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Estimation of the Bennett mandibular immediate side shift in Iraqi full mouth rehabilitation patients

Author: Ma'an Rasheed Zakaria معن رشيد زكريا
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2014 Volume: 26 Issue: 4 Pages: 54-62
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Controversy exists concerning the presence and amount of the Bennett mandibular immediate sideshift among patients and whether it is necessary to accommodate for it in adjustable articulators. The aim of thisstudy was to register and calculate the amount of any immediate side shift (ISS) present in patients requiring fullmouth rehabilitation.Materials and methods: 3- dimensional condylar movements of 50 Iraqi TMD-free patients were recorded using astereographic fully adjustable articulator system during protrusion, left and right eccentric mandibular movements.Protrusive angles of each patient were verified to figure out the suitable fossa analog for each case. The thickness ofeach right and left premade fossa analog selected was measured with a vernier caliper and was tightly secured inthe articulator fossa compartment. Functionally-generated path recordings were performed using custom-madeintraoral clutches. Bennett ISSs, verified by the stereographic system in the molded fossae, were measured using thevernier caliper. The final right and left ISSs were estimated by subtracting the thickness of the blank fossa analog fromthat of the molded one. The final ISSs were recorded and statistically compared.Results: Stereographic recordings of eccentric mandibular movements revealed ISSs within all patients involved in thisstudy. The ISSs varied among the patients and bilaterally within them. Their average values ranged between 0.80 mmfor females and 1.68 mm for males, showing significant statistical differences between them but with no relevancy toage advancement. Mean values of ISSs of males' and females' mandibular left joints were more than those recordedby their right joints.Conclusion: Verifying the mandibular ISS in the molded fossae is an essential step to efficiently rehabilitate full mouthcases; thus it would be helpful to use a fully adjustable articulator system to restore complicated cases since veryminor intraoral occlusal adjustments might be required for the finished restorations prior to the final cementation

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