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The purpose of this study was to assess the effect of the design and height of the retentive component of a standard titanium implant abutment on the fit, possible horizontal rotation and retention forces of cast nonprecious alloy crowns prior to cementation. Two abutment designs selleck chemical were examined: Type A with a 6�� taper and 8 antirotation planes (Straumann Tissue-Level RN) and Type B with a 7.5�� taper and 1 antirotation plane (SICace implant). Both types were analyzed using 60 crowns: 20 with a full abutment height (6?mm), 20 with a medium abutment height (4?mm), and 20 with a minimal (2.5?mm) abutment height. The marginal and internal fit and the degree of possible rotation were evaluated by using polyvinylsiloxane impressions under a light microscope (magnification of ��50). To measure the retention force, a custom force-measuring device was employed. Statistical analysis: one-sided Wilcoxon rank-sum tests with Bonferroni�CHolm corrections, Fisher��s exact tests, and Spearman's rank correlation coefficient. Type A exhibited increased marginal gaps (primary end-point: 55?��?20?��m vs. 138?��?59?��m, P?Aldosterone Natural Product Library in vivo affect the variables observed. Less-tapered abutments with more antirotation planes provide an increase in the retention force, which confines the horizontal rotation but widens the marginal gaps of the crowns. Thus, casting of nonprecious crowns with Type A abutments may result in clinically unfavorable marginal gaps. ""A. Veis1, I. Barlas2, I. Georgakopoulos3, I. Poutachidis1, S. Barlas4 1School of Dentistry, Aristotle University, Thessaloniki, Greece2Department of Oral Surgery, Implantology and Radiology, School of Dentistry, Aristotle University, Thessaloniki, Greece3Faculty of Engineering ��Enzo Ferrari�� University of Modena & Reggio Emilia, Modena, Italy4Faculty of Dentistry, Ovidius University, Constanta, Romania Background Concentrated growth factor (CGF) is a platelet concentrate, introduced by Sacco in 2006, produced through centrifugation. This autologous biotechnology is designed for the in situ delivery of multiple cellular modulators and the formation of a fibrin scaffold, thereby providing different formulations that can be widely used in numerous medical and scientific fields including oral implantology, orthopaedics, and tissue engineering among others. More than 70% of dentists have experienced patients with postoperative paresthesia or anesthesia usually of the inferior alveolar nerve (IAN), which may be injured during either implant surgery or bone grafting procedures.
