الفهرس 
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Abstract
Aim: to evaluate the efficacy of avian eggshell powder in occluding
dentinal tubules in comparison to CPP-ACP desensitizing agent (Tooth
Mousse) for treatment of dentin hypersensitivity.
Methodology: A number of 40 dentin discs were used. All dentin
discs were immersed in 6% citric acid for 2 minutes to simulate
hypersensitive dentin. Dentin discs were randomly divided into two groups
(20 discs/group); intervention (prepared eggshell slurry) group and
comparator (Tooth Mousse) group. The two groups were further divided into
2 subgroups (10 discs/ subgroup) according to immersion protocol. In the
first subgroup, dentin discs were immersed in artificial saliva for 4 weeks
whereas in the second subgroup, dentin discs underwent acid challenge using
6% citric acid for one minute. Environmental scanning electron microscope
(ESEM) evaluation of dentin discs was carried out to calculate percentage of
dentinal tubules occlusion, while hydraulic conductance test was used to
evaluate percentage reduction of dentin permeability. ESEM analysis and
hydraulic conductance test were carried out after each of the following
stages; simulation of hypersensitive dentin, application of desensitizing
agents, and immersion in either immersion protocol. Significance level was
set at P ≤ 0.05. Statistical analysis was performed using with SPSS 22.0.
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Results: The percentage of dentinal tubules occlusion results
revealed that the prepared eggshell slurry group showed significantly higher
percentage of dentinal tubules occlusion compared to Tooth Mousse group
after application of the desensitizing agents. While results of the percentage
reduction of dentin permeability revealed that there was no significant
difference between both groups. Results of the percentage of dentinal tubules
occlusion after both immersion protocols showed that the prepared eggshell
slurry significantly occluded more dentinal tubules compared to Tooth
Mousse. On the contrary, results of the percentage reduction of dentin
permeability revealed that there was no significant difference between both
subgroups after acid challenge, whereas Tooth Mousse showed significantly
higher percentage reduction of dentin permeability than the prepared
eggshell slurry after artificial saliva immersion.
Conclusion: within the limitation of this study, it was concluded that the
prepared eggshell slurry can be considered a promising material in treatment
of dentin hypersensitivity and represents a good alternative to Tooth Mousse.