الفهرس 
REVIEW OF LITERATUREOnly 14 pages are availabe for public view
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Abstract
The purpose of this study was to evaluate the degree of time dependent wear of antagonist
natural enamel and patient satisfaction for zirconia reinforced lithium silicate when compared to
monolithic zirconia crowns at 0,3,6,1 year follow up periods.
Methodology: A total of 26 posterior teeth (7 females and 4 males) were selected for this study with
an age range of 20-60. Then they were divided into two groups (1&2) according to the masking
method (N=13). First group received monolithic zirconia crowns over posterior teeth up to two crowns
per patient. Second group received zirconia reinforced lithium silicate crowns over posterior teeth up
to two crowns per patient. Immediately after cementation of the restoration addition silicone
impression were taken and epoxy model were poured. Then assessment of the restoration for patient
satisfaction and shade matching was done postoperatively. Wear of enamel antagonist of the two
groups were assessed using 3D Profilometer measured in micrometer through the epoxy model made
after the follow up visits 3-6-12 month followed by evaluation of the Patient satisfaction of the two
groups which were assessed using VAS (visual analogue scale questionnaire that collect history of
reactions) which is represented by a scale from 1-10
Results: Repeated measures Analysis of Variance (ANOVA) was used to study the effect of ceramic
type, time and their interactions on mean Ra. Bonferroni’s post-hoc test was used for pair-wise
comparisons when ANOVA test is significant. For non-parametric data; Mann-Whitney U test was
used to compare between the two ceramic types. Friedman’s test was used to study the changes by time
within each ceramic type. Qualitative data were presented as frequencies and percentages. Fisher’s
Exact test was used to compare between the groups. The significance level was set at P ≤ 0.05.
Statistical analysis was performed with IBM SPSS Statistics for Windows, Version 23.0. Armonk, NY:
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IBM Corp. VAS scores data showed non-normal (non-parametric) distribution while age and Ra data
showed normal (parametric) distribution. Data were presented as mean, standard deviation (SD),
median and range values. For parametric data, Student’s t-test was used to compare between mean age
values in the two groups.
Conclusion: The ceramic type (regardless of the time) has an effect on the surface roughness (RA)
of the antagonist enamel while time (regardless of the ceramic type) had no effect on the antagonist
surface roughness, polished monolithic zirconia is an enamel friendly restoration showing acceptable
enamel wear behavior. Enamel wear doesn’t seem to increase by time with properly polished
monolithic restorations. Monolithic zirconia restorations showed less satisfaction with esthetics than
Zirconia reinforced lithium silicate ceramic restorations.