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The present study investigated the tolerance of left-right deviations in the arrangement of the upper middle artificial teeth relative to the median line of the face. For this purpose, the alignment of the maxillary incisor relative to the median line of the face was used as a point of reference.The model photos used for this investigation were prepared by combining 5 photos of both the face and the rows of teeth. In a stimulation series, the center of the row of teeth was displaced either to the left or to the right, and magnitude of this displacement was evaluated by groups of dentists, patients and students, who examined these photos. The results were classified into 5 reaction categories. According to magnitude adaptation level and estimation method, the left-right deviation tolerance was determined by psychological judgement.The results revealed that the lowest average tolerance of measuring 2.586mm was reported by the group of dentists, followed by values of 3.704mm and 4.204mm, which were reported by patients and students, respectively.

Tolerance of Left-right Deviations on the Arrangement of the Upper Middle Artificial Teeth.