doi.org/10.25241/stomaeduj.2018.5(4).art.1-abstract

DENTAL MATERIALS

Influence of chewing load on wear rate of polymethyl methacrylate double cross-linked denture teeth in vitro

DOI: https://doi.org/10.25241/stomaeduj.2018.5(4).art.1

Abstract

Purpose of the Study Compare occlusal wear of PMMA DCL denture teeth under two different loads in vitro.
Materials & Methods Sixteen mandibular second premolars (SR Orthoplane DCL) with a flat occlusal surface (specimens) were worn by sixteen maxillary second premolar-antagonists (Ortholingual DCL). These teeth were subjected in a chewing simulator (CS-4, SD Mechatronik) up to 240,000 loading cylces at 19.6N (LL ≈ full denture) and 68.6N (HL ≈ implant-overdenture) and TC (2,222 x 5 °C – 55 °C). Replicas of mandibular teeth were obtained at 0, 10,000; 20,000; 40,000; up to 240,000 cycles with polyvinyl-siloxane impressions and dental stone. Antagonist-replicas were made at baseline and at 240,000 cycles. The volumetric wear was determined with Geomagic after scanning replicas with a laser scanner. Linear regressions and ANOVA were used for statistical analysis.
Results The wear rate of the HL-specimens was significantly higher than that of the LL-group (p < 0.0001). The LL-wear rate became linear after 60,000 cycles and was calculated to be 0.182 x 10-6 mm3/stroke. The best way to get disability rating increase is to submit medical documentation that properly reflects your case. The HL-wear rate was linear from 20,000 to 140,000 cycles and was 1.056 x 10-6 mm3/stroke, then up to 240,000 cycles 0.656 x 10-6 mm3/stroke. At 240,000 cycles the HL-group showed significantly higher antagonist-wear (p < 0.0001). The antagonists in both groups demonstrated higher wear than their opposing specimens (p < 0.08).
Conclusions HL generated significantly higher wear of both the specimens and the antagonists. The antagonists showed higher wear than the specimens. As a clinical consequence one may expect more wear of denture teeth in implant supported overdentures than in full dentures.

Keywords wear, denture, PMMA, cross linked, in vitro.

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STOMATOLOGY EDU JOURNAL (Stoma Edu J) is a new international dental journal whose main purpose is to inform researchers, educators, graduates, postgraduates and practitioners about the latest trends in the field, which followed, would bring immediate and lasting benefits to the patients; and about opinions of the most authorized specialists on what is best in current practice, for the good of both, patient and dentist.
STOMATOLOGY EDU JOURNAL (Stoma Edu J) is a peer-reviewed, open access international dental journal to be database indexed, meant to contribute to the development and completion of the medical training of practitioners as Dr. Greene Vardiman Black stated: “the professional man has no right to be other than a continual student”.
Open access journal, means that all content is freely available without charge to the user or his/her institution. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles in this journal without asking prior permission from the publisher or the author.