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Quantitative assessment to the condylar chondrogenesis triggered by bite jumping appliance

WT5”BX]SHEN Gang, U.Hgg, A.B.M.Rabie, et al Department of Orthodontics, School of Stomatology, Shanghai Second Medical University, Shanghai 200011 [WT5”HZ]  
Objective This study was designed to quantify the chondrogenesis and its relationship with the bone remodeling in mandibular condyle under the condition of mandibular protrusion triggered by bite jumping appliance.[WT5”HZ]Methods [WT5”BZ]One hundred SD rats with age of 5 weeks were selected and divided into 5 experimental groups (n=15) and 5 control groups (n=5). Animals in experimental groups were imposed with bite jumping appliance which caused identical magnitude of mandibular protrusion. The animals of experimental groups, together with their matched controls, were sacrificed 3,7,14,21 and 30 days after the appliance insertion. Sections were cut from TMJ through sagittal plane and stained with HE. The area of the chondrocytes in each zone of condylar cartilage was measured by using a computer assisted image analyzing system(Leica Q 550IW).[WT5”HZ]Results [WT5”BZ](1) The area of chondrocytes of all cartilaginous zones in experimental animals decreased more drastically than that in controls.(2) The erossive zone decreased gradually and was finally replaced by new bone at day 30.[WT5”HZ]Conclusion [WT5”BZ]Chondrogenic alteration in condylar cartilage caused by bite jumping appliance precedes the new bone formation in mandibular condyle. [WT5”HZ]
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