Pregled bibliografske jedinice broj: 907480
Real-time light transmittance monitoring for determining polymerization completeness of conventional and bulk-fill dental composites
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)
CROSBI ID: 907480 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Real-time light transmittance monitoring for determining polymerization completeness of conventional and bulk-fill dental composites
Autori
Par, Matej ; Repušić, Igor ; Skenderović, Hrvoje ; Klarić Sever, Eva ; Marović, 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
Projekti:
HRZZ-08/31 - Prosudba novih bioaktivnih materijala i postupaka u restaurativnoj dentalnoj medicini (Tarle, Zrinka; Moguš-Milanković, Andrea; Demoli, Nazif, HRZZ ) ( CroRIS)
Ustanove:
Institut za fiziku, Zagreb,
Stomatološki fakultet, Zagreb,
Medicinski fakultet, Zagreb
Profili:
Danijela Marović
(autor)
Zrinka Tarle
(autor)
Matej Par
(autor)
Hrvoje Skenderović
(autor)
Eva Klarić Sever
(autor)
Citiraj ovu publikaciju:
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