An in vitro comparison of retentive force and deformation of acetal resin and cobalt-chromium clasps

Arda, T.; Arıkan, Ayla

doi:10.1016/j.prosdent.2005.06.009

Cited by 82 publications

(102 citation statements)

References 21 publications

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“…Arda and Arikan performed an in vitro study to compare the retentive force and deformation of PR and cobalt-chromium clasps. 8 They found the mean dislodgement force for PR clasps was significantly lower than that for Co-Cr clasps. However, flexibility of PR clasps would allow for the retentive clasp arms of RPDs to be placed in deeper undercuts on abutments.…”

Section: Introductionmentioning

confidence: 96%

Load transfer characteristics of unilateral distal extension removable partial dentures with polyacetal resin supporting components

Jiao

Chang²,

Aa³

2009

Australian Dental Journal

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Background: To photoelastically examine load transfer by unilateral distal extension removable partial dentures with supporting and retentive components made of the lower stiffness polyacetal resins. Methods: A mandibular photoelastic model, with edentulous space distal to the right second premolar and missing the left first molar, was constructed to determine the load transmission characteristics of a unilateral distal extension base removable partial denture. Individual simulants were used for tooth structure, periodontal ligament, and alveolar bone. Three designs were fabricated: a major connector and clasps made from polyacetal resin, a metal framework as the major connector with polyacetal resin clasp and denture base, and a traditional metal framework I-bar removable partial denture. Simulated posterior bilateral and unilateral occlusal loads were applied to the removable partial dentures. Results: Under bilateral and left side unilateral loading, the highest stress was observed adjacent to the left side posterior teeth with the polyacetal removable partial denture. The lowest stress was seen with the traditional metal framework. Unilateral loads on the right edentulous region produced similar distributed stress under the denture base with all three designs but a somewhat higher intensity with the polyacetal framework. Conclusions: The polyacetal resin removable partial denture concentrated the highest stresses to the abutment and the bone. The traditional metal framework I-bar removable partial denture most equitably distributed force. The hybrid design that combined a metal framework and polyacetal clasp and denture base may be a viable alternative when aesthetics are of primary concern.

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Section: Introductionmentioning

confidence: 96%

Load transfer characteristics of unilateral distal extension removable partial dentures with polyacetal resin supporting components

Jiao

Chang²,

Aa³

2009

Australian Dental Journal

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“…(9) Polyoxymethylene (POM), also known as acetal resin,is reported to have a sufficiently high resilience and modulus of elasticity to allow its use in the manufacture of retentive clasps, connectors, and support elements for RPDs. (17) Polyetheretherketone (PEEK) is a semicrystalline linear polycyclic aromatic thermoplastic that was first developed by a group of English scientists in 1978. In the 1980s, PEEK was commercialized for industrial applications, such as aircraft and turbine blades.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Bar Attachment and Clip Materials on Retention Force for Mandibular Implant Supported Overdentures (An Invitro Study)

2018

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Objective: to evaluate the effect of bar and clip attachment systems with different materials on retention forces for two implant supported mandibular over dentures after wear simulation. Materials and methods: An edentulous mandibular model was constructed incorporating 2 parallel implants placed in the canine regions. Attachments were embedded in ametal-reinforced experimental over denture designed to be dislodged from the model by a universaltesting machine. Tensile dislodging force was applied to the overdenture at a cross-head speed of 50 mm/min. Four over dentures were constructed for the attachment systems. The attachments evaluated were metal bar with clip from polyoxymethylene (POM), metal bar with clip from polyetheretherketon (PEEK), (PEEK) bar with (POM) clip and(PEEK) barwith (PEEK) clip. Peak loadto-dislodgement was measured. Retention strength values (N) were recorded initially and after 270, 540, 810 and 1080 cycles of insertion and removal simulating 0, 3, 6, 9 and 12 months of denture using repictively. Repeated measure ANOVA was used to compare between more than two groups for dependent samples while One-way ANOVA was used to compare between more than two groups for independent samples. The significance level was set at P ≤ 0.

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“…The poor esthetic of CoCr clasps lead the search for thermoplastic resin clasps to overcome this problem. Accordingly, Polyoxymethylene (POM), also known as acetal, has been used for the construction of RPD retaining and supporting components [19,20].…”

Section: Introductionmentioning

confidence: 99%

Retentive force comparison between esthetic and metal clasps for removable partial denture

Yamamoto

Sato

Silva

et al. 2017

BDS

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Objective: This study aimed to evaluate the retention of acetate resin clasp as when compared to metal clasp. Material and methods: For this purpose, we constructed 10 conventional Co-Cr metal clasps (Ackers) and 20 acetate resin clasps. The acetate resin clasps had the opposition, support and retaining arms made of Co-Cr. Of the 20 esthetic clasps, 10 had the thickness of the retention arm decreased to make it more esthetic. The initial retentive force of the specimens was tested in a universal testing machine through tensile test. After that, the specimens were subjected to 7,000 cycles, each one, in an adapted machine, immersed into artificial saliva, for 36 months of simulated clinical use of a removable partial denture. Data were tabulated for statistical analysis of the retention effectiveness. Results: After cycling, 3-mm-thick and 2-mm-thick acetate resin clasps lost more retention than metal clasps. The material type (p=0.0000) and cycling (p=0.0039) showed a significant effect, but the material/cycling interaction (p=0.1436) did not. Conclusions: Therefore, esthetic clasps presented retention force lower than that of metal clasps. Notwithstanding, the esthetic clasps can be used in clinical cases requiring minimum retention. KeywordsRemovable partial denture; Esthetic clasp; Metal clasp.

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An in vitro comparison of retentive force and deformation of acetal resin and cobalt-chromium clasps

Cited by 82 publications

References 21 publications

Load transfer characteristics of unilateral distal extension removable partial dentures with polyacetal resin supporting components

Load transfer characteristics of unilateral distal extension removable partial dentures with polyacetal resin supporting components

Effect of Different Bar Attachment and Clip Materials on Retention Force for Mandibular Implant Supported Overdentures (An Invitro Study)

Retentive force comparison between esthetic and metal clasps for removable partial denture

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