Porcelain surface alterations and refinishing after use of two orthodontic bonding methods

T. Drew Herion, Jack L. Ferracane, David A. Covell

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Objective: To compare porcelain surfaces at debonding after use of two surface preparation methods and to evaluate a method for restoring the surface. Materials and Methods: Lava Ceram feldspathic porcelain discs (n = 40) underwent one of two surface treatments prior to bonding orthodontic brackets. Half the discs had sandblasting, hydrofluoric acid, and silane (SB + HF + S), and the other half, phosphoric acid and silane (PA + S). Brackets were debonded using bracket removing pliers, and resin was removed with a 12-fluted carbide bur. The surface was refinished using a porcelain polishing kit, followed by diamond polishing paste. Measurements for surface roughness (Ra), gloss, and color were made before bonding (baseline), after debonding, and after each step of refinishing. Surfaces were also examined by scanning electron microscopy (SEM). Data was analyzed with 2-way ANOVA followed by Tukey HSD tests (α = 0.05). Results: The SB + HF + S bonding method increased Ra (0.160 to 1.121 μm), decreased gloss (41.3 to 3.7) and altered color (ΔE = 4.37; P <.001). The PA + S method increased Ra (0.173 to 0.341 μm; P <.001), but the increase in Ra was significantly less than that caused by the SB + HF + S bonding method (P <. 001). The PA + S method caused insignificant changes in gloss (41.7 to 38.0) and color (ΔE = 0.50). The measurements and SEM observations showed that changes were fully restored to baseline with refinishing. Conclusions: The PA + S method caused significantly less damage to porcelain than the SB + HF + S method. The refinishing protocol fully restored the porcelain surfaces.

Original languageEnglish (US)
Pages (from-to)167-174
Number of pages8
JournalAngle Orthodontist
Volume80
Issue number1
DOIs
StatePublished - Jan 1 2010

Keywords

  • Debonding
  • Orthodontic bonding
  • Polishing
  • Porcelain
  • Refinishing
  • Surface roughness

ASJC Scopus subject areas

  • Orthodontics

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