Effects of removing adhesive from tooth surfaces by Er:YAG laser and a composite bur on enamel surface roughnessand pulp chamber temperature

Sogra Yassaei, Hossein Aghili, Neda Joshan


Background: At the end of fi xed orthodontic treatment, the remnant of adhesive should be eliminated
from the tooth surface. The purpose of this study was to compare the effect of three methods of
removing adhesive on enamel surface roughness, dental pulp t emperature, and also on the time spent.
Materials and Methods: The brackets on 90 extracted teeth were debonded using bracket removal
pliers. A thermocouple sensor was fi tted on the buccal wall of the pulp chamber through access
cavity to measure thermal changes during adhesive removal. The residue of adhesive was eliminated
from enamel surface of teeth by either tungsten carbide bur, erbium-doped yttrium aluminum
garnet laser, or fi ber reinforced composite bur. Scanning electron micrographs images were taken
to assess the roughness of enamel surface. The time spent for adhesive removal was recorded as
well. Chi-square test was used to evaluate the remnants of adhesive and enamel surface roughness;
t-test and also repeated measurement analysis of variance were applied at P < 0.05 to compare the
thermal changes of the pulp chamber and time spent between the methods of surface treatment.
Results: The results of surface roughness were signifi cantly different (P < 0.001). The pulp
temperature c hanged signifi cantly (P < 0.001). Tungsten carbide bur increased the temperature by
5.5°C signifi cantly slower than reinforced composite bur (P = 0.004), however removed the adhesive
residue faster than two other methods although not signifi cantly (P = 0.069).
Conclusion: Within the limitations of this study, fi ber reinforced composite bur created the
smoothest enamel surface while Er:YAG laser the roughest. Tungsten carbide and composite burs
generated more heat compared to Er:YAG laser. In addition, tungsten carbide bur was the fastest
and Er:YAG laser the slowest devices to remove adhesive residue.
Key Words: Adhesive removal, composite bur, laser, pulp temperature, surface roughness

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