Experimental study on how distal tipping of the mandibular first molar affects the direction of eruption of the second molar

概要

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We investigated how distal tipping of the mandibular first molar affects the direction of eruption of the second molar. Eight female monkeys with mixed dentition were used in this study. An extraoral force of 300g per side was applied distally to the tip of the mandibular first molars. Tantalum implants were placed in the mandible to allow accurate superimposition of serial cephalograms and to document changes in the mandibular bone following force application. The lateral cephalograms taken during the active treatment of 180 days were used to analyze tooth movement. From the cephalometric findings we concluded that first molars of the experimental animals tipped distally, and the second molars tipped mesially before eruption. However, although the second molars began to tip distally as they began to erupt, they ultimately moved distally and tipped mesially.
大阪歯科学会の論文