Fig. (1) Illustration of the microleakage interval scale. (a) no leakage =0, (b) leakage restricted to the enamel =1, (c) leakage into dentin but not reaching the axial cavity wall =2, (d) leakage reaching the axial cavity wall =3, (e) leakage beyond the axial cavity wall reaching the pulp = 4. The restoration locations marked with arrows.