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The difference between the pull back snap ring and the rod snap ring

by:Tronshal     2022-03-19
Pull-back clasp is often used for missing free ends of posterior teeth, abutment teeth are premolars or canines, and crowns are short or tapered. The characteristic of pull-back clasp is that the tip of the clasp arm is located in the undercut area of u200bu200bthe labial (buccal) side of the abutment tooth. , bypass the distal surface of the abutment to connect with the (occlusal) rest, then turn to the non-undercut area on the lingual side to form an antagonistic arm, and connect with the palatal (lingual) rod on the mesial and lingual side of the abutment through a small connector. If the tip of the clasp arm is located in the lingual undercut area of u200bu200bthe abutment (severe lingual inclination of the mandibular abutment), the clasp arm is connected to the distal (occlusal) rest and turned to the buccal side, passing through a small connector mesially Connected with the base metal bracket, it is called the anti-return force snap ring. Both are cast snap rings. Since the distal (occlusal) rest is not directly connected to the base, the lifting force is first transmitted to the mucosa and alveolar ridge through the artificial teeth and base, and then migrates back to the abutment. This relieves the load on the abutment and has a stress interrupting effect. Rod-shaped snap rings are made by casting and are available in various forms such as U-shaped, T-shaped, I-shaped, L-shaped, etc. UUUU-shaped snap ring: It is in point contact with the undercut area of u200bu200bthe buccal surface of the abutment. It is suitable for the abutment with a long crown. The observation line is biased towards the eye, and there is an appropriate undercut at the corner of the mesial or distal line. TTTT-shaped clasp: It is the most commonly used form of rod clasp, with good elasticity, and is often used for a removable partial denture with a missing distal extension, but this type of clasp tends to accumulate food and expose metal. IIII-shaped clasp: It is in point contact with the undercut area of u200bu200bthe buccal surface of the abutment, with good elasticity, less exposed metal, more beautiful, and no food impaction, but there must be an opposing arm on the lingual side. LLLL-shaped snap ring: It is in point contact with the undercut area of u200bu200bthe buccal surface of the abutment, with good elasticity and easy cleaning. There are many shapes and types of rod-shaped snap rings, and they are widely used. Its main advantages are good elasticity, small contact surface with the abutment, strong retention, little damage to the abutment, less exposed metal, beautiful appearance, and the abutment can be maintained. Physiological exercise. Its main disadvantage is that the stabilization effect is not as good as that of the annular snap ring, which is easy to accumulate food and difficult to repair after damage.
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