American Journal of Orthodontics and Dentofacial Orthopedics
Original ArticleEffects of conventional and high-intensity light-curing on enamel shear bond strength of composite resin and resin-modified glass-ionomer*,**,*,**,*,**
Section snippets
Material and methods
One hundred twenty freshly extracted bovine permanent mandibular incisors were collected from a local slaughterhouse and stored in a solution of 0.1% (weight/volume) thymol for 1 week. The criteria for tooth selection included intact buccal and lingual enamel with no cracks caused by the pressure of the extraction forceps and no caries. The teeth were randomly assigned to 1 of 8 groups. Each group consisted of 15 specimens. The teeth were cleansed of soft tissue and embedded in cold-curing,
Results
The descriptive statistics of the shear bond strength for each group are shown in Table I and Fig 1.Empty Cell Mean ± SD (MPa) Median (MPa) Range (MPa) Sample size (n) Transbond XT Ortholux XT 24.1 ± 5.5 23.3 13.0-34.6 15 Plasma arc 2 sec 25.8 ± 5.9 27.0 9.7-32.0 15 5 sec 24.8 ± 5.3 25.6 9.6-32.0 15 10 sec 25.3 ± 5.2 26.3 13.0-34.2 15 Fuji Ortho LC Ortholux XT 18.2 ± 3.2 18.7 12.6-25.0 15 Plasma arc 2 sec 17.9 ± 3.6 17.3 11.2-25.2 15 5 sec 15.9 ± 3.7 15.1 11.0-23.0
Discussion
The present study indicated that, regardless of the adhesive used (composite or resin-modified glass ionomer), the shear bond strength of each bonding agent cured with the PAC System for 2, 5, and 10 seconds was not significantly different from that of the same adhesive cured with a conventional VLC unit.
Previous studies have shown that bovine and human enamel are similar in their physical properties, composition, and bond strength.14, 19 Bovine enamel has been reported to be a reliable
Conclusions
After a 24-hour period, both Transbond XT and Fuji Ortho LC provide bond strengths adequate for clinical use when cured with the xenon arc light. The shear bond strengths of both adhesives cured with the xenon arc light are not statistically different from those achieved by curing with the conventional VLC unit. Light-curing for only 2 seconds with the xenon arc light does not preclude clinically acceptable bond strength of composite resin or resin-modified glass ionomer. Composite resin has a
Acknowledgements
We thank Leone, 3M/Unitek, and GC America Inc for providing the materials tested in this study and Mr Gabriele Scommegna and Mr Elia Ladani (Leone) for their technical assistance.
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aPostgraduate Resident, Department of Orthodontics, University of Pavia.
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bAssistant Clinical Professor, Department of Orthodontics, University of Pavia and University of Aarhus.
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cStatistician, Clinical Epidemiology and Biometry Unit, Scientific Direction.
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dProfessor and Chair, Department of Orthodontics, University of Pavia.
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Reprint requests to: Vittorio Cacciafesta, DDS, MSc, c/o studio Prof Giuseppe Sfondrini, Via Libertà 17, 27100 Pavia, Italy; e-mail, [email protected].
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Am J Orthod Dentofacial Orthop 2001;119:30-5