Holographic Methods for the Evaluations of Gingival Margins Retractions

摘要

The retraction of the gingival margins was evaluated by holographic methods using a He Ne laser with 1mV. The impressions of the maxillary dental arch were taken from the patient in the first visit and then after six month. The hologram of the first model was superposed on the model cast of the second model. The retractions of the gingival margins could be evaluated three-dimensional on every point of interest.