Trueness Of Three Digital Methods For Obtaining Occlusal Relationships Article Swipe
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· 2025
· Open Access
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· DOI: https://doi.org/10.1016/j.identj.2025.104165
· OA: W4415832342
Aim or purpose: Integrating the model scanning (MS) and intraoral scanning (IOS) techniques, a new digital method, MS+IOS, was proposed to obtain full-arch occlusal relationships more accurately. Materials and methods: Three methods were used to obtain digital occlusal relationships on fifteen healthy participants: (1) IOS method: digital dental casts were automatically registered by using an intraoral scanner; (2) MS method: stone casts were digitized and registered by using a laboratory scanner; (3) MS+IOS method: digital dental casts from the MS method were registered with buccal occlusal records captured through the IOS method. Trueness was assessed by two factors: deviation values of the posterior occlusal surfaces (the primary indicator), and diagnostic tests for occlusal contacts. Additionally, the occlusal clearance values for each group were measured. Results: The maxillary casts of the MS+IOS group (-105.88 ±109.17μm) exhibited significantly smaller deviations compared with the IOS group (-223.17 ±131.25μm,P<.05) in the occlusal direction. The MS group deviated 69.87 ±140.66μm toward the gingival direction. Concerning occlusal clearance, the IOS group had the highest average negative value (-200.66±174.76μm), the MS group had the highest average positive value (536.64±48.72μm, P<.05).The MS group exhibited the lowest sensitivity for occlusal contacts (P<.001). Conclusions: Compared with the IOS and MS methods, the full-arch occlusal relationship obtained by the MS+IOS method demonstrated better trueness. The MS method exhibited a trend of occlusal separation, and the lowest sensitivity to identify occlusal contacts.
