Changes in color and staining of dental composite resins after wear simulation.
OBJECTIVE
The objectives were to measure the discoloration as well as the change in staining of composite resins after wear simulation.


METHODS
Generalized wear simulation was performed with a three-body wear testing device for 400,000 cycles for six composite resins. A flat-planed stylus made with polyacetal resin was loaded perpendicularly under a load of 76-80 N. Color of nonworn and worn areas was measured with a spectrophotometer before and after staining with 0.5% methylene blue solution. Nonworn surface served as a control. Differences in color between nonworn and worn surfaces were calculated to indicate the change in color due to wear. Color change after staining with 0.5% methylene blue solution for nonworn and worn surfaces was calculated to observe the changes in staining.


RESULTS
Color difference (DeltaE(*) (ab)) between nonworn and worn surfaces was in the range of 0.8-1.4 before staining, which increased to 1.1-3.9 after staining. Color change by staining with methylene blue in nonworn surface was 6.8-20.6, and that in worn surface was 5.2-17.8. Therefore, staining in nonworn surface was higher than that in worn surface (p < 0.05). Generalized wear simulation for approximately 3 years of clinical service resulted in acceptable color change before staining (DeltaE(*) (ab) < 3.3). After staining, color difference between nonworn and worn surface increased to not-acceptable value in one composite resin investigated.
Lee
Yong-Keun
YK
Department of Dental Biomaterials Science, Dental Research Institute, College of Dentistry, Seoul National University, Seoul, Korea. ykleedm@snu.ac.kr
Lu
Huan
H
Oguri
Makoto
M
Powers
John M
JM
D000080:Acetals / Q000737:chemistry; D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D008422:Materials Testing; D008751:Methylene Blue / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D012996:Solutions / Q000737:chemistry; D013053:Spectrophotometry; D013194:Staining and Labeling; D013499:Surface Properties
D000080:Acetals; D003188:Composite Resins; D003764:Dental Materials; D011108:Polymers; D012996:Solutions; C016067:polyacetal; D008751:Methylene Blue