[Change of expression of matrix metalloproteinase-2 in the periodontal tissues of diabetes mellitus rats during orthodontic tooth movement].

Objective: To observe the expression and distribution of matrix mentallproteinase-2 (MMP-2) in the periodontal tissues of diabetes mellitus (DM) rats during tooth movement, and to observe the affection of diabetes mellitus on the collagen metabolism.

Methods: Eighty male Sprague-Dawley rats were used. Mesial force was applied to pull the maxillary first molar.