what exactly is cavo-surface margin? unsupported enamel?

Discussion in 'Dental' started by ichitaka86, Jul 1, 2010.

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  1. ichitaka86

    ichitaka86 7+ Year Member

    Jun 10, 2008
    I'm really sorry for this question but I just can't get around with the above definitions. Maybe I wasn't paying enough attention in class :(

    Can anyone illustrate with some diagrams?
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  3. Vapor1122

    Vapor1122 10+ Year Member

    Oct 27, 2006
    cavosurface margin = basically any junction of cut/uncut enamel in a cavity prep
  4. cuspofcarabelli

    cuspofcarabelli 2+ Year Member

    Apr 12, 2010
    CSA- is the junction between the prepared &the unprepared surface of a tooth ( the same thing that vapor 1122 said)- dont get frustrated, u ll understand better when u start cutting ( cavity preparation)- if u r a freshmen, well u ll get the concept better on ur sophomore year. do not panic..
  5. Vicviper

    Vicviper Steve McAwesome 7+ Year Member

    Nov 19, 2008
    Visalia, CA
    Unsupported enamel is like, this:


    See how in the second picture, there is no dentin under part of the enamel layer on the occlusal? Because of this, it will fracture easily under normal occlusal forces. Hope that helped!
  6. xhamburgersamx

    xhamburgersamx 2+ Year Member

    Jun 26, 2008
    unsupported enamel is basically any area that is undercut leaving enamel unsupported by dentin
  7. sokrman14

    sokrman14 2+ Year Member

    Jun 21, 2010
    Cavosurface is where the internal structure of your prep meets the external portion of the tooth that you haven't cut.

    Unsupported enamel is when the enamel has no dentin immediately underneath it.
  8. Stephie3

    Stephie3 2+ Year Member

    Nov 1, 2008
    cavosurface margin is just the outline of the prep you've cut when you look down on the tooth's occlusal surface.

    unsupported enamel is exactly like it sounds....enamel that is not supported by dentin. if enamel is hanging over the edge and there is no dentin underneath it, then you have unsupported enamel. the reason why they will make you diverge and converge the walls of your prep is to avoid this.

    when enamel is not sitting on top of any dentin, then its going to be weak and the piece of enamel may fracture off.

    at my school undermined enamel is an automatic failure...dont do it. ;)

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