Spatial Relationships between the Mandibular Central Incisor and Associated Alveolar Bone in Adults with Mandibular Prognathism

Yamada, Chiaki; Kitai, Noriyuki; Kakimoto, Naoya; Murakami, Shumei; Furukawa, Souhei; Takada, Kenji

doi:10.2319/072906-309

Cited by 86 publications

(101 citation statements)

References 15 publications

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“…Definitions of the variables are provided in Table 1. [8][9][10][11][12] Transformation of the functions into nonlinear forms made with reference to the normative values 13 and the authors' expertise knowledge were then applied to the variables. To generate feature vectors, 1000 combinations of feature variables were heuristically.…”

Section: Methodsmentioning

confidence: 99%

Computational Formulation of Orthodontic Tooth-Extraction Decisions

Takada

Yagi

Horiguchi

2009

The Angle Orthodontist

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Objective:To develop a mathematical model that simulates whether or not to extract teeth in optimizing orthodontic treatment outcome and to formulate the morphologic traits sensitive to optimizing the tooth-extraction/nonextraction decisions. Materials and Methods: A total of 188 conventional orthodontic records of patients with good treatment outcomes were collected, and dentofacial morphologic traits, along with their degrees of influence in the optimized model, were determined. Results: The rate of coincidence between the recommendations given by the optimized model and the actual treatments performed was found to be 90.4%. The major morphologic traits and their corresponding influences in improving the simulation accuracy of the model were the incisor overjet (3.0) and the size of the basal arch relative to the sum of the mesiodistal crown diameters of the upper dentition (2.4) and the lower dentition (2.0). The remaining 22 morphologic-trait variables were also found to be indispensable in achieving robust simulation readings. Conclusion: A mathematical model that simulates whether or not to extract teeth in optimizing orthodontic treatment outcomes with a success rate of 90.4% at its prediction performance was developed. This model has 25 morphologic traits with four major categories (sagittal dentoskeletal and soft tissue relationship, vertical dentoskeletal relationship, transverse dental relationship, and intra-arch conditions) that affected the accuracy in determining optimal tooth extractions/nonextractions. (Angle Orthod. 2009;79:885-891.)

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Section: Methodsmentioning

confidence: 99%

Computational Formulation of Orthodontic Tooth-Extraction Decisions

Takada

Yagi

Horiguchi

2009

The Angle Orthodontist

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“…Additionally, according to our results, in Class III patients there was a negative correlation between the mandibular plane and cortical LP, to such an extent that the width of the lingual cortex of the symphysis decreased as mandibular plane divergence increased. In a previous study 27 in subjects with Class III, the root apex was closer to the buccal cortical due to the fact that the incisor is more lingually inclined. However, vertical facial growth pattern was not considered.…”

Section: Evaluation Of Symphysis Dimensionsmentioning

confidence: 99%

Lower incisor dentoalveolar compensation and symphysis dimensions among Class I and III malocclusion patients with different facial vertical skeletal patterns

Molina-Berlanga

Llopis-Perez

Flores-Mir

et al. 2013

The Angle Orthodontist

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Objective: To compare lower incisor dentoalveolar compensation and mandible symphysis morphology among Class I and Class III malocclusion patients with different facial vertical skeletal patterns. Materials and Methods: Lower incisor extrusion and inclination, as well as buccal (LA) and lingual (LP) cortex depth, and mandibular symphysis height (LH) were measured in 107 lateral cephalometric x-rays of adult patients without prior orthodontic treatment. In addition, malocclusion type (Class I or III) and facial vertical skeletal pattern were considered. Through a principal component analysis (PCA) related variables were reduced. Simple regression equation and multivariate analyses of variance were also used. Results: Incisor mandibular plane angle (P , .001) and extrusion (P 5 .03) values showed significant differences between the sagittal malocclusion groups. Variations in the mandibular plane have a negative correlation with LA (Class I P 5 .03 and Class III P 5 .01) and a positive correlation with LH (Class I P 5 .01 and Class III P 5 .02) in both groups. Within the Class III group, there was a negative correlation between the mandibular plane and LP (P 5 .02). PCA showed that the tendency toward a long face causes the symphysis to elongate and narrow. In Class III, alveolar narrowing is also found in normal faces. Conclusions: Vertical facial pattern is a significant factor in mandibular symphysis alveolar morphology and lower incisor positioning, both for Class I and Class III patients. Short-faced Class III patients have a widened alveolar bone. However, for long-faced and normal-faced Class III, natural compensation elongates the symphysis and influences lower incisor position. (Angle Orthod. 2013;83:948-955.)

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“…It is widely accepted that the anteroposterior thickness of the alveolar bone in the symphysis region determines the distance available for orthodontic movement of the incisors. The labio/lingual inclination of the central incisor significantly correlates with the labiolingual inclination of the associate alveolar bone (Yamada et al, 2007). Numerous studies have shown that if the incisor root apex is moved against the cortical plate of the alveolar or beyond the alveolar, severe root resorption and bony dehiscence may occur (Richmond et al, 1998;Apajalahti et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…The following landmarks and reference lines were designated to indicate mandibular incisal positioning and its relation with the surrounding alveolar bone (Figure 2) (Yamada et al, 2007):…”

Section: Measuring Parametersmentioning

confidence: 99%

The Association between Lower Incisal Inclination and Morphology of the Supporting Alveolar Bone — A Cone‐Beam CT Study

Pan

et al. 2009

Int J Oral Sci

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Spatial Relationships between the Mandibular Central Incisor and Associated Alveolar Bone in Adults with Mandibular Prognathism

Cited by 86 publications

References 15 publications

Computational Formulation of Orthodontic Tooth-Extraction Decisions

Computational Formulation of Orthodontic Tooth-Extraction Decisions

Lower incisor dentoalveolar compensation and symphysis dimensions among Class I and III malocclusion patients with different facial vertical skeletal patterns

The Association between Lower Incisal Inclination and Morphology of the Supporting Alveolar Bone — A Cone‐Beam CT Study

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