Randomisation will use the method of randomly permuted blocks with variable block size. Enrolled participants will be assigned a study number at the time of surgery. The envelope with group assignment will be opened after completion of the surgical exposure (prior to wound closure). For subjects randomised to the test group, alveolar-decortication will then be carried out prior to wound closure. While the surgeon cannot be blinded for obvious reasons, group assignment will not be disclosed to the patient and will not be disclosed to the orthodontist.