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A STUDY THE SHADE CHANGE OF SEVERAL KINDS OF ALL CERAMIC CROWNS USED FOR METAL DOWEL CORE 금속 다우엘코어에 사용된 수종의 전부도재관의 색조변화에 관한 연구
Sung-Il Hur, Heon-Song Lim, Ju-Hwan Lim, In-Ho Cho
허성일, 임헌송, 임주환, 조인호

The purpose of this study is to compare and analyze the shade changes(ΔE*) about In-Ceram®,
IPS-Empress®, OPC® by using of the spectrophotometer arising from inital status and before and
after cementation of the resin cement mounted on the metal core. We used a couple of statistics
such as  “One- Way ANOVA”and  “Multiple Range Test.”We could be able to verify significantly
what is being discussed here up to 95%. The results drawn from our research are as follows:
1. At the time of our experiments regarding the initial shapes of all-ceramic and mounting sta-
tus of all-ceramic on the metal crown(ΔE*1), and a comparison of mounting of all ceramic on
the metal crown with all-ceramic cemented on the metal core(ΔE*2), at the time of shade change
of initial shapes and after we cemented on the metal core.
(1) no significant difference among all-ceramics was found.
(2) no particular difference was found regarding the In-Ceram®.
(3) a significant difference between the ΔE*1 and ΔE*2 regarding the IPS-Empress® was
found(P<0.05).
(4) a significant difference between the ΔE*1 and ΔE*2 regarding the OPC® was found(P<0.05).
2. When we compared the shade changes(ΔE*) resulted from before and after the cementation
on each of the parts involved of some all-ceramic, we could be able to find shade change increase
form incisal third, middle third, and cervical third in that order in In-Ceram®(spinell), IPS
Empress®,  and OPC® all.  In  addition, we  could  be  able  to  find  a  significant  difference
between cervical third and incisal third, middle third. (P<0.05)
From what we have just seen, we might conclude that there is a signficant shade change dif-
ference before and after the cementation with respect to IPS-Empress® and OPC®. In addition,
we could also be able to find more shade change difference at the cervical third rather than incisal
third and middle third depending on the parts involved.

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