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Bond strength with APF applied after acid etching

C L Meng1, C H Li, W N Wang

  • 1National Defense Medical Center, School of Dentistry, Taipei, Taiwan, Republic of China.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|November 11, 1998
PubMed
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Applying fluoride before orthodontic bracketing may reduce enamel demineralization but significantly weakens bracket bond strength, increasing the risk of enamel fracture during debonding.

Area of Science:

  • Dental Materials Science
  • Orthodontic Research
  • Preventive Dentistry

Background:

  • Successful orthodontic treatment aims to prevent enamel demineralization and discoloration.
  • Fluoride application is known to reduce enamel demineralization.

Purpose of the Study:

  • To evaluate the effect of pre-bracketing fluoride application on orthodontic bond strength.
  • To determine if fluoride incorporation into enamel before bonding adversely affects bond strength.

Main Methods:

  • Forty human premolars were divided into control and experimental groups.
  • The experimental group received 1.23% acidulated phosphate fluoride immersion post-acid etching.
  • Brackets were bonded, debonded using an Instron machine, and analyzed via SEM and energy dispersive x-ray spectrometry.

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Main Results:

  • The experimental group (fluoride-treated) exhibited significantly lower bond strength compared to the control group.
  • Enamel detachment (fracture) was exclusively observed in the fluoride-treated experimental group.
  • Fluoride application after acid etching negatively impacted orthodontic bond strength.

Conclusions:

  • While acidulated phosphate fluoride can prevent decalcification, its use before orthodontic bracketing compromises bond strength.
  • Fluoride application post-acid etching leads to decreased bond strength and enamel detachment.
  • The findings indicate an adverse effect of pre-bracketing fluoride application on the bond strength of human enamel in orthodontics.