Composite Photopolymerization with Diode Laser

Knežević, Andrea; Ristić, Mira; Demoli, Nazif; Tarle, Zrinka; Musić, Svetozar; Mandić, Višnja Negovetić

doi:10.2341/06-79

Cited by 17 publications

(13 citation statements)

References 14 publications

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“…However, only a few studies have evaluated the applicability of 473 nm in the polymerization of light-curing dental restorative materials. [13][14][15][16] Polymerization shrinkage occurs when the monomers convert to a polymer network. At that time, the molecular spacing reduces as a result of polymerization.…”

Section: Discussionmentioning

confidence: 99%

“…However, there are few reports on the application of DPSS lasers to the light curing of dental restorative materials in dentistry. [13][14][15][16] The purpose of this study was to evaluate the polymerization shrinkage and mass change in dental resin composites that were light cured using the DPSS laser. The testing hypothesis was that the DPSS laser of 473 nm can light cure resin composites to the level that was achieved by the QTH light source through the effective activation of CQ.…”

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confidence: 99%

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Influence of DPSS Laser on Polymerization Shrinkage and Mass Change of Resin Composites

Shin

Yun

Park

et al. 2011

Photomedicine and Laser Surgery

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Objectives: This study evaluated the effectiveness of the diode-pumped solid state (DPSS) laser as a light source for light-curing dental resin composites. Background data: A DPSS laser of 473 nm may be useful because of its match with the absorption peak of camphorquinone (CQ), the photoinitiator. Materials and methods: A DPSS laser (LAS) of 473 nm and a quartz-tungsten-halogen (QTH) light-curing unit (OP) were used as the light sources for light curing six different resin composites (four nanocomposites and two hybrid composites). Polymerization shrinkage and mass change (water sorption and solubility) were measured during and after light curing to determine the degree of polymerization. Mass change was evaluated by following the ISO 4049 standard. Results: According to the evaluation, the specimens light cured using LAS showed similar maximum polymerization shrinkage (12.3*18.1 mm for LAS; 13.2*16.2 mm for OP) and water sorption (11.4*24.1 mg/ mm 3 for LAS; 11.3*22.8 mg/ mm 3 for OP) to the cases light cured using OP. The specimens light cured using LAS showed a significantly higher solubility than the cases light cured using OP (2.4*6.6 mg/ mm 3 for LAS; 0.8*1.6 mg/ mm 3 for OP). However, the maximum water sorption and solubility obtained from the specimens were lower than the values permitted by the ISO 4049 standard. Conclusions: The results may suggest that the DPSS laser with an emission wavelength of 473 nm can be used as a light source for light-curing dental resin composites.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Influence of DPSS Laser on Polymerization Shrinkage and Mass Change of Resin Composites

Shin

Yun

Park

et al. 2011

Photomedicine and Laser Surgery

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“…The advantages of DPSS lasers are their compactness, efficiency, and low cost compared to other lasers. However, there are few reports on the application of DPSS lasers for the light curing of dental restorative materials [21].…”

Section: Introductionmentioning

confidence: 99%

Microhardness and polymerization shrinkage of flowable resins that are light cured using a blue laser

et al. 2011

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This study evaluated the microhardness and polymerization shrinkage of flowable resins that are cured using different light sources. Seven flowable resins and two light sources (diode-pumped solid-state (DPSS) laser (LAS) and Optilux 501 (OP)) were chosen for the study. To evaluate the microhardness, a mold (height: 2 mm, inner diameter: 4 mm) was filled with resin and then light cured. The microhardness was measured at the top and bottom surfaces after aging for 24 h. The level of polymerization shrinkage was evaluated for 130 s (during and after the light curing) by measuring the dimensions of the cylindrical shape resin filling. The light intensity of the LAS and OP was approximately 520 mW/cm(2) and 800 mW/cm(2), respectively. The data for the microhardness and polymerization shrinkage were analyzed statistically. The microhardness (Hv) of the specimens at the top and bottom surface ranged from 25.3 ± 0.6 to 55.3 ± 1.0 and 28.0 ± 2.6 to 63.0 ± 2.3, respectively. Admira flow, Grandio flow, and Filtek Z350 flow showed a slightly higher microhardness at the bottom surface than that at the top surface. The degree of polymerization shrinkage (μm) of the specimens ranged from 30.5 ± 1.3 to 45.9 ± 0.6 for LAS and from 35.1 ± 1.5 to 47.1 ± 1.0 for OP. The values obtained using LAS and OP showed a statistical difference, but in many cases, the difference between the absolute values was minor.

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“…Nevertheless, DPSS lasers have few applications in dentistry in their recent introduction. 21 The present study examined the effectiveness of the blue DPSS laser as a light-curing source for the direct bonding of orthodontic brackets to the teeth. Its effectiveness was determined by evaluating the shear bond strength (SBS) and compared with that obtained by the conventional QTH light.…”

Section: Introductionmentioning

confidence: 99%

Effect of a DPSS laser on the shear bond strength of ceramic brackets with different base designs

Park

et al. 2012

Lasers Med Sci

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This study evaluated the shear bond strength (SBS) and adhesive remnant index (ARI) of ceramic brackets with different base designs using a 473-nm diode-pumped solid-state (DPSS) laser to test its usefulness as a light source. A total of 180 caries-free human premolars were divided into four groups according to the base designs: microcrystalline, crystalline particle (CP), dovetail, and mesh. For each base design, teeth were divided into three different subgroups for light curing using three different light-curing units (LCUs) (quartz-tungsten-halogen unit, light-emitting diode unit, and a DPSS laser of 473 nm). Applied light intensities for the DPSS laser and the other LCUs were approximately 630 and 900 mW/cm(2), respectively. Stainless steel brackets with a mesh design served as controls. The failure modes of debonded brackets were scored using ARI. As a result, brackets bonded using the DPSS laser had the highest SBS values (16.5-27.3 MPa) among the LCUs regardless of base design. Regarding base designs, the CP groups showed the highest SBS values (22.9-27.3 MPa) regardless of LCU. Furthermore, stainless steel brackets with a mesh design had the lowest SBS values regardless of LCU. In many cases, brackets bonded using the DPSS laser had higher ARI scores and had more adhesive on their bases than on tooth surfaces. The study shows that the 473-nm DPSS laser has considerable potential for bonding ceramic brackets at lower light intensities than the other light-curing units examined.

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Composite Photopolymerization with Diode Laser

Abstract: SUMMARY

Cited by 17 publications

References 14 publications

Influence of DPSS Laser on Polymerization Shrinkage and Mass Change of Resin Composites

Influence of DPSS Laser on Polymerization Shrinkage and Mass Change of Resin Composites

Microhardness and polymerization shrinkage of flowable resins that are light cured using a blue laser

Effect of a DPSS laser on the shear bond strength of ceramic brackets with different base designs

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