Do surface treatments affect the optical properties of ceramic veneers?

Optical properties of dental ceramics are critical for aesthetic outcomes. Prior research has shown that ceramic thickness and surface preparation influence color perception. However, the specific effects of different surface treatments on ceramic veneers remain unclear. No prior work had resolved how treatments like etching or laser irradiation interact with ceramic type and thickness. This gap motivated the current study to explore how these variables collectively affect optical changes. Existing methods often focus on cementation alone, not pre-cementation treatments. This paper contributes by systematically testing various treatments across multiple ceramic types. The study aims to clarify whether these interventions alter color parameters in measurable ways. Understanding these interactions could improve clinical protocols for veneer placement.

The study aimed to determine if surface treatments influence the optical properties of ceramic veneers before cementation. Researchers focused on five ceramic systems and two thicknesses to evaluate color changes. The motivation was to address inconsistencies in how treatments like etching or laser irradiation affect aesthetics. By comparing multiple treatment groups, the study sought to identify which interventions cause the most noticeable color shifts. This could help clinicians choose optimal preparation methods. The study also aimed to assess whether ceramic type and thickness moderate treatment effects. The goal was to provide evidence-based guidance for surface preparation in veneer placement. The findings could inform best practices for achieving desired optical outcomes.

Researchers prepared 280 disk-shaped ceramic veneers from five different systems. The ceramics were cut to 0.5-mm and 1.0-mm thicknesses. Four surface treatment groups were tested: no treatment, hydrofluoric acid etching, airborne-particle abrasion with 30-μm Al2O3, and erbium:yttrium-aluminum-garnet laser irradiation. A translucent resin shade was selected for cementation. Color parameters were measured using a colorimeter. Statistical analysis involved 3-way ANOVA and the Bonferroni test with a significance threshold of P=0.5. The study controlled for ceramic type, treatment method, and thickness. Results were compared across all combinations of these variables.

The greatest color change occurred after airborne-particle abrasion with 0.5-mm-thick e.max Press ceramics (ΔE=2.9). Significant interactions were found between surface treatment, ceramic type, and thickness for ΔE values (P=0.01). No significant interactions were observed for L*, a*, or b* values. Differences in ΔE were noted among treatment groups for 0.5-mm-thick ceramics, except IPS Inline. For 1.0-mm-thick ceramics, differences were observed except for Empress Esthetic. Thinner ceramics showed greater color changes after treatments. Hydrofluoric acid, airborne abrasion, and laser treatments all affected ΔE values. The study found that treatment effects varied by ceramic type and thickness.

The authors propose that surface treatments influence the optical properties of ceramic veneers. Color changes increased after treatments, especially in thinner ceramics. The most noticeable changes occurred with airborne-particle abrasion of e.max Press. The study suggests that ceramic type and thickness moderate treatment effects. No significant changes were observed in L*, a*, or b* values. The findings imply that clinicians should consider treatment and ceramic type when preparing veneers. The results do not suggest that any treatment is essential for optical stability. The authors emphasize the need for careful selection of preparation methods based on ceramic properties.