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
12期
705-708,728
,共5页
王书明%张大鹏%郑亚琪%吴国锋
王書明%張大鵬%鄭亞琪%吳國鋒
왕서명%장대붕%정아기%오국봉
下颌第一磨牙%Micro CT%釉质帽%牙本质核
下頜第一磨牙%Micro CT%釉質帽%牙本質覈
하합제일마아%Micro CT%유질모%아본질핵
mandibular first molar%Micro CT%enamel cap%dentin core
目的：通过人下颌第一磨牙釉质帽和牙本质核的三维重建模型，探讨其内在三维形态规律。方法：选取人下颌第一磨牙20个，采用显微CT对其进行三维扫描及重建后，在逆向工程软件中精确测量髓室各髓角至其各自相应牙本质尖、牙尖表面的距离，并同时测量其牙釉质帽、牙本质核、牙髓的体积和面积。结果：成功获得人下颌第一磨牙釉质帽与牙本质核的三维模型，测量和统计结果显示：牙本质核、牙髓组织体积和面积之间存在统计学相关（P﹤0．05），各髓角至各自相应牙本质尖的距离以远舌牙本质尖最大，依次为：远舌牙本质尖＞远颊牙本质尖＞远中牙本质尖＞近舌牙本质尖＞近颊牙本质尖，其中远舌尖、远颊尖、远中尖分别与近舌尖、近颊尖相比，差异均有统计学意义（P﹤0．05）；各髓角至各自相应牙尖的距离以远舌尖最大，依次为远舌尖＞近舌尖＞远中尖＞远颊尖＞近颊尖，各组间两两相比差异均有统计学意义（ P﹤0．05）。结论：成功获得了精确的下颌第一磨牙三维模型，并初步归纳出其牙釉质帽和牙本质核的内在三维形态规律。
目的：通過人下頜第一磨牙釉質帽和牙本質覈的三維重建模型，探討其內在三維形態規律。方法：選取人下頜第一磨牙20箇，採用顯微CT對其進行三維掃描及重建後，在逆嚮工程軟件中精確測量髓室各髓角至其各自相應牙本質尖、牙尖錶麵的距離，併同時測量其牙釉質帽、牙本質覈、牙髓的體積和麵積。結果：成功穫得人下頜第一磨牙釉質帽與牙本質覈的三維模型，測量和統計結果顯示：牙本質覈、牙髓組織體積和麵積之間存在統計學相關（P﹤0．05），各髓角至各自相應牙本質尖的距離以遠舌牙本質尖最大，依次為：遠舌牙本質尖＞遠頰牙本質尖＞遠中牙本質尖＞近舌牙本質尖＞近頰牙本質尖，其中遠舌尖、遠頰尖、遠中尖分彆與近舌尖、近頰尖相比，差異均有統計學意義（P﹤0．05）；各髓角至各自相應牙尖的距離以遠舌尖最大，依次為遠舌尖＞近舌尖＞遠中尖＞遠頰尖＞近頰尖，各組間兩兩相比差異均有統計學意義（ P﹤0．05）。結論：成功穫得瞭精確的下頜第一磨牙三維模型，併初步歸納齣其牙釉質帽和牙本質覈的內在三維形態規律。
목적：통과인하합제일마아유질모화아본질핵적삼유중건모형，탐토기내재삼유형태규률。방법：선취인하합제일마아20개，채용현미CT대기진행삼유소묘급중건후，재역향공정연건중정학측량수실각수각지기각자상응아본질첨、아첨표면적거리，병동시측량기아유질모、아본질핵、아수적체적화면적。결과：성공획득인하합제일마아유질모여아본질핵적삼유모형，측량화통계결과현시：아본질핵、아수조직체적화면적지간존재통계학상관（P﹤0．05），각수각지각자상응아본질첨적거리이원설아본질첨최대，의차위：원설아본질첨＞원협아본질첨＞원중아본질첨＞근설아본질첨＞근협아본질첨，기중원설첨、원협첨、원중첨분별여근설첨、근협첨상비，차이균유통계학의의（P﹤0．05）；각수각지각자상응아첨적거리이원설첨최대，의차위원설첨＞근설첨＞원중첨＞원협첨＞근협첨，각조간량량상비차이균유통계학의의（ P﹤0．05）。결론：성공획득료정학적하합제일마아삼유모형，병초보귀납출기아유질모화아본질핵적내재삼유형태규률。
AIM:To build up a 3-D model of human mandibular first molar by Micro CT and to reveal its morphological rule for the enamel cap and dentin core.METHODS:20 human mandibular first molars were selected and scanned by Micro CT.The morphological characteristics of enamel cap, dentin core and pulp chamber were meas-ured by the reversed engineering software individually.Both the distance of pulp horn-dentin cusp, the volume and area of each part of tooth were calculated.Statistical tool was applied for the analysis of all data.RESULTS:The vivid 3-dimensional model of enamel cap, dentin core and pulp chamber was successfully reconstructed.There was signifi-cant correlation between the dentin core and pulp chamber for either volume or area (P﹤0.05).The result of two-factor analysis of variance of the distance of pulp horn-dentin cusp showed that the distal lingual dentin cusp>distal buccal dentin cusp>distal dentin cusp>mesial lingual dentin cusp>mesial buccal dentin cusp ( P﹤0.05) .The re-sult of two-factor analysis of variance of the distance of pulp horn-dental cusp showed:distal lingual dental cusp>me-sial lingual distal dental cusp>distal dental cusp>distal buccal dental cusp>mesial buccal dental cusp (P﹤0.05). CONCLUSION:This study obtained the accurate 3-dimensional models of the mandibular first molars, and prelimi-narily summarized the enamel cap and dentin core morphological characteristics.
