Introduction: Tooth eruption is a complex process and may fail to occur due to several reasons. Primary failure of eruption (PFE) is one of the rare eruption disturbances which do not related to any obstruction in the eruptive pathway or any systematic disorders. This type of eruption failure often affects the posterior teeth and results in subsequent posterior open bite. Any orthodontic attempt is ineffective due to lack of inherent eruptive potential of tooth. Case Report: An 8-year-old skeletal class II young boy with posterior open bites was referred to our department for the poor chewing function. Clinical finding showed infra-occluded first molars and submerged adjacent primary second molars in the UL and LR quadrants. Primary failure of eruption was diagnosed in this case and periodic radiographic examination, including panoramic radiographs and cone beam computerized tomography (CBCT) is performed. Early extractions of the submerged primary molars allowed the successors erupt normally according to our regular review. Discussion: Early diagnosis and regular review of the PFE case is essential. No orthodontic tooth movement or prosthodontic rehabilitation should be commenced until which teeth being affected have confirmed. Conclusion: Therapeutic treatment planning is inevitable in case with primary failure of eruption. Periodic examination and forming treatment plans accordingly is important in this type of case.

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Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.