OBJECTIVE The aim of this study was to correlate radiographic examination with the clinical periodontal condition in cases of biologic width invasion by overextending restoration margins in restored premolars and molars. METHODS The present pilot study involved nine people (mean age 32 years) with biologic width invasion by 21 surfaces overextending restoration margins in restored premolars and molars. Radiographs were made in a standardized unit using the interproximal technique and were evaluated by a single calibrated investigator. The clinical periodontal parameters were analyzed with the use of a computerized periodontal probe. Exploratory analysis and Spearman's correlation were used to perform statistical analyses (SPSS, p < 0.05). RESULTS The most prevalent teeth with biologic width invasion were second premolars and first molars. Mean plaque index was 30.76%, and bleeding on probing was 27.0%. The mesial surface was invaded in 47.6% of cases and the distal surface in 52.4%. The 21 sites with biologic width invasion were found in patients with the following periodontal status: periodontal health (11 sites), gingivitis (2 sites), mild periodontitis (7 sites) and moderate periodontitis (1 site). There was a correlation between plaque index and bleeding on probing with the horizontal component of the bone level. CONCLUSIONS There was correlation between the radiographic parameters of biologic width invasion and clinical conditions. The measure of the bone crest level correlated with the gingival recession. The horizontal component of bone defect correlated with plaque index and bleeding on probing.