Methods: The physical properties were evaluated by the tests: Permeability (n=12), Microhardness (n=12), Radiodensity (n=10) and Ultimate Tensile Strength (n=15). Data distribution and homogeneity were analyzed. Data distribution was normal and homogenous. Thus, one-way analysis of variance (type of substrate) was used for the Permeability; two-way analysis of variance (type of substrate and depth) was used for the Microtensile Bond Strength test (p<0.05); data from Radiodensity and test were analyzed using the Student’s t-test.
Results: Considering the limitations of an in vitro investigation, the findings revealed that with respect to the physical properties, the enamel of deciduous teeth presented greater permeability and radiodensity and lower ultimate bond strength and substrate when compared with the enamel of permanent teeth.
Conclusions: Therefore, the enamel of deciduous teeth presented different physical properties compared to the permanent teeth.
Keywords: Assessment, Enamel, Physical, Structure and Surfaces