Bedini R, Bossi A, Chistolini P, De Angelis G, Formisano G, Caiazza S; International Society of Technology Assessment in Health Care. Meeting.
Abstr Int Soc Technol Assess Health Care Meet. 1993; 9: 171.
Lab. of Biomedical Engineering, Istituto Superiore di Sanita, Rome, Italy.
The most widely used dental restorative materials are silver amalgam and tooth-colored composite materials. Their effectiveness in restoring the tooth function is established by mechanical testing and scanning electron microscopy (SEM). This study is aimed at assessing the mechanical performance of four composites, of the bonding agent used for the different composites and for amalgam/composite combinations. The four composites were Silux Plus, Heliomolar, Prisma APH and Herculite XRV, and the amalgam was New Amalcap Plus. Specialbond II was used for composite/composite dumbbell specimens, and added to Monobond S for amalgam/composite specimens. By means of a mechanical testing machine, specimens were subjected to tensile strength at break, cylindric specimens to compression and sandwich specimens to shear-stress (ASTM C273, BS 4370). The tested specimens were mounted on aluminium stubs, gold coated in a sputtering device and their fractured surfaces observed by means of a Cambridge Stereoscan 360 SEM. Tensile test speed was 5 mm/min, compression test speed was 0.5 mm/min, shear-stress speed was 20 mm/min. The load cells used for the tests were 30 KN, 5 KN, and 100 N, respectively. Tensile strength at break mean values over ten dumbbell specimens for each composite agree with the mean values obtained over ten aged-composite/fresh-composite dumbbell specimens. Herculite showed the best performance in tensile and in compression tests. As regards composite combinations, the best tensile strength performance was shown by Prisma/Herculite whose fractured surfaces observed by SEM presented a fracture pattern characterised by a typical form of material detachment. Heliomolar/New Amalcap specimens showed the best mean values for tensile strength and shear stress. Interface strength will be further studied in relation to improved bonding agents. This study may be regarded as a contribution towards i) the assessment of these materials in view of the imminent legislation on the matter, and ii) a more complete information on material performance which is seldom furnished by manufacturers.
Publication Types:
Keywords:
- Acrylic Resins
- Bisphenol A-Glycidyl Methacrylate
- Composite Dental Resin
- Composite Resins
- Dental Amalgam
- Dental Cements
- Dental Materials
- Herculite XR
- Humans
- Monobond S
- Polyurethanes
- Prisma APH
- Resin Cements
- Tensile Strength
- amalcap
- hsrmtgs
Other ID:
UI: 102211552
From Meeting Abstracts