Gap-toothed youngsters may not be the only ones who are a little sore when they leave the orthodontists office. While they sport tight braces on their teeth, their doctors may be nursing tight, aching backs, according to a study from the University of Alberta.
A study of graduate orthodontic students at the university and a practising orthodontist--whod been working for 18 years--showed that long hours of bending low and working in patients mouths put heavy strain on the lower back and neck--burdens that translated into weights of up to 138 kilograms in males and 93 kg in females. The total duration of daily work would amount to an hours continuous load on the spine of 450 kg for men and 275 kg for women.
Results of the study appear in the February issue of Clinical Biomechanics. The subjects, aged 27 to 36, (the practicing professional was 48) were videotaped performing their regular duties and the recorded postures were analysed frame by frame for top to bottom compression load, side to side shearing load and exposure time.
Bev Betkowski | EurekAlert!
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