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Hardness of celluloid strip-finished or polished composite surfaces with time.

Authors
 Sung-Ho Park  ;  Ivo Krejci  ;  Felix Lutz 
Citation
 Journal of Prosthetic Dentistry, Vol.83(6) : 660-663, 2000 
Journal Title
JOURNAL OF PROSTHETIC DENTISTRY
ISSN
 0022-3913 
Issue Date
2000
MeSH
Analysis of Variance ; Composite Resins* ; Dental Polishing/instrumentation ; Dental Polishing/methods* ; Dental Polishing/statistics & numerical data ; Hardness ; Hardness Tests/methods ; Light ; Surface Properties ; Time Factors
Abstract
STATEMENT OF PROBLEM:
An in-vitro study revealed that a celluloid strip-finished composite surface discolored more than the polished composite surface. Thus, the celluloid strip-finished composite surface may not cure enough compared with the polished composite surface.

PURPOSE:
This study tested the hypothesis that the celluloid strip-finished composite surface did not cure enough compared with the polished composite surface.

METHODS AND MATERIAL:
The composite was placed in a 1.5-mm thick aluminum mold and the upper surface was covered with a celluloid strip. Composite was light cured for 60 seconds, then a layer of approximately 200 microm thick was ground away from the lower surface and polished. The hardness of the upper composite surface that was polymerized under a celluloid strip and the polished lower surface were measured with Vickers hardness measuring instrument 15 minutes, 6 hours, and 6 days after light curing. The hardnesses of polished and celluloid strip-finished surfaces were compared using a paired t test. One-way ANOVA and Tukey was used for tests for the significant differences in hardnesses between 15 minutes, 6 hours, and 6 days after light curing for a given surface.

RESULTS:
Microhardness of the celluloid strip-finished composite surface was 380.6 N/mm(2) at 15 minutes, 442.5 N/mm(2) at 6 hours, and 519.2 N/mm(2) at 6 days after light curing. Microhardnesses of the polished composite surface was 476.6 N/mm(2) at 15 minutes, 511.7 N/mm(2) at 6 hours, and 535.0 N/mm(2) at 6 days after light curing. The hardness of the celluloid strip-opposed composite surface was significantly lower than that of the polished surface 15 minutes and 6 hours after light curing (P <. 001). There was no difference in hardness between the celluloid strip-opposed surface and the polished surface on the sixth day.

CONCLUSION:
The hardness of the celluloid strip-opposed composite surface was lower than that of the polished surface at 15 minutes and at 6 hours after light curing. However, there was no difference in microhardness in 6 days.
Full Text
https://www.sciencedirect.com/science/article/pii/S0022391300700679
DOI
10.1016/S0022-3913(00)70067-9
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Conservative Dentistry (보존과학교실) > 1. Journal Papers
Yonsei Authors
Park, Sung Ho(박성호) ORCID logo https://orcid.org/0000-0003-2171-235X
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/171868
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