Effects of Surface Pretreatments on Bond Strength and Morphology of Aprismatic Enamel

J Adhes Dent. 2022 Oct 18;24(1):367-374. doi: 10.3290/j.jad.b3240701.

Abstract

Purpose: To evaluate the effect of different pretreatment protocols and adhesives on the shear bond strength and surface morphology of aprismatic enamel.

Materials and methods: Human maxillary incisors (N = 120) were assigned to five different groups according to pretreatment: 1) no treatment; 2) glycine; 3) sodium bicarbonate; 4) Al2O3 and 5) extra-fine bur. Then the teeth were divided into three subgroups, according to the adhesive applied: 3-step etch-and-rinse (ER), universal adhesive in ER mode, and universal adhesive in self-etch (SE) mode. Shear bond strength (SBS) testing was performed with a universal testing machine. For SEM observation, fifteen human molars were collected and analyzed after pretreatment with/without etching with 37% H3PO4 for 30s.

Results: Al2O3 showed higher SBS than all other groups considered. Comparable SBS values were obtained for other pretreatments. Universal adhesive in E&R mode performed better than did 3-step E&R and universal adhesive in SE mode. SEM images showed visible differences in enamel surface roughness.

Conclusions: Airborne-particle abrasion with Al2O3 followed by etching with H3PO4 increased SBS on aprismatic enamel. The combination of airborne-particle abrasion with alumina powder followed by 15 s of H3PO4 etching and application of a universal adhesive in E&R mode proved to be the most effective adhesive protocol.

Keywords: adhesion; airborne-particle abrasion; aprismatic enamel; no-prep restorations; polishing powders.

MeSH terms

  • Acid Etching, Dental* / methods
  • Aluminum Oxide
  • Dental Bonding* / methods
  • Dental Cements / chemistry
  • Dental Enamel
  • Dentin-Bonding Agents
  • Glycine
  • Humans
  • Materials Testing
  • Powders
  • Resin Cements / chemistry
  • Shear Strength
  • Sodium Bicarbonate

Substances

  • Dental Cements
  • Sodium Bicarbonate
  • Powders
  • Aluminum Oxide
  • Glycine
  • Resin Cements
  • Dentin-Bonding Agents