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Pregled bibliografske jedinice broj: 907480

Real-time light transmittance monitoring for determining polymerization completeness of conventional and bulk-fill dental composites


Par, Matej; Repusic, Igor; Skenderovic, Hrvoje; Klaric Sever, Eva; Marovic, Danijela; Tarle, Zrinka
Real-time light transmittance monitoring for determining polymerization completeness of conventional and bulk-fill dental composites // Operative dentistry, 43 (2018), 1; E19-E31 doi:10.2341/17-041-L (međunarodna recenzija, članak, znanstveni)


Naslov
Real-time light transmittance monitoring for determining polymerization completeness of conventional and bulk-fill dental composites

Autori
Par, Matej ; Repusic, Igor ; Skenderovic, Hrvoje ; Klaric Sever, Eva ; Marovic, Danijela ; Tarle, Zrinka

Izvornik
Operative dentistry (0361-7734) 43 (2018), 1; E19-E31

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Resin Composite, Bulk-fill Composite, Photopolymerization, Light Transmittance, Curing time

Sažetak
Objectives: To monitor the real-time changes in light transmittance during composite curing and to use transmittance data to determine curing times required for a complete polymerization. Methods: Three conventional and three bulk-fill composites were cured with two LED curing units at layer thicknesses of 2 mm and 4 mm. The real-time light transmittance data were collected by a uv-vis spectrometer in the wavelength range of 350-550 nm, plotted against time (t) and fitted to an exponential function f(t), whose first derivative ΔT(t)=df(t)/dt represented the rate of transmittance change. As the changing transmittance reflects structural changes that occur during polymerization, ΔT(t)>0 was considered to indicate an ongoing polymerization, whereas ΔT(t) values approaching zero suggested a complete polymerization. This principle was used to determine times required for a complete polymerization (tcomplete) for each material/thickness/curing unit combination. Results: Light transmittance was significantly influenced by the material type, sample thickness and curing unit, amounting to 2.9–27.0% for the bulk-fill and 0.7–16.7% for the conventional composites. The values of tcomplete amounted to 15.3–23.3 s for the bulk-fill composites at 2 mm, 20.2–33.3 s for the conventional composites at 2 mm, 26.9–42.1 s for the bulk-fill composites at 4 mm, and 40.1–59.8 s for the conventional composites at 4 mm. Additionally, an exponential relationship was discovered between the light transmittance and tcomplete. Conclusions: Some of the tcomplete values considerably exceeded the curing times recommended by the manufacturers. Clinical relevance: Short curing times of 10–20 s may be insufficient for an optimal polymerization, especially under the non-ideal clinical conditions.

Izvorni jezik
Engleski

Znanstvena područja
Kemija



POVEZANOST RADA


Projekt / tema
HRZZ-SU-08/31 - Prosudba novih bioaktivnih materijala i postupaka u restaurativnoj dentalnoj medicini (Zrinka Tarle, )

Ustanove
Institut za fiziku, Zagreb,
Stomatološki fakultet, Zagreb,
Medicinski fakultet, Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus
  • MEDLINE


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