Abstract
Although surgical correction of prognathism improves appearance of the patients in most cases, it sometimes happens that they are not necessarily satisfied with the operation. We thought that the most important reason for this might be personality tendencies. Therefore, we administered a personality inventory (the Yatabe-Guilford personality inventory) and a questionnaire before the operation and one year after the operation to 60 patients who came to our clinic.Their personality tendencies were first classified into 5 types in terms of the so-called Y-G personality types. Second, we analyzed the relation between the personality type and the response to each item of the questionnaire. Moreover, we analyzed the changes in patients' personality types as well as the scale values of the Y-G personality inventory before and after the operation.The results obtained are summarized as follows:1. Relation between the Y-G type and the response to the questionnaire administered after the operation(1) According to the multivariate analysis of contingency table (MAC), the Y-G personality type was the D-type (the director type), the B-type (the black-list type), the C-type (the calm type), the A-type (the average type), and the E-type (the eccentric type), in order of degree of satisfaction with the operation.(2) Moreover, the five Y-G types were divided globally into two groups, one including the B and D types, and the other including the A and E types. The former consists of patients who were satisfied very much with the operation and the latter consists of those who were not necessarily satisfied with the operation.2. Change in the Y-G personality inventory before and after the operation(1) Decreases in depression and inferiority feelings and increases in thinking extroversion and ascendance were both statistically significant.(2) Personality types of 33. 3% of the patients changed to emotionally stabler or more extraversive ones, while only 6. 7% of the patients changed to more introversive ones.
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