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The relation between incisal guidance angle and the growth and development of temporomandibular joint: a multi-cross-sectional retrospective study.
Li, Ying; Zhou, Wenwen; Wu, Yan; Dai, Hongwei; Zhou, Jianping.
Afiliação
  • Li Y; Stomatological Hospital of Chongqing Medical University, No. 426 Songshi North Road, Chongqing, China.
  • Zhou W; Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China.
  • Wu Y; Stomatological Hospital of Chongqing Medical University, No. 426 Songshi North Road, Chongqing, China.
  • Dai H; Stomatological Hospital of Chongqing Medical University, No. 426 Songshi North Road, Chongqing, China.
  • Zhou J; Stomatological Hospital of Chongqing Medical University, No. 426 Songshi North Road, Chongqing, China.
BMC Oral Health ; 21(1): 380, 2021 07 28.
Article em En | MEDLINE | ID: mdl-34320973
ABSTRACT

BACKGROUND:

The incisal guidance angle (IGA) is related to temporomandibular joint (TMJ), and changes to the IGA are often involved in the prosthetic and orthodontic treatment of anterior teeth. However, the influence of incisal guidance on the growth, development and remodelling of the TMJ is not yet clear. The aim of this study was to investigate age-related morphological differences in the TMJ in subjects with different IGAs.

METHODS:

Cone-beam computed tomography (CBCT) images of 274 patients were included (group 1, IGA < 45°; group 2, 45° ≤ IGA ≤ 60°; group 3, IGA > 60°). Each group was then divided into 4 age groups (group a, 6-12 years; group b, 13-16 years; group c, 17-25 years; group d, 26-33 years). TMJ morphology was assessed by linear measurements, angular measurements, and subjective evaluations. The IGA and occlusal plane angle were also measured.

RESULTS:

Anterior inclination of condyle (AIC) increased with age in the three IGA groups but decreased from 17 years onward in group 2 (P < 0.05). In the age groups analysis, the AIC in group 1 was smaller than that in group 3 but larger than that in group 2 (P > 0.05). Articular eminence inclination (AEI) decreased with age in group 1 (P = 0.027) but increased with age in group 3 (P = 0.053). The AEI in group 2 was larger than that in group 1 at 17-25 years (P = 0.046), and it was larger in group 3 than in group 1 at 26-33 years (P = 0.047). The IGA had a weak correlation with AEI (P < 0.05).

CONCLUSION:

The articular fossa of patients with shallower incisal guidance changed to a flatter shape with age, whereas the condylar anterior slope and articular eminence of patients with steeper incisal guidance changed towards a steeper alignment. There was a correlation between IGA and TMJ shape.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Articulação Temporomandibular / Côndilo Mandibular Tipo de estudo: Guideline / Observational_studies / Prevalence_studies / Risk_factors_studies Limite: Adolescent / Child / Humans Idioma: En Revista: BMC Oral Health Assunto da revista: ODONTOLOGIA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: China

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Articulação Temporomandibular / Côndilo Mandibular Tipo de estudo: Guideline / Observational_studies / Prevalence_studies / Risk_factors_studies Limite: Adolescent / Child / Humans Idioma: En Revista: BMC Oral Health Assunto da revista: ODONTOLOGIA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: China