The precision of central jaw relationship estimation in restorative dentistry

Abstract

The aim of the study was to investigate accuracy of the most frequently used methods of obtaining centric relation in clinical practice. Finding of CR was carried out in clinic of prosthodontic dentistry on a 5 patients with intact dentition using four methods that are most often used, including: bimanual manipulation, leaf gauge, using an anterior deprogrammind device, the technique of determining CR with intraoral devices recording the gothic angle. To assess the accuracy of each technique there were performed 10 registrations of the central relation by one operator (200 CR registrations), with 30 minutes' intervals between the CA determination. Analysis of the contacts in CR were carried out using a photometric method of investigation. The graphic images were downloaded in Adobe Photoshop for calculation, metric data translated into digital values. The studies above showed that the accuracy of finding CR in all methods were not ideal. It can be noted that the smallest deviation of the position of the first contact in the CR was observed with use of the anterior deprogrammind device and with the intoral gothic angle recording device. The deviation along the VO axis was 0.039±0.002 mm and 0.084±0.004 mm respectively, along the MD axis 0.043±0.002 mm and 0.054±0.001 mm, respectively. The greatest error of recording the CR was shown by bimanual manipulation Dawson technique, the deviation along the axis of the VO and MD was 0.634±0.04 mm and 0.388±0.04 mm, respectively.

Semidirect Resin Composite Veneers in a Patient with Bruxism

“…Following angle classification, occlusal examination indicated normal occlusion class 1 malocclusion, characterized by the mesiobuccal cusp of the upper first molar occluding with the buccal groove of the lower first molar [28,29]. The occlusal surfaces of the posterior teeth were intact, with no signs of flattening, fractures, chipping, or looseness.…”

“…Canine-guided occlusion, a form of mutually protected occlusion, ensures the disengagement of posterior teeth during lateral mandibular movements, thanks to the vertical and horizontal overlap of the canine teeth [42]. Given the importance of proper Case Reports in Dentistry cuspid guidance in protecting the incisal edges of the anterior teeth from abrasion and abfractions [28,29], direct resin composite restorations were applied to the incisal edges of the canine teeth (element #6) and the first premolars (element #11).…”

Posiciones Mandibulares de Referencia Clínica. Una Descripción Narrativa

“…Debido a su relevancia en la práctica clínica, a lo largo de los años se han ido desarrollado diferentes técnicas para su registro, las cuales han sido analizadas y comparadas en diferentes estudios, muchos de los cuales concluyen que la técnica de manipulación mandibular de Dawson es actualmente una de las más reproducibles, y se considera un método consistente para el registro de RCF (Orozco et al), esta técnica proporciona la relajación de los músculos masticatorios mediante la manipulación manual no forzada de la mandíbula. Se requiere de una deprogramación previa, de tal manera de borrar el engrama neuromuscular existente y lograr llevar correctamente a la ATM a relación céntrica fisiológica, logrando obtener un resultado más preciso (Stafeev et al, 2018). Esto se puede realizar a través de: Jit de Lucía (Lucia, 1964), el uso de férulas (Forsell et al, 1999), u otras técnicas, para lograr interrumpir la propiocepción y lograr un registro más exacto (Wilson & Banerjee, 2004).…”

Comparative Analysis of the Reproduction Accuracy of Main Methods for Finding the Mandible Position in the Centric Relation Using Digital Research Method. Comparison between Analog-to-Digital and Digital Methods: A Preliminary Report

“…The choice of the centric relation method and the accuracy of its reproduction are determined by a number of criteria that must be taken into account in the clinic. At the present stage, indications and contraindications for choosing the method of finding the mandible position are not sufficiently recognized, therefore it is very difficult to prioritize a particular method [12]. Only by assessing the degree of precision of the various methods, which would allow the development of certain clinical recommendations for their use, can this problem be solved more effectively.…”