Page 21 - Prestige Pulpdent

PROPERTIES
TOUGHNESS, FATIGUE LIMIT, DEFLECTION AT BREAK
ACTIVA’s rubberized resin component provides unparalleled toughness and resilience. Toughness, measured by deflection at break using a 3-point bend test, is the ability of a strong, hard material
Fig 1: Illustration shows 3-point bend test
to absorb stress, dissipate forces and resist Deflection at Break of ACTIVA is 2-3 times fracture when a load is applied. Fatigue greater than composites and 5-10 times limit is determined by the incremental load greater than GIs and RMGIs.
required to cause fracture within a defined
number of cycles.
Deflection at Break = Toughness/Flex/
Ability to Absorb Stress & Resist Fracture 2,5
1,2 1,0 0,8 0,6 0,4 0,2
Fig 2:Filtek = Composite; ACTIVA = Bioactive Restorative; Ketac Nano = RMGI; Fuji IX = GI
Source: University testing5,17 (References: www.pulpdent.com/ education-articles)
Deflection at Break of Four Dental Cements
2 1,5 1 0,5 00
Fig 3:ACTIVA = Bioactive Cement; RelyX Unicem Automix = Self-adhesive Cement; FujiCEM 2 = RMGI; Ceramir = Calcium Aluminate-GI
Source: University testing34 (References: www.pulpdent.com/ education-articles
FLEXURAL STRENGTH AND FLEXURAL FATIGUE
Flexural strength and flexural fatigue measure the amount of stress a material can withstand, measured by deflection at break, and its endurance, measured by the number of
repeated cycles before failure. ACTIVA meets the requirement of ISO 4049 for occlusal restorations and demonstrates flexural strength and flexural fatigue comparable to
flowable composites (FC) and significantly greater than conventional RMGIs and GIs tested.
120 100 80 60 40 20 0
Flexural Strength (MPa) Flexural Fatigue (MPa)
Flexural Strength & Fatigue of ACTIVA compared to Glass Ionomers / RMGIs / Flowable Composite
(FC) (FC)
(RMGI)
(RMGI) (RMGI) (GI)
(GI) (RMGI)
(RMGI)
(RMGI) (RMGI)
Source: University testing29 (References: www.pulpdent.com/education-articles)
PULPDENT Corporation / 800-343-4342 / 617-926-6666 / www.pulpdent.com
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Deflection at Break (mm)
Deflection at Break (mm)