Three-Dimensional Evaluation of Morphological Asymmetry of Maxillofacial Complex in Patients Showing Mandibular Prognathism with Facial Asymmetry

Wakamatsu, Takanori; Yamaki, Masaki; Hanada, Kooji; Hayashi, Takafumi; Saito, Isao

doi:10.5927/jjjd1991.17.29

Cited by 3 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Regarding the use of 3-D CT imaging for analysis, one report notes that whereas cases with remarkable asymmetry in the maxilla are rare, as is dispersion between cases, there are also cases in which the maxilla is in a location asymmetrical to the skull. It was also noted Three-dimensional Analysis that in the mandible, in most cases, asymmetry was found in the mandible itself, but no large difference was observed between cases 31) . Measurement of horizontal (X) change in distance between T1 and T2 in the maxilla in the present study revealed values of 1.0 mm for U6TC and 0.2 mm for ANS, indicating only minimal change.…”

Section: Distance Measurement 1) T1 and T2 Assessmentmentioning

confidence: 89%

“…This agrees with the tendency for the mandible to move more than the maxilla. It has been noted that Me in the mandible is the furthest reference point from the upper face, and that even a minimal deviation in the lower face from the upper-or mid-face is easily noticed 31) . Indeed, a significant difference was found in ME between T1 and T2 in the present study (p=0.021).…”

Section: Distance Measurement 1) T1 and T2 Assessmentmentioning

confidence: 99%

See 1 more Smart Citation

Three-dimensional Analysis and Evaluation in Orthognathic Surgical Cases with Facial Asymmetry

Kogou

Takaki

Shibahara

2018

Bull. Tokyo Dent. Coll.

View full text Add to dashboard Cite

Two-dimensional cephalometric analysis is commonly used in planning and evaluating the outcome of orthognathic surgery. It is difficult to arrive at an accurate evaluation with this method, however, as the jaw bones overlap in profile. Therefore, the purpose of this study was to use 3-dimensional (3-D) orthognathic treatment planning software for measurement of distances and angles to evaluate change in dentofacial morphology and stability after orthognathic surgery in patients with jaw deformity and facial asymmetry. Computed tomography with SimPlant O&O (Materialize Dental, Belgium) was used to obtain data at before surgery (T1) and at 1 month (T2) and 1-2 years postoperatively (T3). Reference points, reference planes, and evaluation items were set to measure angles and distances. The average values at T1, T2, and T3 and the standard deviations were obtained. The analyses of change in distance and angle between T1 and T2 in both the maxilla and mandible revealed that the amount of postoperative deviation and change was greatest in the mandible (p<0.05). These findings showed a correlation between postoperative change in position of the chin and symmetry. Only a minimal amount of change was observed between T2 and T3 in both the maxilla and mandible. The results also revealed a correlation between positional change in both the proximal and distal bone segments and stability. It was found to be possible to determine change in horizontal, vertical, and anterior/posterior angle in both the maxilla and mandible by such 3-D analysis. The results suggest that the chin is the most appropriate facial element for evaluation of symmetry after orthognathic surgery.

show abstract

Section: Distance Measurement 1) T1 and T2 Assessmentmentioning

confidence: 89%

Section: Distance Measurement 1) T1 and T2 Assessmentmentioning

confidence: 99%

Three-dimensional Analysis and Evaluation in Orthognathic Surgical Cases with Facial Asymmetry

Kogou

Takaki

Shibahara

2018

Bull. Tokyo Dent. Coll.

View full text Add to dashboard Cite

show abstract

“…Jaw deviation usually involves both the maxilla and mandible. To date, however, various types of jaw deviation have been relatively challenging to visualize using three-dimensional (3D) techniques [ 5 ]. It is reported that two-dimensional cephalometric prediction such as STO (Surgical Treatment Objectives) [ 6 ] is still popular but not proper to precisely analyze remarkable facial symmetric cases.…”

Section: Introductionmentioning

confidence: 99%

A three-dimensional investigation of mandibular deviation in patients with mandibular prognathism

Osawa

Nihara

Nishiyama

et al. 2023

Maxillofac Plast Reconstr Surg

Self Cite

View full text Add to dashboard Cite

Background Craniofacial disharmony in cases of jaw deformity associated with abnormal lateral deviation of the jaw mostly involves both the maxilla and mandible. However, it has been still difficult to capture the jaw deviation aspect in a 3-dimensional and quantitative techniques. In this study, we focused on 3-dimensional mandibular morphology and position of the condylar head in relation to the base of the skull in patients with mandibular prognathism, one of the most common jaw deformities. We used cluster analysis to quantify and classify deviation and clarified its characteristics. We also investigated the degree of correlation between those findings and menton (Me) deviation measured on frontal cephalograms, which is a conventional indicator of jaw deformity. Results Findings obtained from 100 patients (35 men, 65 women) were classified into the following three groups based on mandibular morphology and condylar position relative to the skull base. Then, reclassification using these parameters enabled classification of cluster analysis findings into seven groups based on abnormal jaw deviation characteristics. Comparison among these seven groups showed that the classification criteria were ramus height, mandibular body length, distance from the gonion to the apex of the coronoid process, and the lateral and vertical positions of the mandible. Weak correlation was also found between Me deviation on frontal cephalograms and each of the above parameters measured on 3D images. Conclusions Focusing on mandibular morphology and condylar position relative to the skull base in patients with mandibular prognathism, we used cluster analysis to quantify and classify jaw deviation. The present results showed that the 3D characteristics of the mandible based on mandibular morphology and condylar position relative to the skull base can be classified into seven groups. Further, we clarified that Me deviation on frontal cephalograms, which has been used to date, is inadequate for capturing jaw deviation characteristics.

show abstract

A Study in Subjective Evaluation and Gaze Point Analysis of Facial Symmetry: Analysis Using Eye-tracking

Kato

Kobayashi

Hasebe

et al. 2009

Jpn. J. Jaw Deform.

View full text Add to dashboard Cite

Three-Dimensional Evaluation of Morphological Asymmetry of Maxillofacial Complex in Patients Showing Mandibular Prognathism with Facial Asymmetry

Abstract: The present study was designed to three-dimensionally evaluate the morphological asymmetry of maxillofacial complexes such as the maxilla and the mandible, and the state of the maxillary and mandibular deviation in the

Cited by 3 publications

References 0 publications

Three-dimensional Analysis and Evaluation in Orthognathic Surgical Cases with Facial Asymmetry

Three-dimensional Analysis and Evaluation in Orthognathic Surgical Cases with Facial Asymmetry

A three-dimensional investigation of mandibular deviation in patients with mandibular prognathism

A Study in Subjective Evaluation and Gaze Point Analysis of Facial Symmetry: Analysis Using Eye-tracking

Contact Info

Product

Resources

About