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An in situ model to study the toothpaste abrasion of enamel
Author(s) -
Joiner Andrew,
Pickles Matthew J.,
Tanner Carolyn,
Weader Elizabeth,
Doyle Peter
Publication year - 2004
Publication title -
journal of clinical periodontology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.456
H-Index - 151
eISSN - 1600-051X
pISSN - 0303-6979
DOI - 10.1111/j.1600-051x.2004.00497.x
Subject(s) - toothpaste , enamel paint , abrasion (mechanical) , dentistry , in situ , materials science , orthodontics , medicine , composite material , chemistry , organic chemistry
Objectives: In order to understand the clinical relevance of dentifrice abrasivity on the dentition in vivo, an in situ enamel wear model has been developed. Materials and Methods: Polished human enamel blocks were indented with a Knoop diamond, attached to dentures and worn by adult volunteers for 24 h per day. The blocks were brushed for 30 s, twice per day with dentifrices of known relative dentine abrasivity (RDA) and relative enamel abrasivity (REA). The dentifrices used were either dentifrice A (RDA=85, REA=3.4), dentifrice B (RDA=189, REA=2.0) or dentifrice C (RDA=132, REA=42.7). After 28 days, the blocks were removed and the geometry of each Knoop indent was remeasured. From the baseline and post‐treatment values of indent length, the amount of enamel wear was calculated from the change in the indent depth. Results: The median values for enamel wear of dentifrices A, B and C were −0.02, 0.01 and −0.48 μ m, respectively. The differences between dentifrice C and dentifrices A and B were of statistical significance. Conclusion: This study has demonstrated the usefulness of an in situ technique for investigating the relationship between the abrasivity of a dentifrice in vitro and the wear of enamel in situ.