There often occurs an antro-oral fistula after extraction of the upper molar tooth. When the maxillary sinus is normal, nearly all of the extraction wounds will heal by a routine post-exodontic treatment. However, when the maxillary sinus is infected unfortunately systemic and local chemotherapy with antibiotics should be instituted immediately and it is convenient to use a partial denture devised by the authors in the extraction wound. The treatment of the fistula formed in case of removing the tooth causing the maxillary sinusitis is acute or chronic. If it is of the chronic type of several months or more, the fistula will not close unless a radical operation is performed.
When the patient already has a chronic sinusitis it is idealistic to perform the radical operation for sinusitis and the operation for closure of the fistula simultaneously.
If can be considered from the authors' experience that an antro-oral fistula occurs in the order of first molar, second molar and second bicuspid.

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Various kinds of prosthetic restorations applied to the patients in our clinic since April of 1948 to March 1951 were statistically summarized and compared with those in the 1932-1941 and the 1945-1947 periods for the purpose of observing a current tendency in prosthetic dentistry in the post-war period.
1. Post-crown, crown, and bridge-work showed a decrease in percentage of about 3/5, 2/3 and 2/3 respectively, which were less than in the pre-war 1932-1941 period and more than in the 1945-1947 period.
This may be considered to depend upon the fact that precious metal has come to be obtained easily and resin has prevailed, as the financial condition recovers.
2. Full denture showed an increase in percentage in comparison with that in both. previous periods.
3. Partial denture also showed more increase in percentage than in the 1932-19411 period, but more decrease in the 1945-1947 period.
This may be due to the fact that the denture of a small type with one artificial tooth have predominated over the bridge work.

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1. Generally speaking the rubbing is an indispensable factor to cause a so-called cuneiform defect. This defect occuring on the enamel, however, is caused not only by rubbing but by acquired decalcification, process of dental caries and congenital reduction of resistance, such as less calcification. On the other hand, that on the cervical area is mainly due to rubbing and decalcification by acid or dental caries plays a smaller part in this case.
2. Principal cause of the cuneiform defect is the use of tooth-bruch and tooth-powder, especially being concerned in the quality of the latter.
3. So-called cuneiform defect occurs by all sorts of movement of tooth-brush, such as vertical, horizontal and round movement, but above all the effect of horizontal movement is important.
4. Furthermore it can be noticed by the other causes: fingertip and tooth-powder, salt, toothpick, the margin of dental plate, clasp of dental plate, raw vegetables, fruits, and all kinds of thread.
5. The degree and the form of so-called cuneiform defect have some connection with force, direction and working period of rubbing, quantity of applied tooth-powder, size and strength of the brush, width of the exposed root surface, hardness of the tooth-root and speed of the gingival atrophy.

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All of the cases presented could be considered to have developed from the mucosa of alveolar recessus at the bottom of the antrum which had been left behind in case of Caldwell-Luc's operation.
In the well-developed antrum the mucosa of alveolar recessus may be liable to be left behing and to cause a cyst in the future.
Attention should be paid to differentiate the other kinds of cyst of dental origin which bear some resemblance of the symptom to postoperative maxillary cyst.

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A girl, aged 11 years and 11 months, who suffered from class II, division I after -Angle's classification, accompanying very deep overbite, was treated successfully by means of F. J. O. method with in a comparatively short period.

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A 43 year-old man visited us with a complaint of uncomfortable feeling in the area of the lower molar region. Later vesicules of hemp-seed to rice-grain size were formed over the mucosa of the left lip and cheek and their neighboring gingiva, and, in addition, on the auricula and external auditory canal.
Pain was noticed only on the area distributed by the second and third branches of the left trigeminal nerve. The trouble was cured by pumping treatment and application of the aureomycin ointment.

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A 22-year-old woman is presented, showing the lobulated and uneven-surfaced hypertrophy of the gum in the area of left molars to anterior teeth of both maxilla and mandible. She complains that it has begun to swell since five or six years old and has increased its size rapidly in the age of seventeen to eighteen with frequent recurrences. It may be caused by congenital predisposition and endocrinal disturbance

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A 19-year-old girl with a large cavernous hemangioma in the mental region is presented. Bilateral facial and mental arteries were ligated for the purpose of restricting the blood supply to the tumor, to which a radium irrdadiation was performed. As the tumor considerably decreased its size two months later, exstirpation was done with successful results, being associated with transfusion of blood and a large qauntity of Ringer's solution.

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