Influence of Depth Alignment of E-Glass Fiber Reinforcements on Dental Base Polymer Flexural Strength

Denis Vojvodić; Dražan Kozak; Josip Sertić; Ketij Mehulić; Asja Celebic; Dragutin Komar

doi:10.3139/120.110528

Published by De Gruyter May 26, 2013

Influence of Depth Alignment of E-Glass Fiber Reinforcements on Dental Base Polymer Flexural Strength

Einfluß der Tiefenausrichtung von E-Glas-Faserverstärkungen auf die Biegefestigkeit von Dental-Basispolymeren

Denis Vojvodić , Dražan Kozak , Josip Sertić , Ketij Mehulić , Asja Celebic and Dragutin Komar

From the journal Materials Testing

https://doi.org/10.3139/120.110528

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Abstract

Fractures of denture base polymer material are one of the most frequent reasons for repair of removable dentures. The aim of this study was to determine the influence of depth alignment of glass fiber reinforcements onto denture base polymer flexural obtained with the “short beam” testing method. The study showed higher values of flexural strength when reinforcements were placed 1mm from specimen surface (130,63 to 158,55MPa) compared to 0,5mm distance from specimen surface (117,83 to 153,68MPa). Specimens tested after polymerization had higher flexural strength values than specimens tested after storage in water, while thermocycled specimens unexpectedly revealed the highest values. It could be concluded that fiber reinforcements should be positioned more than 0,5mm (up to 1mm) from the base surface of dental prostheses since lesser distance would diminish the reinforcing effect.

Kurzfassung

Brüche von Dental-Basispolymerwerkstoffen sind eine der häufigsten Ursachen für die Reparatur von herausnehmbaren Zahnprothesen. Die diesem Beitrag zugrunde liegende Studie hatte zum Ziel, den Einfluß der Tiefenausrichtung von Glasfaserverstärkungen auf das Biegeverhalten von Basispolymeren mittels des Kurzbalken-Testverfahrens zu untersuchen. In der Studie ergaben sich höhere Werte der Biegefestigkeit (130,63 bis 158,55 MPa gegenüber 117,83 bis 153,68 MPa), wenn die Verstärkungen einen statt einem halben Millimeter statt unterhalb der Probenoberfläche eingebracht wurden. Proben, die nach der Polymerisation geprüft wurden, wiesen eine höhere Biegefestigkeit als nach dem Lagern in Wasser auf, während thermozyklierte Proben unerwarteterweise die höchsten Biegefestigkeiten aufwiesen. Es kann angenommen werden, dass Faserverstärkungen mehr als einen halben und bis zu einem Millimeter tief unter der Basisoberfläche von Dentalprothesen eingebracht werden sollten, da geringere Abstände zur Oberfläche den Verstärkungseffekt reduzieren.

Denis Vojvodić was born in Zagreb (Croatia) in 1963. He graduated from the School of Dental Medicine in Zagreb in 1989. He obtained his Master's in 1992, and the PhD in 1996. Since 2006, he is full time professor at the Dept. of Prosthodontics, School of Dental Medicine, Zagreb. He is principal investigator on the project “Investigation of materials and clinical procedures in prosthetic dentistry” supported by the Ministry of Science. His research interest is in the field of dental materials.

Dražan Kozak, born 1967 in Derventa, is full professor and currently Dean of the Mechanical Engineering Faculty at the Slavonski Brod, J. J. Strossmayer University of Osijek, Croatia. He graduated at the same Faculty in 1991, achieved his Master of Science in 1995 and his PhD degree in 2001, both at the University of Zagreb. He is principal investigator on the bilateral projects with Austria, Hungary, Slovenia, and Serbia and also leader of the project ‘Analysis and fracture assessment of structures of anisotropic materials' granted by Croatian Ministry of Science, Education and Sports. He is coordinator of three Ceepus projects. He published over 100 scientific- research papers, and he is member of the Editorial Board of 5 journals.

Josip Sertić, born 1981 in Po?ega, is assistent at the Department of Mechanical Construction, of the Mechanical Engineering Faculty at Slavonski Brod, J. J. Strossmayer University in Osijek. He graduated from the same Faculty in 2005 where he now attends PhD study. He is research assistant on the national project ?“Analysis and fracture assessment of structures made of anisotropic materials” He is member of Croatian Society of Mechanics. As an author and co-author he has published several scientific and expert papers.

Ketij Mehulić, was born in Split, Croatia in 1963. She graduated from the School of Dental Medicine, University of Zagreb in 1988. She defended her Master's in 1992 and her PhD in 1996. Since 2004, she is Associated Professor at the Dept. of Prosthodontics, School of Dental Medicine, Zagreb. She is principal investigator on her own project, as well as on the bilateral project (Croatia-Slovenia) both funded by the Ministries of Sciences. Her research interests involve dental materials, especially dental ceramics.

Asja Celebic, born 1956 in Zagreb, is employed as a full professor at the School of Dental Medicine, University of Zagreb, Croatia at the Dept. of Prosthodontics. She gradated in 1980 at the same Dental School as the best student where she also earned her PhD. title in 1993. She has published more than 200 papers (60 in journals with impact factors). She is a principal investigator of a scientific project recognized from the Ministry of Science, Croatia. She is a member of the editorial board of 4 journals (one listed in CC and another in SCI). She also earned several domestic and international awards for her scientific presentations.

Dragutin Komar was born in Zagreb in 1956. He graduated from the School of Dental Medicine in Zagreb in 1979, earned his Master's degree in 1985, and the PhD in 1992. He is full time professor at the Dept.of Prosthodontics, School of Dental Medicine, acting also as a Head of Dept. from 2003–2007. He is actual Dean of School of Dental Medicine, University of Zagreb from 2007.

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Published Online: 2013-05-26

Published in Print: 2011-09-01

Influence of Depth Alignment of E-Glass Fiber Reinforcements on Dental Base Polymer Flexural Strength

Abstract

Kurzfassung

References

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