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The European Journal of Orthodontics Advance Access published online on July 16, 2008
The European Journal of Orthodontics, doi:10.1093/ejo/cjn013
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© The Author 2008. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Temperature rise and shear bond strength of bondable buccal tubes bonded by various light sources

Çagri Ulusoy*, Özgür Irmak**, Yildirim Hakan Bagis** and Özgür Ilke Atasoy Ulusoy***

* Department of Orthodontics, Ankara University, Turkey
*** Restorative Dentistry and Endodontics Gazi University, Ankara University, Turkey
** Department of Restorative Dentistry, Ankara University, Turkey

Address for correspondenceDr Çagri Ulusoy, Gazi Üniversitesi, Dis Hekimligi Fakültesi, Ortodonti Ana Bilim Dali, 8. Cadde 1. Sokak, Emek 06510, Ankara, Turkey, E-mail:culusoy77{at}hotmail.com


  Abstract

The objective of the present investigation was to determine the intrapulpal temperature changes and to compare the shear bond strength (SBS) of bondable buccal tubes bonded by high-intensity light sources.

Ninety caries-free human first molar teeth extracted for periodontal reasons were used. For the temperature measurement test, 30 teeth were randomly divided into three groups (n = 10) whereas 60 teeth were used in three groups (n = 20) for SBS testing. Three light sources, high-intensity halogen, blue light-emitting diode (LED), and xenon plasma arc (PAC), were used for polymerization of Transbond XT. Temperature variations ({Delta}T) were recorded by a K-type thermocouple wire connected to a data logger. For SBS testing, a universal testing machine was used at a crosshead speed of 1 mm/minute until buccal tube bonding failure occurred. Data were analyzed using the Kruskal–Wallis test.

The high-intensity halogen light resulted in significantly (P < 0.01) higher intrapulpal temperature changes than the LED or PAC. The results of the shear bond test revealed significant (P < 0.05) differences only between the halogen and LED groups.

The findings of the present investigation showed that high-intensity curing devices can safely be used in bonding buccal tubes to molar teeth without causing a deleterious effect on the dental pulp.


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