Term
| Matrix bands are often used for on buccal or lingual extensions (DEJ). It is most common on molars, why is this. |
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Definition
| It is due to caries or deeply fissured grooves. Most common is buccal extensions for mandibular molars and lingual extensions for maxillary molars. |
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Term
| A tofflemire band is placed into a matrix holder. The matrix band is placed in such a manner so that the smallest diameter points....... |
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Definition
| the smallest diameter is toward the gingiva when the band is placed. |
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Term
| What Hoes are used in a DLG prep? |
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Definition
the
#6-1/2x2-1/2x9
#1-4-8 |
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Term
| What type of Latch burs are used in a DLG prep? |
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Definition
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Term
| What Burs are used in a DLG prep? |
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Definition
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Term
| The occlusal portion of a DLG has two walls. What ridges are found behind the prep wall. (one distal side of prep and one mesial to prep) |
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Definition
Distally- The Distal Marginal Ridge
Mesially- the oblique ridge |
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Term
| how far distal should the distal wall of the occlusal portion of a DLG prep be placed? |
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Definition
| Half way between the distal pit and the distal marginal ridge. |
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Term
| How far is the mesial wall of the occlusal portion of a DLG prep extended? |
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Definition
| Wall will terminate half way between the Groove(Groove that make DLG) and the oblique ridge. |
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Term
| The book refer's to the distal wall on the occlusal surface as the Distal marginal ridge wall. What is the angle of this wall? |
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Definition
| Wall forms a slightly obtuse angle with the pulpal wall, to prevent weakening of the marginal ridge |
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Term
| What is the M-D width of a DLG outline? |
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Definition
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Term
| DLG- What is the depth of the pulpal wall? |
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Definition
| depth which allows pulpal line angles to be placed in sound dentin |
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Term
| DLG-Depth/extension of Axial wall? |
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Definition
| Axial wall must be in .5 mm of sound dentin, allowing for placement of retentive grooves |
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Term
| The DLG is essential what "class" of a prep? |
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Definition
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Term
| DLG- What is the minimum distance Distally and mesially of each wall from the distal groove? |
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Definition
| Total prep is a minimum of 1 mm so each wall extends .5 in each direction |
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Term
| DLG- following the groove from the occlusal surface down to the lingual. The lingual groove should shift no more then.....how many mm? |
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Definition
| No more then .5 of a shift. (think about how we angle the bur) |
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Term
| DLG- is the gingival floor wider then the rest of the prep of the lingual surface? |
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Definition
| No, should not diverge or widen at the gingiva. |
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Term
| DLG- what dictate's the depth of the pulpal floor? |
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Definition
| Must be slightly in sound dentin, usually take 1.5 mm from surface to achieve . |
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Term
| DLG- The pulpal floor inclines in what direction? |
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Definition
| Pulpal wall will incline toward the lingual, because the dento-enamel junction curves. |
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Term
| DLG- what is the depth of the axial wall? |
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Definition
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Term
| DLG- the axial wall of the prep leans in, toward the occlusal, why? |
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Definition
| This is toward the lingual incline of the lingual cusp |
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Term
| The pulpo axial line angle is rounded, Why? |
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Definition
| conformes to the curvature of the dento-enamel junction. (portion where you move from occlusal to lingual) |
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Term
| DLG- direction of the distal wall. |
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Definition
| On occlusal is slightly undercut. On the lingual portion, it is 90 degrees to the surface of the tooth |
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Term
| DLG-direction of buccal wall? |
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Definition
| slightly divergent, preserves strength of the Distal Buccal cusp |
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Term
| DLG-Mesial wall or oblique ridge inclination? |
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Definition
| 90 degrees to long axis of tooth of slightly undercut. On the lingual portion it is 90 degrees |
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Term
| DLG- what is the inclination the the distal wall of the lingual portion of the prep? |
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Definition
| none. needs to be 90 degrees to external surface. So straight |
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Term
| Lingual extension-describe the gingivo axial line angle. |
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Definition
| The gingivo axial line angle is curved and accentuated to form an undercut that is continuous with the retentive features |
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Term
| The DLG prep is most similar to which other type of prep? |
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Definition
| It is essentially a class 1 that has been folded over |
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Term
| DLG- how do you round the gingival extension? |
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Definition
| the bur is held at a right angle to the external surface to the tooth. |
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Term
| When do use a 33-1/2 inverted cone bur? |
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Definition
| To form internal retentive features of the lingual extension |
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Term
| DLG- how far up do you extend the retentive grooves? |
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Definition
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Term
| DLG- The mesial and distal walls of the lingual extensions are slightly flared with which steel bur? |
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Definition
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