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Scientific article
Open access
English

Influence of polishing technique and coffee thermal cycling on the surface roughness and color stability of additively and subtractively manufactured resins used for definitive restorations

Publication date2023-07-08
First online date2023-07-08
Abstract

Purpose: To evaluate how different polishing techniques and coffee thermal cycling affect the surface roughness and stainability of additively and subtractively manufactured resins used for definitive prostheses.

Materials and methods: Two additively manufactured composite resins (Crowntec, CT and VarseoSmile Crown Plus, VS) and a subtractively manufactured resin nanoceramic (Cerasmart, CS) were used to fabricate 90 rectangular-shaped specimens (14 × 12 × 1 mm) (n = 30). After baseline surface roughness (Ra) measurements, specimens were divided into three groups based on the polishing technique; conventional polishing with a 2-stage polishing kit (CP) and surface sealant application (Optiglaze, OG or Vita Akzent LC, VA) (n = 10). After polishing, specimens were subjected to 10,000 cycles of coffee thermal cycling. Raand color coordinate measurements were performed after polishing and after coffee thermal cycling. Color difference (ΔE00) was calculated. Scanning electron microscope images were taken at each time interval. Kruskal-Wallis or 1-way analysis of variance (ANOVA) were used to evaluate Raof materials within each polishing-time interval pair and different polishing techniques within each material-time interval pair, while Friedman or repeated measures ANOVA were used to evaluate Raat different time intervals within each material-polishing pair. ΔE00was assessed with 2-way ANOVA (α = 0.05).

Results: Other than VA-after polishing (p = 0.055), tested materials had significantly different Rawithin each polishing-time interval pair (p ≤ 0.038). When Radifferences among different polishing techniques within each material-time interval pair were considered, CS had differences after coffee thermal cycling, CT had differences before polishing and after coffee thermal cycling, and VS had differences within each time interval (p ≤ 0.038). When Radifferences among different time intervals within each material-polishing pair were considered, significant differences were observed among all pairs (p ≤ 0.016), except for CS-VA (p = 0.695) and VS-VA (p = 0.300). ΔE00values were affected by material and polishing technique interaction (p = 0.007).

Conclusions: Raof CS was similar to or lower than the Raof other materials, regardless of the time interval or polishing technique. CP mostly led to lower Rathan other polishing techniques, whereas VA resulted in a high Raregardless of the material-time interval pair. Polishing reduced the Ra, while coffee thermal cycling was found to have a small effect. Among tested material-polishing pairs, only CS-VA had moderately unacceptable color change when previously reported threshold values were considered.

eng
Keywords
  • Additive manufacturing
  • Coffee thermal cycling
  • Polishing
  • Stainability
  • Surface roughness
Citation (ISO format)
ÇAKMAK, Gülce et al. Influence of polishing technique and coffee thermal cycling on the surface roughness and color stability of additively and subtractively manufactured resins used for definitive restorations. In: Journal of prosthodontics, 2023. doi: 10.1111/jopr.13730
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Article (Accepted version)
Identifiers
ISSN of the journal1059-941X
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