The application of laser holograph-speckle interferometry for measuring rotation of abutment teeth / 中华口腔医学杂志

ABSTRACT

<p><b>OBJECTIVE</b>To explore the rotation of abutment teeth of fixed partial denture in chewing and to analyze the effect of rotation on the stability of abutment teeth.</p><p><b>METHODS</b>Left mandible (without the second premolar and the first molar) was used for specimen. Holograph-speckle interferometry was employed for measuring the rotation angle.</p><p><b>RESULTS</b>The maximal rotation angle was no more than 0.6 degrees and change of the angle was obviously in nonlinearity, when load increased from 9.8 N to 225.4 N.</p><p><b>CONCLUSIONS</b>The laser holograph-speckle interferometry could be used to measure rotation of abutment teeth. The intricate surface contacting was the main reason for rotation and this rotation had no bad effect on abutment teeth of fixed partial denture in daily use.</p>