Читать книгу The Orthodontic Mini-implant Clinical Handbook - Richard Cousley - Страница 40

Ironically, as cigarette smoking appears to be on the decline, we are treating more patients at the upper and lower ends of the body mass spectrum. Is this relevant? Well, my clinical observation has been that adolescent patients with a low Body Mass Index (BMI) have higher failure rates. This has recently been evidenced by a CT study of maxillary cortical bone thickness and density in relation to BMI and chronological age [49]. There was a statistically significant increase in both bone parameters with an increase in both BMI and patient age. Therefore, it is reasonable to assume that young patients with a low BMI will have higher failure rates for mini‐implants. This may be partly negated by the use of midpalate sites in adolescents, assuming that indirect palate anchorage is feasible,