华西口腔医学杂志
華西口腔醫學雜誌
화서구강의학잡지
WEST CHINA JOURNAL OF STOMATOLOGY
2010年
2期
162-165,169
,共5页
显微CT%下颌第二前磨牙%根管%锥度
顯微CT%下頜第二前磨牙%根管%錐度
현미CT%하합제이전마아%근관%추도
Micro-CT%mandibular second premolar%root canal%taper
目的 探讨青少年下颌第二前磨牙单根管的初始锥度.方法 收集牙体完整的13～23岁单根管离体下颌第二前磨牙23颗,采用显微CT对标本从根尖向冠方进行断层扫描,将每个根管平均分为3段,通过3ddoctor软件测量根管的近远中向管径及颊舌向管径,计算这3个水平段颊舌向和近远中向根管锥度.结果 根管近远中向锥度由根冠至根尖分别为0.06、0.08、0.07,颊舌向锥度由根冠至根尖分别为0.32、0.21、0.25.颊舌向3段锥度之间的差异均有统计学意义(P<0.05),而近远中向3段锥度之间的差异无统计学意义(P>0.05).结论 13～23岁单根管下颌第二前磨牙根管颊舌向锥度变化明显,最小的锥度在根中1/3.近远中向锥度较颊舌向小,但根管上下差别不大.
目的 探討青少年下頜第二前磨牙單根管的初始錐度.方法 收集牙體完整的13～23歲單根管離體下頜第二前磨牙23顆,採用顯微CT對標本從根尖嚮冠方進行斷層掃描,將每箇根管平均分為3段,通過3ddoctor軟件測量根管的近遠中嚮管徑及頰舌嚮管徑,計算這3箇水平段頰舌嚮和近遠中嚮根管錐度.結果 根管近遠中嚮錐度由根冠至根尖分彆為0.06、0.08、0.07,頰舌嚮錐度由根冠至根尖分彆為0.32、0.21、0.25.頰舌嚮3段錐度之間的差異均有統計學意義(P<0.05),而近遠中嚮3段錐度之間的差異無統計學意義(P>0.05).結論 13～23歲單根管下頜第二前磨牙根管頰舌嚮錐度變化明顯,最小的錐度在根中1/3.近遠中嚮錐度較頰舌嚮小,但根管上下差彆不大.
목적 탐토청소년하합제이전마아단근관적초시추도.방법 수집아체완정적13～23세단근관리체하합제이전마아23과,채용현미CT대표본종근첨향관방진행단층소묘,장매개근관평균분위3단,통과3ddoctor연건측량근관적근원중향관경급협설향관경,계산저3개수평단협설향화근원중향근관추도.결과 근관근원중향추도유근관지근첨분별위0.06、0.08、0.07,협설향추도유근관지근첨분별위0.32、0.21、0.25.협설향3단추도지간적차이균유통계학의의(P<0.05),이근원중향3단추도지간적차이무통계학의의(P>0.05).결론 13～23세단근관하합제이전마아근관협설향추도변화명현,최소적추도재근중1/3.근원중향추도교협설향소,단근관상하차별불대.
Objective To determine the root canal initial taper of mandibular second premolars of 13-23 year-old people by using Micro-CT. Methods 23 extracted, single root, human root canal of mandibular second premolars of 13-23 year-old people were selected. The teeth were embedded in resin. The resins were scanned using Micro-CT at a resolution of 10 μm. The photographs at each level of 1 mm perpendicular to the long axis of the tooth were chosen. Bucco-lingual (BL) and mesio-distal (MD) diameters of each canal were measured at cervical, middle and apical third of the canals. Finally the taper were calculated and analyzed. Results The average taper of cervical, middle, and apical third of adolescents' root canals were 0.06, 0.08, 0.07 (mesio-distal direction) and 0.32, 0.21, 0.25 (bucco-lingual direction). The difference was not observed among three level on mesio-distal direction about the canal taper by t-test(P>0.05), but there was difference among three level on bucco-lingual direction about the canal taper by t-test (P<0.05). Conclusion The change of bucco-lingual taper of mandibular second premolar of 13-23 year-old people is obvious, and the smallest taper is in middle third of the canal. The mesio-distal taper of the canals is smaller than the bucco-lingual taper and the change of mesio-distal taper isn't obvious.
