Comparative Evaluation of Four Different Cordless Retraction Systems With Respect to Gingival Displacement – An in Vivo Study

Abstract

1. AIM:

The aim of the study was to evaluate and compare the effect of four cordless displacement systems on the amount of gingival displacement lateral and apical directions namely Merocel strips, Traxodent, 3M ESPE retraction pastes and Easy Stat.

1. METHODOLOGY:

Clinical efficacy of gingival retraction systems was studied as an expression of adequate lateral and apical gingival displacement by indirect assessment of the sulcus dilation with 3D intraoral digital scanning. The study was conducted at the department of Prosthodontics, and Crown and Bridge, B.V.U Dental college and hospital, Pune, on the unprepared maxillary right and left first premolars of ten selected subjects (5males and 5 females) who work in hospital, while the measurements were done at the OM dental laboratory, Ahemadnagar.

The preliminary scans of maxillary right and left 1st premolar was made using 3Shape Trios intraoral scanner. The scan was then imported as STL file to the Exocad software. The tooth was sectioned bucco-lingually. One line passing through the height of contour of the sectioned tooth and the other passing through the crest of the sectioned gingiva. The distance between the two lines gives the amount of sulcular depth in lateral direction. For evaluating the apical displacement two points were selected on scans that were not sectioned. One point at the cusp tip of the tooth and the other point selected at the deepest point of the gingival crevice. The distance between the two points gave the amount of apical displacement of gingiva.

            Four groups were designed for the purpose of recording gingival displacement.

• Group 1 -Traxodent, Hemodent Paste Retraction System.


• Group 2 - Easy Stat, Ammdent.


• Group 3 - MEROCEL, Medtronic, Xomed.


• Group 4 - 3M ESPE Retraction Capsule.

1. RESULTS:

Least amount of displacement seen with Easy Stat. Merocel strips showed promising results.

 CONCLUSION:

 Merocel strips showed promising results and should be considered as an effective material of gingival retraction.

CLINICAL SIGNIFICANCE: The cordless systems provided enough gingival displacement for the bulk of impression material to flow within the sulcus, thus recording the prepared and unprepared tooth structure and also retrieval of impression without tearing.