Heat generated by residual adhesive removal after debonding of brackets.
OBJECTIVE
To measure the rise in temperature during mechanical removal of residual adhesive after debonding of brackets in vitro.


METHODS
Different carbide burs on a high-speed handpiece were tested. Acrylic on the buccal surfaces of recently extracted human maxillary incisors was removed using 3 types of carbide burs (6-, 12-, 40-fluted) with a varying number of windings relative to the long axis of the shaft. The temperature was measured using a thermocouple probe in the pulp chamber of the extracted teeth.


RESULTS
The highest mean rise in temperature was measured using a 6-fluted bur (+9.4 degrees C, P < .001), followed by the 12-fluted bur (+6.5 degrees C, P <.001). The lowest rise in temperature (+1.2 degrees C, not significant) was seen with a 40-fluted bur. After 3 to 8 seconds of continuous grinding, the rise in temperature seems to slow down.


CONCLUSIONS
The removal of residual adhesive after debonding is best performed with fine burs. If 6-fluted burs are used, a pause after 5 to 10 seconds of continuous grinding is recommended, especially in the mandibular anterior area.
Jonke
Erwin
E
Department of Orthodontics, Vienna University Dental School, Vienna, Austria. erwin.jonke@meduniwien.ac.at
Weiland
Frank
F
Freudenthaler
Josef W
JW
Bantleon
Hans Peter
HP
D001831:Body Temperature; D017005:Dental Debonding / Q000295:instrumentation*; D003755:Dental High-Speed Technique; D003762:Dental Instruments; D003782:Dental Pulp / Q000502:physiology; D004867:Equipment Design; D006358:Hot Temperature; D006801:Humans; D007180:Incisor; D016910:Orthodontic Brackets; D017973:Tungsten Compounds
D017973:Tungsten Compounds; C002802:tungsten carbide