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Coronectomy with adjunctive GBR significantly reduces root
migration. It also attenuates the probability of long-term exposure and need
for further surgery for the removal of the exposed root.
Coronectomy with adjunctive guided bone regeneration (GBR)
involved the least root migration, reported by a study carried out by Yiu Yan
Leung; Faculty of Dentistry, The University of Hong Kong. As the affected
mandibular third molars extraction close to the inferior alveolar nerve (IAN)
may result in neurologic damage and coronectomy is used as an alternative
surgical approach. However, this surgical approach was greatly influenced by
root migration.
Therefore, Dr Yiu Yan Leung proposed a randomized
split-mouth clinical analysis to assess the incidents of root migration and
surgical morbidities related to adjunctive GBR along with or without
coronectomy. The coronectomy with adjunctive GBR (study group) given to the one
side and coronectomy alone (control group) on the other side of the lower third
molars. Afterwards, a two years follow-up was done and involved examination of
surgical morbidities, adjacent second molar periodontal regeneration root migration,
and root exposure rate.
A total of 48 patients were selected. No root exposure was
seen during the review period. Both groups exhibited statistically similar
extent of infection and pain rate at all time-points. The study group showed
less root migration after 3 months; with only 1mm migration in 2 years. Also,
no difference was seen in the periodontal attachment regeneration between the
groups. This explains the adjunctive GBR is an efficient approach to reduce the
root migration rates during the mandibular third molar surgery.
Clinical Oral Investigations
Guided bone regeneration to reduce root migration after coronectomy of lower third molar: a randomized clinical trial.
Yiu Yan LEUNG
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