Repair of composites: Effect of laser and different surface treatments

Daphne C. Barcellos, Vivian M. Miyazaki Santos, Li Na Niu, David H. Pashley, Franklin R. Tay, Cesar R. Pucci

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Objectives This study investigated the repairs of resin composite restorations after using different surface treatments. Design Eighty four truncated cones of Filtek Z350 were prepared and thermo-cycled (20,000 cycles). Surfaces were roughened with diamond bur and etched with 37% phosphoric acid. Those cones were divided into 7 groups (N=12): 1) Prime&Bond 2.1; 2) aluminum oxide sandblasting+Prime&Bond 2.1; 3) Er:YAG laser treatment+Prime&Bond 2.1; 4) 9.6% hydrofluoric acid for 2 min+silane coupling agent.; 5) silane coupling agent; 6) auto-polymerized acrylic monomer+Prime&Bond 2.1; 7) Adper Scothbond SE. Teflon device was used to fabricate inverted truncated cones of repair composite over the surface-treated. The bonded specimens were stressed to failure under tension. The data were analyzed with one-way ANOVA and Tukey tests. Results Mean repair strengths (SD, in MPa) were, Group-2: 18.8a; Group-1: 18.7a; Group-6: 13.4ab; Group-7: 9.5bc; Group-3: 7.5bcd; Group-4: 5.2cd; Group-5: 2.6d. Conclusions The use of diamond bur and a conventional adhesive and the use of aluminum oxide sandblasting prior to adhesive provided a simple and cost-effective solutions to composite repair. Er:YAG laser, silane alone, 9.6% hydrofluoric acid plus silane or a self-etching adhesive results in inferior composite repair strengths. Clinical relevance Diamond bur roughening alone or in combination with aluminum oxide sandblasting is equally effective in preparing a roughened surface for resin composite repair using Prime&Bond 2.1 as the adhesive.

Original languageEnglish (US)
Pages (from-to)1-6
Number of pages6
JournalInternational Journal of Adhesion and Adhesives
StatePublished - Jun 2015


  • Composite resin repair
  • Laser
  • Nanofilled composite resin
  • Silane
  • Silica coating

ASJC Scopus subject areas

  • Biomaterials
  • Chemical Engineering(all)
  • Polymers and Plastics


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