Page 170 - My FlipBook

2

144 THE MICRO-ORGANISMS OF THE HUMAN MOUTH.

IX.
Weight Loss in Compaki-
Substance. Solution, Time. Suspended by
IS Mgs. i Weight. son.
1. Ivory 201.5 Uydrocbloric' One week
j Gold wire 53.3 53.3
acid, 3o '
1
percent, j
"
2. Hydrochloric " Silk thread 54.0 8.9
acid, /-o 1
per cent. '
1. Ivory 201.5 Sulphuric One week Gold 7.5 7.5
acid, 2
I
I per cent.
" Amalgam
2. Sulphuric 7.3 5.0
acid. 2
j
per cent.
I
"
3. Suli)huric Tin 6.3 3.7
acid.
I
per cent.
"
4. Sulphuric Zinc-oxychloride 6.5 0.0
acid, 2
I per cent.
XIII.
1. Ivory 195.6 Lemon-juice One week Gold G8.0 6.80
"
2. Amalgam 68.5 45,3
"
3. " |Tin . 69.0 34.0
4. Zinc-oxychloride 1 70.4 1 0.0
XV,
1. Dentine from 88.4 Acetic acid, Two weeks Gold 13.5 13.5
human tooth 20 per ct.
2. Dentine from Acetic acid, Zinc-oxychloride 14.9 0.0
human tooth 20 per ct.
XVII.
1. Dentine from 70.9 Lemon-juice Six days Gold 49.6 49.6
human tooth
2. Deintine from Zinc-oxychloride 48.6 0.0
human tooth
|
XIX.
1. A sound bi- i 885.0 Acetic acid, Three w'ks Gold 79.0 79.0
cuspid dilute
2. A sound bi- 875 Acetic acid, Zinc-oxychloride 82.0 0.0
cuspid dilute
Diverse Causes of Caries.
Mechanical injuries, particularly such as are caused by sharp
or rough particles of food (splinters of hone), sharp tooth-powders,
sudden changes of temperature, climatic influences, humidity
of the air, use of tobacco, medicines, mineral waters, mercury,
mental exertion, the quality of the food, erosions, " salty,
acid, pointed or rough particles which irritate the very delicate
membranes of the alveoli or the nerve-filaments," etc., are men-
tioned by many as the cause of toothache.