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  • Selection of cast and...

Selection of cast and wrought-wire clasps for removable partial dentures: Guideline

Dr. Shravani DaliWritten by Dr. Shravani Dali Published On 2022-02-10T09:00:15+05:30  |  Updated On 2022-02-10T09:00:33+05:30
Selection of cast and wrought-wire clasps for removable partial dentures: Guideline
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A set of guidelines for the selection of cast and wrought-wire clasps for suggested that combinations of clasp material and undercut that would exert the maximum retentive force without deformation were the most effective, as published in the International Dental Journal. The aim of this study was to establish guidelines for the selection of cast and wrought-wire clasps for...

A set of guidelines for the selection of cast and wrought-wire clasps for suggested that combinations of clasp material and undercut that would exert the maximum retentive force without deformation were the most effective, as published in the International Dental Journal.

The aim of this study was to establish guidelines for the selection of cast and wrought-wire clasps for removable partial dentures (RPDs) that would be appropriate for clinically encountered undercuts and facial curvatures.

Randomly selected discarded casts were collected and 30 premolars and 30 molars were surveyed, sectioned to a line representing the clasp and scanned using a flatbed scanner. The average clasp curvature and length for each group was determined and a three-dimensional model was printed, to which wrought wire clasps of 0.9- and 1.0-mm diameter were adapted. Standard wax clasp patterns were adapted and cast in a stellite alloy. Each clasp was deformed beyond its proportional limit; and the forces exerted at that limit and at deflections of 0.25 mm, 0.5 mm, and 0.75 mm were measured, and a safety limit was calculated that would ensure elastic deformation at the required undercuts.

Results:

A table was produced with guidelines for those clasps that would provide the highest retentive force within the proposed safety limit. The highest forces were provided by cast clasps in a 0.25-mm undercut. Wrought round wire of 1-mm diameter provided the next highest retentive forces, in a 0.25-mm undercut for premolar clasps arms and 0.5-mm for molar clasps.

The results provide valid guidelines for the use of combinations of clasp material and undercut that would exert the maximum retentive force without deformation for both short (premolar) as well as long (molar) clasps, for wrought and cast clasps.

Reference:

Guidelines for the choice of circumferential wrought wire and cast clasp arms for removable partial dentures by C. Peter Owen et al published in the International Dental Journal.

https://doi.org/10.1016/j.identj.2021.01.005


Removable partial denture Clasps Undercuts Forces Safety limit Guidelines International Dental Journal 
Source : International Dental Journal
Dr. Shravani Dali
Dr. Shravani Dali

    BDS

    Dr. Shravani Dali has completed her BDS from Pravara institute of medical sciences, loni. Following which she extensively worked in the healthcare sector for 2+ years. She has been actively involved in writing blogs in field of health and wellness. Currently she is pursuing her Masters of public health-health administration from Tata institute of social sciences. She can be contacted at editorial@medicaldialogues.in.

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