Effect of Clasp Design on Retention at Different Intervals Using Different Abutment Materials and in a Simulated Oral Condition

Helal, Mohamed Ahmed; Baraka, Osama A.; Sanad, Mohamed; Al-Khiary, Yasser; Ludwig, Klaus; Kern, Matthias

doi:10.1111/jopr.12072

Cited by 14 publications

(27 citation statements)

References 23 publications

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“…Loss of retention of the clasps due to fatigue resistance test was considered as a good indicator of permanent deformation of the clasps (3) . These agreed with Helal, et al who reported that the clasp may lose its retention force as a result of multiple deflections (12) , and contradict with Meenakshi, et al who showed that the retention force of acetal clasps did not decrease after cycling intervals while the Co-Cr clasps lost retention force within 730 cycles of insertion/removal and continued to lose retention force during the remaining intervals (23) .This may be explained by the method which is used to carry out the test.…”

Section: Discussionsupporting

confidence: 91%

“…The test conditions were maintained at room temperature (25 ± 2˚C) and wet condition. Removal and insertion cycling of clasps was carried out for 360, 730, 1080, 1440, 2116 and 2880 cycles (corresponding to 3,6,9, 12, 18 and 24 months of simulated clinical use of a RPD) to simulate the fatigue resistance test (12) . Using Universal testing machine running at 5 mm/ min the retention force was determined for the clasp at 360, 730, 1080, 1440, 2116 and 2880 cycles, and recorded by the computer software (Bluehill, Instron instruments).…”

Section: Testing Conditionsmentioning

confidence: 99%

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Retention and Fatigue Resistance of Peek and Acetal Thermoplastic Resin Clasps

Segai

Abbas

2018

Egyptian Dental Journal

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Aim;The objective of this study was to evaluate the retentive force of clasps made from two thermoplastic resins by the insertion/removal test simulating two years. Methods:Over standardized premolar and molar metal crowns 36 clasps were fabricated, including 18 clasps (1.5 mm thick) from each of the following thermoplastic resins: polyetheretherketon (PEEK) and polyoxymethylene (POM). Each clasp assembly was subjected to an insertion/removal test on its abutment crown. Retention of each clasp at pre-test (Baseline) and after insertion/removal cycling intervals (360, 730, 1080, 1440, 2116 and 2880 cycles by chewing simulator) were measured by applying withdrawal force to it using universal testing machine. To analyze the retention over the course of insertion/removal test, retention was measured every 360 cycles. Data were statistically analyzed using 3-way ANOVA (α= 0.05).Results. PEEK Resin material group recorded statistically significant higher mean value than Acetal material group mean value (P=0.0013<0.05). Molar abutment group recorded statistically non-significant higher mean value than premolar abutment group mean value (P= 0.0620>0.05). Retention decreased significantly as indicated by three-way ANOVA (P= 0.007<0.05). Conclusion:Retention forces of PEEK clasps were clinically acceptable, and superior to retention forces of Acetal clasps. However, both the retention of adequately designed resin clasps might be enough for clinical use. Clasps made of PEEK showed the more promising retentive force with a non-fracture tendency at tooth undercut.

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Section: Discussionsupporting

confidence: 91%

Section: Testing Conditionsmentioning

confidence: 99%

Retention and Fatigue Resistance of Peek and Acetal Thermoplastic Resin Clasps

Segai

Abbas

2018

Egyptian Dental Journal

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“…(19)(20)(21)(22) Therefore, the present study was conducted to assess the influence of different staining beverages on the color stability of two newly introduced thermoplastic Acetal resin tooth-colored clasp materials by scanning spectrophotometer at different immersion periods. (23,24) Retentive clasp arms must be capable of flexing and returning to their original form .also , must be minimize the stresses on the abutment as much as possible and prevent permanently distorted during service in addition to provide good aesthetic results (25)(26)(27) In this in vitro study the two different materials were used Group A: polyoxymethylene (Acetal) and Group B: polyamide (Bre-flex 2nd edition) for construction RPD esthetic clasp and denture base.…”

Section: Discussionmentioning

confidence: 99%

EVALUATION THE FATIGUE RESISTANCE AND COLOR STABILITY OF ACETAL RESIN AND BRE- FLEX (2nd EDITION) IN KENNEDY CLASS I REMOVABLE PARTIAL DENTURE. AN IN-VITRO STUDY

Helmy

2018

Egyptian Dental Journal

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Purpose: This study was aimed to compare and evaluate the fatigue resistance and the color stability of polyoxymethylene (Acetal) and Bre-Flex (2nd edition). Materials and Method:Twenty partially edentulous models Kennedy class I were constructed with first premolars are last abutments. Models were divided into two equal groups Group A: Construction of RPD with Polyoxymethylene (Acetal) clasps and denture base, Group B: Construction of RPD with Polyamide (Bre-flex 2nd edition) clasps and denture base. The Retention and fatigue resistance of each clasp after cycling intervals (360 cycles, 720 cycles, 1440 cycles, and 2880 cycles) were measured by applying withdrawal force to it using a universal testing machine. The data of the retentive force magnitudes at different intervals were collected and tabulated. Also, the color change was evaluated after 4 weeks by measured a total 20 specimens for each group (size of the disc was set to 4 mm) in different immersion media cola (acidic pH), Licorice (alkaline pH), (neutral pH) Distilled Water using a portable Reflective spectrophotometer. The data were subjected to statistical analysis using 3-way-ANOVA test, Student's t and paired t-tests. Results:Regarding the retention and fatigue resistance it was found that group B recorded statistically significant higher mean value than group A. Regarding the color change the total effect of the main group on color change (∆E); it was found that group A recorded statistically significant higher change mean value than group B as revealed by two-way ANOVA test (p=<0.0001<0.05). Conclusion:The removable partial dentures were constructed the denture bases and the clasps with the poly amid Bre-flex 2nd edition was exhibited superior color stability and fatigue resistance when compared with the removable partial dentures constructed their claps and denture bases from polyoxymethylene (Acetal).

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“…Cast clasps were planned, since rigid direct retainers are associated with less mobility of the abutment teeth and less force on the residual ridge than wrought‐wire retainers . Back‐action clasps with mesial rests were used on premolar teeth bilaterally to provide more retention and stability from their long arms . It has also been found that back‐action clasps can maintain their retentive force for a longer period .…”

Section: Clinical Reportmentioning

confidence: 99%

“…Back‐action clasps with mesial rests were used on premolar teeth bilaterally to provide more retention and stability from their long arms . It has also been found that back‐action clasps can maintain their retentive force for a longer period . Mesial rests were used to reduce stress on the abutment teeth in the distal‐extension RPD.…”

Section: Clinical Reportmentioning

confidence: 99%

A Collapsible Partial Denture for a Patient with Limited Mouth Opening Induced by Scleroderma: A Clinical Report

Türk

Ulusoy

2014

Journal of Prosthodontics

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A limited opening of the mouth is defined as microstomia. Microstomia is caused by burns, postoperative head and neck trauma, radiotherapy, or scleroderma. The prosthetic treatment of microstomia presents particular challenges, and patients often complain of an inability to insert or remove the prosthesis. The cause and severity of microstomia can influence the approach to treatment. Different treatment methods have been suggested, including the fabrication of two-piece partial dentures. This clinical report describes the construction of a sectional impression tray and a collapsed partial denture using a hinge attachment for a patient with microstomia.

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Effect of Clasp Design on Retention at Different Intervals Using Different Abutment Materials and in a Simulated Oral Condition

Abstract: (1) The back-action clasp maintains its retention force for a longer period than the circlet (E) clasp. (2) Composite resin contouring of teeth provided retention comparable to enamel and a ceramic material.

Cited by 14 publications

References 23 publications

Retention and Fatigue Resistance of Peek and Acetal Thermoplastic Resin Clasps

Retention and Fatigue Resistance of Peek and Acetal Thermoplastic Resin Clasps

EVALUATION THE FATIGUE RESISTANCE AND COLOR STABILITY OF ACETAL RESIN AND BRE- FLEX (2nd EDITION) IN KENNEDY CLASS I REMOVABLE PARTIAL DENTURE. AN IN-VITRO STUDY

A Collapsible Partial Denture for a Patient with Limited Mouth Opening Induced by Scleroderma: A Clinical Report

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