| Roach clasp | A clasp whose arms are bar-type extensions from major connectors or from within the denture base; the arms pass adjacent to the soft tissues and approach the point of contact on the tooth in a gingivo-occlusal direction, a clasp consisting of two or more separate arms located opposite to each other on the tooth; the bar arms arise from the framework or from a connector and may traverse the soft tissue; one arm (bar), the retentive arm, usually terminates in the infrabulge (gingival convergence) area of the tooth; the other, the reciprocal arm, usually terminates on the suprabulge (occlusal convergence) area. Synonym: Roach clasp. (05 Mar 2000) |
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| roach | <zoology> A cockroach. 1. <zoology> A European fresh water fish of the Carp family (Leuciscus rutilus). It is silver-white, with a greenish back. An American chub (Semotilus bullaris); the fallfish. The redfin, or shiner. 2. A convex curve or arch cut in the edge of a sail to prevent chafing, or to secure a better fit. As sound as a roach [roach perhaps being a corruption of a F. Roche a rock], perfectly sound. Origin: OE. Rroche; cf. AS. Reohha, D. Rog, roch, G. Roche, LG. Ruche, Dan. Rokke ray, Sw. Rocka, and E. Ray a fish. Source: Websters Dictionary (01 Mar 1998) |
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| roach-backed | Having a back like that of roach; said of a horse whose back a convex instead of a concave curve. Source: Websters Dictionary (01 Mar 1998) |
| Roach, F Ewing | <person> U.S. Prosthodontist, 1868-1960. See: Roach clasp. (05 Mar 2000) |
| bar clasp | A clasp whose arms are bar-type extensions from major connectors or from within the denture base; the arms pass adjacent to the soft tissues and approach the point of contact on the tooth in a gingivo-occlusal direction, a clasp consisting of two or more separate arms located opposite to each other on the tooth; the bar arms arise from the framework or from a connector and may traverse the soft tissue; one arm (bar), the retentive arm, usually terminates in the infrabulge (gingival convergence) area of the tooth; the other, the reciprocal arm, usually terminates on the suprabulge (occlusal convergence) area. Synonym: Roach clasp. (05 Mar 2000) |
| bar clasp arm | A clasp arm which has its origin in the denture base or major connector; it consists of the arm which traverses but does not contact the gingival structures, and a terminal end which approaches its contact with the tooth in a gingivo-occlusal direction. (05 Mar 2000) |
| retentive circumferential clasp arm | An arm that is flexible and engages the infrabulge at the terminal end of the arm. (05 Mar 2000) |
| circumferential clasp | A clasp that encircles more than 180 |
| circumferential clasp arm | A clasp arm which has its origin in a minor connector and which follows the contour of the tooth approximately in a plane perpendicular to the path of insertion of the partial denture. (05 Mar 2000) |
| clasp | 1. A part of a removable partial denture that acts as a direct retainer and/or stabiliser for the denture by partially surrounding or contacting an abutment tooth. 2. A direct retainer of a removable partial denture, usually consisting of two arms joined by a body which connects with an occlusal rest; at least one arm of a clasp usually terminates in the infrabulge (gingival convergence) area of the tooth enclosed. (05 Mar 2000) |
| clasp arm | A portion of a clasp of a removable partial denture which projects from the clasp body and helps retain the partial denture in position in the mouth. See: clasp. (05 Mar 2000) |
| clasp guideline | A line scribed on an abutment tooth of a dental cast by means of a dental surveyor indicating the height of contour of the tooth according to a specific path of insertion, a line which serves as a guide in the proper location of various parts of a clasp assembly for a removable partial denture. Synonym: clasp guideline, Cummer's guideline. (05 Mar 2000) |
| clasp-knife effect | Initial increased resistance to stretch of the extensor muscles of a joint that give way rather suddenly allowing the joint then to be easily flexed; the rigidity is due to an exaggeration of the stretch reflex. See: lengthening reaction. Synonym: clasp-knife effect, clasp-knife rigidity. (05 Mar 2000) |
| clasp-knife rigidity | Initial increased resistance to stretch of the extensor muscles of a joint that give way rather suddenly allowing the joint then to be easily flexed; the rigidity is due to an exaggeration of the stretch reflex. See: lengthening reaction. Synonym: clasp-knife effect, clasp-knife rigidity. (05 Mar 2000) |
| clasp-knife spasticity | Initial increased resistance to stretch of the extensor muscles of a joint that give way rather suddenly allowing the joint then to be easily flexed; the rigidity is due to an exaggeration of the stretch reflex. See: lengthening reaction. Synonym: clasp-knife effect, clasp-knife rigidity. (05 Mar 2000) |
| continuous clasp | A metal bar, usually resting on lingual surfaces of teeth, to aid in their stabilization and to act as indirect retainer's. Synonym: continuous clasp. (05 Mar 2000) |