Laboratory investigation of Accuracy of Impression Materials for Border Molding

Abstract

Introduction: Border molding of the edge of the individual impression tray is an important stage of prosthetic treatment of edentulous jaws, which often depends on the final result of the treatment. Classical thermoplastic impression materials for border molding have positive qualities that make them preferable by clinicians for their hardness, unlimited manipulation time and high impression sharpness. Modern silicone impression materials for border molding have long manipulating time and appropriate viscosity to allow dentists to perform functional tests. Aim: To determine the accuracy of different impression materials for border molding of individual impression trays. Materials and methods: Four impression materials for border molding were laboratory tested: Kerr impression compound green sticks and thermoplastic GC Iso functional sticks, additive type silicone Detaseal function and condensation type silicone sta-seal f. A modified individual impression tray designed by authors was used, allowing for laboratory load and stability. Ten impressions were taken and their formed edges were measured at 10 points three times - immediately after hardening/elasification, and 24 hours and 48 hours after hardening/elasification. Results: The results were analysed using ANOVA repetition analysis, where a statistically insignificant difference in the accuracy of three of the impression materials for border molding was established, except the C-type of silicone. Conclusions: Good manipulative qualities and measured accuracy in laboratory tests define these materials as very good for border molding procedures.

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“…In prosthodontics it appears indispensable to transfer the view from the mouth to the casts. Sometimes mistakes occur and collaboration between dental technician and a dentist interrupts, wherefore appropriate treatment cannot be accomplished [4][5][6][7][8][9]. Accordingly, one of the most important factors how to maintain this professional communication is taking into account the correct determination of custom tray borders, border molding and impressions [4][5][6][7][8].…”

“…Sometimes mistakes occur and collaboration between dental technician and a dentist interrupts, wherefore appropriate treatment cannot be accomplished [4][5][6][7][8][9]. Accordingly, one of the most important factors how to maintain this professional communication is taking into account the correct determination of custom tray borders, border molding and impressions [4][5][6][7][8]. Treatment becomes especially difficult in edentulous patients with health disorders, so that we have decided to announce our clinical case.…”

“…Treatment becomes especially difficult in edentulous patients with health disorders, so that we have decided to announce our clinical case. The purpose of this case report study was to perform an objective treatment for a patient with one side facial paralysis, to determine the borders of an upper jaw custom tray and to assure impression is ready to be sent to the laboratory [7,9,10].…”