Dean, University of Marmara, Turkey
Keynote: In vivo evaluation of the internal and marginal adaptation and clinical success of different full ceramic crowns generated with CAD/CAM technology
Yasemin Kulak Ozkan has completed her graduate education in Marmara University, Faculty of Dentisty in 1987. She became a Research Assistant in the Faculty of Dentistry Department of Prosthodontics in the same year. She became an Associate profesor in 1996 and became Professor in 2001. She became a Vice Dean in 2004-2007. She was elected president of TPID (Turkish Prostodontics and Implantology Association) at the 2016 and since 2014 she has been running the dean of University of Marmara Faculty of Dentistry and the Head of the department of prosthesis,Istanbul, TURKEY. She has various published more than 60 papers in reputed journals and has been serving as an editorial board member of repute.
The aims of this clinical study were to compare the marginal and internal adaptation of all-ceramic crowns generated with CAD/CAM before cementation and examine the clinical outcomes at baseline and 6th month after luting. Materials and methods: A total of 45 crowns were placed in 38 patients, including 15 lithium disilicate ceramic crowns (LDS, IPS e.max CAD Blocks, Ivoclar, Vivadent, Schaan, Liechtenstein), 30 lithium disilicate stengthened lithium aluminosilicate glass-ceramic crowns (LAS, n!ce® CAD Blocks, Institut Straumann AG, Basel, Switzerland). The marginal and internal gaps of crowns were recorded by using a replica technique. The replica specimens were sectioned bucco-lingually and mesio-distally and the thickness of silicone layers was examined by computerized light microscope at × 40 magnification. Twenty reference points per tooth were measured, and mean marginal and internal gaps were recorded. Restorations were clinically assessed at baseline and 6 months after cementation by using modified USPHS criteria, plaque and gingival indexes and patients satisfaction criteria. Data was analysed by using “Mann-Whitney U” and “Wilcoxon Signed Rank” tests (P<0.05). Results: After 6 month-observation period, total survival rates of LDS and LAS groups were 100%. There were no clinically identified cases of crown fracture or surface chipping. The mean marginal gaps were 53. 2963 (± 11. 2691) μm for LDS group and 51. 6703 (± 11. 2381) μm for LAS group. The highest gap value was observed at the occlusal area and lowest one at the marginal area (P<0,05). There was no significant difference in relation to material difference. Conclusions: Regarding all of the clinical evaluation criteria all 45 crowns exhibited clinically acceptable scores within an average evaluation time of 6 months. Early results indicate that LAS crowns may be an effective option for all-ceramic restorations.