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Medical Forum / General / Dentistry / November 2004Placement of margins during crown prep
Hi guys just want to know your opinions when doing an anterior crown prep. Say for example you wanted to crown UL central incisor, with a PFM. The Patient has good periodontal health. BPE in that upper central sextant is 1. Where would you place the shoulder margin on facial aspect and chamfer on palatal aspect with respect to the gingival margin? Would you place the crown just a tad bit below the gingival margin so the junction is hidden? or just at the level of the margin , or above? I suppose if you were to place it above then it would be easier to record. Thanks!! Also if anyone can point me to any sites that show this area in a bit more detail that would be great. >Hi guys just want to know your opinions when doing an anterior crown prep. > >Say for example you wanted to crown UL central incisor, with a PFM. The >Patient has good periodontal health. BPE in that upper central sextant is 1. >Where would you place the shoulder margin on facial aspect and chamfer on >palatal aspect with respect to the gingival margin? First off I would use an all ceramic crown. I use Chromatech. Next I don't ever use a shoulder, a chamfer is adequate 0.5 to 1.0 mm. Bond in place with Calibra. >Would you place the crown just a tad bit below the gingival margin so the >junction is hidden? or just at the level of the margin , or above? All ceramics show no margin. Whether supra or sub gingival. If you need metal substructure consider Captek. The bonded all porcelain restoration is much stronger than PFM. If the gingival sulcus is healtht and 1mm, I would use a full ceramic restoration without hesitation and would place the margin 0.25 or less from the gingival crest. Keep in mind that doing a single upper central incisor is quite a challenge to match to a natural incisor. Consider a custom shade or do both. Ask yourself if a stacked porcelain veneer would suffice. >I suppose if you were to place it above then it would be easier to record. > >Thanks!! > >Also if anyone can point me to any sites that show this area in a bit more >detail that would be great. Best wishes, -- W_B wubbabubbazG@RBAGEyahoo.com Take out the G'RBAGE |
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