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Objectives: to determine the degree of conversion (DC) of two nano-hybrid resin-composites with novel monomer components based on dimer-acid-derivates (h-Da) and tricyclodecane-urethane (TCD-urethane) structure in comparison to three nano-hybrid materials containing conventional matrices.
Materials and Methods: DC was evaluated in real-time (5min, 2spectra/s) by an FTIR-spectrometer with attenuated total reflectance (ATR) accessory at 0.1mm, 2mm and 6mm depth at varying irradiation times (10s, 20s, 40s, LED Freelight2, 1,241 mW/cm²) and layering-techniques (bulk, incremental).
Results: were compared using one- and multiple-way ANOVA and Tukey HSD post-hoc test (α=0.05) and partial eta-squared statistic. Statistical analysis was made respectively within one geometry (vertically, shown by the superscript letters in the table, e.g. A, B or α, β), as well as within all geometries for each material and irradiation time (horizontally, shown by star-symbols). Specimen geometry revealed a strong effect on DC (η2=0.90) followed by curing time (η2=0.39).
Material | Time[s] | DC0.1mm[%] | DC2mm[%] | DC6mm bulk[%] | DC6mm incr.[%] |
Miris2/Coltène-Whaledent | 10 | 52.00CD***(2.38) | 49.06b**(1.74) | 3.98ΑΒ*(3.61) | 47.85βγ**(1.87) |
20 | 53.62DE***(1.56) | 54.39cd***(3.20) | 26.32E*(3.87) | 46.52β,γ,d**(11.93) | |
40 | 54.26DE **(1.47) | 56.14de**(1.46) | 41.42G*(5.04) | 55.03ε **(1.51) | |
N'Durance/Septodont | 10 | 58.93F***(1.72) | 56.77de**,***(2.47) | 17.45D*(7.91) | 54.18ε,ζ**(2.65) |
20 | 59.27F**,***(1.41) | 59.67ef***(1.46) | 36.41F*(5.90) | 56.50 ζ,η**(3.47) | |
40 | 60.91F**(2.20) | 58.69ef**(3.64) | 50.39H*(3.41) | 60.00η**(2.40) | |
Premise/Kerr | 10 | 60.48F****(3.69) | 54.37cd ***(4.17) | 3.32AB*(3.32) | 42.58αβγ **(7.26) |
20 | 61.45F****(2.04) | 58.46ef***(2.07) | 1.18A*(1.69) | 55.86ζ,η**(4.77) | |
40 | 61.58 **(2.93) | 61.03f**(2.22) | 13.87CD*(7.46) | 57.79 ζ,η **(2.86) | |
Simile/Jeneric Pentron | 10 | 54.72DE ***(2.12) | 44.17a**(4.59) | 3.11AB*(3.09) | 41.95αβ**(2.30) |
20 | 54.90DE ****(2.15) | 51.18bc***(2.82) | 9.08BC*(5.21) | 46.25βγd **(2.38) | |
40 | 55.56E ***(2.08) | 50.98bc**(1.78) | 25.81E *(4.75) | 50.15dε**(4.65) | |
Venus Diamond/Kulzer | 10 | 46.80A***(4.31) | 44.20a***(6.82) | 11.26CD*(6.67) | 38.07α**(4.07) |
20 | 47.41AB***(4.12) | 49.37b***(4.34) | 26.66E *(7.15) | 42.73αβγ**(4.41) | |
40 | 49.94BC***(3.81) | 50.57bc***(3.61) | 31.26EF*(7.65) | 45.52βγd**(3.42) |
Conclusions: increments of 2mm and irradiation-time of at least 20s still must be recommended for clinical practice. The two materials containing novel monomer-composition might be applied for enlarged increments because of the low decrease of DC they demonstrated.
Keywords: Biomaterials, Curing lights and Dental materials