Panagraphic X-선상에 의한 악골낭종의 임상적 의의

CLINICAL EVALUATION OF JAW BONE CYSTS ON PANAGRAPHIC ROENTOGENOGRAPHS (STATUS-X)

The author has analyzed 155 films taken by way of Panoramic projection technique (Status-X) which were diagnosed as Cysts, for the purpose of clinical and statistical evaluation of cysts and determination. of utility of Status-X in diagnosis of jaw bone cysts. The results were as follows; I. In the usefulness of Status-X in diagnosis of cysts 1) The magnifying ratio of tooth length showed maximal degree in molar portion at the rate of 156.93% in maxillae, and in mandibles 61.42% of it. 2) The rate of cone-cut showed maximal rate of 27.45% in the anterior portion in maxillae, and that of 14.28% in the same portion of mandible. 3) Among almost of the maxillary films (as much as 92.17%) and 72.50% of the mandibular films, the author could discover the overlapped blurring image. The unrecognizability of lamina dura was also analyzed. II. In the clinical and statistical analysis of cysts 1) In the age distribution of occurrence, the maximal degree of occurrene was found at the age group of 21-30 in male and at that of 21-30 in female, and also found at the age group of 31-40 in maxillae of male and at that of 21-30 in maxillae of female, and in mandibles, found at the age group of 11-30 in male and at that of 31-40 in female. 2) The cysts involved, at the maximal degree, the right and left central incisors of male and left lateral incisors of female in maxillae and in mandibles, the left central incisors of both sexes. 3) Each cyst involved about 4.3 teeth in maxillae of male, 3.0 teeth in maxillae of female, 3.2 teeth in male and 2.3 teeth in mandible of female. 4) 14.64% of the mandibular films showed the deviation of the inferior alveolar canals, and 12.20% of them showed that of the mental foramina. 5) 6 cases of cysts relevant with the impacted teeth were discovered among the 83 cases of male and 5 cases discovered among 72 cases of female.