Effect of clasp design upon retention of removable partial dentures

Firtell, David N.

doi:10.1016/0022-3913(68)90211-4

Cited by 33 publications

(22 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results of retention force before cycling were in agreement with previous studies 1,2,4 . Firtell 1 found that the retention force of the E‐clasp was about 13.7 N and 1.6 N for the back‐action clasp.…”

Section: Discussionsupporting

confidence: 91%

“…Firtell 1 found that the retention force of the E‐clasp was about 13.7 N and 1.6 N for the back‐action clasp. Bates 2 obtained similar results in a similar experiment; however, Soo and Leung 4 reported that the retention force of Aker's clasp was 17.5 N. The results of retention force before cycling were in agreement with previous studies 1,2,4 …”

Section: Discussionmentioning

confidence: 99%

“…Sufficient retention of removable partial dentures (RPDs) is considered one of the most important factors affecting their clinical success. Many studies have investigated the effect of clasp design on retention force 1–4 . Retention of RPDs is accomplished by placing clasp parts into undercuts on abutment teeth.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Effects of Long‐Term Simulated RPD Clasp Attachment/Detachment on Retention Loss and Wear for Two Clasp Types and Three Abutment Material Surfaces

Helal

Baraka

Sanad

et al. 2012

Journal of Prosthodontics

View full text Add to dashboard Cite

show abstract

Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Long‐Term Simulated RPD Clasp Attachment/Detachment on Retention Loss and Wear for Two Clasp Types and Three Abutment Material Surfaces

Helal

Baraka

Sanad

et al. 2012

Journal of Prosthodontics

View full text Add to dashboard Cite

show abstract

“…Research into the retentive properties of clasps has concentrated on fatigue and on the retentive effects of different clasp designs (Firtell 1968;Snyder and Duncanson 1992;Vallittu 1996;Gapido et al 2003). Fatigue occurs as a result of repeated loading cycles during the insertion and fixation of RPDs.…”

Section: Discussionmentioning

confidence: 99%

Finite element analysis of stress distribution on modified retentive tips of bar clasp

Oyar

Soyarslan²,

Can³

et al. 2012

Computer Methods in Biomechanics and Biomedical Engineering

View full text Add to dashboard Cite

This study used finite element analysis to evaluate the retentive tips of bar clasps made from different alloys and using different designs in order to determine whether or not different materials and tip forms are suitable for bar clasp applications. Co-Cr, Ti and Type IV Au alloys were selected based on their physical and mechanical properties. The 3D finite element models of three different bar clasp retentive tip geometries prepared from Co-Cr, Ti and Type IV Au alloys were constructed using the finite element software package MSC.Marc. Analysis of a concentrated load of 5 N applied to the removable partial denture approach arms in an occlusal direction was performed. Although stress distribution and localisation within bar clasps with different retentive tips were observed to be similar and were concentrated in the approach arm, stress intensities differed in all models.

show abstract

“…Dr D.X. Firtell," in 1968, made an experimental model that simulated an abutment tooth. Castings ofvarious clasps were then Lested to de terrriine the amount of forcc required to dislodge them.…”

mentioning

confidence: 99%

Clasp Retention: The Effects of Five Variables

LaVere

1993

Journal of Prosthodontics

View full text Add to dashboard Cite

An attempt was made to determine the relative retention of each of the four most commonly used clasp assemblies. They are the rest, proximal plate, I bar (RPI); rest, proximal plate, facial circumferential arm (RPA); modified T; and Akers (facial and lingual circumferential arms). A mandibular bilateral distal extension base removable partial denture design was selected because it is most commonly used. A test model was made by removing all mandibular molars from a Columbia Dentoform and replacing the ivorine second bicuspids with natural teeth. These, in turn, were later replaced with gold crowns that were identical in contour to the natural teeth. Eight removable partial dentures were constructed using preformed plastic lingual bars, minor connectors, denture base retention loops, and clasps. Artificial teeth and the denture bases were processed to each framework as for a clinical patient. Each removable partial denture was placed in the Instron testing machine and pulled from the test model. The investigation examined the effectiveness of each of four types of clasps in resisting displacing forces, in both vertical (occlusal) and mesio-occlusal directions. Each clasp was tested using natural teeth and gold crowns, in dry and wet environments, both with and without indirect retainers. Results indicate that, (1) The RPA clasp was the most retentive of all on natural abutments, against both directions of pull, but only slightly so over the RPI clasp with a vertical pull. (2) The Akers clasp was most retentive against a mesio-occlusal pull on the gold abutments. (3) Natural tooth structure gives slightly more frictional resistance than a gold surface.(ABSTRACT TRUNCATED AT 250 WORDS)

show abstract

Effect of clasp design upon retention of removable partial dentures

Cited by 33 publications

References 2 publications

Effects of Long‐Term Simulated RPD Clasp Attachment/Detachment on Retention Loss and Wear for Two Clasp Types and Three Abutment Material Surfaces

Effects of Long‐Term Simulated RPD Clasp Attachment/Detachment on Retention Loss and Wear for Two Clasp Types and Three Abutment Material Surfaces

Finite element analysis of stress distribution on modified retentive tips of bar clasp

Clasp Retention: The Effects of Five Variables

Contact Info

Product

Resources

About