What is retentive clasp?
The part of the clasp assembly that enters an undercut for retention is frequently called the RETENTIVE CLASP ARM. An ATTACHMENT is a mechanical device for the fixation, retention, and stabilization of a prosthesis (Fig.
In which area of the crown the retentive clasp tip should be placed?
7. Reciprocal elements of the clasp assembly should be located at the junction of the gingival and middle thirds of the crowns of abutment teeth. The terminal end of the retentive arm is optimally placed in the gingival third of the crown.
What is depth of retentive clasp arm in undercut?
A retentive clasp should engage 0.5 mm of the undercut if it is constructed of wrought wire. A wrought wire clasp is more flexible than a comparable design of cast clasp in Co- Cr alloy; and therefore, needs to engage a greater depth of undercut to generate equivalent retention.
What is Embrasure clasp?
An embrasure clasp is part of a partial denture used where no edentulous space exists, which, having passed through the embrasure, engages the undercut area of the tooth surface. An occlusal embrasure is the space between the curved proximal surfaces of the teeth which opens towards the occlusal surface.
What is the function of the retentive arm?
Rests anterior to the retentive fulcrum line, with their minor connector, provide indirect retention, (2) the retentive clasp arm provides retention and sometimes some bracing, (3) the reciprocal component may be a clasp arm, minor connector or plate and serves the function of reciprocation, bracing, and frictional …
Where is retentive arm located?
7. Reciprocal elements of the clasp assembly should be located at the junction of the gingival and middle thirds of the crowns of abutment teeth. The terminal end of the retentive arm is optimally placed in the gingival third of the crown (Figures 7-4 through 7-6).
What is prosthodontic clasp?
A combination clasp is a circumferential retainer for a removable dental prosthesis that has a cast reciprocal arm and a wrought wire retentive clasp (GPT8). It consists of a wrought wire retentive arm and a cast reciprocal arm. The combination of a wrought alloy and cast alloy gives it the name ‘combination clasp’.
When do you use an Embrasure clasp?
Embrasure clasp This design is most frequently used in cases of unilateral edentulous span of an unmodified Kennedy Class II or Class III partial denture, on the side of the arch where there is no edentulous space.
What is Tripoding a cast?
Tripod. markings are lines or marks drawn on a cast in a plane. perpendicular to the survey rod to assist in repositioning. the cast on a dental surveyor.2 The most straightforward. method consists of placing 3 cross marks on the tissue.