Construction of virtual intercuspal occlusion: Considering tooth displacement

Abstract

Common impressions cannot accurately duplicate the dental occlusion under occlusal force due to tooth displacement and mandibular deformation. To establish new methods to construct virtual intercuspal occlusion and assess their construction accuracy. The intraoral occlusal contacts of posterior teeth of 15 subjects were recorded with 8 μm and 100 μm articulating paper, respectively, and the marked teeth and buccal bite data were scanned with an intraoral scanner. The virtual dental occlusions were separately determined by buccal bite registration (BBR) method, and 3 new methods, namely segmented tooth registration (STR), occlusal contact areas (marked by 8 μm articulating paper) registration (OCR) and mixing registration (MR) methods. With the intraoral contact areas marked by 100 μm articulating paper set as reference and contact areas of the 4 virtual occlusions as tests, sensitivity, positive predictive value (PPV) and the ratio of overlapping areas were calculated. Kruskal‐Wallis test or 1‐way ANOVA was used to analyse the difference among groups. The sensitivity ranged from 0.69 to 0.94 and the PPV from 0.67 to 0.90. Sensitivity of OCR group and PPV of STR and OCR groups were different from that of BBR group at overlapping threshold of 50% (P = .028, .028 and .006). There was statistical difference of the ratio of overlapping areas over reference areas, and the values of STR and OCR groups were higher than that of BBR group (P = .045 and .021). The ability of STR and OCR methods to construct virtual intercuspal occlusion was better than BBR method.

Effect of a novel interocclusal recording method on occlusal accuracy of implant‐supported fixed prostheses: A randomized clinical trial

“…in the same mechanical articulator with the working casts mounted with the interocclusal record randomly‐allocated as above. Considering the physiologic mobility of natural teeth when occluding (Li et al, 2021; Miura et al, 1998), the implant prostheses' occlusal clearance in working casts was designed to achieve light contact by extracting a 38‐μm articulating paper (SHOFU) with light resistance in MIP. The implant prostheses' occlusal contacts in both MIP and eccentric position were detected using a 100‐μm articulating paper (BK‐51 Blue and BK‐52 Red; Dr. Jean Bausch GmbH) in working casts.…”

“…in the same mechanical articulator with the working casts mounted with the interocclusal record randomlyallocated as above. Considering the physiologic mobility of natural teeth when occluding (Li et al, 2021;Miura et al, 1998) Subsequently, the crown's axial surface was colored and glazed.…”

Artificial intelligence-designed single molar dental prostheses: A protocol of prospective experimental study

“…3. Functional occlusal morphology –the maxillary and mandibular teeth models will be mounted to a virtual articulator (exocad; DentalCAD, exocad) at average setting and the whole system is instructed to perform simulated jaw movements to determine if there is any occlusal interference [ 9 , 37 ].…”

Morphological design of occlusal wear facets for the mandibular first molar crown using different bite registration methods

“…The results showed that the virtual dental occlusion constructed using the STR method demonstrated a better location, count, and area of intraoral occlusal contacts than that of the BBR method. But the occlusal contacts recorded with 100 µm articulating paper were set as the reference in the previous study 20 . All points less than 100 µm of the occlusal surfaces between casts can be calculated.…”

“…[16][17][18][19] Prostheses made using these digital casts exhibit no contact or have light occlusal contacts, resulting in lower masticatory efficiency. 15,17 Considering tooth displacement under bite force, a segmented tooth registration (STR) method was established 20 to construct virtual dental occlusion. The digital dentitions were segmented into single teeth, and the single teeth were aligned to buccal bite data respectively, to conform to the displacement of teeth under bite force.…”