Separated root tip formation associated with a fractured tubercle of dens evaginatus: A case report  

作　　者：Zhi-Fang Wu Ling-Jiao Lu Hai-Yan Zheng Yan Tu Ying Shi Zi-Huai Zhou Lin-Xian Fang Bai-Ping Fu 

机构地区：[1]Department of Pediatric Dentistry,The Affiliated Hospital of Stomatology,School of Stomatology,Zhejiang University School of Medicine,Key Laboratory of Oral Biomedical Research of Zhejiang Province,Hangzhou 310006,Zhejiang Province,China [2]Department of Prosthodontics,The Affiliated Hospital of Stomatology,School of Stomatology,Zhejiang University School of Medicine,Key Laboratory of Oral Biomedical Research of Zhejiang Province,Hangzhou 310006,Zhejiang Province,China [3]Department of Endodontics,The Affiliated Hospital of Stomatology,School of Stomatology,Zhejiang University School of Medicine,Key Laboratory of Oral Biomedical Research of Zhejiang Province,Hangzhou 310006,Zhejiang Province,China

出　　处：《World Journal of Clinical Cases》2021年第12期2944-2950,共7页世界临床病例杂志

基　　金：National Natural Science Foundation of China,No.81801028;Natural Science Foundation of Zhejiang Province,No.LQ19H140001.

摘　　要：BACKGROUND Several previous studies have reported an unusual root formation in which a fractured apical fragment of an immature root continued to develop independent of the main root after trauma to an immature tooth.To date,there have been only rare reports of the continuing apical formation of the fractured root associated with dens evaginatus(DE).This paper presents a case of a separated root tip formation associated with a fractured tubercle of DE.CASE SUMMARY An 11-year-old boy was referred for gingival sinus on the buccal side of the right mandibular second premolar(tooth#45).Clinically,tooth#45 was free of caries,but there was a sign of a fractured tubercle of DE on the occlusal surface.Radiography showed that the root canal of tooth#45 was widely radiolucent.A separated root apex was found apically under the main root and was nearly completely formed with an apical orifice at the apical tip.Tooth#45 was diagnosed as tubular fracture of DE with chronic apical periodontitis.A revascularization technique was recommended to treat the tooth.At 3-mo and 1-yr follow-up,the patient remained asymptomatic.Periapical radiography revealed that the separated root tip distally drifted with closure of the apex.However,the root length and thickness of the main root did not increased.CONCLUSION Clinicians should be aware that even if tubercle of DE is fractured in an immature tooth,the root tip may be separated from the main root and completely formed.

关 键 词：Separated root tip Dens evaginatus Tubercle fracture Young permanent tooth REVASCULARIZATION Case report 

分 类 号：R781.2[医药卫生—口腔医学]