pinhole retention

pinhole retention

Etymology: ME, pyn + hol + L, retinere, to hold

retention developed by drilling one or more holes, 2 to 3 mm in depth, in suitable areas of a cavity preparation to supplement resistance and retention form.

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retention (rēten´shn),

n 1. power to retain; capacity for retaining; the inherent property of a restoration to maintain its position without displacement under stress; results from close adaptation of the restoration to the prepared form of the tooth, usually aided by cement.
n 2. term relating to the provision in cavity preparation for preventing displacement of a restoration. Retention supplements resistance form and is specifically created to resist any lateral or tipping force that may be brought against the restoration during and after its insertion.
n 3. resistance of a denture to removal in a direction opposite that of its insertion; the quality inherent in the denture that resists the force of gravity, adhesiveness of foods, and forces associated with the opening of the jaws.
n 4. the period of treatment during which the individual wears an appliance to maintain the teeth in the desired position.

retention arm,

n See arm, retention.

retention, circumferential,

n frictional resistance to displacement derived from completely veneering the exposed tooth surface.

retention, denture,

n 1. the means by which dentures are held in position in the oral cavity; the maintenance of a denture in its position in the oral cavity; the resistance to the movement of a denture from its basal seat in a direction opposite to that in which it was inserted.
n 2. the resistance of a denture to vertical movement in the occlusal direction from its basal seat.

retention, direct,

n retention obtained in a removable partial denture by the use of attachments or clasps that resist removal from abutment teeth.

retention form,

n See form, retention.

retention, indirect,

n retention obtained in a removable partial denture through the use of indirect retainers.

retention, partial denture,

n the fixation of a fixed partial denture by means of crowns, inlays, or other retainers.

retention, pin,

n See pin, retention.

retention, pinhole,

n one or more small holes, 2 to 3 mm in depth, placed in suitable areas of a cavity preparation parallel with the general line of draft to provide or supplement resistance and retention form.

retention, radicular,

n retention derived from projections of metal into the root canals of pulpless teeth.

retention, removable partial denture,

n the resistance to movement of a removable partial denture from its supporting structures, gained by the use of direct and indirect retainers or other attachments.

retention terminal,

n See clasp, circumferential arm; clasp, circumferential, arm retentive.