Microleakage of orthodontic band cement at the cement-enamel and cement-band interfaces.
BACKGROUND
Our objective was to determine and compare microleakage patterns of conventional glass ionomer cement (GIC), resin modified GIC (RMGIC), and polyacid-modified composite for band cementation.


METHODS
Sixty freshly extracted third molars were randomly divided into 3 groups of 20 teeth each. Microetched molar bands in the 3 groups were cemented to enamel with one of three orthodontic cements: Ketac-Cem (3M ESPE, Gmbh, Seefeld, Germany), Multi-Cure (3M Unitek, Monrovia, Calif), and Transbond Plus (3M Unitek). A dye penetration method was used for microleakage evaluation. Microleakage was determined by a stereomicroscope for the cement-band and cement-enamel interfaces from both the buccal and lingual margins. Statistical analysis was performed with Kruskal-Wallis and Mann-Whitney U tests.


RESULTS
The buccal sides had similar microleakage values compared with the lingual sides for the cement-enamel and cement-band interfaces with all cements. Statistical comparisons showed statistically significant differences among the band cements between both interfaces (P <0.001). When the cement systems were compared, conventional GIC showed the highest leakage scores between cement-band (median, 3.50 mm) and cement-enamel (median, 2.88 mm) interfaces. Teeth banded with RMGIC and modified composite showed similar microleakage scores, and both had less leakage (<1 mm) than conventional GIC.


CONCLUSIONS
Conventional GIC is associated with more microleakage than RMGIC and modified composite at both the cement-band and cement-enamel interfaces.
Uysal
Tancan
T
Department of Orthodontics, Faculty of Dentistry, Erciyes University, Kayseri, Turkey. tancanuysal@yahoo.com
Ramoglu
Sabri Ilhan
SI
Ertas
Huseyin
H
Ulker
Mustafa
M
D004396:Coloring Agents; D020770:Compomers / Q000737:chemistry; D003738:Dental Cements / Q000737:chemistry*; D003743:Dental Enamel / Q000648:ultrastructure*; D003763:Dental Leakage / Q000145:classification*; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008277:Magnesium Oxide / Q000737:chemistry; D008422:Materials Testing; D008964:Molar, Third; D016910:Orthodontic Brackets; D011076:Polycarboxylate Cement / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D012394:Rosaniline Dyes; D013499:Surface Properties; D019228:Tooth Crown / Q000648:ultrastructure; D015034:Zinc Oxide / Q000737:chemistry
D004396:Coloring Agents; D020770:Compomers; D003738:Dental Cements; D005899:Glass Ionomer Cements; C516145:Multicure cement; D011076:Polycarboxylate Cement; D019279:Resin Cements; D012394:Rosaniline Dyes; C429625:Transbond Plus Self-Etching Primer; D008277:Magnesium Oxide; C025485:basic fuchsin; C040235:Ketac-cem; D015034:Zinc Oxide