RESUMO
STATEMENT OF PROBLEM: High-level evidence that gingival troughing using dental lasers has better outcomes for the management of gingival tissue surrounding prepared teeth compared with conventional gingival displacement methods is lacking. PURPOSE: The purpose of this systematic review was to review in vivo studies on gingival troughing using dental lasers to compare achieved gingival displacement, influence on periodontal health, and other relevant clinical parameters with different existing gingival displacement methods. MATERIAL AND METHODS: The study followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement and identiï¬ed studies through January 2022. An electronic search was conducted on the digital databases PubMed/MEDLINE, Web of Science, Scopus, and Embase to identify relevant studies with no limit on publication year. RESULTS: Nine studies were included in this systematic review. Five studies measured achieved horizontal gingival displacement, where lasers show the highest pooled mean of 0.53 mm, among all other displacement methods. Six of the 9 included studies measured periodontal health parameters, with a follow-up time up to 1 year, and other clinically relevant parameters: hemorrhagic control, time needed, ease of use, tooth mobility, pain, and tooth hypersensitivity. CONCLUSIONS: Gingival displacement and bleeding control appeared to be better achieved using lasers. The time needed to achieve gingival displacement was shortest and easiest with lasers. Lasers resulted in either less or comparable gingival recession, lower impact on tooth hypersensitivity, and less pain during the procedure than other methods.
RESUMO
PURPOSE: The aim of this in vivo study was to evaluate the accuracy of metal-ceramic crowns fabricated using computer-aided design/computer-assisted manufacturing (CAD/CAM) in conjunction with intraoral digital impressions. MATERIALS AND METHODS: Fifty patients in a general practice participated in the study. Patients were provided with crowns fabricated from digital impressions taken with an intraoral chairside scanner. Prior to crown insertion, the marginal integrity, esthetics, and occlusal and articulation contacts were evaluated using California Dental Association (CDA) criteria. The precementation space of the crowns was evaluated with the replica technique. RESULTS: No adjustments were needed for any of the interproximal contact points. Adjustments of occlusion and articulation contacts were needed in 20% of the restorations. Clinical evaluation of the marginal integrity showed satisfactory results according to the CDA criteria. The 50 silicone replicas showed a median precementation space of 46 µm at the marginal measurement location, 94 µm at the midaxial location, and 185 µm at the centro-occlusal location. CONCLUSIONS: The precementation spaces of the crowns were within the acceptable range for CAD/CAM restorations.