Bonding to ground versus unground enamel in fluorosed teeth.
OBJECTIVE
To determine the effect of grinding on the bonding effectiveness of a self-etch and an etch-and-rinse adhesive to fluorosed enamel.


METHODS
The teeth were classified using the Thylstrup and Fejerskov index (TFI). Fluorosed teeth (TFI=5) obtained from Isparta (Turkey) and control teeth (TFI=0) obtained from Leuven (Belgium) were used. Using a depth-marking diamond bur, 0.3mm of enamel was removed from mid-buccal and mid-palatal/lingual surfaces of the teeth, whereas the area adjacent to the ground area was left unprepared. A two-step self-etch (Clearfil Protect Bond, Kuraray) and a three-step etch-and-rinse adhesive (Optibond FL, Kerr) were used to bond the resin composite to the ground and unground enamel. Rectangular micro-specimens were prepared using the slow-speed diamond saw and tested in tensile to determine the micro-tensile bond strength (microTBS).


RESULTS
The microTBS to unground fluorosed enamel was significantly lower than to ground fluorosed enamel for Clearfil Protect Bond (15.8+/-15.2 and 45.0+/-12.4MPa, p<0.0001) and for Optibond FL (35.5+/-21.4 and 50.5+/-12.3MPa, p<0.05), respectively. In control teeth, Clearfil Protect Bond bonded better to ground enamel (p<0.01), whereas OptiBond FL exhibited a similar bonding effectiveness to ground and unground enamel (p=0.0634).


CONCLUSIONS
Preparation of enamel improved the resin-enamel bond strength in fluorosed teeth. The bonding effectiveness to unground enamel was lower in fluorosed teeth than in control teeth for the self-etch adhesive tested.
Ermis
R Banu
RB
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Kapucijnenvoer 7, B-3000 Leuven, Belgium.
De Munck
Jan
J
Cardoso
Marcio Vivan
MV
Coutinho
Eduardo
E
Van Landuyt
Kirsten L
KL
Poitevin
André
A
Lambrechts
Paul
P
Van Meerbeek
Bart
B
D000269:Adhesives / Q000737:chemistry; D000704:Analysis of Variance; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel / Q000002:abnormalities / Q000737:chemistry*; D045662:Dental Etching / Q000379:methods; D009050:Fluorosis, Dental; D006801:Humans; D013718:Tensile Strength
D000269:Adhesives