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Twin study-genetic comparison of matrix versus intramatrix rotation in the mandible and three different occlusal planes.
Kim, Jin Hyeong; Kim, Young Ho; Kim, Soo Jin; Sung, Joohon; Song, Yun-Mi; Shin, Jeong Won; Park, Jae Hyun; Chae, Hwa Sung.
Afiliación
  • Kim JH; Department of Orthodontics, Institute of Oral Health Science, Ajou University School of Medicine, Suwon, South Korea.
  • Kim YH; Department of Orthodontics, Institute of Oral Health Science, Ajou University School of Medicine, Suwon, South Korea.
  • Kim SJ; Department of Orthodontics, Institute of Oral Health Science, Ajou University School of Medicine, Suwon, South Korea.
  • Sung J; Department of Epidemiology, School of Public Health, Seoul National University, Seoul, South Korea.
  • Song YM; Department of Family Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea.
  • Shin JW; Department of Orthodontics, Institute of Oral Health Science, Ajou University School of Medicine, Suwon, South Korea.
  • Park JH; Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, A.T. Still University, Mesa, AZ, USA.
  • Chae HS; Department of Orthodontics, Institute of Oral Health Science, Ajou University School of Medicine, Suwon, South Korea. hwasungchae@gmail.com.
Prog Orthod ; 21(1): 44, 2020 Dec 07.
Artículo en Inglés | MEDLINE | ID: mdl-33283252
ABSTRACT

BACKGROUND:

The purpose of this study is to investigate the heritability of total rotation, matrix rotation, and intramatrix rotation of the mandible in Korean monozygotic (MZ) twins, dizygotic (DZ) twins, and their siblings. MATERIALS AND

METHODS:

The samples consisted of 75 pairs of Korean twins (39.7 + 9.26 years; MZ group, 36 pairs; DZ group, 13 pairs; sibling group, 26 pairs). Lateral cephalograms were taken, and 13 variables related to internal and external mandible rotation were measured. Three types of occlusal planes (bisected occlusal plane, functional occlusal plane, and the MM bisector occlusal plane) were used to evaluate genetic influence on the occlusal plane. Heritability (h2) was calculated by using the intraclass correlation coefficient (ICC) and Falconer's method.

RESULTS:

With regard to mandibular rotation, the MZ twin group showed significantly higher ICC values compared to the DZ twin and sibling groups. The ICC mean values for 13 cephalometric measurements were 0.85 (MZ), 0.62 (DZ), and 0.52 (siblings) respectively. The heritability of the total rotation (0.48) and matrix rotation (0.5) between the MZ and DZ groups was higher than that of the intramatrix rotation (- 0.14). All of the three types of occlusal plane showed high heritability, and among the three types, the functional occlusal plane showed the highest heritability (h2 = 0.76).

CONCLUSION:

Based on these findings that showed a strong genetic effect on total rotation and matrix rotation, maintaining these rotations should be carefully considered in the orthodontic treatment plan, while the lower border of the mandible may be responsive to various treatments. Occlusal plane change, especially with regard to the functional occlusal plane, may not be stable due to strong genetic influences.
Texto completo: Disponible Colección: Bases de datos internacionales Base de datos: MEDLINE Idioma: Inglés Revista: Prog Orthod Asunto de la revista: Odontología Año: 2020 Tipo del documento: Artículo País de afiliación: Corea del Sur

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Texto completo: Disponible Colección: Bases de datos internacionales Base de datos: MEDLINE Idioma: Inglés Revista: Prog Orthod Asunto de la revista: Odontología Año: 2020 Tipo del documento: Artículo País de afiliación: Corea del Sur