最新华西口腔课件-修复理想桥基牙教学讲义ppt课件.ppt

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1、华西口腔课件-修复理想桥基牙Theidealabutmenttoothcontainsavitalpulp.Ifmostnotbeinferredfromthisthatatreatedtoothwithaproperlyfilledrootcanalisnotsuitableasabridgeabutment;clinicalevidenceindicatesthatinproperlyselectedcasessuchtreatedteethhaverenderedyearsofvaluableservicetothepatientwithouta

2、nyharmfuleffects.Nevertheless,thefirstrequisiteinpreparingvitalteethforthereceptionofbridgeretainersispulpconservation.理想的基牙应该是活髓牙。大多数情况下不能这样推断：完善根管治疗后的牙齿不适合作基牙。临床证据表明合理选择的病例中这样的牙齿可以在患者体内服役很多年，没有任何危害。但对作为承担桥固位体的活髓牙来讲，首先要必须考虑的就是保存活髓。2Everyeffortshouldbemadeduringthecuttingoperati

3、onstoavoidoverheatingorirritatingthepulpinordertopreventitsfuturedegenerationordeath.Thosepreparationsarecontraindicatedwhichbringtheretainertooclosetothepulp,thusexposingittocontinuousthermalshocks;ifexistingconditionsindicatetheprobabilityofsuchanoccurrence,everypercautionshou

4、ldbetakentoreducethedangertoaminimum.在牙体预备时应该尽一切努力来避免过热或激惹牙髓，其目的是预防以后的牙髓变性或坏死。这些牙体预备是不当的，使固位体过于接近牙髓，这样就使牙髓会受连续的热刺激；如果存在的现象表明有可能会出现这样的情况，应该非常的小心来将这种危险减少到最小。3Inoperativedentistrycavitiesarepreparedprimarilytoreceivefillingswhichrestorethatpartofthetoothlostbecariesoraccident.Infix

5、edpartialdentureprosthesisalargeproportionoftheteethreceivingbridgeretainersaresoundandnoncarious;occasionallyamonocarioustoothisused.Polycariousteeth,thosewithmorethanonecariouslesion,areoftenrestoredwithacompletecrowninsteadofwiththeintracoronalorpartialveneertypeofretainers.T

6、helocationofacavityinanabutmenttoothisalsoadeterminingfactor.有效的牙齿洞型被预备主要是放充填物，而充填物则用来修复因龋坏或意外原因而丢失的部分牙体组织。在固定义齿修复体中很多粘接桥固位体的牙齿是完整无龋坏的；多龋的牙齿有不止一个的龋损，通常用全冠而不是冠内或部分的贴面类型的固位体。基牙上龋洞的位置也是一个决定性的因素。7QuestionableabutmentWhilemostabutmentscanberestoredwithcompletecrowns,theemploymentofin

7、tracoronalorpartialveneertypeofretainershasdefinitelimitations.Beforeapprovingatoothtoserveasanabutment,itsdegreeofcalcificationshouldbeestablished;enamelthathasnotbeenproperlycalcified,butthatissoftandchalky,willnotfurnishasuitablewallagainstwhichthemarginofthecastingmaybefinis

8、hed.Someteethhaveopalescentdentin;thesearequest