scholarly journals Retentive force and fitness accuracy of cobalt-chrome alloy clasps for removable partial denture fabricated with SLM technique

Author(s):  
Manman Zhang ◽  
Ning Gan ◽  
Haixin Qian ◽  
Ting Jiao
1991 ◽  
Vol 35 (6) ◽  
pp. 1125-1132
Author(s):  
Koji Suga ◽  
Tatsuo Namikoshi ◽  
Zenya Koyama ◽  
Takaaki Uchino ◽  
Tetsuro Torisu ◽  
...  

2019 ◽  
Vol 22 (4) ◽  
pp. 483-487
Author(s):  
Juan Cruz Mutto ◽  
Tabata Prado Sato ◽  
João Mauricio Ferraz Da Silva ◽  
Alexandre Luiz Souto Borges ◽  
Eduardo Shigueyuki Uemura

Objective: This study aimed to evaluate and compare the retention force of individual clasps made from polyamide, acetate resin and cobalt-chrome for removable partial dentures. Material and methods: Three groups of clasps were fabricated: Cr-Co - 10 conventional chrome-cobalt metal clasps; Ac - 10 clasps with reciprocal arms and occlusal rests in chrome-cobalt and retentive arms in acetate resin; and Poly - 10 clasps with reciprocal arms and occlusal rests in chrome-cobalt and retentive arms in polyamide resin. Through the tensile test, in a universal testing machine, the initial retention force of the specimens was obtained and then clasps were cycled 7200 times, immersed in artificial saliva (60 months of simulated clinical use). After cycling, tensile test was performed. Results: All groups presented a retention decrease after the cycling. Ac presented a large reduction in retentive force (61.43%), followed by Cr-Co (26.5%) and Poly (12.09%). Conclusions: Aesthetic clasps of polyamide can be used in clinical cases where the anterior supporting teeth will not be essential for good retention of the removable partial denture because this clasp showed to be more resistant than the acetate resin.


Author(s):  
Nobuhiro Yoda ◽  
Masayoshi Yokoyama ◽  
Takahiro Chiba ◽  
Genki Adachi ◽  
Masatoshi Takahashi ◽  
...  

2017 ◽  
Vol 20 (3) ◽  
Author(s):  
Tabata Prado Sato ◽  
Eron Toshio Colauto Yamamoto ◽  
João Mauricio Ferraz Da Silva ◽  
Alexandre Luiz Souto Borges ◽  
Eduardo Shigueyuki Uemura

<p><strong>Objective:</strong> This study aimed to evaluate the retention of acetate resin clasp as when compared to metal clasp. <strong>Material and methods:</strong> 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. <strong>Results:</strong> 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. <strong>Conclusions:</strong> 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.</p><p> </p><p><strong>Keywords</strong></p><p>Removable partial denture; Esthetic clasp; Metal clasp.</p>


2020 ◽  
Vol 29 (02) ◽  
pp. 66-70
Author(s):  
Muhammad Farhan Khan ◽  
◽  
Fatima Naseem Ahmed Khan ◽  
Muneeb Ahmed Lone ◽  
Muhammad Waqar Hussain ◽  
...  

Author(s):  
Tasuku Yoshimoto ◽  
Yoko Hasegawa ◽  
Simonne Salazar ◽  
Satsuki Kikuchi ◽  
Kazuhiro Hori ◽  
...  

(1) Background: The degree of satisfaction with dental treatment varies among patients, and the discrepancy may exist between the patient’s subjective evaluation and the objective assessment. Further, the optimal methods for increasing patient satisfaction with mastication remain unclear. This study aimed to identify factors affecting masticatory satisfaction in patients with removable partial dentures. (2) Methods: A total of 132 participants (71.0 ± 9.0 years) were included. Masticatory satisfaction was assessed on a visual analog scale. An oral health survey was conducted to assess the number of functional teeth, missing tooth classification: Kennedy classification, occlusal support: Eichner classification, and removable partial dentures wearing jaw. Objective masticatory performance was assessed using gummy jelly, while subjective masticatory ability was assessed using food acceptance status and oral health-related quality of life. The associations of these factors with masticatory satisfaction were assessed. (3) Results: Masticatory satisfaction among removable partial denture wearers was not significantly associated with gender, age, denture wearing jaw, Kennedy classification, and occlusal support. The degree of masticatory satisfaction was significantly greater with higher levels of masticatory function: masticatory performance, food acceptance score, and OHIP-14 score. The OHIP-14 score was the only significant explanatory variable for masticatory satisfaction in the multiple regression analysis; the strongest associations were with the “psychological discomfort” and “physical disability” subscales (p = 0.02 and p = 0.005, respectively). (4) Conclusions: Masticatory satisfaction among removable partial denture wearers was strongly associated with oral health-related quality of life, in which the ability to eat meals comfortably with removable partial dentures is the most important determinant of masticatory satisfaction.


2021 ◽  
Author(s):  
Frank I. Gentz ◽  
Daniel I. Brooks ◽  
Peter C. Liacouras ◽  
Anton Petrich ◽  
Christopher M. Hamlin ◽  
...  

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