scholarly journals Fracture resistance of computer-aided design/computer-aided manufacturing-generated composite resin-based molar crowns

2015 ◽  
Vol 123 (2) ◽  
pp. 122-129 ◽  
Author(s):  
Akio Harada ◽  
Keisuke Nakamura ◽  
Taro Kanno ◽  
Ryoichi Inagaki ◽  
Ulf Örtengren ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Fracture Resistance ◽  
Composite Resin ◽  
Computer Aided Manufacturing ◽  
Computer Aided ◽  
Aided Design

Radiopacity of computer‐aided design/computer‐aided manufacturing composite resin blocks

2020 ◽  
Vol 128 (3) ◽  
pp. 241-245
Author(s):  
Hiroyasu Koizumi ◽  
Kentaro Okamura ◽  
Haruto Hiraba ◽  
Akihisa Kodaira ◽  
Takayuki Yoneyama ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Composite Resin ◽  
Computer Aided Manufacturing ◽  
Computer Aided ◽  
Aided Design

Leaching behaviors of computer-aided design/computer-aided manufacturing composite resin component elements immersed in water

2019 ◽  
Vol 63 (2) ◽  
pp. 221-226 ◽  
Author(s):  
Junji Iwata ◽  
Masaki Asakura ◽  
Tatsuhide Hayashi ◽  
Shozo Tsuruta ◽  
Miki Hori ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Composite Resin ◽  
Computer Aided Manufacturing ◽  
Computer Aided ◽  
Aided Design

Influence of Computer-aided Design/Computer-aided Manufacturing Diamond Bur Wear on Marginal Misfit of Two Lithium Disilicate Ceramic Systems

2019 ◽  
Vol 45 (4) ◽  
pp. 416-425
Author(s):  
LH Raposo ◽  
PS Borella ◽  
DC Ferraz ◽  
LM Pereira ◽  
MS Prudente ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Composite Resin ◽  
Lithium Disilicate ◽  
Computer Aided Manufacturing ◽  
Diamond Bur ◽  
Significant Difference ◽  
Computer Aided ◽  
Cad Cam ◽  
Ceramic Crowns ◽  
Aided Design

Clinical Relevance Marginal misfit of monolithic lithium disilicate ceramic crowns obtained from a chairside computer-aided design/computer-aided manufacturing system is affected after successive millings using a single diamond bur set. This fact can be critical for the longevity of indirect restorations. SUMMARY Objectives: This laboratory study aimed to assess the effect of successive crown millings on the marginal misfit of monolithic full-ceramic restorations obtained from two lithium disilicate systems, with a single diamond bur set used for each material in a chairside computer-aided design/computer-aided manufacturing (CAD/CAM) unit. Methods and Materials: Initially, 36 standardized composite resin dies were produced by additive manufacturing from a three-dimensional model of a right mandibular first molar with full-crown preparation generated in CAD software. Individual ceramic crowns were obtained in a chairside CAD/CAM unit (CEREC MC XL) for each composite resin die according to the ceramic system (IPS e.max CAD and Rosetta SM; n=18). Two new diamond burs were used as a set for obtaining the crowns in each experimental group (ceramic systems), and the milling periods were defined after three crown millings (T0-T6), when the diamond bur set of each system was removed for morphologic characterization using scanning electron microscopy (SEM). The marginal misfit of the crowns was assessed through coronal and sagittal micro-tomographic sectioning, in the vertical and horizontal directions of the ceramic crowns seated on their respective resin dies. The collected data were tabulated and subjected to one-way analysis of variance and Tukey's honestly significant difference test (α=0.05). Results: SEM images showed changes in the superficial morphology of the diamond bur sets, with progressive loss of the diamond granules after the successive millings of crowns for both experimental groups. Significant differences were detected in the marginal misfit of the crowns from both ceramic systems at the different milling periods (p<0.001). Conclusions: Diamond burs deteriorated after successive crown millings for both lithium disilicate ceramic systems. The marginal misfit of the crowns obtained increased with the successive use of the CAD/CAM diamond bur set employed for milling each ceramic material. In addition, new milling of full lithium disilicate ceramic crowns can be inappropriate after 11 successive millings for IPS e.max CAD and 12 for Rosetta SM, due to the increased marginal misfit observed under the parameters tested.

Effect of Different Computer-aided Design/Computer-aided Manufacturing (CAD/CAM) Materials and Thicknesses on the Fracture Resistance of Occlusal Veneers

2018 ◽  
Vol 43 (5) ◽  
pp. 539-548 ◽  
Author(s):  
JP Andrade ◽  
D Stona ◽  
HR Bittencourt ◽  
GA Borges ◽  
LH Burnett ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Fracture Resistance ◽  
Testing Machine ◽  
Control Group ◽  
Computer Aided Manufacturing ◽  
Universal Testing ◽  
Computer Aided ◽  
Cad Cam ◽  
Aided Design

SUMMARY The aim was to evaluate, in vitro, the influence of different computer-aided design/computer-aided manufacturing (CAD/CAM) materials (IPS e.max CAD, Vita Enamic, and Lava Ultimate) and thicknesses (0.6 mm and 1.5 mm) on the fracture resistance of occlusal veneers. Sixty human third molars were prepared to simulate advanced erosion of the occlusal surface, and the teeth were randomly divided into six experimental groups (n=10) according to the material and thickness used to build the veneers. Ten sound teeth formed the control group. The veneers were adhesively luted and submitted to mechanical cyclic loading (1 million cycles at 200-N load). The fracture resistance test was performed in a universal testing machine. The failures were classified as “reparable” and “irreparable.” According to two-way analysis of variance and the Tukey test, the interaction (material × thickness) was significant (p=0.013). The highest fracture resistance was obtained for IPS e.max CAD at a 1.5-mm thickness (4995 N) and was significantly higher compared to the other experimental groups (p<0.05). The lowest fracture resistance was obtained for Vita Enamic at 0.6 mm (2973 N), although this resistance was not significantly different from those for IPS e.max CAD at 0.6 mm (3067 N), Lava Ultimate at 0.6 mm (3384 N), Vita Enamic at 1.5 mm (3540 N), and Lava Ultimate at 1.5 mm (3584 N) (p>0.05). The experimental groups did not differ significantly from the sound teeth (3991 N) (p>0.05). The failures were predominantly repairable. The occlusal veneers of IPS e.max CAD, Vita Enamic, and Lava Ultimate, with thicknesses of 0.6 mm and 1.5 mm, obtained fracture resistances similar to those associated with sound teeth.

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