The ability of fruit teas to remove the smear layer: an in vitro study of tubule patency.
OBJECTIVE
Fruit teas are know to have an erosive effect on enamel, but the effects on dentine are unknown. Lesions of dentine hypersensitivity have numerous patent dentinal tubules and the aim of this paper was to examine the ability of various fruit teas to remove the smear layer.


METHODS
The erosive potential of a variety of fruit teas was assessed in the laboratory by measuring their pH and neutralisable acidity. Smeared dentine specimens were prepared from extracted teeth and the ability of each tea to remove the smear layer was assessed by measuring the diameter and area of the opened tubules and counting the number of patent tubules seen in a unit area using scanning electron microscopy. A 0.2% citric acid solution was used as a positive control.


RESULTS
The pH of the fruit teas ranged from 2.98 to 3.95 and the neutralisable acidity ranged from 10.63 to 33.0 ml of 0.1 M NaOH. All the fruit teas tested were able to remove the smear layer. The mean diameter of the tubules ranged from 0.61 to 1.14 microm and the mean area ranged from 0.31 to 1.03 microm2. The number of patent tubules per specimen ranged from 13 to 121.


CONCLUSIONS
All the fruit teas tested were found to be highly acidic and able to remove the smear layer.
Rees
Jeremy S
JS
Adult Dental Health Department, Dental School, Wales College of Medicine, Heath Park, Cardiff, CF14 4XY, UK. reesjs1@cardiff.ac.uk
Loyn
T
T
Rowe
W
W
Kunst
Q
Q
McAndrew
R
R
D003743:Dental Enamel / Q000187:drug effects* / Q000648:ultrastructure; D003804:Dentin / Q000187:drug effects* / Q000648:ultrastructure; D005638:Fruit / Q000009:adverse effects* / Q000737:chemistry; D006801:Humans; D006863:Hydrogen-Ion Concentration; D016369:Smear Layer; D013662:Tea / Q000009:adverse effects* / Q000737:chemistry; D014077:Tooth Erosion / Q000139:chemically induced
D013662:Tea