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Effect of In-office Bleaching on Color, Translucency, and Whiteness Variations in CAD-CAM Monolithic Materials
Operative Dentistry
|October 8, 2021
Summary
In-office bleaching improved the optical properties of stained CAD-CAM monolithic materials like Lava Ultimate and Vita Enamic. This treatment enhanced translucency and whiteness without increasing staining susceptibility.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Restorative Dentistry
Background:
- Computer-aided design and computer-aided manufactured (CAD-CAM) monolithic materials are widely used in restorative dentistry.
- The impact of bleaching on the optical properties of these materials remains largely unknown.
- Understanding these effects is crucial for maintaining aesthetic outcomes.
Purpose of the Study:
- To evaluate the effect of one session of in-office bleaching on stain removal, staining susceptibility, translucency, and whiteness of CAD-CAM monolithic materials.
- To compare the responses of different CAD-CAM materials to bleaching and staining.
- To determine the clinical significance of observed optical property changes.
Main Methods:
- Four CAD-CAM monolithic materials (Lava Ultimate, Vita Enamic, Vita Suprinity, IPS e.max CAD) were fabricated into disks.
- Spectrophotometry was used to measure Commission Internationale de l'Eclairage L*a*b* coordinates.
- Specimens underwent staining (coffee) and/or bleaching (40% hydrogen peroxide) protocols to assess stain removal and susceptibility, with color difference (ΔE00), translucency (ΔTP00), and whiteness (ΔWID) analyzed.
Main Results:
- Coffee staining increased color difference and decreased translucency and whiteness in Lava Ultimate, Vita Enamic, and Vita Suprinity. IPS e.max CAD's whiteness was affected.
- Bleaching after coffee immersion reduced color difference and improved translucency and whiteness in Lava Ultimate and Vita Enamic, with similar benefits for Vita Suprinity.
- Bleaching before coffee immersion had minimal effects, with some materials showing slight translucency changes within acceptable clinical limits.
Conclusions:
- One session of in-office bleaching positively impacted the optical properties of stained Lava Ultimate, Vita Enamic, and Vita Suprinity.
- Bleaching did not increase the susceptibility to staining or cause clinically unacceptable changes in translucency or whiteness for these materials.
- IPS e.max CAD showed minimal optical changes, all below perceptible thresholds, indicating high stability.
