Term
| what provides a temporary wall for restorations in order to replace missing proximal surfaces (mesial or distal or both)? |
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Definition
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Term
| what classes of restorations may require a matrix band? |
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Definition
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Term
| what does a matrix band do ? |
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Definition
(1) serves as replacement wall during insertion of restorative material
(2) restores proper contour to tooth surface
(3) restores proper contact to tooth surface |
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Term
| what is the function of the universal or tofflemire retainer? |
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Definition
| it holds the matrix band in position |
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Term
| where is the universal or tofflemire retainer positioned most commonly? |
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Definition
| from the buccal surface of the tooth being restored |
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Term
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Definition
| thin flexible stainless steel |
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Term
| what are the two common designs for matrix bands? |
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Definition
(1) universal
(2) extension |
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Term
| what are the guidelines for placement of the matrix band? |
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Definition
(1) the larger circumference is the occlusal edge
(2) the smaller circumference is the gingival edge |
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Term
| what shapes and materials do wedges come in? |
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Definition
| plastic or wood and round or triangle |
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Term
| where are wedges positioned? |
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Definition
| into the lingual embrasure or class II preparations after band placement |
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Term
| when should we use a wedge? |
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Definition
| it is required when using a matrix band with adjacent tooth |
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Term
| why should we use a wedge? |
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Definition
(1) helps to restore proper contour to tooth
(2) helps to restore proper contact to tooth
(3) helps to prevent gingival amalgam overhang |
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Term
| how should you place the wedge? |
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Definition
(1) base of wedge goes to gingiva
(2) apex of wedge goes to occlusal
(3) placed with hemostat or cotton plies
(4) usually placed from lingual on posterior teeth
(5) placed on opposite side of prep on anterior teeth |
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Term
| does the solid side of the box on the matrix retainer go toward the gingival or the occlusal? |
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Definition
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Term
| when should the right guide channel be used? |
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Definition
| in the (1) maxillary right quadrant or (2) mandibular left quadrant |
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Term
| when should the left guide channel be used? |
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Definition
| in the (1) maxillary left quadrant or (2) mandibular right quadrant |
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Term
| which arch does the channel match? |
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Definition
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