Abstract
BackgroundEvaluation of the marginal fit of cemented zirconia copings manufactured after digital impression with Lava™ Chairside Oral Scanner in comparison to that of zirconia copings manufactured after conventional impressions with polyvinyl siloxane.MethodsA prepared typodont tooth #36, was replicated 40 times with a vinyl silicone and precise model resin. The dies were randomly divided into two groups according to the impression taking technique. Digital impressions with Lava™ C.O.S. and conventional impressions were taken according to the group. Subsequently zirconia copings were manufactured and cemented on their respective dies with zinc oxide phosphate cement. After embedding in resin, mesio-distal section of each coping was performed with a diamond saw in order to obtain two slices. One half of the specimen was used for evaluation with an optical microscope (OM) and the other half for evaluation with a scanning electron microscope (SEM). Marginal gap (MG) and absolute marginal discrepancy (AMD) were measured mesial and distal on each slice.ResultsNo significant difference of the marginal parameters between the digital and the conventional group was found. The mean values for MG in the digital group were 96.28 μm (+/−43.21 μm) measured with the OM and 99.26 μm (+/−48.73 μm) measured with the SEM, respectively. AMD mean values were 191.54 μm (+/−85.42 μm) measured with the optical microscope and 211.6 μm (+/−96.55 μm) with the SEM. For the conventional group the mean MG values were 94.84 μm (+/−50.77 μm) measured with the OM and 83.37 μm (+/−44.38 μm) measured with the SEM, respectively. AMD mean values were 158.60 μm (+/−69.14 μm) for the OM and 152.72 μm (+/−72.36) for the SEM.ConclusionsCopings manufactured after digital impression with Lava™ C.O.S. show comparable marginal parameters with the copings manufactured after conventional impression with polyvinyl syloxane. The mean MG values of both groups fit in the clinically acceptable range.Electronic supplementary materialThe online version of this article (doi:10.1186/s12903-016-0323-8) contains supplementary material, which is available to authorized users.
Highlights
Evaluation of the marginal fit of cemented zirconia copings manufactured after digital impression with LavaTM Chairside Oral Scanner in comparison to that of zirconia copings manufactured after conventional impressions with polyvinyl siloxane
The mean values for Marginal gap (MG) in the digital group were 96.28 μm measured with the optical microscope and 99.27 μm measured with the scanning electron microscope (SEM), respectively
absolute marginal discrepancy (AMD) mean values were 191.54 μm measured with the optical microscope and 211.6 μm with the SEM
Summary
Evaluation of the marginal fit of cemented zirconia copings manufactured after digital impression with LavaTM Chairside Oral Scanner in comparison to that of zirconia copings manufactured after conventional impressions with polyvinyl siloxane. The impression taking procedure is an essential step in the manufacturing process of dental restorations [1]. It provides a link between the dentist’s and the dental technician’s work for an exact reproduction in the clinical situation. Precision in the impression procedure is a prerequisite for accurate casts and subsequently for the precise fitting of restorations [2]. Various factors like uncontrolled saliva flow during the procedure, undercuts, storing for extended periods of time, moisture, material deformations and incompatibilities with other materials can influence the accuracy of the impression and subsequently lead to inaccuracies and misfit of restorations [6]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
