Comparative evaluation of efficacy of gingival retraction using three different gingival retraction system with aluminium chloride astringent; retraction cord, copper wire reinforced retraction cord and astringent retraction paste: A randomised control study.

Patients for this study will be selected from O.P.D of department ofprosthodontics, at the Manubhai Patel dental college, Vadodara. Patients will be informed about the nature of then investigation;and written informed consent will be obtained prior to enrolment. After signing the consent form, each subject will undergo a completeoral examination by the principle investigator. Diagnostic impressions of the upperand lower arches will be made and the impressions will be poured in type IVdental stone. After tooth preparation, impression will be made withgingival retraction and impression will be poured in type IV dental stone. The casts that obtained from the die stone,will be sectioned perpendicular to the coronal plane at the center of the prepared tooth with thehelp of a mechanical saw. Thesesectioned casts will be used for measurement under the stereomicroscope.