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Color stability of shade guides after autoclave sterilization
Summary
Autoclave sterilization significantly altered shade guide colors, making them darker. While Vita Classical guides turned redder and Vita System 3D-Master guides yellower, these color changes are clinically acceptable.
Area of Science:
- Dental Materials Science
- Color Science in Dentistry
Background:
- Shade guides are crucial for accurate dental color matching.
- Autoclave sterilization is a common method for dental instrument disinfection.
- The long-term color stability of shade guides after repeated sterilization is not fully understood.
Purpose of the Study:
- To evaluate the effect of 120 autoclave sterilization cycles on the color stability of Vita Classical and Vita System 3D-Master shade guides.
- To determine if color changes are statistically significant and clinically relevant.
Main Methods:
- Two commercial shade guides (Vita Classical, Vita System 3D-Master) were subjected to 120 autoclave sterilization cycles.
- Color measurements were taken using spectrophotometry before and after sterilization.
- Color changes were analyzed using the three-dimensional CIELab system and paired samples t-test.
Main Results:
- All shade guide specimens exhibited darkening after autoclave sterilization.
- Vita Classical specimens showed a trend towards redness (increased 'a*' values).
- Vita System 3D-Master specimens showed a trend towards yellowness (increased 'b*' values).
- Statistically significant changes in color coordinates were observed for both shade guides.
Conclusions:
- Repeated autoclave sterilization cycles induce significant color alterations in Vita Classical and Vita System 3D-Master shade guides.
- Despite statistically significant changes, the observed color differences are considered clinically acceptable for dental shade matching.
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