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J Dent Res 29(4): 436-439, 1950
© 1950 International and American Associations for Dental Research
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BACTERIAL GROWTH AND CRYSTAL FORMATION: A POSSIBLE FACTOR IN CALCULUS FORMATION

HENRY A. BARTELS B.S., D.D.S.1

1 Department of Pathology, College of Physicians and Surgeons, School of Dental and Oral Surgery, Columbia University, New York, N. Y.

The production of ammonium magnesium phosphate crystals about colonies of oral actinomycetes has been observed. Crystal formation resulted from an increase in alkalinity caused by decomposition of protein with liberation of ammonia which combined with the magnesium and phosphate components of the medium. This phenomenon is mentioned as a further corroboration of Naeslund's theory of salivary calculus formation.

Submitted on March 7, 1950






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