Comparative study on spectrophotometric and visual methods for color stability of denture base resin
10.3760/cma.j.issn.1002-0098.2011.04.013
- VernacularTitle:分光光度法与目测法测量义齿基托树脂色稳定性的比较研究
- Author:
Li-Li LOU
1
;
Gang ZHENG
;
Hong LIN
;
Rui ZHENG
Author Information
1. 北京大学口腔医学院口腔医院
- Keywords:
Esthetics,dental;
Denture bases;
Composite resins
- From:
Chinese Journal of Stomatology
2011;46(4):241-244
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the relationship between the spectrophotometric and visual methods in evaluating the color stability of denture base resin, and determine the threshold color difference of denture base resin in the spectrophotometric method. Methods Two kinds of denture base resin were respectively fabricated into 33 specimens whose color differences varied from indistinguishable to obvious.Each of the specimens was assessed respectively by 30 human observers and a SP62 spectrophotometer. The results of visual assement were recorded as "indistinguishable change", "light change" or "severe change",while the spectrophotometric color differences ( △ E) were calculated. In each group, a logistic curve was explored to determine the relationship between the color difference ( △ E) and the ratio of "severe change".Results The R squares of logistic curves were 0. 93 and 0. 94 respectively. The threshold color differences in the spectrophotometric method were 2. 87 and 2. 82 respectively. Conclusions A high relevance between the spectrophotometric and visual methods in evaluating the color stability of denture base resin was found.The threshold color differences for different color denture base resins were similar.
