Marginal and Internal Fit of Conventional Metal-Ceramic and Lithium Disilicate CAD/CAM Crowns.
This study aimed to evaluate and compare the marginal and internal gap widths of lithium disilicate computer-aided design / computer-assisted manufacture (LDC) crowns and conventionally produced porcelain-fused-to-metal (PFM) crowns. A convenience sample of 21 patients treated with a single restoration was selected. PFM and LDC crowns were fabricated for each selected abutment tooth, following traditional crown preparation. Silicone replicas were produced, and internal gaps and marginal gaps were measured. Internal gaps were significantly larger for the axial and occlusal surfaces of LDC crowns than for those of PFM crowns (P < .001). Marginal gaps were not significantly different (P > .05). Both LDC crowns and PFM crowns showed clinically acceptable marginal fit.
Se-Jin
SJ
Nam
Mi-Jung
MJ
Yoon
Won-Hee
WH
Kim
Gil-Ju
GJ
Ryu
Min-Ki
MK
Bang
Jung-Bo
JB
Huh
D000328:Adult; D017076:Computer-Aided Design; D003442:Crowns; D000044:Dental Abutments; D018772:Dental Marginal Adaptation; D003776:Dental Porcelain / Q000737:chemistry*; D017267:Dental Prosthesis Design; D005260:Female; D006801:Humans; D008297:Male; D016876:Metal Ceramic Alloys / Q000737:chemistry*; D016628:Replica Techniques; D013499:Surface Properties; D019231:Tooth Preparation, Prosthodontic / Q000379:methods
D016876:Metal Ceramic Alloys; C493120:lithia disilicate; D003776:Dental Porcelain