IADR Abstract Archives

Enamel Surface Changes Observed in Gel vs. Light Activation Whitening

Objectives: Observational study to detect microstructural enamel surface changes of gel-based versus light activation whitening.
Methods: Six human extracted mandibular incisors in distilled water were assigned to one of six groups: CON = control, PE = 35% phosphoric etch, CP = 16% carbamide peroxide gel, HP = 25% hydrogen peroxide (Philips Zoom!® gel), HP+LA = HP plus light activation (Philips Zoom! WhiteSpeed©, medium intensity), and RELACP = HP+LA with ReliefACP© gel (Philips). PE was applied for 30 seconds, CP for 4 hours/day x 7 days, HP, HP+LA and RELACP for 1 hour with gel replacement every 15 minutes, and ReliefACP applied for 30 minutes to RELACP post-whitening. Color analysis was obtained using Olympus Crystaleye Spectrophotometer with L, a, b values averaged over 3 trials per condition both before and after treatment. Crown body overall color difference (DE) was calculated subtracting post-treatment L,a,b values from pre-treatment L,a,b values (standard). Post-treatment samples were imaged using Scanning Electron Microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDS) to determine structural morphology of the enamel surface changes.
Results: All whitening conditions demonstrated color differences compared to CON (Table 1). SEM images showed spot-like enamel changes in HP compared to CON, but CP did not. HP+LA demonstrated homogenous enamel microstructural changes compared to CON, but RELACP application showed morphological improvement from HP+LA.
Conclusions: Gel-based and light activation whitening alters quantitative color, but SEM qualitative imaging demonstrates changes of depressions and porosities in enamel microstructure. However, ReliefACP treatment reduced enamel surface degradation, although a study with an increased sample size is needed to determine preliminary data significance.
Division: IADR/AADR/CADR General Session
Meeting: 2017 IADR/AADR/CADR General Session (San Francisco, California)
Location: San Francisco, California
Year: 2017
Final Presentation ID: 1940
Abstract Category|Abstract Category(s): Dental Materials 7: Color and Appearance (Esthetics)
Authors
  • Falone, Anthony  ( Tufts University School of Dental Medicine , Boston , Massachusetts , United States )
  • Daddona, Jeffrey  ( Tufts University School of Dental Medicine , Boston , Massachusetts , United States )
  • Kang, Yoon  ( Tufts University School of Dental Medicine , Boston , Massachusetts , United States )
  • Papathanasiou, Aikaterini  ( Tufts University School of Dental Medicine , Boston , Massachusetts , United States )
  • Financial Interest Disclosure: None.
    SESSION INFORMATION
    Poster Session
    Color and Appearance (Esthetics) V
    Friday, 03/24/2017 , 11:00AM - 12:15PM
    IMAGES