牙体牙髓牙周病学杂志
牙體牙髓牙週病學雜誌
아체아수아주병학잡지
CHINESE JOURNAL OF CONSERVATIVE DENTISTRY
2014年
8期
469-472,480
,共5页
周涛%赵长铭%柴治国%沈丽娟%焦凯%牛丽娜%顾永春%田敏%曾光
週濤%趙長銘%柴治國%瀋麗娟%焦凱%牛麗娜%顧永春%田敏%曾光
주도%조장명%시치국%침려연%초개%우려나%고영춘%전민%증광
下颌第二恒磨牙%C形根管%根管系统%显微CT
下頜第二恆磨牙%C形根管%根管繫統%顯微CT
하합제이항마아%C형근관%근관계통%현미CT
permanent mandibular second molar%c-shaped canal%root canal system%micro-CT
目的：观察下颌第二恒磨牙牙根及根管系统的解剖特点。方法：采集中国汉族患者拔除的下颌第二恒磨牙75个，分为双根组（n＝32）和C形根组（n＝43）。显微CT扫描后用Mimics10．01软件三维重建。比较2组髓室底形态以及各型根管、侧副管的发生情况。结果：双根组近中根根管多为1-1型（31．3％）及2-1型（34．4％），远中根多为1-1型（87．5％）；近中根存在侧副根管牙根的发生率（65．6％）高于远中根（25．0％）（P＜0．05）。C形根组以Ⅰ、Ⅳ型髓室底最为多见（均为30．2％）；C形根管以Melton Ⅲ型最为常见（58．1％），其次为Melton Ⅰ型（27．9％）及Melton Ⅱ型（14．0％）。双根组和C形根组存在侧副根管牙根的发生率分别为75％和51．2％（P＞0．05）。结论：双根下颌第二磨牙近中根的根管系统较远中根复杂；而C形根常常对应一个复杂的C形根管系统。根管峡区不同部位、不同程度的带状牙本质融合会影响C形根管类。
目的：觀察下頜第二恆磨牙牙根及根管繫統的解剖特點。方法：採集中國漢族患者拔除的下頜第二恆磨牙75箇，分為雙根組（n＝32）和C形根組（n＝43）。顯微CT掃描後用Mimics10．01軟件三維重建。比較2組髓室底形態以及各型根管、側副管的髮生情況。結果：雙根組近中根根管多為1-1型（31．3％）及2-1型（34．4％），遠中根多為1-1型（87．5％）；近中根存在側副根管牙根的髮生率（65．6％）高于遠中根（25．0％）（P＜0．05）。C形根組以Ⅰ、Ⅳ型髓室底最為多見（均為30．2％）；C形根管以Melton Ⅲ型最為常見（58．1％），其次為Melton Ⅰ型（27．9％）及Melton Ⅱ型（14．0％）。雙根組和C形根組存在側副根管牙根的髮生率分彆為75％和51．2％（P＞0．05）。結論：雙根下頜第二磨牙近中根的根管繫統較遠中根複雜；而C形根常常對應一箇複雜的C形根管繫統。根管峽區不同部位、不同程度的帶狀牙本質融閤會影響C形根管類。
목적：관찰하합제이항마아아근급근관계통적해부특점。방법：채집중국한족환자발제적하합제이항마아75개，분위쌍근조（n＝32）화C형근조（n＝43）。현미CT소묘후용Mimics10．01연건삼유중건。비교2조수실저형태이급각형근관、측부관적발생정황。결과：쌍근조근중근근관다위1-1형（31．3％）급2-1형（34．4％），원중근다위1-1형（87．5％）；근중근존재측부근관아근적발생솔（65．6％）고우원중근（25．0％）（P＜0．05）。C형근조이Ⅰ、Ⅳ형수실저최위다견（균위30．2％）；C형근관이Melton Ⅲ형최위상견（58．1％），기차위Melton Ⅰ형（27．9％）급Melton Ⅱ형（14．0％）。쌍근조화C형근조존재측부근관아근적발생솔분별위75％화51．2％（P＞0．05）。결론：쌍근하합제이마아근중근적근관계통교원중근복잡；이C형근상상대응일개복잡적C형근관계통。근관협구불동부위、불동정도적대상아본질융합회영향C형근관류。
AIM:To observe the anatomic features of root and root canal systems of permanent mandibular second molars.METHODS:75 extracted permanent mandibular second molars,32 with 2 roots(2R group)and 43 with one C-shaped root(CR group),from native Chinese subjects were scanned with micro-CT.3D models of the teeth were reconstructed by Mimics 10.01 software.The anatomy of the pulp chamber floor,incidence of various forms of root canals and accessory canals were determined.RESULTS:In 2R group,type 2-1 (34.4%)and 1 -1 canal sys-temss (31.3%)were common in the mesial roots,and type 1 -1 canal system (87.5%)was frequent in the distal roots.In CR group type I (30.2%)and type IV (30.2%)pulp chamber floor were common.The incidences of Mel-ton Ⅰ,Ⅱ and Ⅲcanal form were 27.9%,14.0%and 58.1%respectively.In 2R group the incidences of accessory canals of the mesial and distal roots were 65.6%and 25.0%respectively(P<0.05).The incidences of accessory ca-nals in 2R and CR groups was 75.0%and 51.2%respectively (P>0.05).CONCLUSION:The root canal system of the mesial roots in 2-rooted mandibular second molars is more complex than that of the distal roots.The degree and location of the dentin confusion at the isthmus zones determine the type of the C-shaped canals.
