A 4-year-old child presents with a full set of primary teeth that appear gray and show significant wear on the biting surfaces. Radiographs reveal abundant secondary dentin formation within these teeth. What is the most probable diagnosis?

Explanation

The clinical features of gray discoloration, severe occlusal and incisal wear, along with radiographic evidence of excessive secondary dentin, are characteristic of dentinogenesis imperfecta. Other listed conditions do not typically present with these combined findings.