Effects of Simulated Gastric Juice on CAD/CAM Resin Composites—Morphological and Mechanical Evaluations

Purpose To evaluate the effects of simulated gastric juice on CAD/CAM resin composites by means of morphological and mechanical (i.e., hardness) evaluations. Materials and Methods Fourteen specimens of each resin composite (Lava Ultimate and Paradigm MZ100) were prepared according to the manufacture...

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Bibliographic Details
Published in:Journal of prosthodontics 2017-07, Vol.26 (5), p.424-431
Main Authors: Backer, Adriana D., Münchow, Eliseu A., Eckert, George J., Hara, Anderson T., Platt, Jeffrey A., Bottino, Marco C.
Format: Article
Language:English
Subjects:
Acid degradation
Bulimia
CAD/CAM
Composite Resins
Computer-Aided Design
Dental Prosthesis
Dental Prosthesis Design
Dental restorative materials
Dentistry
Electron microscopy
Gastric juice
Gastric Juice - metabolism
Hardness
Microscopy, Electron, Scanning
Morphology
pH effects
Resin composites
Resins, Synthetic
Roughness
Scanning electron microscopy
Statistical analysis
Surface Properties
Surface roughness
Zirconium
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Summary:Purpose To evaluate the effects of simulated gastric juice on CAD/CAM resin composites by means of morphological and mechanical (i.e., hardness) evaluations. Materials and Methods Fourteen specimens of each resin composite (Lava Ultimate and Paradigm MZ100) were prepared according to the manufacturer's instructions. They were submitted to erosive challenges in a simulated gastric juice (pH = 1.2) solution for 6 and 24 hours. Vickers microhardness and surface roughness (Ra, Rq) evaluations were taken before (baseline) and after acid exposure. Morphological analysis was obtained using scanning electron microscopy (SEM). Statistical analysis was performed using two‐way repeated measures ANOVA and Student‐Newman‐Keuls's test (α = 0.05). Results Paradigm MZ100 demonstrated higher microhardness than Lava Ultimate regardless of the storage time period (p ≤ 0.001), and microhardness was not affected by the acidic challenge (p = 0.58). After 6 hours of acid exposure, a significant decrease in Ra and Rq was seen for Paradigm MZ100 when compared to the baseline (Ra p = 0.032; Rq p = 0.013); however, for Lava Ultimate only Rq decreased (p = 0.021), while Ra remained unchanged (p = 0.38). After 24 hours of acid exposure, while Paradigm MZ100 exhibited no additional changes in surface roughness (p ≥ 0.75), Lava Ultimate became rougher (Ra p = 0.041; Rq p = 0.014), as confirmed by SEM imaging. Conclusions The acidic scenario tested in the present study changed the surface roughness of the resin composites but not their Vickers microhardness. Moreover, both resin composites seem suitable for use under acidic scenarios, although Paradigm MZ100 showed enhanced stability compared to Lava Ultimate.
ISSN:1059-941X
1532-849X
DOI:10.1111/jopr.12420