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| Evaluation of Marginal Gap and Internal Adaptation of All-Ceramic Coping Fabricated With CAD/CAM and Press-Laboratory Technique; an In Vitro Study |
Ayman M. Musleh, , Bassel S. AbuNasser, Ahmad J. Faraj, Ahmed Awwad, Yousef J. Hamad, Fatema Al Hour, Amjad Elshanti
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Abstract:
This study aims to evaluate marginal gap and internal adaptation of zircon reinforced lithium disilicate copping fabricated by conventional press-laboratory and CAD/CAM systems. Methods: Tooth #14 was prepared per standard specification to receive the zircon reinforced lithium disilicate copping. For press-laboratory technique fifty type IV gypsum dies tooth #14 were duplicated and divided into two groups (n=25). CAD/CAM technique (Group A) copping was fabricated with the CEREC CAD/CAM system according to manufacturer's instructions. Within press-laboratory made copping, impressions were taken on the region area with one-step impression techniques with light and putty consistency Polyvinyl siloxane. Impressions were sent to two independent dental laboratories (Groups B and C) for fabricating the press copping. Tooth #14 was optically scanned and zircon reinforced lithium disilicate blocks were used to fabricate copping using CAD/CAM technique. The marginal and internal gap of the copping was assessed by the silicone replica technique which use optical microscope at 160× magnification to comparison between results of replica. Eight sections of each replica were obtained, four section were used to measured internal gap and each section was evaluate at four points: cervico-axial (CA), mid axial wall (AW), axio-occlusal edge (AO) and Centro-occlusal wall (CO), and other four section used to measured marginal gap and each section was evaluate at one points: middle buccal, middle palatal, middle mesial and middle distal using an image analyzing software. Statistical analysis was performed using t-test. Result: there was a significantly differences in marginal (t=11.17, P-value=0.000), and internal gap cervically (t=2.79, P-value=0.007), middle (t=3.42, P-value=0.001) and occlusally (t=3.42, P-value=0.001) of press-laboratory technique and the CAD/CAM technique.
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