Journal Article

Marginal and internal fit of posterior three-unit fixed zirconia dental prostheses fabricated with two different CAD/CAM systems and materials

Bäumer, Daniel, Beuer, Florian, Erdelt, Kurt-Jürgen, Schönberger, Joana

2017

Overview

Objectives The purpose of this in vitro study was to compare the precision of fit of frameworks milled from semi-sintered regular zirconia and high-translucent (HT) zirconia blanks, fabricated with two different CAD/CAM systems. Material and methods Three-unit, posterior fixed dental prostheses (FDP) frameworks were fabricated for standardized dies ( n  = 11) with two different laboratory computer-aided design (CAD)/computer-aided manufacturing (CAM) systems (Cercon/Ceramill). The replica technique was used to evaluate the marginal and internal fit under an optical microscope. Evaluation of the data was performed according to prior studies at a level of significance of 5%. Results The systems showed a statistically significant influence on the internal fit of the frameworks ( p  ≤ 0.001) and on the marginal fit ( p  < 0.001). The type of material showed no influence on the marginal fit for the Cercon system ( p  = 0.636) and on the marginal fit ( p  = 0.064) and the internal fit ( p  = 0.316) for the Ceramill system, while regular zirconia from Cercon showed higher internal values than HT zirconia ( p  = 0.016). Conclusions and clinical relevance Both investigated systems showed clinically acceptable values within the limitations of this in vitro study. However, one showed less internal accuracy when regular zirconia was used.

• Publisher: Springer Berlin Heidelberg,Springer Nature B.V
• Subject: Computer-Aided Design / Dental Marginal Adaptation / Dental Materials - chemistry / Dental Models / Dental prosthetics / Dentistry / Denture Design - methods / Denture, Partial, Fixed / In Vitro Techniques / Materials Testing / Medicine / Original Article / Prostheses / Statistical analysis / Zirconia / Zirconium - chemistry