Microleakage between composite-wire and composite-enamel interfaces of flexible spiral wire retainers. Part 2: comparison of amorphous calcium phosphate-containing adhesive with conventional lingual retainer composite.
The aim of this study was to test the hypothesis that there is no difference in the microleakage values of a newly developed amorphous calcium phosphate (ACP)-containing adhesive and a conventional lingual retainer composite at the composite-enamel and composite-wire interfaces of flexible spiral wire retainers (FSWRs). Sixty freshly extracted human mandibular incisors separated into three equal groups were used in this study. Multi-stranded 0.0215 inch diameter wire was bonded to enamel using conventional orthodontic adhesive (Transbond LR, 3M Unitek) and ACP-containing composite (Aegis Ortho, Harry J. Bosworth Co.), with or without the use of a primer. The specimens were sealed with nail varnish, stained with 0.5 per cent basic fuchsine for 24 hours, sectioned and examined under a stereomicroscope, and scored for microleakage at the composite-enamel and composite-wire interfaces from the mesial and distal margins. Statistical analyses were performed with Kruskal-Wallis and Mann-Whitney U-tests with a Bonferroni correction. Little or no microleakage was observed between the composite-enamel interface for any of the three groups, and any difference was not statistically significant. The amount of microleakage at the wire-composite interface was higher than that at the enamel-composite interface. Multiple comparison testing showed statistically significant differences in microleakage between Transbond LR and the ACP-containing adhesive used with primer at the composite-enamel and composite-wire interfaces (P < 0.001). ACP-containing adhesive used with primer showed the highest microleakage scores at the composite-enamel (mean: 0.39 +/- 0.42 mm) and composite-wire (mean: 1.66 +/- 0.47 mm) interfaces. The hypothesis is rejected. The ACP-containing composite used with or without primer showed significantly higher leakage at the composite-wire interface, while conventional lingual retainer composite showed lower microleakage scores.
Uysal
Tancan
T
Department of Orthodontics, University of Erciyes, Kayseri, Turkey. tancanuysal@yahoo.com
Ulker
Mustafa
M
Baysal
Asli
A
Usumez
Serdar
S
D002130:Calcium Phosphates / Q000009:adverse effects; D001840:Dental Bonding / Q000009:adverse effects; D003738:Dental Cements / Q000009:adverse effects / Q000737:chemistry; D003743:Dental Enamel; D003763:Dental Leakage / Q000209:etiology; D006801:Humans; D007180:Incisor; D008422:Materials Testing; D016382:Orthodontic Appliance Design; D018704:Orthodontic Retainers / Q000009:adverse effects; D009969:Orthodontic Wires / Q000009:adverse effects; D019279:Resin Cements / Q000009:adverse effects
C528777:Aegis Ortho adhesive; D002130:Calcium Phosphates; D003738:Dental Cements; D019279:Resin Cements; C481385:Transbond LR; C519480:amorphous calcium phosphate