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Congenital Missing of Maxillary Bilateral and Mandibular Right Primary Canines with a Peg-Shaped Mandibular Left Primary Canine: A Case Report

乳犬齒先天缺失合併錐形齒形態變異:病例報告

摘要


Background. Several studies have revealed that congenital missing in primary dentition is uncommon and the most frequently affected teeth are lateral incisors, usually accompanied with the missing of succedaneous teeth. The congenital absence of primary canines is especially a rare finding in the dental literature. Case report. This case report presented a 3-year-8-months-old Chinese girl with her multiple caries, was found congenitally missing of maxillary bilateral primary canines and mandibular right primary canine. However, the succedaneous teeth of the missing primary canines were all evident on the panoramic radiograph, and all of the permanent tooth germs except for the third molars were developing consistent with her chronological age. Conclusion. There are only a few studies in the literature have reported the finding of missing primary canines. The aim of this case report is to increase the awareness that congenital missing of primary canines does happen despite of the low incidence, and provide future therapeutic directions of the management in dealing with the complications in primary and mixed dentition.

並列摘要


大多數研究指出乳牙先天缺牙很少見,而且多半發生在側門牙並伴隨著繼生齒的缺失。本病例是一名三歲八個月的女生因為多顆蛀牙而來求診,經檢查發現其乳牙犬齒有三顆天生缺牙,只有左下乳犬齒萌出而且為釘狀齒型態。放射線檢查中發現恆牙牙胚皆為正常發育中沒有缺失。本篇討論了乳犬齒缺失在乳牙齒列及混合齒列可能遇到的問題,並探討可能的處置以及介入的時機。

並列關鍵字

先天缺牙 缺牙症 發育不全 乳犬齒 釘狀齒

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