山东地区汉族青、少年第一前磨牙解剖形态测量的观察.pdf

rl I IlrlIlll／rll f』／lllll l l[f |Y1734278 及女性下颌第一前磨牙根分叉多数位于根尖I／3处，男性下颌第一前磨牙根分叉多 位于根中l／3处；男性和女性下颌第一前磨牙及女性上颌第一前磨牙牙根多向远中 弯曲，其次为直根；男性上颌第一前磨牙牙根多为直根，其次为远中弯曲根。 3、山东地区汉族青、少年上颌第一前磨牙多有2个根尖开口，下颌第一前磨牙 多有1个根尖开口；根尖开口位于根尖顶点和非项点者约各占半数；根尖开口的形 态以圆形和椭圆形多见。 研究生 官群立 口腔内科学 导师 邓婧教授 关键词：第一前磨牙； 解剖形态；测量 Abstract andmeasurethe ofthefirst Objective：Toinvestigate morphologypermanentpremolars ofHan and in and anatomicdataand basis youthjuniorShandongregionprovide therapy forclinical andscientificresearchin of treatment，education departmentStomatology． Methods：Onehundredand six extractedfirst of fortyfreshly permanentpremolarsyouth for8 and in werecollectedand andsex juniorShandongregion groupedbyposition groups． measured totheestablished the 1、Theteethwere according method，including of ofdental ofdental ratioof ofdental tooth，heightcrown，lengthroot，the height length crownand ofdentfl ofdental ofdental ratioof length root，width crown，widthneck，the widthofdentalcrownandwidthofdental ofdental ofdental neck，depth crown，depth crownand ofdental areaofdentalcrown ratioof ofdental neck，the depth depth neck，the transection．Thenthedatawere theSPSSsoftware analyzedusing package． 2、The observationsweremadenaked root root following by eyes：thetype，the andthe oftherootbranchofthefirst shape place permanentpremolars． weremaderootcanal 3、The observations number,the following by microscope：the andthe ofrootforamina． shape position Results： 1、 Anatomicdataofthefirst ofHan and in permanentpremolarsyouthjunior each ratioof ofdentalcrownand wereobtained．In height Shandongregion group，the ofdentalroothadthe coefficientofvariationandtheratioof of length biggest depth dentalcrownand ofdentalneckhadthesmallestcoefficientofvariation．Theresult depth and of oft-testwasthattheanatomicdatabetweenthe leftfirst right permanentpremolars thesamesexhadnostatistical anatomicdataofthe maxillary significance P 0．05 ；some ormandibularfirst betweenthedifferentsexhadstatistical permanentpre