Review Points to 4-Degree Threshold for Surgical Correction of Occlusal Cant

Posted: September 30, 2026

Review Points to 4-Degree Threshold for Surgical Correction of Occlusal Cant

Edited by Dentaltown staff

Isolated mandibular surgery can correct moderate lip-line cants with soft tissue results comparable to two-jaw surgery, while severe vertical discrepancies require differential maxillary impaction, according to a systematic review published Sept. 28 in BMC Oral Health.

The review, registered in PROSPERO, included 23 observational studies of patients with skeletal Class II or Class III malocclusion and facial asymmetry complicated by occlusal cant. Of those studies, eight were rated good quality, 10 moderate, and five poor.

One-jaw mandibular surgery was effective for moderate lip-line cants ranging from 1.5 to 6 degrees. The authors proposed a visual threshold of 4 degrees as a clinical guide for determining whether surgical intervention is needed.

Three-dimensional imaging was identified as essential for distinguishing transverse from vertical asymmetry. The authors wrote that 3D imaging has redefined the cause of occlusal cant as primarily a manifestation of vertical ramal asymmetry.

The review also found significant buccal tipping of maxillary molars on the deviated side, a compensation pattern the authors said calls for specific presurgical decompensation to prevent relapse.

Neha Shani, Prajwal Shetty, Ravi M S, and Shilpa M of the A B Shetty Memorial Institute of Dental Sciences at NITTE (Deemed to be University) in Mangalore, India, conducted the review. It received no specific funding, and the authors declared no competing interests.

All included studies were observational, and fewer than half were rated good quality, which limits how firmly the proposed 4-degree threshold can be applied as a treatment rule.

Sources:
BMC Oral Health, “Management of occlusal cant in skeletal Class II and Class III patients: a systematic review,” published online Sept. 28, 2026:
link.springer.com/10.1186/s12903-026-09872-5


Review Points to 4-Degree Threshold for Surgical Correction of Occlusal Cant

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