Abstract
Background: Prolonged retention of provisional restoration is depends upon the long term affinity between restoration and teeth structures which depend upon the use of good mechanical characteristics, low solubility, and superior adhesion quality of luting cement which also resist bacterial and molecular penetration. Hence, assessment of marginal leakage of provisional restorative materials sealed with provisional cements using the standardized procedures is essential.
 Aim: This study aimed at in vitro study of microleakage of 4 provisional cements, a cavity base compound and a zinc-phosphate luting cement in provisional acrylic resin crowns fixed on extracted human teeth.
 Material & Methods: The teeth with acrylic restorations were randomly divided into 6 groups of 6 specimens each. Each group received different types of temporary cement. Acrylic resin crowns were made and fitted on intact human premolars with the 4 cements. All restorations were applied in a standardized manner. Specimen were submerged in a 2% methylene blue solution, then sectioned and observed under a stereomicroscope for the detection of marginal microleakage. Obtained data were subjected to ANNOVA and Chi –square test to know statistical significant difference between different groups. P value less than 0.05 was considered significant.
 Results and observation: Mean frequency of microleakage was statistically significant among all the groups under study with Pvalue<0.017.
 Conclusion: Among all the temporary cement, Zinc-phosphate cements has the best property with reduced microleakage. Even it is used as cavity base but can be used as good temporary cement as far as microleakage is concerned.
 Key words, Microleakage, provisional cement, restorations, crowns, in vitro
Highlights
There are number of fixed prosthodontic restorations or fixed partial dentures using metal and integral ceramics available for provisional restoration
During the process of provisional restoration, it is importantly taken into consideration that restorations adequately protects the pulp from peripheral stimuli, sustain the position of teeth, maintain correct occlusion and must be fabricated in such a manner which allow easy cleaning by patient [1]
In addition, primordial factors which affect the success of restoration ; are remain stable in mouth until final restoration occur, no dislodgment should be there as it can damage restoration, secondary factors which affect its stability are as pulpal and periodontal alterations, modifications in tooth positioning, cavities and social constraint
Summary
There are number of fixed prosthodontic restorations or fixed partial dentures using metal and integral ceramics available for provisional restoration. Luting cement is basically used as temporary cementing media for provisional restorations. This cementation provides several clinical applications like providing aesthetic look, better for mouth hygiene, improved articulation in the mouth of patient, abutment teeth management, periodontal treatment and occlusal adjustments, dislodgment of teeth, Dr Jagjeet Singh et al, International Journal of Medical and Biomedical Studies (IJMBS). Aim: This study aimed at in vitro study of microleakage of 4 provisional cements, a cavity base compound and a zincphosphate luting cement in provisional acrylic resin crowns fixed on extracted human teeth. Conclusion: Among all the temporary cement, Zinc-phosphate cements has the best property with reduced microleakage. Microleakage, provisional cement, restorations, crowns, in vitro
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