In general, improvement of diagnosis depend on the precise judgement of many diag-nostic informations gathered by the medical examinations for a patient and the knowledgeof a doctor.
In such a diagnostic process, psychological behavior of a doctor takes an importantpart. However it may be quite difficult to extract and evaluate psychological works of adoctor objectively.
Various ideas have been proposed for establishing a criteria of judgement on diagnosisand for improving the treatment planning in modern dentistry.
In present study, authors attempt was to introduce the eye-mark recording system tothe radiographic interpretation, and special attention was payed for the objective evaluationof the visual action of the doctors on their interpretation of orthopantomograms.
We reached to conclusion from present study was as follows, namely eye-mark recordingsystem may be very useful for assessment of psychological works in their diagnosticprocess and actually it was possible to find out the subjective considerations and or psychologicalbehavior of doctors during their orthopantomographic interpretation.

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In the previous investigations regarding roentgenographic appearance of artificiallycreated lesion in bone, it cannot be detected on the intraoral roentgenogam if it was confinedwithin cancellous bone. The purpose of this study was to confirm the previous studies byusing human dry mandibular bone and to investigate what other specific condition affectedthe image formation of bone lesion on dental radiographic film besides the size and locationby using fresh cow bone.
As results;
1. Bone lesion could not be detected on dental roentgenogram if there waswithin cancellous bone. The bony lesions must involve the outer or innerbone cortex before they are detectable radiographically.
2. The image formation of lesions created in fresh cow bone varied by itscontents. If the contents of the lesion was fat or water, their radiographicimage revealed less clear than the content of air.
3. Bone lesion which was not detected radiographically could be identified byadding different substance to surrounding cancellous bone.

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A few experiments were performed on the daily operation and maintenance of automaticdental film processor Profexray model P 4 (Litton).
Especially, in the experiments on the constancy of the developing agent we tried tofind a reasonable replenishment method.
And, we discussed some problems on the operation and maintenance of the dentalautomatic film processors.

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The problems connected with the development and growth of man constitute a veryimportant research subject not only in the realm of medicine, but also in that of dentistry.
In particular, the craniofacial growth has very vital bearings on various functions and features, and an adequate predication of the craniofacial growth furnishes a valuable diagnosticinformation for the orthodontic and pedodontic specialists.
In 1969, the authors successfully developed an automatic analytical system of the roentgencephalograms by an application of specturum electroic computer and its peripheralequipments. By this system, it is possible to select various measurement points throughvisual confirmation and analyze automatically the profilograms thus obtained.
In the present study, this automatic analytical system was appled to 30 specific individualsin an effort to ascertain whether or not it would be possible to predict from theirserial cephalograms the expected values for the lateral contours of the face at the age of 17. For prescribed purposes, changes revealed in 6 cephalograms, taken of an individual for 6 consecutive years, were utilized as serial data and as the basis for a predicition of thecraniofacial contour at the age of 17.
The following salient findings were obtained:
1. Serial profilograms, covering he ages from 6 to 11years, revealed an averagegrowth pattern in the craniofacial region. Linear regression analysis was applied to themeasurement of the annual growth changes to obtain the linear gradients of male and femalewhich were the mean directional coefficients.
This concept was applied to all the individuals under study and it was possible topredict the future growth pattern on a single cephalogram.
2. Serial data, taken from subjects of 6 to 11years, were used to derive the linearregression. By extending this line, it proved possible to plot predictive profilograms at theage of 17.
3. The orbits of measurement points incidental to the growth were classified into fourtypes i) straight type, ii) vacillatory type, iii) semillunar type, and iv) sigmoid type.
4. The directional coefficients obtained from the linear regression were classified as i) inferior front, and ii) bi-directional type.
5. In the relationship of the body to craniofacial region, were observed in whichthe girdle of chest exceeded the setting height in subjectes over 12years old. With thesecases, it was observed that the craniofacial growth assumed an inferior front directionand at the same time the growth orbit belonged to sigmoid type, as classified above.
6. Agreement between the expected and actual values was nearly 70%. This is basedon data in which the growth measurement at age 15 was found to be on the linear regressionin 12 out of 17cases.
Moreover, 9 of the cases were within the range of expected from the mean growthrate.

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A case in which the patient accidentally swallowed a piece of hand remer duringdental practice was presented in this repot. The patient is young man, 18 years old, whohas been under endodontic dental practice for the left mandibular first molar. The swallowedreamer was revealled to remain in the stomach by the abdominal X-ray examination, especially in the pylours during five days, and was excreted out from his body after additionalthree days in the intestine. The reamer was carefully traced by contrastradiography of the stomach and the intestine throughout the course during eight days.

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