Severe re-impacted deciduous tooth in 25-years-old female with permanent dentition associated to high-risk oral-sinus communication surgery: a rare case report.

INTRODUCTION AND IMPORTANCE: The total re-impaction of primary tooth is a very uncommon phenomenon and few cases have been reported in the literature. "Re-Impaction of deciduous tooth " is a rare phenomena involving more often mixed denture than permanent dentition.

CASE PRESENTATION: A completely re-impacted deciduous tooth in an adult patient presented an occlusal tooth decay. The presence of the decay cavity indicated that this tooth had once been erupted. After the removal, the tooth anatomy confirmed that it was deciduous tooth.

CLINICAL DISCUSSION: The etiologies remain diverse but the local contributing factors local factors include odontomas, ankylosis, congenitally missing permanent teeth, trauma. The early diagnosis by knowledge of the clinical and radiological image of re-impaction allows early detection, which in turn prevents subsequent complications.

CONCLUSION: The clinicians must be aware that late discovery managing re-impacted and severely infraoccluded deciduous tooth is in risk of causing permanent injury.