Influence of preparation design on fit and ceramic thickness of CEREC 3 partial ceramic crowns after cementation. (April 2014)

• Record Type: Journal Article
• Authors: Kim, Jae-Hoon; Cho, Byeong-Hoon; Lee, Jin-Hee; Kwon, Soo-Jung; Yi, Young-Ah; Shin, Yooseok; Roh, Byoung-Duck; Seo, Deog-Gyu
• Is Part Of: Acta odontologica Scandinavica. Volume 73:Number 2(2015)
• Page Start: 107
• Page End: 113
• Publication Date: 2014-04
• Subjects: Dentistry -- Periodicals; 617.6005
• DOI: 10.3109/00016357.2014.956145
• Languages: English
• ISSNs: 0001-6357

Abstract

<abstract> <title>Abstract</title> <p> <bold> <italic>Objective.</italic> </bold> This study investigated the influence of preparation design on the marginal and internal gap and ceramic thickness of partial ceramic crowns (PCCs) fabricated with the CEREC 3 system. <bold><italic>Materials and methods.</italic></bold> Sixteen extracted human mandibular molars were prepared according to two different preparation designs (<italic>n</italic> = 8): a retentive preparation design with traditional cusp capping (Group I) and a non-retentive preparation design with horizontal reduction of cusps (Group II). PCCs were fabricated from IPS Empress CAD with the CEREC 3 system. The parameters for luting space and minimum occlusal ceramic thickness were set to 30 μm and 1.5 mm, respectively. The fabricated PCCs were cemented to their corresponding teeth with self-adhesive resin cement and were then scanned by micro-computed tomography. The marginal and internal gaps were measured at pre-determined measuring points in five bucco-lingual and three mesio-distal cross-sectional images. The ceramic thicknesses of the PCCs were measured at the measuring points for cusp capping areas. <bold><italic>Results.</italic></bold> Group II (167.4 ± 76.4 μm) had a smaller overall mean gap, which included the marginal and internal gap measurements, than that of Group I (184.8 ± 89.0 μm). The internal gaps were larger than the marginal gaps, regardless of preparation design. Group I presented a thinner ceramic thickness in the cusp capping areas than the minimum occlusal ceramic thickness parameter of 1.5 mm. <bold><italic>Conclusion.</italic></bold> Preparation design had an influence on fit, particularly the internal gap of the PCCs. Ceramic thickness could be thinner than the minimum ceramic thickness parameter.</p> </abstract>