Marginal adaptation of the integral ceramic inlays along with the ceramic integrity was investigated by a non invasive method, Optical Coherence Tomography working in Time Domain mode. Some of the samples presented a good close interface between the ceramic restorations and tooth structures. All the ceramic samples presented material defects. Optical Coherence Tomography proves its capability of a good and non invasive evaluation of the integral ceramic inlay. ceramic inlay, optical coherence tomography, marginal fit, material defect