Oxytalan fibre response to tooth intrusion and extrusion in normal and lathyritic mice

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Abstract
Springs were applied to the mandibles of normal mice to produce intrusion of one first molar and extrusion of the opposite first molar. Treatments were randomly allocated to the right and left sides of the jaw. The experiment was repeated in lathyritic mice. Hostologic sections demonstrated that major oxytalan fibres underwent marked changes in their angle of attachment to the cementum when comparing an intruded tooth with its extruded counterpart in either normal or lathyritic animals. A sample of 10 angular readings was tken from each tooth. A mixed model analysis of variance showed a significant difference at the 1% level in the angle attributed to the type of treatment applied. The data lend support to the hypothesis that oxytalan fibres are capable of independent function within the normal and also the pathologically affected periodontal ligament of mice.

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