In vitro evaluation of different remineralization periods in improving the resistance of previously eroded bovine dentine against tooth-brushing abrasion.
One dentine specimen was prepared from each of 90 bovine incisors. The samples were then evenly distributed among nine groups (A-I) and submitted to 10 alternating de- and re-mineralization cycles, including abrasion by tooth brushing. Each cycle started with a demineralization using the erosive soft drink Sprite Light for 1 min, followed by storing the samples in pooled human saliva for a total of 240 min. The specimens were removed from the saliva at different intervals (group A, 0 min; B, 15 min; C, 30 min; D, 45 min; E, 60 min; F, 90 min; G, 120 min) and brushed in an automatic brushing machine. Groups H (erosion, but no brushing) and I (no erosion, but brushing), which were also stored in saliva for 240 min, served as controls. After these cycles, loss of dentine was determined by profilometry, producing the following values (mean+/-S.D.), which were analysed statistically (P< or = 0.05): group A (5.03+/-1.49 microm), B (4.44+/-1.09 microm), C (4.91+/-0.95 microm), D (5.47+/-1.52 microm), E (5.29+/-1.45 microm), F (4.76+/-0.74 microm), G (5.16+/-0.71 microm), H (2.61+/-1.31), I (1.11+/-0.39). Groups A-G had no significant differences, but they showed a significantly greater loss of dentine than groups H and I. It is concluded that the abrasion resistance of eroded bovine dentine is still decreased after a remineralization period of 120 min.
Attin
T
T
Department of Operative Dentistry and Preventive Dentistry, University of Göttingen Georg-August-Universität Göttingen, Robert-Koch-Str. 42, D-37075, Gottingen, Germany. thomas.attin@med.uni-goettingen.de
Buchalla
W
W
Putz
B
B
D000704:Analysis of Variance; D000818:Animals; D002253:Carbonated Beverages / Q000009:adverse effects; D002417:Cattle; D003804:Dentin / Q000473:pathology*; D006801:Humans; D013997:Time Factors; D014072:Tooth Abrasion / Q000209:etiology / Q000517:prevention & control*; D014077:Tooth Erosion / Q000150:complications* / Q000209:etiology; D014089:Tooth Remineralization; D014099:Toothbrushing / Q000009:adverse effects*