Age limitation on provision of orthopedic therapy and orthognathic surgery.

Canadian orthodontists were surveyed by mail to determine the latest skeletal age at which they would recommend orthopedic therapy and orthognathic surgery and the earliest at which they would recommend orthognathic surgery. For the purposes of this introductory study, orthopedic therapy implied stimulation of physiologic response using appliance force, without specification of appliance type. Response rate from 512 orthodontists was 65% (n = 334), with the response rate by item varying from 92% to 95%. By Greulich and Pyle standards, the latest recommended age for orthopedic therapy was at 97% completion of skeletal growth (females 13.5 years, males 15 years), whereas the earliest recommended age for orthognathic surgery was when skeletal growth is 99% complete (females 14.9 years, males 16.5 years). Surgery would be recommended by 32% of respondents for a patient before the age of 8 years, if deformity is severe. For orthognathic surgery, respondents either perceived no age maximum or recommended 69 years, the maximum age on the questionnaire item. Orthodontists' traits influenced recommendations for timing treatment.