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contraction thermique, retrait au refroidissement |
contraction, thermal |
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creux, recessus, rétraction, retrait |
recession |
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| a moving back or withdrawal. |
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partie en retrait formant rétention |
undercut, retentive |
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| an area of the abutment surface suitable for the location of a retentive clasp terminal, which in order to escape the undercut would be forced to flex and thus generate retention. |
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partie en retrait, partie non de dépouille, undercut, zone rétentive |
undercut |
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| 1. the portion of a tooth that lies between its height of contour and the gingivae, only if that portion is of less circumference than the height of contour. 2. the contour of a cross-section of a residual ridge of dental arch that would prevent the placement of a denture or other prosthesis. 3. the contour of flasking stone that interlocks to prevent the separation of parts. 4. the portion of a prepared cavity that creates a mechanical lock or area of retention; may be desirable in a cavity to be filled with gold foil or amalgam but is undesirable in a cavity prepared for a restoration to be cemented. |
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rétraction, retrait |
shrinkage |
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| 1. reduction or decrease in extent or quantity. 2. reduction in volume. |
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retrait de coulée, ~ à la coulée |
casting shrinkage |
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| volume change (contraction) that occurs when molten metal solidifies after being cast into a pattern mold. It is compensated for in three ways: by using the indicated water:powder ratio for the refractory investment to gain the maximal setting expansion of which that investment is capable; by exposing the investment to moisture as the refractory investment sets, causing some hydroscopic expansion; and by properly heating the mold to achieve thermal expansion. The total expansion must equal the contraction of the metal being cast. |
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retrait gingival, rétraction de la gencive |
gingival retraction; gingival recession; gum recession; gingival abrasion; ulatrophia |
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| the apical migration of the gingival crest. atrophy of the gingival margin associated with inflammation, apical migration (proliferation) of the epithelial attachment, and resorption of the alveolar crest. |
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tissu mou présentant une partie en retrait |
undercut, soft tissue |
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| an undercut in a residual ridge or soft-tissue covering of a dental arch that would prevent or influence the placement of a removable denture. |
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