en
Scientific article
Open access
English

Effect of coffee thermocycling on the surface roughness and stainability of denture base materials with different chemical compositions manufactured with additive and subtractive technologies

Publication date2023-09-14
First online date2023-09-14
Abstract

Objective: To evaluate the effect of coffee thermocycling (CTC) on the surface roughness (Ra) and stainability of denture base materials with different chemical compositions fabricated by using additive and subtractive manufacturing.

Materials and methods: Disk-shaped specimens were additively (FREEPRINT denture, AM) or subtractively (G-CAM, GSM and M-PM, SM) fabricated from three pink denture base materials in different chemical compositions (n = 10). Rawas measured before and after polishing, while color coordinates were measured after polishing. Specimens were subjected to CTC (5000 cycles) and measurements were repeated. Color differences (ΔE00) after CTC were calculated. Raamong different time intervals within materials was evaluated by using repeated measures analysis of variance (ANOVA), while 1-way ANOVA was used to evaluate the Raof different materials within each time interval and the ΔE00values. Color coordinates within each material were compared by using paired samples t-tests (α = 0.05).

Results: Rabefore polishing was the highest for all materials (p < 0.001), while SM had its lowest Raafter CTC and AM had its lowest Raafter polishing (p ≤ 0.008). Before polishing, AM had the highest Raamong the materials (p < 0.001). After polishing, SM had higher Rathan AM (p < 0.001). After CTC, GSM had the lowest Ra(p ≤ 0.048). SM had the lowest (p ≤ 0.031) and AM had the highest (p < 0.001) ΔE00. CTC decreased the a* and b* values of SM and AM (p ≤ 0.017), and increased the L* values of AM (p < 0.001).

Conclusions: Polishing significantly reduced the surface roughness of all materials. CTC did not increase the surface roughness of materials above the clinically acceptable threshold. Only AM had perceptible color change when previously reported threshold values for denture base materials were considered.

Clinical significance: Tested denture base materials may have similar surface stability after coffee thermocycling. However, subtractively manufactured denture base materials may have improved color stability when subjected to long-term coffee consumption.

eng
Keywords
  • CAD-CAM
  • Coffee thermocycling
  • Denture base
  • Roughness
  • Stainability
Citation (ISO format)
ÇAKMAK, Gülce et al. Effect of coffee thermocycling on the surface roughness and stainability of denture base materials with different chemical compositions manufactured with additive and subtractive technologies. In: Journal of esthetic and restorative dentistry, 2023. doi: 10.1111/jerd.13136
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Article (Published version)
Identifiers
ISSN of the journal1496-4155
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