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ID:62112102
大小:2.66 MB
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时间:2021-04-17
《最新国外口腔解剖乳牙.课件-药学医学精品资料.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、最新国外口腔解剖乳牙.课件-药学医学精品资料INTRODUCTIONTheworddeciduouscomesfromaLatinwordmeaningtofalloff.Deciduousteethfallofforareshedlikeleavesfromadeciduoustree.GENERALCHARACTERISTICSThedeciduousteethgenerallyhaveseveralimportantdifferencesinmorphology,composition,sizecolouraslistedbelow:1-Thedecidu
2、ousteetharesmallerthanthepermanentteeth.PRINCIPALDIFFERENCESBETWEENDECIDUOUSANDPERMANENTTEETHPRINCIPALDIFFERENCESBETWEENDECIDUOUSANDPERMANENTTEETH2-Theenamelofthedeciduousteethiswhiterandmoreopaque,whichgivesthecrownalightercolourthanthatofthepermanentteeth.3-Theenamelofthedeciduoust
3、eethismorepermeableandmoreeasilyworndown.Thedegreeofpermeabilityislessenedafterthestartofrootresorption.PRINCIPALDIFFERENCESBETWEENDECIDUOUSANDPERMANENTTEETH4-TheDEPTHOFENAMELismoreconsistentandthinnerthaninthepermanentteeth,beingfrom0.5mmto1.00mmthick.PRINCIPALDIFFERENCESBETWEENDECI
4、DUOUSTEETHANDPERMANENTTEETH5-Deciduousteethhaveapronouncedcervicalmargin.Theenamelbulges,insteadoftaperinggently,atthecemento-enamljunction,whichisstraighterthaninthepermanentteeth.Thiscervicalbulgeisaccentuatedinthemesiobuccalareaofdeciduousmolars.PRINCIPALDIFFERENCESBETWEENDECIDUOU
5、SANDPERMANENTTEETH6-Innewlyerupteddeciduousteeth,thecuspstendtobemorepointed.PRINCIPALDIFFERENCESBETWEENDECIDUOUSANDPERMANENTTEETH7-Therootsofthedeciduousteethareshorter,lessstrongandlighterincolourthanthoseofthepermanentteeth.PRINCIPALDIFFERENCESBETWEENDECIDUOUSANDPERMANENTTEETH8-Th
6、erootsofanteriordeciduousteetharelongerinproportiontothecrown.Therootsofposteriorteetharemoredivergenttoallowforthedevelopingpermanentsuccessor.Theyflareoutfromeachotherwiderthanthecrownmeasurement,andformaminimalcommonroottrunk.PRINCIPALDIFFERENCESBETWEENDECIDUOUSANDPERMANENTTEETH9-
7、Thepulpchambersarelargerthaninthepermanentteethandfollowtheexteriormorphologyofthetoothmoreclosely,theretends,thereforetobelessdepthofdentine.PRINCIPALDIFFERENCESBETWEENDECIDUOUSANDPERMANENTTEETH10-Therootcanalofdeciduousteethareveryfine.PRINCIPALDIFFERENCESBETWEENDECIDUOUSANDPERMANE
8、NTTEETH11-Us
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