TY - JOUR
T1 - Comparative Analysis of CAD-CAM Workflow Variations on the Marginal and Internal Gaps and Fatigue Behavior of Ceramic and Resin Composite Dental Crowns
AU - Pilecco, Rafaela Oliveira
AU - Rosa, Lucas Saldanha da
AU - Baldi, Andrea
AU - Machry, Renan Vaz
AU - Tribst, João Paulo Mendes
AU - Valandro, Luiz Felipe
AU - Kleverlaan, Cornelis Johannes
AU - Scotti, Nicola
AU - Pereira, Gabriel Kalil Rocha
N1 - The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/).
PY - 2025/3/12
Y1 - 2025/3/12
N2 - OBJECTIVES: To analyze the marginal/internal gap and the fatigue behavior of crowns made of two different materials, using four combinations of a digital workflow-two intraoral scanners (IOSs) and two milling machines.MATERIALS AND METHODS: Crowns were made considering three factors: IOS (a confocal microscopy-based scanner: TRIOS 3-TR; or a combination of active triangulation and dynamic confocal microscopy: Primescan-PS), milling machines (four-axis: CEREC MC XL-CR or five-axis: PrograMill PM7-PM), and restorative material (lithium disilicate-LD or resin composite-RC) (
n = 10). The bonding surface of each crown was treated and bonded to each respective glass fiber-reinforced epoxy resin die using a dual-cure resin cement. A computed microtomography analysis was performed to access marginal/internal gap. The specimens were subjected to a cyclic fatigue test (20 Hz, initial load = 100 N/5,000 cycles; step size= 50 N/10,000 cycles until 1,500 N, then if specimens survived, the step size was increased to 100 N/10,000 cycles).
STATISTICAL ANALYSIS: For data analysis, three-way analysis of variance and Kaplan-Meier with log-rank (Mantel-Cox) test were performed (α = 0.05).RESULTS: TR resulted in a smaller axial-occlusal angle and occlusal gap, and five-axis milling resulted in a smaller marginal gap, axial-occlusal angle, and occlusal gap. Angled points and occlusal surface showed a tendency for overmilling. RC crowns displayed higher survival rates and a more pronounced topography compared with LD independently of the scanning and milling method. LD crowns produced with a five-axis milling machine resulted in higher fatigue performance and rougher topography compared with a four-axis machine.CONCLUSION: RC crowns displayed better fatigue behavior compared with LD, while LD benefited from a five-axis machine for improved survival probability.
AB - OBJECTIVES: To analyze the marginal/internal gap and the fatigue behavior of crowns made of two different materials, using four combinations of a digital workflow-two intraoral scanners (IOSs) and two milling machines.MATERIALS AND METHODS: Crowns were made considering three factors: IOS (a confocal microscopy-based scanner: TRIOS 3-TR; or a combination of active triangulation and dynamic confocal microscopy: Primescan-PS), milling machines (four-axis: CEREC MC XL-CR or five-axis: PrograMill PM7-PM), and restorative material (lithium disilicate-LD or resin composite-RC) (
n = 10). The bonding surface of each crown was treated and bonded to each respective glass fiber-reinforced epoxy resin die using a dual-cure resin cement. A computed microtomography analysis was performed to access marginal/internal gap. The specimens were subjected to a cyclic fatigue test (20 Hz, initial load = 100 N/5,000 cycles; step size= 50 N/10,000 cycles until 1,500 N, then if specimens survived, the step size was increased to 100 N/10,000 cycles).
STATISTICAL ANALYSIS: For data analysis, three-way analysis of variance and Kaplan-Meier with log-rank (Mantel-Cox) test were performed (α = 0.05).RESULTS: TR resulted in a smaller axial-occlusal angle and occlusal gap, and five-axis milling resulted in a smaller marginal gap, axial-occlusal angle, and occlusal gap. Angled points and occlusal surface showed a tendency for overmilling. RC crowns displayed higher survival rates and a more pronounced topography compared with LD independently of the scanning and milling method. LD crowns produced with a five-axis milling machine resulted in higher fatigue performance and rougher topography compared with a four-axis machine.CONCLUSION: RC crowns displayed better fatigue behavior compared with LD, while LD benefited from a five-axis machine for improved survival probability.
U2 - 10.1055/s-0044-1791705
DO - 10.1055/s-0044-1791705
M3 - Article
C2 - 40073994
SN - 1305-7456
JO - European Journal of Dentistry
JF - European Journal of Dentistry
ER -