Analysis of Tooth Movement in Typodont Using Three-dimensional Reverse Engineering Technology

Xu-wu, LI

doi:10.1097/scs.0000000000001006

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…Wax typodonts are simple, easy to use and widely utilized in the training and study of orthodontic biomechanics, both in clinical and research settings. [12][13][14][15][16][17] However, a major limitation of the conventional wax typodont is the inability to accurately describe and quantify typodont tooth movements in 3D based on visual analysis, 18 even when only involving simple first-order activations such as archwire reshaping.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional digital assessment of typodont activations

Kang

Firth

Antoun

et al. 2022

Orthod Craniofacial Res

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Objectives Wax typodonts are widely used as pre‐clinical teaching tools to test and research the complex force systems created by archwire activations, however, a limitation is the inability to quantify the resultant statically indeterminate tooth movements. The aim of this study was to develop an analogue‐to‐digital typodont system to quantify the effects of archwire activations on individual typodont teeth in three dimensions. Methods The typodont system was developed using CAD/CAM technology. Posterior expansion, squared, tapered, asymmetrical arch forms and reversed curve of Spee activations were tested with three repeats. The resulting three‐dimensional movements of individual typodont teeth were assessed with six degrees of freedom (df). Cartesian coordinate systems were set for each tooth. Mesio‐distal, bucco‐lingual and intrusive–extrusive movements were assessed as changes in the location of the geometrically estimated centre of resistance in the x, y and z axes, respectively. Torque, tip and rotation movements were assessed as the rotations around the mesio‐distal, bucco‐lingual and intrusive–extrusive axes, respectively. Results Individual typodont tooth displacements from each activation could reliably be described with six df. The transversal‐to‐sagittal movement ratio ranged from 2:1 to 7:1, depending on the activation. Asymmetrical arch form activations caused a midline shift and affected the lateral overjet. Reversing the curve of Spee led to intrusion of incisors and second molars, extrusion of premolars and first molars and pronounced first and third order effects. Conclusion The digital typodont system is a promising teaching tool. The tested activations have implications in three dimensions, which should be considered when planning tooth movements.

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Section: Introductionmentioning

confidence: 99%

Three‐dimensional digital assessment of typodont activations

Kang

Firth

Antoun

et al. 2022

Orthod Craniofacial Res

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Three-dimensional evaluation of morphologic tooth symmetry in various malocclusions

Di̇ndaroğlu

Duran

Aras

2016

American Journal of Orthodontics and Dentofacial Orthopedics

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Dorsomedian nasopharyngeal masses with benign appearance in dogs: A retrospective medical review of 95 cases among 198 dogs (2019‐2022)

Petitpre,

Deprez,

Cervone

et al. 2024

Veterinary Internal Medicne

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BackgroundDorsomedian nasopharyngeal masses with benign macroscopic appearance are frequently observed during retrograde nasopharyngoscopy, particularly in brachycephalic breeds, but are not well described.Hypothesis/ObjectivesTo characterize these masses, assess their frequency, and identify the potential factors associated with their presence.AnimalsDogs that underwent retrograde nasopharyngoscopy at a private hospital.MethodsMedical records between November 2019 and October 2022 were retrospectively reviewed. Dogs were included if suitable nasopharynx images were available for review. Univariable and multivariable logistic regression analyses were performed to determine the factors associated with these masses.ResultsOne‐hundred ninety‐eight dogs met the inclusion criteria of which 47.9% (95/198) had a dorsal nasopharyngeal mass. The masses measured <10%, 10%‐30%, and >30% of the nasopharyngeal height in 64.2% (61/95), 28.4% (27/95), and 7.4% (7/95) of cases, respectively. Univariable analysis identified associations between the presence of a nasopharyngeal mass and several factors: brachycephalic conformation (P < .001), sleep disturbances (P = .04), presence of laryngeal collapse (P = .01), and aberrant caudal turbinates (P = .04). However, according to the multivariable analysis, only the association between the presence of a mass and brachycephalic conformation was significant (odds ratio = 2.3 [1.1; 5.0], P = .03).Conclusion and Clinical ImportanceDorsomedian nasopharyngeal masses were common in the studied dog population. These masses are mostly small and have the same appearance across breeds. Brachycephalic conformation appears to be associated with the presence of a mass.

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Analysis of Tooth Movement in Typodont Using Three-dimensional Reverse Engineering Technology

Cited by 3 publications

References 9 publications

Three‐dimensional digital assessment of typodont activations

Three‐dimensional digital assessment of typodont activations

Three-dimensional evaluation of morphologic tooth symmetry in various malocclusions

Dorsomedian nasopharyngeal masses with benign appearance in dogs: A retrospective medical review of 95 cases among 198 dogs (2019‐2022)

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