| material  | 
        Etch-and-rinse
          (Adper™ Scotchbond) | 
        Self-Etch
          (Adper™ Easy Bond 3M) | 
        Fisher | 
        P value | 
       
      
        | Superficial 
          dentin  | 
        0.43 ( 0.27) | 
        0.8 (0.35) | 
        b | 
        < 0.0001 | 
       
      
        | Deepdentin  | 
        0.17 (0.12) | 
        0.42 (0.31) | 
        b | 
        0.006 | 
       
      
        | ANOVA  | 
        b | 
        b | 
          | 
          | 
       
      
        | P value  | 
        0.003 | 
        < 0.0001 | 
          | 
          | 
       
     
    a Means are not significantly different (Fisher’s    test) 
b if the p-value <0.05, the MPa for debonding is    significantly different |