Case #821: 8-year-old boy with unusually shaped incisors and missing teeth   
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Our appreciation is extended to Dr. Juan Yepes, Indiana University School of Dentistry Department of Pediatric Dentistry and Riley Hospital for Children, for contributing this case.

History: An 8-year-old boy was referred to a pediatric dentist by a family dentist because of the unusual shape of his mandibular incisors and several missing teeth.

His past medical history was noncontributory. The extraoral exam was within normal limits, while the intraoral examination revealed unusually shaped teeth.

The pediatric dentist ordered a panoramic film, which is provided below along with a cropped view of the left and right side. Click to enlarge the images.

Based on the history and images, what is the most likely diagnosis?
Cleidocranial dysplasia
Ectodermal dysplasia
Dentinogenesis imperfecta
Amelogenesis imperfecta