Bone Height and Extractions Study
Research type
Research Study
Full title
A randomised controlled trial to assess the alveolar bone height distal to the lower second molar following either coronectomy or extraction of the adjacent impacted lower third molar.
IRAS ID
249253
Contact name
Mark Ide
Contact email
Sponsor organisation
King's College London
Duration of Study in the UK
1 years, 6 months, 0 days
Research summary
The lower wisdom tooth, is commonly not fully through in the mouth, and often needs removal. This tooth is often close to a nerve inside the jaw, and removal of the tooth can cause permanent loss or altered sensation to the lip, chin, teeth and gums on the affected side. Lower wisdom teeth tilted forwards are commonly associated with damage to the support of the neighbouring teeth (lower second molars). It is assumed that maintenance of the wisdom teeth or removal of these teeth may compromise the lower second molars. A procedure called a coronectomy, which involves removal of the crown of the tooth only, is a valid treatment option to significantly reduce the risk of inferior alveolar nerve damage. In this procedure, the roots of the tooth are left in situ but covered completely so they are not left exposed in the mouth. Over time, these roots can migrate towards the surface. This effect, along with the bone-preserving technique of a coronectomy, may provide increased bone height behind the adjacent lower second molar. This would increase the support around the lower second molar and may help maintain or improve gum health.
This study will investigate if coronectomies improve the bone levels behind the lower second molars, compared with complete removal (extractions). Patients requiring extraction of two lower wisdom teeth that are tilted forwards and are not judged to be in close proximity to the nerve, will be recruited. All participants will be treated by a Consultant.The lower wisdom teeth will be randomised into receiving a coronectomy or extraction. Patients will be followed up 1 week by phone or email, and at 3, 6 and 12 months with a clinical examination, and radiographic examination at 6 and 12 months. All research activity will take place at Guy's Hospital Dental Institute.
REC name
London - City & East Research Ethics Committee
REC reference
19/LO/1575
Date of REC Opinion
17 Oct 2019
REC opinion
Favourable Opinion