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Critical Reviews in Oral Biology & Medicine
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13(5):426-441 (2002)     Crit Rev Oral Biol Med
© 2002 International and American Associations for Dental Research

SUPRAGINGIVAL CALCULUS: FORMATION AND CONTROL

Ye Jin and Hak-Kong Yip*

Graduate Student, Faculty of Dentistry, the University of Hong Kong, Hong Kong;
* Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, PPDH 1A23, 34 Hospital Road, Hong Kong, P.R. China

Correspondence: * corresponding author, hkyip{at}hkusua.hku.hk

Dental calculus is composed of inorganic components and organic matrix. Brushite, dicalcium phosphate dihydrate, octacalcium phosphate, hydroxyapatite, and whitlockite form the mineral part of dental calculus. Salivary proteins selectively adsorb on the tooth surface to form an acquired pellicle. It is followed by the adherence of various oral micro-organisms. Fimbriae, flagella, and some other surface proteins are essential for microbial adherence. Microbial co-aggregation and co-adhesion enable some micro-organisms, which are incapable of adhering, to adhere to the pellicle-coated tooth surface. Once organisms attach to the tooth surface, new genes could be expressed so that mature dental plaque can form and biofilm bacteria assume increased resistance to antimicrobial agents. Supersaturation of saliva and plaque fluid with respect to calcium phosphates is the driving force for plaque mineralization. Both salivary flow rate and plaque pH appear to influence the saturation degree of calcium phosphates. Acidic phospholipids and specific proteolipids present in cell membranes play a key role in microbial mineralization. The roles of crystal growth inhibitors, promoters, and organic acids in calculus formation are discussed. Application of biofilm culture systems in plaque mineralization is concisely reviewed. Anti-calculus agents used—centering on triclosan plus polyvinyl methyl ether/maleic acid copolymer, pyrophosphate plus polyvinyl methyl ether/maleic acid copolymer, and zinc ion—in commercial dentifrices are also discussed in this paper.

Key Words: Dental calculus • plaque mineralization • microbial mineralization • organic acid • anti-calculus agent

Critical Reviews in Oral Biology & Medicine, Vol. 13, No. 5, 426-441 (2002)
DOI: 10.1177/154411130201300506
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