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Effect of grinding on the optical properties of monolithic zirconia.
Corcodel, Nicoleta; Herpel, Christopher; Rammelsberg, Peter; Rion, Kevin; Seceleanu, Irina.
Afiliación
  • Corcodel N; Department of Prosthodontics, University Hospital Heidelberg, University of Heidelberg, Heidelberg, Germany.
  • Herpel C; Department of Prosthodontics, University Hospital Heidelberg, University of Heidelberg, Heidelberg, Germany.
  • Rammelsberg P; Department of Prosthodontics, University Hospital Heidelberg, University of Heidelberg, Germany.
  • Rion K; Department of Mathematics, Bridgewater State University, Bridgewater, Massachusetts, USA.
  • Seceleanu I; Department of Mathematics, Bridgewater State University, Bridgewater, Massachusetts, USA.
J Esthet Restor Dent ; 34(6): 942-950, 2022 09.
Article en En | MEDLINE | ID: mdl-35274430
OBJECTIVES: The purpose of this study was to analyze the color infiltration in monolithic zirconia after grinding, which plays an essential role in the color stability of restorations after occlusal adjustment. METHODS: One hundred and eight white zirconia plates (36 Dentsply Sirona-Cercon high translucency [C], 36 Zirkonzahn-Prettau [P], 36 Zirkonzahn-Prettau anterior [Pa]) were stained by infiltration with target colors Vita A2, A3.5, and A4. In a standardized experimental setup, all plates were grinded in nine successive steps (from baseline to 500 µm), and color was measured with a spectroradiometer at each grinding step. Color differences ΔE00 between initial color and after each grinding step were calculated. The data was analyzed using regression, Kruskal-Wallis test, inverse prediction, and simultaneous 95%-confidence intervals. RESULTS: Grinding had a significant effect on color stability across all zirconia types and target colors (p < 0.001). At each cut level and target color, ΔE00 means for groups C, P, and Pa were statistically different (p < 0.05). Among the three zirconia types, Pa had the lowest ΔE00 mean score for cut levels 20-100 µm for A2 and between 50 and 300 µm for A3.5 and A4. For all other cut levels, differences between Pa and P were not significant (α = 0.05). C had the largest mean ΔE00 except for A4 until 100 µm, where it was second best. CONCLUSION: Zirconia type had a significant effect on the color infiltration depth across all target colors. Pa showed the best color stability until 150 µm material reduction, whereas C presented significantly less color stability than the other two zirconia materials. CLINICAL SIGNIFICANCE: Color stability is important for minimizing the risk of restoration failure due to unacceptable color changes after grinding. Pa is less susceptible to color change and has an additional buffer of 60 µm until exceeding the color acceptability threshold. When higher flexural strength is needed, P is to be preferred.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Circonio / Cerámica Tipo de estudio: Prognostic_studies Idioma: En Revista: J Esthet Restor Dent Asunto de la revista: ODONTOLOGIA Año: 2022 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Circonio / Cerámica Tipo de estudio: Prognostic_studies Idioma: En Revista: J Esthet Restor Dent Asunto de la revista: ODONTOLOGIA Año: 2022 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Reino Unido