title: Evaluation of accuracy of direct transfer snapon impression coping closed tray impression technique and direct transfer open tray impression technique: an in vitro study.
abstract: Accuracy of the implant impression technique is one of the key factor determining the strain free fit of the prosthesis fabricated which influences the treatment success. Two implant impression techniques namely the closed tray technique with transfer coping and open tray technique were evaluated for accuracy with stone casts obtained from them. Casts were evaluated using a custom constructed bar on strain gage (SYSCOM) and abutment coordinates using Coordinate Measuring Machine (TESA micro-HITE). The statistical analysis with one way ANOVA and Mann-Whitney tests show that the casts obtained with open tray technique were accurate than the casts of closed tray technique (significance P < 0.001). Direct transfer impression technique with less number of components ensures the high accuracy of transfer of implant positions from master cast to the laboratory cast compared to the indirect transfer impression technique.
authors.affiliation: 27/1, Sanjai Nagar, Erode, 638011 Tamilnadu India.
authors.forename: T
authors.initials: T
authors.lastname: Balamurugan
authors.affiliation: Department of Prosthodontics, JKK Nataraja Dental College & Hospital, Komarapalayam, Namakkal, 638183 Tamilnadu India.
authors.forename: P
authors.initials: P
authors.lastname: Manimaran
keywords: Closed tray impression technique with pick up transfer; Coordinate measuring machine; Implant impression technique accuracy; Open tray impression technique; Strain gage