Effect of a filled adhesive as the desensitizer on bond strength of “Self‐Adhesive Cements To” differently severity of fluorosed dentin

• Published in: Microscopy research and technique 2018-08, Vol.81 (8), p.805-815
• Main Authors: Tan, Yujie, Gu, Mengqin, Li, Wangyang, Guo, Ling, Diaspro, Alberto
• Format: Article
• Language: English
• Subjects: Adhesion tests; Adhesive strength; Adhesives; Bond strength; Bonding strength; cements; Composite materials; Cylinders; Dental Bonding; Dental cement; Dental Cements; Dentin; Dentin - drug effects; Dentin Desensitizing Agents - administration & dosage; Desensitization; desensitizer; Factorial design; Fluorosis; Fluorosis, Dental - therapy; Glass ionomer cements; Humans; Mechanical Phenomena; Microscopy, Electron, Scanning; Occlusion; Pretreatment; Resin Cements; Scanning electron microscopy; shear bond strength; Statistical analysis; Statistics; Subgroups; Teeth; Thermal cycling; Tubules
• ISSN: 1059-910X; 1097-0029
• DOI: 10.1002/jemt.23039

The objectives were to evaluate the efficacy of a filled adhesive named Prime & Bond NT (P&B NT) as the dentin desensitizer in occluding fluorosis dentinal tubules and compare the shear bond strength (SBS) of RelyX U200 self‐adhesive resin cement (RXU) and RelyX Luting self‐adhesive resin‐modified glass ionomer cement (RMGIC) before and after P&B NT pretreatment. 176 non‐carious fluorosis were classified into four subgroups by the Thylstrup and Fejerskov index (TFI): normal group (TFI = 0), mild group (TFI = 1–3), moderate group (TFI = 4–5), severe group (TFI = 6–9). 160 composite cylinders (4 × 5 mm) were fabricated, then every severity of fluorosed dentin was subjected to four treatments: P&B NT + RXU (n = 40), RXU (n = 40), P&B NT + RMGIC (n = 40), RMGIC (n = 40). The specimens were immersed in water at 37°C for 24 hr first and half of them underwent 5,000 thermocycling before shear bond strength test. A factorial design (factorial 4 × 2 × 2 × 2) was developed to make statistical analysis. Scanning electron microscope (SEM) analysis (n = 16) in cross section and longitudinal section view characterized the occlusion situation of dentinal tubules. P&B NT might occlude dentinal tubules as the dentin desensitizer for normal teeth and mild‐moderate fluorosis. P&B NT significantly increased the SBS of RXU (p  .05). RXU could benefit from P&B NT desensitization to achieve a better quality of adhesion. P&B NT might occlude dentinal tubules as the dentin desensitizer for normal teeth and mild‐mediate fluorosis; Fluorosis adversely affected SBS of self‐adhesive resin cement and RMGIC to dentin; Self‐adhesive resin cements could benefit from P&B NT desensitization to achieve a better quality of adhesion.