Mandibular condylar cartilage response to moving 2 molars in rats.
BACKGROUND
The purpose of this study was to investigate the responses of mandibular condylar cartilage to moving 2 molars in different combinations.


METHODS
Rats were assigned to male and female control and experimental groups (each, n = 5). Elastic rubber bands were used to move medially the maxillary left and the mandibular right first molars in experimental group I. The same method was used to distally move the maxillary left and the mandibular right third molars, 2 mandibular third molars, and 2 maxillary third molars in experimental groups II, III, and IV, respectively. At the end of the eighth week, all condyles were examined histologically. The areas of histologic change as a percentage of total cartilage area were compared by using the Mann-Whitney U test.


RESULTS
Cartilage degenerative remodeling was observed in experimental groups II, III, and IV. The percentage areas of degenerative remodeling were higher in female experimental groups II and III than in the female control group, and in female experimental group II than in female experimental group IV and male experimental group II (all, P <0.05).


CONCLUSIONS
The mandibular condylar cartilage of female rats responded variously to different combinations of molar movement; the most obvious remodeling was observed in groups in which the maxillary left and mandibular right third molars were moved.
Jiao
Kai
K
Department of Oral Anatomy and Physiology and TMD, School of Stomatology, Fourth Military Medical University, Xi'an, China.
Wang
Mei-Qing
MQ
Niu
Li-Na
LN
Dai
Juan
J
Yu
Shi-Bin
SB
Liu
Xiao-Dong
XD
D000818:Animals; D002357:Cartilage Diseases / Q000473:pathology / Q000503:physiopathology; D002358:Cartilage, Articular / Q000473:pathology / Q000503:physiopathology*; D016022:Case-Control Studies; D049109:Cell Proliferation; D019902:Chondrocytes / Q000473:pathology; D003593:Cytoplasm / Q000473:pathology; D016326:Extracellular Matrix Proteins / Q000032:analysis; D005260:Female; D008297:Male; D008310:Malocclusion / Q000503:physiopathology*; D008335:Mandibular Condyle / Q000473:pathology / Q000503:physiopathology*; D008963:Molar / Q000473:pathology*; D008964:Molar, Third / Q000473:pathology; D009142:Musculoskeletal Physiological Phenomena; D009967:Orthodontic Appliances; D011509:Proteoglycans / Q000032:analysis; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley; D012737:Sex Factors; D014087:Tooth Movement Techniques / Q000295:instrumentation
D016326:Extracellular Matrix Proteins; D011509:Proteoglycans