Effect of prosthodontic planning on lateral occlusion scheme: a comparison between conventional and digital planning

Abstract

Recently, digital wax-up is proposed as a tool to aid prosthodontic planning. However, there are no data about the effect of prosthodontic planning on lateral occlusion scheme. Objective: This study aims to evaluate the impact of conventional and digital prosthodontic planning on lateral occlusion scheme.Material and Methods : Dental models of 10 patients were collected. All models had Angle Class I occlusion and were undergoing prosthodontic treatment that would influence the lateral occlusion scheme. Each set of models had received both conventional wax-up and digital wax-up. In relation to the lateral occlusion scheme, the following variables were evaluated: the prevalence of the different lateral occlusion scheme, number of contacting teeth and percentage of each contacting tooth. Four excursive positions on the working side were included: 0.5, 1.0, 2.0 and 3.0 mm from the maximal intercuspation position.Results : The lateral occlusion scheme of the two wax-up models was subjected to alterations following excursion. There was a tendency for the prevalence of canine-guided occlusion to increase and for the prevalence of group function occlusion to decrease with increasing excursion. The number of contacting teeth was decreasing with the increasing magnitude of excursion. For the 0.5 mm and 1.0 mm positions, the two wax-ups had significantly greater contacts than the pre-treatment models, while at the 2.0 mm and 3.0 mm positions, all the models were similar. For all models, canines were the most commonly contacting teeth, followed by the teeth adjacent to them. No difference was observed between the two wax-ups in relation to the number of contacting teeth.Conclusion : Although the prosthodontic planning had influenced the pattern of the lateral occlusion scheme and contacts, there was no difference between the conventional and digital prosthodontic planning.

Comparison of Canine-Guided Occlusion with Other Occlusal Schemes in Removable Complete Dentures: A Systematic Review

“…In contrast, with CGO, the posterior teeth disengage during all excursive movements of the mandible, with the canine teeth making a vertical and horizontal overlap [14]. In centric occlusion, both types of schemes have simultaneous occlusal contacts; however, they differ in occlusal contacts during excursive/eccentric movements [44,45]. The selection of the optimal or appropriate occlusal scheme for edentulous patients has economical and clinical significance [36,43,45].…”

Geometrical effects of conventional and digital prosthodontic planning wax-ups on lateral occlusal contact number, contact area, and steepness

“…After disappearance of all contacts on the working side, the mandibular cast was shifted vertically toward the maxillary cast by 0.05 mm. This process could be used to detect the existing working-side contacts that control lateral occlusion (20). In this experiment, all lateral occlusion variables were evaluated for each working side.…”

“…In this experiment, all lateral occlusion variables were evaluated for each working side. Because virtual simulation of condylar movement is unreliable, non-working side contacts were not considered (20). To ensure standardization, the virtual casts of all patients were subjected to a similar pattern of virtual movement.…”