The author already published his exact statistical observation on carious teeth of lepers in No.4, Vol.1 of the journal "Rai". In the present paper he mention his views on the pyorrhoea alveolaris which has a close connection with constitutional diseases. The author made a statistical observation clinically in 336 cases of alveolaris of lepers, who were elder than 16 year old (♂208. ♀128) and a bacteriological study in 64 cases, and came to the following conclusions. (1) The morbidity of pyorrhea alveolaris in lepers (over 16 years old) is 61.3%. (2) The morbidity of pyorrhoea alveolaris is 72.6% in lepra tuberosa and 47.71% in lepra nervosa. So it should be extremely higher in lepra tuberosa than in lepra nervosa. This proportion is greatly different from that of the carious teeth, so that the morbidity of carious teeth is lower in lepra tuberosa than in lepra nervosa. (3) Pyorrhoea alveolaris developes generally in youth and increses in proportion to the age, reaching the highest (76%) in their forties. This fact is similar to that of pulmonary phthisis. (4) Even within three years after the onset of leprosy, the morbidity of pyorrhoea alveolaris comes higher up to 56.25% in lepra tuberosa, and to 10% in lepra nervosa. It is wonderful that lepra tuberosa has a close connection with pyorrhoea alveolaris. (5) The morbidity of pyorrhoea alveolaris increases gradually with the lapse of time after the onset of leprosy. (6) The site, in which highest morbidity of pyorrhoea alveolaris is observed, is in the lower front teeth, and then the upper molars and the upper front teeth, finally the lower molars. This generally correspondens to the order of the cumulus of fartar, and there is no peculiar portion which is different from cases of the normal person. (7) No leprous bacillus is found in the pus of pyorrhoea alveolaris and so it should be not right to call it "leprous pyorrhoea alveolaris." (8) A majority bacteria in the pus of pyorrhoea alveoaris is coccus. But generally sorts of germs are silmilar to those of normal persons and there is no peculiar point. (9) As stated above pyorrhoea alveolaris is surely more frequently seen in lepers. It is considered appropriate to the fall of resisting power of the body. (10) Consequently it is perceived that there is a very important relation between so-called pyorrhoea alveolaris and the constitutional disease or disoder.

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著者ハ人類齒牙及ビ犬ノ齒牙ニツキ實驗的ニ齒根端切除手術ヲ行ヒ、手術後一ケ月毎ニ臨床的、X線學的及ピ組織學的ニ手術創竈ノ治癒過程ヲ檢索シ、多クハ手術後三乃至五ケ月ニシテ臨床的ニ骨植堅固、無反應性治癒、X線學的及ピ組織學的ニ骨性治癒、正常齒根膜形成ニ達スル所見ヲ得タリ。又根端病竈ヲ有スル感染根管齒牙及ピ生活齒牙上ノ手術創竈治癒過程ヲ比較研究シタルニ、後者ハ毎例良好ナル治癒經過ヲトリタリ、コレニ反シテ前者中ニハ治癒経過良好ナラズ根端部ニ限局性肉芽竈又ハ細胞浸潤竈殘留スルヲ鏡見セリ。是等ノ例ニ於テモ同一實驗齒牙ニテ切除手術セザル他齒根端部ニテハ顯著ナル周圍齒槽骨壁破壊ヲ伴ヒ膿瘍竈ヲ形成セル興味アル對照所見ヲ現ハセリ。切除齒根端齒質ノ吸収窩ハ全面的ニ新生骨性白堊質ニテ補填セラル、ニ「ガツタパーチャー、ヨードフオルム、セメント」根管充填材表面ニハ新生骨性白堊質添加ナク無反應結締織性包圍治癒セリ。

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著者ハ昭和七年七月以降「鼠癩ノ齒牙ニ就テ」ノ研究ニ手ヲ染メ(1)鼠癩ノ齒牙ノ形態學的研究(2)鼠癩ノ齒牙ノ組織學竝ニ細菌學的所見(3)鼠癩ノ齒牙ノ實驗的研究ニ分割シテ論述スルコトニセリ。而シテ更ニ(1)ヲ二編ニ分チ、第一編 ドブ鼠ノ齒牙ノ形態學的研究ニ於テ健常ドブ鼠ノ齒牙形態ノ測計價ヲ決定シ 第二編 鼠癩ノ齒牙ノ形態學的所見ニ於テ癩罹患鼠ノ齒牙ノ形態ノ測計價ヲ檢出シテ、更ニ第一編ヲ基礎トシ両者ノ比較ヲ試ミ之ニ對シ聊カ自家ノ考按ヲ附スルコト、セリ。蓋シ著者ノ檢査材料タリシ癩罹患鼠ハ總テ成熟ドブ鼠Mus decumanusナリシカバナリ。而シテ本編ニ於テハ幼若、成熟ニ二別シテドブ鼠齒牙ノ形態上ノ計數ヲ定メ併テ性別ノ差異及ビ増齢的變化ヲ知リ得タリ。尚ホ齒根組列ヲ檢シ以テ齒牙發達ノ程度ヲ覗ヒドブ鼠ノ動物學上ノ分化的位置決定ノ参考トナルベキー端ニモ觸レタリ。

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