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29 Cards in this Set
- Front
- Back
Define Cavosurface Margin
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The line that is formed by the junction of a cavity wall and the external surface of the tooth
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Define Cavity Wall
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The surfaces within the cavity preparation, the wall takes the name of the suface of the tooth adjoining the surface involved
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Define Pulpal Wall (floor)
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Wall that is occlusal to pulp and in a plane prependicular to the long axis of the ooth. There are no pulpal walls on Class III, IV, or V (horizontal plane)
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Define Sub-Pulpal Wall (floor)
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In a tooth from which the pulp has been removed and cavity extends to floor of the pulp chamber. In a prepared cavity where a portion of the pulpal wall is below the major established pulpal wall.
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Define Axial Wall
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Wall that is parallel to long axis of the tooth. This wall along with the pulpal surround the pulp.
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Define Line Angle
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The junction of two wall along a line and is named for the joining surface
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Define Point angle
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The junction of 3 walls of a point and is named for the joining surfaces
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Define Gingival Floor (Wall)
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Wall that is perpendicular to axial wall and located most apically
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Proximal Cavity Wall
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Names the wall that has been cau away like in Class II prep. Below the pulpal floor in the "proximal step or box" (B proximal wall, L proxiamal wall)
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What is the 1st element of cavity design?
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Establish the outline form.
It is the form of the area of the tooth surface to be included, within the outline, or margin walls, of the prepared cavity. |
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T or F. The outline form is the CAVOSURFACE MARGIN of the finished prep
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True
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What are the 3 fundamental principles that determine the outline form?
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1. Extension for Prevention
2. Enamel Walls Supported by Sound Dentin 3. Smooth and Flowing Curves of the Cavity Prep Margins |
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What is "extension for prevention" principle that determine the ooutline form?
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Extending the margins of the cavity preparation into areas that are readily cleansed by the tongue, lips, cheek, saliva brushing and chewing. This prevents recurrent decay.
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What is "enamel walls supported by sound dentin" principle that determine the outline form?
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The walls of the cavity prep must be extended until sound dentin is reached because enamel is brittle.
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T or F. Some enamel is not supported by sound dentin
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False
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Whst is "smooth and flowing curves of the cavity prep" about?
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In order to finish the margins, we need the margins to be smooth and flowing. It is impossible to finish the margins of a jagged outline
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What is the second element of cavity design?
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Obtaining the required resistance & retention form
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In resistance and retention form, what is resistance for?
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This form allows the future restoration to withstand the forces and stresses of bite. Ex: utilize a box shape with a flat pulpal wall. This provides the bulk necessary for strength.
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What is the "retention form" or the resitance and retention form from the 2nd element of a cavity design?
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Thisis needed to hold the restoration in place against the pull of sticky foods and cheweing forces. Ex: a dove tail is a widened or fanned out portion of a prepared cavity to increase retention form.
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What is the 3rd element of cavity design?
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Obtaining the required convenience form or access form
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What is the Convenience form of the elements of cavity design about?
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This form is obtained by moderate extension of the cavity walls. This is sometimes necessary because the original walls of the cavity do not permit the space and access necessary to carry out the restorative procedures.
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What is setp 4 in elements of cavity design?
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Removal of carious dentin
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What is the 4th stage of cavity design all about?
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If carious dentin is still present after the 1st three stages, it must be completely removed at this stage.
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T or F. Removal of carious dentin is done by a round bur only.
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False, it can also be done by a spoon excavator
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What is step 5 of elements of cavity design? What is it's purpose?
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Finishing the enamel walls. The enamel walls must be made up of full length enamel rods suppoerted by sound dentin.
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Enamel walls are finished by first _ the enamel. Any remainng irregularities are removed by ___ the enamel walls with a sharp hand instrument.
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Cleaving, Planing
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Which instruments can be used in cleaving the enamel?
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a fissure bur or and sharp hand instrument, such as the enamel hatchet.
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What is the weakest part of the enamel?
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The cementing substance that holds the rods together.
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T or F. The goal of cleaving the enamel is to assure a wall that is composed of full length enamel rods.
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True
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