Abstract
The goal of this study was to determine the level of various discrepancies in all-ceramic IPS e. max � lithium disilicated crowns milled with three different milling machines. A 3D printed Geller model with a preparation for all ceramic crown was scanned, then the digital design was created and 24 lithium disilicate crowns were milled using three different milling machines: Plan mill 40S (Planmeca, Helsinki, Finland), Cerec MC XL (Sirona GmbH, Germany), and one laboratory milling machine Imes-Icore 650i (Coritec, Eiterfeld, Germany). Among the three groups, the highest marginal fit accuracy was displayed by crowns fabricated by laboratory milling machine Imes-Icore 650i, followed by chairside Plan mill 40S and Cerec MC XL. The results of our study shows that llithium disilicate crowns fabricated by a laboratory milling and 2 chair-side milling machines present marginal accuracy in the acceptable clinical range.
Highlights
Increasing patient’s and clinicians demand for esthetics in the last decade, has led to the development of new technologies and ceramic materials
The purpose of this study is to compare the marginal fit of lithium disilicate crowns milled with two chairside Planmill 40S (Planmeca, Helsinki, Finland), Cerec MC XL (Sirona GmbH, Germany), and one laboratory milling machine Imes-Icore 650i (Coritec, Eiterfeld, Germany)
The results showed that the best marginal fit was presented in the “3Shape D2000 group” (62.9±12.2μm), followed by “Planmeca “(82.8±25.9 μm) and “CEREC “(128.8±40.3 μm) groups’. (Figure 8)
Summary
Increasing patient’s and clinicians demand for esthetics in the last decade, has led to the development of new technologies and ceramic materials. CAD/CAM systems evolved constantly and create the possibility to fabricate prosthetic restorations with an enhanced accuracy of marginal fit [1]. Chairside CAD/CAM systems, can diminish the working time for both the dentist and the patient by decreasing the need for the dental laboratory phase and creating the possibility of same day restorations. Marginal fit can be defined as the space between the boundary of the prepared tooth and the edge of the prosthetic work. This prevents the development of secondary caries, accumulation of bacterial plaque, infiltration of bacteria and toxin [2]. Of paramount importance is the tooth preparation type because, in default of a proper preparation and a ferrule effect, we can’t have an optimal marginal adaptation
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