This review of coronectomy versus extraction of third molars in patients at increased risk of inferior alveolar nerve (IAN) injuries included 42 observational studies. The findings indicate lower a reduction in the odds of IAN sensory loss in favour of coronectomy and an increase in the odds of surgical reintervention.
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This review investigating whether the presence of third molars during sagittal split osteotomy of the mandible increases the risk of complications included 15 studies. The findings suggests no statistically significant relationship between the presence of 3Ms and complications. However a majority of the studies were retrospective with 13 studies being considered to be at high risk of bias so the certainty of the evidence is considered to be very low.
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This review of variables associated with surgical difficulty in the extraction of third molars included 16 prospective cohort studies suggesting a number of variable that may be associated with surgical difficulty.
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This review of coronectomy for management of impacted mandibular third molars included 14 studies suggesting that it is safe and reliable with a low failure rate (7%).
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This review of panoramic radiography for IAN injury prediction after third molar surgery included 8 studies calculating key diagnostic data fro the 7 classical used signs. Values were to low to rule out post-operative damage before surgery but some siigns could rule in risk of injury.
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As this review looks as potential harms from bilateral sagittal split osteotomy a wide range of study designs were included. However, the majority relied on subjective assessment of Inferior alveolar nerve injury so a standardised assessment and reporting procedure is needed.
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