New Clasp Assembly for Distal Extension Removable Partial Dentures: The Reverse RPA Clasp

Hakkoum, Mohammad Ayham

doi:10.1111/jopr.12313

Cited by 4 publications

(5 citation statements)

References 13 publications

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“…Hakkoum proposed the reverse RPA design, in which distobuccal undercuts are engaged. 5 In this design, the retentive arm emerges buccally from the mesial occlusal rest to engage the undercut in the distobuccal area. The terminal part of this arm is in contact with the distal aspect of the buccal surface of the tooth.…”

Section: Other Designsmentioning

confidence: 99%

“…A number of other designs have also been proposed. [4][5][6] This article is a case report aimed at discussing the fabrication of a removable partial denture that provides distal extension with good retention, support, stability, aesthetics and masticatory function. In particular, denture designs and the altered cast technique needed to address problems related to free-end saddles are discussed.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

<p>Distal Extension Denture – Case Report and Overview</p>

Yeung

Leung

et al. 2020

CCIDE

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Replacing missing teeth distal to the last standing teeth with removable partial dentures poses considerable challenge to dentists. However, the insertion of implants turns a free-end saddle into a bounded saddle. Still, patients may not be able to accept implant insertions due to financial reasons, systemic medical conditions, local anatomical factors or complicated treatments involving surgery. Hence, patients with missing teeth often prefer to use removable partial dentures to improve their dental aesthetics and to restore their oral function. In this article, we use a clinical case to illustrate the clinical procedures required for the fabrication of a distal extension denture with good retention, support, stability, aesthetics and masticatory function. We also review the design for a clasp assembly on the abutment adjacent to the distal edentulous ridge.

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Section: Other Designsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

<p>Distal Extension Denture – Case Report and Overview</p>

Yeung

Leung

et al. 2020

CCIDE

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show abstract

Section: Introductionmentioning

confidence: 99%

“…In partial edentulous patients with bilateral (Class I Kennedy) or unilateral (Class II Kennedy) distal extension, retention, stability and support are very important [19]. The selected clasp must provide good retention, transfer forces parallel to the tooth axis, and minimize the application of damaging forces to the abutment tooth [12,19]. In these situations, it is common to use clasps with mesial occlusal rests, such as the reverse backaction clasp when buccal retention is on the distal side and the back-action clasp when there is mesial retention [16,19,20].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Retentive Forces from Removable Partial Denture Clasps Manufactured by the Digital Method

et al. 2023

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The purpose of this study was to evaluate the retentive forces over time of removable partial denture clasps fabricated by the digital method. Occlusal rest seats were fabricated on three premolar teeth fixed in acrylic blocks (9 × 20 × 40 mm). Digitization of the teeth was performed using a laboratory scanner (Zirkonzahn Scanner S600 GmbH, Gais, Italy). After the analysis and determination of the insertion axis, two types of clasps with mesial occlusal rests were designed per tooth: the back-action and the reverse back-action clasps, using the Partial Planner Zirkonzahn program. The file was sent for fabrication of six metal clasps from a cobalt-chromium SP2 alloy in the EOSINT M270 system by a direct laser sintering process. The Instron 5544 universal testing machine was used to perform 20,000 cycles of clasp insertion and removal in the corresponding tooth with a load cell of 100 N and a speed of 2.5 mm/s. The retentive force was recorded for each of the 1000 cycles, and the change in retention over time was calculated. Statistical analysis was performed using the nonparametric Mann–Whitney test and a significance level of 5%. At 16,000 cycles, a maximum change in retention of 3.74 N was recorded for the back-action clasps and a minimum of −24.28 N at 1000 cycles for the reverse back-action clasps. The reverse back-action clasps exhibited statistically significant lower change in retention than the reverse-action clasps at 4000 and 5000 cycles. No differences were observed in the remaining cycles. During the 20,000 cycles, the change in retention was low regardless of the type of clasp. For most cycles, there were no differences in the change in retention between the two types of clasps.

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“…Many types of retentive systems are used in removable partial dentures [ 1 - 3 ]. Also, several types of attachments are used with overdentures [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%