Morphologic characteristics of the dentition and palate in cases of skeletal asymmetry.

The purpose of this study was to clarify the three-dimensional morphological characteristics of the dentition and palate in skeletal asymmetry in patients with skeletal Class III malocclusion using a newly defined palatal reference plane in a dental cast. Twenty patients (5 males and 15 females) who had skeletal Class III malocclusion with facial asymmetry were selected. Pretreatment posteroanterior cephalometric radiographs and maxillary dental casts were used. The lateral deviation of Me was measured as the distance from a line perpendicular to Lo-Lo' that passed through CG. The angle between the Lo-Lo' plane and the J-J' plane was measured. Each maxillary dental cast was measured using a three-dimensional surface-scanning system, and the newly defined palatal reference plane was calculated. The right/left difference in the radius of curvature of the palate and right/left differences in the vertical and mesiodistal positions of the first molars were analyzed. Linear correlation and regression techniques were used. Our findings demonstrate that the lateral deviation of the mandible is closely related to the morphology of the alveolar process and to the vertical height of the dentition. In this study, the three-dimensional application of a new palatal reference plane is very useful in morphological research, and the results provide detailed information on the characteristics of facial asymmetry.

[1]  Seiji Haraguchi,et al.  Facial asymmetry in subjects with skeletal Class III deformity. , 2009, The Angle orthodontist.

[2]  D. Hatcher,et al.  Cortical bone mineral density in asymmetrical mandibles: a three-dimensional quantitative computed tomography study. , 2001, European journal of orthodontics.

[3]  S M Shah,et al.  An assessment of asymmetry in the normal craniofacial complex. , 2009, The Angle orthodontist.

[4]  K. Kula,et al.  Dental arch asymmetry in the mixed dentition. , 1998, The Angle orthodontist.

[5]  L. Farkas,et al.  Facial asymmetry in healthy North American Caucasians. An anthropometrical study. , 1981, The Angle orthodontist.

[6]  B Trpkova,et al.  Craniofacial asymmetry and temporomandibular joint internal derangement in female adolescents: a posteroanterior cephalometric study. , 2000, The Angle orthodontist.

[7]  Kazuo Hayashi,et al.  A novel method for the three-dimensional (3-D) analysis of orthodontic tooth movement-calculation of rotation about and translation along the finite helical axis. , 2002, Journal of biomechanics.

[8]  L. Kaban,et al.  Occlusal cant in the frontal plane as a reflection of facial asymmetry. , 1997, Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons.

[9]  G. Janson,et al.  Three-dimensional evaluation of skeletal and dental asymmetries in Class II subdivision malocclusions. , 2001, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[10]  P. Pirttiniemi.  Associations of mandibular and facial asymmetries-A review. , 1994, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[11]  R Kikinis,et al.  Development of a three-dimensional treatment planning system based on computed tomographic data. , 2002, International journal of oral and maxillofacial surgery.

[12]  S. Bishara,et al.  Dental and facial asymmetries: a review. , 2009, The Angle orthodontist.

[13]  T Kuroda,et al.  Three-dimensional dental cast analyzing system using laser scanning. , 1996, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[14]  Ikumasa Hayashi,et al.  Relationships among facial type, buccolingual molar inclination, and cortical bone thickness of the mandible. , 2001, European journal of orthodontics.

[15]  P. Pirttiniemi,et al.  Relationship between craniofacial and condyle path asymmetry in unilateral cross-bite patients. , 1990, European journal of orthodontics.

[16]  B. Kusnoto,et al.  Reliability of a 3D surface laser scanner for orthodontic applications. , 2002, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[17]  Proffit Wr,et al.  The prevalence of facial asymmetry in the dentofacial deformities population at the University of North Carolina. , 1997 .

[18]  T Kuroda,et al.  A 3D computer-aided design system applied to diagnosis and treatment planning in orthodontics and orthognathic surgery. , 1999, European journal of orthodontics.

[19]  Kazuo Hayashi,et al.  Three-dimensional analysis of dental casts based on a newly defined palatal reference plane. , 2003, The Angle orthodontist.

[20]  K. Fushima,et al.  Facial asymmetry in temporomandibular joint disorders. , 1999, Journal of oral rehabilitation.