Joana Schönberger1, Kurt-Jürgen Erdelt1, Daniel Bäumer2, Florian Beuer3,4. 1. Department of Prosthodontics, Munich Dental School, Goethestr. 70, 80336, Munich, Germany. 2. Hürzeler/Zuhr Private Practice, Rosenkavalierplatz 18, 81925, Munich, Germany. 3. Department of Prosthodontics, Munich Dental School, Goethestr. 70, 80336, Munich, Germany. florian.beuer@charite.de. 4. Department of Prosthodontics, Charité UniversityMedicine Berlin, Assmannshauserstrasse 4-6, 14197, Berlin, Germany. florian.beuer@charite.de.
Abstract
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.
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.
Authors: Bogna Stawarczyk; Mutlu Ozcan; Lubica Hallmann; Andreas Ender; Albert Mehl; Christoph H F Hämmerlet Journal: Clin Oral Investig Date: 2012-02-23 Impact factor: 3.573
Authors: Fabio Kricheldorf; Cleuber Rodrigo de Souza Bueno; Wilson da Silva Amaral; Joel Ferreira Santiago Junior; Hugo Nary Filho Journal: Eur J Dent Date: 2018 Jan-Mar