Incisal guidance angle linked to the growth and development of temporomandibular joint
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.
Findings from a recent study published in the BMC Oral Health reveal that 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, thereby indicating a correlation between incisal guidance angle and temporomandibular joint shape.
Ying Li and associates from the Stomatological Hospital of Chongqing Medical University, Chongqing, China aimed to investigate age-related morphological differences in the temporomandibular joint in subjects with different incisal guidance angle.
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). The joint morphology was assessed by linear measurements, angular measurements, and subjective evaluations. The incisal guidance angle and occlusal plane angle were also measured.
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