Growth rhythms of the cartilage of the mandibular condyle: effects of orthopaedic appliances.
The growth rate of the cartilage of the mandibular condyle in the young rat exhibits: - a circadian cycle with a maximum of the 3H-thymidine labelled cells around 13(00) and a minimum around 01(00); with a maximum in the number of mitoses around 21(00) and a minimum around 09(00). - a circannual cycle with a maximum in May and a minimum between November and January, and with a difference in rhythms between May and November. The condylar cartilage growth in response to orthopaedical appliances of the mandible is modified and exhibits: - circadian variations. - circannual variations. The responsiveness of the condylar cartilage to orthopaedic appliances is greater when the condylar cartilage growth rate is higher.
D000818:Animals; D002356:Cartilage / Q000254:growth & development*; D002940:Circadian Rhythm; D008297:Male; D008335:Mandibular Condyle / Q000254:growth & development*; D008938:Mitosis; D009967:Orthodontic Appliances; D051381:Rats; D012621:Seasons