الفهرس 
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Abstract
Aim: This clinical trial aimed at evaluation biological and esthetical success of ceramic onlay
restorations while preparing the teeth using shoulder finish line preparation versus butt joint
with bevel preparation.
Methodology: 30 participant’s were enrolled with a total 38 teeth (upper premolars) indicated
for ceramic onlay restorations. According to the two different preparation designs, teeth to be
restored were randomized into two groups: group(S) for onlay preparation design with shoulder
finish line and group(B) for onlay preparation design with butt joint with bevel. Preparations
were scanned with intra-oral scanner. Restorations were designed in exocad software then wax
try-in restoration was milled in InLab MC X5 milling machine. After try-in wax restoration
was invested then Lithium disilicate (e.max press) ingots were pressed into the final lithum
disilicate glass ceramic restoration. Onlay restorations were cemented and evaluated for
postoperative sensitivity, recurrent caries, marginal discoloration, color match and patient
satisfaction using modified USPHS criteria and followed up for one year. All qualitative data
were provided as frequency and percentages, and Chi-square tests were used for all
comparisons.
Results: Using Chi-square statistical test the two groups were compared. Statistically
significant difference was recorded in color match and patient satisfaction were favorable in
group (B) while in marginal discoloration there was a statistically significant difference in favor
for group (S). On the other hand for recurrent caries and postoperative sensitivity revealed nonsignificant difference between the both groups.
Conclusions: ceramic onlay restorations with butt joint bevel exhibited better, color match and
patient satisfaction. While ceramic onlay with shoulder finish line demonstrated better
marginal color stability while for recurrent caries and postoperative sensitivity both groups
showed satisfactory performance through the follow-up period.