The study of the colorimetric characteristics of the cobalt-chrome alloys abutments covered by four different all-ceramic crowns by using dental spectrophotometer
- VernacularTitle:应用牙科分光光度比色仪对钴铬合金基底表面4种全瓷冠色度学特征的研究
- Author:
Yifan CHEN
1
;
Hongchun LIU
;
Yukun MENG
;
Yonglie CHAO
;
Changhong LIU
Author Information
- Keywords: spectrophotometer; all-ceramic; color; cobalt-chrome alloys
- From: West China Journal of Stomatology 2015;(3):226-229
- CountryChina
- Language:Chinese
- Abstract: ObjectiveThis?study?aims?to?evaluate?the?optical?data?of?the?different?sites?of?the?cobalt-chrome?(Co-Cr)?alloy?abutments?covered?by?four?different?all-ceramic?crowns?and?the?color?difference?between?the?crowns?and?target?tab?using?a?digital?dental?spectrophotometer.?Methods???Ten?Co-Cr?alloy?abutments?were?made?and?tried?in?four?different?groups?of?all-ceramic?crowns,?namely,?Procera?aluminia,?Procera?zirconia,?Lava?zirconia?(Lava-Zir),?and?IPS?E.max?glass-ceramic?lithium?disilicate-reinforced?monolithic.?The?color?data?of?the?cervical,?body,?and?incisal?sites?of?the?samples?were?recorded?and?analyzed?by?dental?spectrophotometer.?The?CIE?L*,?a*,?b*?values?were?again?measured?after?veneering.?The?color?difference?between?the?abutments?covered?by?all-ceramic?crowns?and?A2?dentine?shade?tab?was?evaluated.?Results???The?L*?and?b*?values?of?the?abut-ments?can?be?increased?by?all?of?the?four?groups?of?all-ceramic?copings,?but?a*?values?were?decreased?in?most?groups.?A?statistical?difference?was?observed?among?four?groups.?After?being?veneered,?the?L*?values?of?all?the?copings?declined?slightly,?and?the?values of a*, b* increased significantly. When compared with A2 dentine shade tab, the ΔΕ of the crowns was below 4. Conclusion???Four?ceramic?copings?were?demonstrated?to?promote?the?lightness?and?hue?of?the?alloy?abutments?effec-tively.?Though?the?colorimetric?baseline?of?these?copings?was?uneven,?veneer?porcelain?can?efficiently?decrease?the?color?difference?between?the?samples?and?thee?target.
