Effect of clasp type and pullout location on clasp retention in different environment: In vitro study

Mourshed, Bilal; Al-Sabri, Fuad Abdo; Qaed, Nashwan-Ahmed; Alaizari, Nader Ahmed; Al-Shamiri, Hashem Motahir; Alfaqih, Amal

doi:10.4103/ejd.ejd_70_17

Cited by 5 publications

(5 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This pattern of dislodging forces mimics the direction of the forces acting on RPD in the patient mouth. (50) The differences observed in the retention forces prior to thermo-cycling are probably due to the different modulus of elasticity of the materials. (Elastic modulus; 2.4 GPa for Acetal and 4.0 GPa for Peek) Thus, the greater modulus of elasticity of the material means less flexibility and greater retention force toward the Peek clasp group.…”

Section: Discussionmentioning

confidence: 99%

Effect of thermo-cycling on retentive forces of different esthetic thermoplastic clasp materials for removable partial denture. (In-vitro comparative study)

mohammed

Sayed

2022

Egyptian Dental Journal

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Effect of thermo-cycling on retentive forces of different esthetic thermoplastic clasp materials for removable partial denture. (In-vitro comparative study)

mohammed

Sayed

2022

Egyptian Dental Journal

View full text Add to dashboard Cite

“…[1] Newer dental technologies, allow the fabrication of RPD with satisfactory mechanical, esthetical, functional, and biological outcomes with no or minimal periodontal tissue problems. [2,3] In free end saddle RPDs clasps are the basic mean of retention and it must be designed in a manner to provide maximal retention without harmful tipping or rotational forces on the abutment teeth. [3,4] Clasp assembly should meet six basic requirements in order to perform its function safely: retention, stability, support, reciprocation, encirclement, and passivity.…”

Section: Introductionmentioning

confidence: 99%

Retention and deformity of different RPD clasp materials (an invitro experimental study)

quassem

Elhatery

abohelal³

2023

Egyptian Dental Journal

View full text Add to dashboard Cite

An in-vitro experimental study was conducted to compare retention and deformity of three different RPD clasp materials (poly ether ether ketone, nickle titanium alloy, and acetal materials) with conventional cobalt chromium alloy; material and methods; A total of (56) RPD's Aker clasps were divided into four equal main groups (n=14) according to type of clasp materials; poly ether ether ketone (PEEK), nickle titanium (Ni/Ti), acetal, and cobalt chromium (Co/Cr) materials. All clasp samples in each group were used for retention test and deformity test.Results: One way ANOVA test and Pairwise comparison between each 2 groups using Post Hoc Test were used for retention and deformity tests at base line and after 730 , 1460 ,2190 and 2920 cycles revealed that metallic (Co/Cr) clasps ofer greater retentive forces followed by(Ni/ Ti) than non metallic (PEEK) then acetal resin clasps with differences considered as Statistically significant as p ≤ 0.05 at all testing loading cycles. also (Co/Cr) clasps offer greater deformity value followed by(Ni/Ti) than non metallic (PEEK) and acetal resin clasps with differences considered as Statistically significant as p ≤ 0.05 nearly at all testing loading cycles except at 2920 cycles where non-metallic (PEEK) followed by acetal resin clasps offer greater deformity than metallic(Co/Cr) clasps then(Ni/Ti) with differences considered as Statistically significant as p ≤ 0.05.Conclusion within limitations of this study it is better to use PEEK clasps for esthetic reasons; and (Co/Cr) clasps for retention reasons.

show abstract

“…As a general rule, the amount of retention required to dislodge the RPD from the supporting structure should always be the minimum necessary to resist reasonable dislodging forces. Excessive force from the clasps may cause many problems [4]. Circumferential clasps are the most frequently used direct retainers, and long term success of RPD depends on properties of clasps [5].…”

Section: Introductionmentioning

confidence: 99%

Examination of inter-rater and intra-rater reliability during retentive force measurement of different clasps using the developed small-sized retentive force measurement device

et al. 2020

View full text Add to dashboard Cite

Background: The design process of a removable partial denture (RPD) consists of rests, major connectors, minor connectors, denture base, and retainer. The abutment tooth contour determines the location of the retention portion of the clasp at the retention areas. The load capacity of the clasp depends on various factors such as type, the position of a clasp, tooth position, clasp length, and pullout location. As a general rule, the amount of retention required to dislodge the RPD from the supporting structure should always be the minimum necessary to resist reasonable dislodging forces. Excessive force from the clasps may cause many problems. Although there are many reports on the retentive force of cast clasps using large devices, it has not been possible to measure it using simple devices until now. Method: The purpose of the present study is to develop a small-sized retentive force measurement device that can easily measure the retentive force of a clasp used for an RPD. It is to examine inter-rater and intra-rater reliability. A small-sized retentive force measurement device that can be easily measured in the laboratory has been developed. Using commercially available hard plaster cast, a skilled dental technician has made 10 types of cast clasps used in clinical practice using conventional techniques. Three assessors measured the retentive force of 10 types of cast clasps. To confirm the reliability, the intra-class correlation coefficients ICC (1,1) and ICC (1,3) of the 3 assessors were calculated, and the reliability within the assessor was examined. The inter-class correlation coefficients ICC (3,1) and ICC (3,3) were calculated, and the reliability of the assessors was examined. Result: The intra-class correlation coefficients of 3 assessors are as follows: assessor 1 has ICC (1,1) = 0.971, ICC (1,3) = 0.990, assessor 2 has ICC (1,1) = 0.967, ICC (1,3) = 0.989, assessor 3 has ICC (1,1) = 0.962, ICC (1,3) = 0.987. The inter-class correlation coefficients of 3 assessors are as follows: ICC (3,1) = 0.993, ICC (3,3) = 0.998. From the evaluation standard of the intraclass correlation coefficients of reliability value by ICC, it was evaluated as almost perfect and high reproducibility was confirmed.

show abstract

Effect of clasp type and pullout location on clasp retention in different environment: In vitro study

Cited by 5 publications

References 20 publications

Effect of thermo-cycling on retentive forces of different esthetic thermoplastic clasp materials for removable partial denture. (In-vitro comparative study)

Effect of thermo-cycling on retentive forces of different esthetic thermoplastic clasp materials for removable partial denture. (In-vitro comparative study)

Retention and deformity of different RPD clasp materials (an invitro experimental study)

Examination of inter-rater and intra-rater reliability during retentive force measurement of different clasps using the developed small-sized retentive force measurement device

Contact Info

Product

Resources

About