Abstract
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.
Highlights
Oral rehabilitation is very important for the individual’s masticatory, phonetic and aesthetic functions, because those significantly affects the quality of life [1,2]
Recent studies on prosthetic restorations illustrate the value of removable partial dentures (RPD) design for a satisfactory use with good retention, stress distribution and aesthetic performance [6,7,8]
The results of this present study demonstrated that after cycling, 3-mm-thick and 2-mm-thick acetate resin clasps lost more retention than metal clasps
Summary
Oral rehabilitation is very important for the individual’s masticatory, phonetic and aesthetic functions, because those significantly affects the quality of life [1,2]. Despite of the advocated performance and success rates of fixed partial dentures (FPD), removable partial dentures (RPD) are still used for oral rehabilitation. The extension of the edentulous space, bone loss, short clinical crowns or financial conditions may account for other forms of rehabilitation such as RPD [3,4,5], used for years for the stomatognathic system restoration. Recent studies on prosthetic restorations illustrate the value of RPD design for a satisfactory use with good retention, stress distribution and aesthetic performance [6,7,8]. The major factor for RPD success is the retention [9,10]. The mechanical properties of RPD retainers knowing, clasps, depend on the materials composition as: titanium, gold, nickel/chromium and cobalt-chromium (CoCr) alloys [11,12]. Co-Cr alloys presents advantages in comparison to noble metal alloys as they have mechanical properties like flexibility [11], corrosion resistance, lighter weight, and higher cost effectiveness [13,14]
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