Comparación del ajuste en coronas de zirconio elaboradas con técnicas de impresión digital o convencional. Revisión sistemática.

Abstract

Introduction: The quality and accuracy of a marginal adaptation on a fix crown is an important feature to consider for its success and duration, which, at the same time is subjected to the chosen impression technique; the conditions where the impression is stored; periodontal health and selection of the tray. Objective: Determine the marginal adaptation in zirconia crowns through two different impression methods, conventional and digital. Materials and methods: This study follows a post hoc, cross-sectional method which assesses the marginal adjustment of zirconia crowns using conventional and digital methods before impression taking. The information gathered for this study was collected from metasearch engines such as Pubmed and Medline. Twenty-two out of thirty-one articles published between 2010 and 2021 were selected. Results: Factors which affect the marginal adjustment of zirconia crown, 22 articles (45%) suggested the presence of cavities, 21 articles (43%) reported periodontal disease; 6 articles (12%) reported endodontic lesions. As for the benefits of digital impressions in contrast with the conventional approach, 9 articles (18.40%) reported patient and dentist satisfaction, 8 articles (16.30%) reported reduced time burden, 8 articles (16.30%) reported improved information storage capacity, 9 articles (18.40%) reported improved communication with the dental laboratory,8 articles (18.40%) reducing distortion of materials, 7 articles (14.30%) reported streamlined steps when taking impressions. The preparation lines that produced the best results in the adjustment were analyzed, 9 articles (75%) chamfer, 2 (17%) shoulder, 1 (8%) feather edge. Conclusions: The zirconia crowns fabricated after digital or conventional impressions presented a marginal adjustment with similar results, however, the digital impression technique offers several advantages over the conventional technique.