A comparison of different methods and materials to establish maximal intercuspal position

Van den Bergh, Herman Theo
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Purpose: This was an in-vivo study to determine the most reliable method to record a patient’s maximal intercuspal position by using two common methods with two popular registration materials. Materials and Methods: One set of full arch impressions of both jaws was done with vinyl polysiloxane impression material (Position Penta Quick, 3M ESPE, Germany) followed by four interocclusal registrations for each participant. One registration technique required more than one registration as the patient had to close through two different materials (Anutex Toughened modelling wax, Kemdent, UK and Jet Blue Bite, Coltene Whaledent, USA). In a second technique Jet Blue Bite (Coltene Whaledent, USA) was injected laterally/ buccally between the occluded tooth surfaces after mouth closure. Models were cast in type 4 stone under strict conditions and measurements done with a digital vernier calliper, accurate to 100 microns. Hand articulation of the casts were used as the control.Results: Statistical analysis showed significant discrepancies when the patient closed through both wax and PVS materials. No statistically significant differences to the control group were present when PVS was injected laterally after closure. Conclusions: Hand articulation proved to be the most accurate method to reproduce the maximal intercuspal position, in the fully dentate patient with horizontal and vertical occlusal stability. In all other clinical situations an appropriate combination of materials may be necessary, including the possibility of digital registrations.
A research report submitted in partial fulfilment of the requirements for the gegree of MSc (Dent) to the Faculty of Health Sciences, School of Oral Health Science, University of the Witwatersrand, Johannesburg, 2020