtained master casts were compared after using the four impression techniques. Measurements were made using an optical microscope, capable of recording under 50x magnifications. The means and standard deviations of all the groups and subgroups were calculated and statically analyzed using analysis of variance (ANOVA) and Tukey's test.Results:The open tray impressions showed significantly less variation from the master model and all the techniques studied were comparable.Conclusion:All the techniques studied shown some distortion. COT showed the most accurate results of all the techniques.
Surgical removal of impacted mandibular third molar (SRIMTM) is the most common procedure performed in oral and maxillofacial surgery. In the literature, many complications associated with lower third molar removal are described such as pain, swelling, trismus, infection, inflammation, and nerve damage. Antibiotics are routinely used either pre-operatively or post-operatively to reduce the chances of surgical site infection (SSI). However routine use of antibiotics for SRIMTM is still controversial. For antibiotics to be effective in reducing post-operative infective complications, the time of administration is very important. Adequate serum concentration of antibiotic must be achieved prior to the procedure. In a developing country like India, antibiotics are routinely prescribed post-operatively. The current study is designed to evaluate the efficacy of post-operative prophylactic antibiotic in SRIMTM.
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