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Related Experiment Videos

Ceramic bracket debonding with the carbon dioxide laser

J L Rickabaugh1, R D Marangoni, K K McCaffrey

  • 1Department of Mechanical Engineering, University of Pittsburgh, USA.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|October 1, 1996
PubMed
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Laser-assisted ceramic bracket removal using a carbon dioxide laser requires mechanical assistance to prevent tooth damage. Applying a static tensile force during lasing effectively reduces debonding time and intrapulpal temperature increase.

Area of Science:

  • Biomaterials Science
  • Dental Materials
  • Laser Dentistry

Background:

  • Conventional ceramic bracket removal poses risks of bracket fracture and enamel loss.
  • Lasers offer a potential solution by thermally softening bonding resin, but heat generation can endanger tooth vitality.
  • Mechanical assistance during laser debonding is crucial to maintain intrapulpal temperature below the safety threshold.

Purpose of the Study:

  • To investigate the efficacy of combining carbon dioxide laser irradiation with mechanical tensile force for ceramic bracket debonding.
  • To assess the impact of varying static tensile forces on debonding time and intrapulpal temperature increase.
  • To determine optimal parameters for safe and efficient laser-assisted ceramic bracket removal.

Main Methods:

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  • A modified debonding plier was used to apply simultaneous tensile force and carbon dioxide laser energy to ceramic brackets bonded to bovine incisor teeth.
  • Four groups were tested: a control group and three experimental groups subjected to static tensile forces of 3, 1.5, or 0.75 pounds during lasing at 20 W.
  • Debonding time and intrapulpal temperature increase were measured for each group (n=10).

    • Main Results:

    • All experimental groups demonstrated successful bracket removal with simultaneous laser application and mechanical force.
    • Lower static tensile forces (0.75 pounds) resulted in significantly longer debonding times (3.42 seconds) and higher intrapulpal temperature increases (4.47°C).
    • Higher static tensile forces (3 pounds) led to shorter debonding times (1.64 seconds) and lower intrapulpal temperature increases (1.80°C).

    Conclusions:

    • Simultaneous application of mechanical tensile force and carbon dioxide laser significantly reduces ceramic bracket debonding time.
    • The level of static tensile force applied directly influences both debonding efficiency and the risk of thermal damage to the tooth pulp.
    • Optimizing mechanical assistance during laser debonding is essential for safe and effective ceramic bracket removal in clinical practice.