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A new plaster
220
ORTHODONTIC
ABSTRACTS
AND
REVIEWS
These observationi are most interesting and enlightening. They should prove helpful to the oral surgeon in the management of fractures. T. K&et&y.
A New Plaster:
Science 93 : 19 (Feb. al),
1941.
Though chemically the same as plaster of Paris, a new gypsum plaster, described at the meeting of the American Institute of Chemical Engineers, is about twice as strong as the old-fashioned article. In fact, it approaches Portland cement in strength. The new product was announced by E. P. Schoch and William A. Cunningham, of the University of Texas. It is prepared by heating gypsum in a magnesium sulfate solution, whereas plaster of Paris and ordinary wall plaster are made by the dry calcination or burning of gypsum. Experiments in a small pilot plant indicate, they stated, that it can be made at a cost of $8.82 per ton, a figure that may be reduced by large-scale production. Probably the magnesium sulfate plaster will find its chief application in wall board, tile and other factory cast products.
Rumination
as a Cause of Perimylolysis:
Scaadinavic~a
By Finn Lange, Acta Odontologica
2 : November, No. 2, 1940.
A case is reported in which the crowns of the maxillary teeth have undergone chemical abrasion on the lingual and occlusal surfaces. The patient has developed the habit of regurgitating his food and pressing it with his tongue against these tooth surfaces. During the sour eructations the pH of the saliva is reduced from 7.2 to 3.7 which rises in twenty minutes to 6.3. The surfaces affected are smooth and therefore the process cannot be purely chemical. With these facts in mind the author concludes that the degenerative process is caused partly by a chemical process clue to acid eructations and partly by a mechanical process involving motions of the tongue. L. L. Taft, D.D.S.
The Psychology
of Nervous Habits:
Record 60: 439, November,
By Rachel Sclare, L.D.S.
(Leeds),
Dent.
1940.
Most of our patients are laboring under some emotional stress when they come to us for treatment, and in endeavoring to inspire confidence and so carry out the necessary treatment successfully, the dentist is unconsciously practicing psychology. Thumb-sucking along with other habits such as stuttering, nail-biting, and enuresis are classed as nervous habits, and are all symptoms of an emotional state ; they are the malresponses to emotional situations, based on conditions of XlXid~, insecurity, inferiority, and tension. It is therefore necessary to consider the child’s environment, his relation to his parents, his brothers and sisters, and other persons in the house, and the parents ’ attitude toward each other and to the child. If unity between the
ORTHODONTIC
ABSTRACTS
AND
REVIEWS
These observationi are most interesting and enlightening. They should prove helpful to the oral surgeon in the management of fractures. T. K&et&y.
A New Plaster:
Science 93 : 19 (Feb. al),
1941.
Though chemically the same as plaster of Paris, a new gypsum plaster, described at the meeting of the American Institute of Chemical Engineers, is about twice as strong as the old-fashioned article. In fact, it approaches Portland cement in strength. The new product was announced by E. P. Schoch and William A. Cunningham, of the University of Texas. It is prepared by heating gypsum in a magnesium sulfate solution, whereas plaster of Paris and ordinary wall plaster are made by the dry calcination or burning of gypsum. Experiments in a small pilot plant indicate, they stated, that it can be made at a cost of $8.82 per ton, a figure that may be reduced by large-scale production. Probably the magnesium sulfate plaster will find its chief application in wall board, tile and other factory cast products.
Rumination
as a Cause of Perimylolysis:
Scaadinavic~a
By Finn Lange, Acta Odontologica
2 : November, No. 2, 1940.
A case is reported in which the crowns of the maxillary teeth have undergone chemical abrasion on the lingual and occlusal surfaces. The patient has developed the habit of regurgitating his food and pressing it with his tongue against these tooth surfaces. During the sour eructations the pH of the saliva is reduced from 7.2 to 3.7 which rises in twenty minutes to 6.3. The surfaces affected are smooth and therefore the process cannot be purely chemical. With these facts in mind the author concludes that the degenerative process is caused partly by a chemical process clue to acid eructations and partly by a mechanical process involving motions of the tongue. L. L. Taft, D.D.S.
The Psychology
of Nervous Habits:
Record 60: 439, November,
By Rachel Sclare, L.D.S.
(Leeds),
Dent.
1940.
Most of our patients are laboring under some emotional stress when they come to us for treatment, and in endeavoring to inspire confidence and so carry out the necessary treatment successfully, the dentist is unconsciously practicing psychology. Thumb-sucking along with other habits such as stuttering, nail-biting, and enuresis are classed as nervous habits, and are all symptoms of an emotional state ; they are the malresponses to emotional situations, based on conditions of XlXid~, insecurity, inferiority, and tension. It is therefore necessary to consider the child’s environment, his relation to his parents, his brothers and sisters, and other persons in the house, and the parents ’ attitude toward each other and to the child. If unity between the