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Studies of the Hydrogen Ion Concentration in the Mouth. II. The Effects of Rinsing and of Beverages on Hydrogen Ion Concentration
Abstracts of Current ORAL
Literature PATHOLOGY
The Temporomandibular Joint and Orthodontic and Prosthetic New Zealand Dent. J. 53: 78-86, April, 1957.
Occlusion.
F. W. Craddock
Craddock ventures the opinion that retroposed condyles are not only rare, but also are often symptomless, and that pain and dysfunction in the temporomandibular joint are most commonly to be found in those patients in whom there exists a wide disparity between occlusal and resting mandibular position because in rest the condylen are tot far forward. Further, he does not recall an instance of temporornantlibular arthrosis of dental origin in a patient having an extreme (Ilass III malocclusion and prognathic faciai profile. He believes it to be significant that these patients never make protrusive move ments during mastication, that they always chew with the mandible retrudetl as far il: possible, and that lateral movements are often limited in extent. Hence, translator? movements of their condylen are relatively infrequent anI1 of small magnitutle~ anal there is consequently an absence of what might l)e ~lescribed as a pumping or piston action of condyles in their fossae. If these observations are correct, it follows that orthodontists render a preventive service to which they have so far made little claim, namely, that by reducing translatorp movement of the condyles in the course of treating certain Class II malocclusions in ehildren, they do something to ensure freedom from articular tlysfunction in allolescents am1 adults. A. J. A.
ORAL
MEDICINE
Studies of the Hydrogen Ion Concentration in the Mouth. II. The Effects of Rinsing and of Beverages on Hydrogen Ion Concentration. II. R. Sullivan, D.D.Sc. (Syd.), G. Charlton, M.D.S., and Dymphna Lennon, BSc., A.I.D. Australian Dent. J. 2: 42-45, February,
1957.
The micro-glass etectrode was user1 to bonated beverage on the pH values of various tions were made: (1)
(2) (3) (4)
(5)
measure areas
the efrects of the mouth.
of
water uncl The following
of
a car-
observa-
Although the pH of carious lesions was measuretl some consillerahle t imc after any of the patients had ingestetl footl, their pH still rrmaine.1 sufficiently low to cause decalcification. The pH of the carious lesions was urlaffec*tetl by rinsing the mouth wit11 water. The paroticl saliva became more acitl after rinsing the mouth with water. The use of an acidulated beverage caused a drop in the pH of all areas in the mouth. However, this was particularly noticeable in carious lesions where the hydrogen ion concentration was well below the pH usuall>con sidered as critical for decalcification. The parotid saliva rapidly becomes alkaline after a rinse with an acitlulate(l ljeverage, but this seems to have little effect on the pH of carious lesions. A. J. 1238
A.
Literature PATHOLOGY
The Temporomandibular Joint and Orthodontic and Prosthetic New Zealand Dent. J. 53: 78-86, April, 1957.
Occlusion.
F. W. Craddock
Craddock ventures the opinion that retroposed condyles are not only rare, but also are often symptomless, and that pain and dysfunction in the temporomandibular joint are most commonly to be found in those patients in whom there exists a wide disparity between occlusal and resting mandibular position because in rest the condylen are tot far forward. Further, he does not recall an instance of temporornantlibular arthrosis of dental origin in a patient having an extreme (Ilass III malocclusion and prognathic faciai profile. He believes it to be significant that these patients never make protrusive move ments during mastication, that they always chew with the mandible retrudetl as far il: possible, and that lateral movements are often limited in extent. Hence, translator? movements of their condylen are relatively infrequent anI1 of small magnitutle~ anal there is consequently an absence of what might l)e ~lescribed as a pumping or piston action of condyles in their fossae. If these observations are correct, it follows that orthodontists render a preventive service to which they have so far made little claim, namely, that by reducing translatorp movement of the condyles in the course of treating certain Class II malocclusions in ehildren, they do something to ensure freedom from articular tlysfunction in allolescents am1 adults. A. J. A.
ORAL
MEDICINE
Studies of the Hydrogen Ion Concentration in the Mouth. II. The Effects of Rinsing and of Beverages on Hydrogen Ion Concentration. II. R. Sullivan, D.D.Sc. (Syd.), G. Charlton, M.D.S., and Dymphna Lennon, BSc., A.I.D. Australian Dent. J. 2: 42-45, February,
1957.
The micro-glass etectrode was user1 to bonated beverage on the pH values of various tions were made: (1)
(2) (3) (4)
(5)
measure areas
the efrects of the mouth.
of
water uncl The following
of
a car-
observa-
Although the pH of carious lesions was measuretl some consillerahle t imc after any of the patients had ingestetl footl, their pH still rrmaine.1 sufficiently low to cause decalcification. The pH of the carious lesions was urlaffec*tetl by rinsing the mouth wit11 water. The paroticl saliva became more acitl after rinsing the mouth with water. The use of an acidulated beverage caused a drop in the pH of all areas in the mouth. However, this was particularly noticeable in carious lesions where the hydrogen ion concentration was well below the pH usuall>con sidered as critical for decalcification. The parotid saliva rapidly becomes alkaline after a rinse with an acitlulate(l ljeverage, but this seems to have little effect on the pH of carious lesions. A. J. 1238
A.