Impressing for Excellence: Special Impression Techniques for Compromised Ridges: Case Report

Introduction: Prosthodontic rehabilitation of a patient withcompromised edentulous ridges in a conventional manneris a difficult task. Modifications in the treatment proceduresshould be considered to fulfil the patient's functional andesthetic desires.Case report: This case report describes various compromisedsituations like atrophic ridges, flabby ridges and knifeedge ridges encountered in a routine clinical practice andmodification of treatment plan for each of them.Conclusion: The treatment modifications for compromisedridges starts from accurate impression making which recordmaximum denture bearing area without interference withmovements. Recording the entire functional denture-bearingarea ensures maximum retention, stability and support for thedenture during use.

Accuracy of new implant impression technique using dual arch tray and bite impression coping

PURPOSE: The purpose of this in vitro study was to evaluate the accuracy of a new implant impression technique using bite impression coping and a dual arch tray. MATERIALS AND METHODS: Two implant fixtures were placed on maxillary left second premolar and first molar area in dentoform model. The model with two fixtures was used as the reference. The impression was divided into 2 groups, n=10 each. In group 1, heavy/light body silicone impression was made with pick up impression copings and open tray. In group 2, putty/light body silicone impression was made with bite impression copings and dual arch tray. The reference model and the master casts with implant scan bodies were scanned by a laboratory scanner. Surface tessellation language (STL) datasets from test groups was superimposed with STL dataset of reference model using inspection software. The three-dimensional deviation between the reference model and impression models was calculated and illustrated as a color-map. Data was analyzed by independent samples T-test of variance at α=.05. RESULTS: The mean 3D implant deviations of pick up impression group (group 1) and dual arch impression group (group 2) were 0.029 mm and 0.034 mm, respectively. The difference in 3D deviations between groups 1 and 2 was not statistically significant (P=.075). CONCLUSION: Within limitations of this study, the accuracy of implant impression using a bite impression coping and dual arch tray is comparable to that of conventional pick-up impression.

An innovative impression technique for fabrication of a custom made ocular prosthesis.

Various impression and fitting techniques have been described in the past for restoring ocular defects. The present article describes a new direct impression technique for recording and rehabilitating ocular defects, by custom‑made ocular prosthesis. All the techniques described in the history, mainly concentrated in recording the tissue surface of the defect, which made it difficult to contour the palpebral surface resulting in the poor esthetics of the prosthesis. The present impression technique uses heavy bodied polyvinyl siloxane impression material, which facilitates accurate recording of the tissue surface and the palpebral surface of the defect, resulting in the fabrication of functionally and esthetically acceptable prosthesis.