Functionalizing a dentin bonding resin to become bioactive

Tauböck, Tobias T.; Zehnder, Matthias; Schweizer, T.; Stark, Wendelin J.; Attin, Thomas; Mohn, Dirk

doi:10.1016/j.dental.2014.05.029

Cited by 76 publications

(105 citation statements)

References 34 publications

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“…Thus, higher DC does not necessarily result in higher mechanical properties [64,65]. In any case, KHN measurements do not provide any quantitative information on the actual change in reactive groups.…”

Section: Discussionmentioning

confidence: 95%

Influence of irradiation time on subsurface degree of conversion and microhardness of high-viscosity bulk-fill resin composites

et al. 2014

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OBJECTIVES To evaluate the influence of irradiation time on degree of conversion (DC) and microhardness of high-viscosity bulk-fill resin composites in depths up to 6 mm. MATERIALS AND METHODS Four bulk-fill materials (Tetric EvoCeram Bulk Fill-TECBF; x-tra fil-XF; QuixFil-QF; SonicFill-SF) and one conventional nano-hybrid resin composite (Tetric EvoCeram-TEC) were irradiated for 10, 20, or 30 s at 1,170 mW/cm(2). DC and Knoop microhardness (KHN) were recorded after 24-h dark storage at five depths: 0.1, 2, 4, 5, and 6 mm. Data were statistically analyzed using ANOVA and Bonferroni's post-hoc test ( = 0.05). RESULTS With increasing bulk thickness, DC and KHN significantly decreased for TEC. TECBF and SF showed a significant decrease in DC and KHN at 4-mm depth after 10-s irradiation, but no decrease in DC after 30-s irradiation (p > 0.05). XF and QF demonstrated no significant DC decrease at depths up to 6 mm after irradiation of at least 20 s. At 4-mm depth, all materials tested achieved at least 80 % of their maximum DC value, irrespective of irradiation time. However, at the same depth (4 mm), only XF and QF irradiated for 30 s achieved at least 80 % of their maximum KHN value. CONCLUSIONS Regarding DC, the tested bulk-fill resin composites can be safely used up to at least 4-mm incremental thickness. However, with respect to hardness, only XF and QF achieved acceptable results at 4-mm depth with 30 s of irradiation. CLINICAL RELEVANCE Minimum irradiation times stated by the manufacturers cannot be recommended for placement of highviscosity bulk-fill materials in 4-mm increments. Conclusions: Regarding DC, the tested bulk-fill resin composites can be safely used up to at least 4-mm incremental thickness. However, with respect to hardness, only XF and QF achieved acceptable results at 4-mm depth with 30 s of irradiation.Clinical relevance: Minimum irradiation times stated by the manufacturers cannot be recommended for placement of high-viscosity bulk-fill materials in 4-mm increments.

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Section: Discussionmentioning

confidence: 95%

Influence of irradiation time on subsurface degree of conversion and microhardness of high-viscosity bulk-fill resin composites

et al. 2014

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“…15 The degree of double bond conversion is a key material feature of dental resin composites, because it affects both physical and mechanical polymer properties as well as biocompatibility. 48 The effect of temperature on the extent of polymerization has been demonstrated to depend strongly on the photoinitiator system used. 54 Isolation of the operative field by a rubber dam is highly recommended when placing direct adhesive restorations.…”

Section: Discussionmentioning

confidence: 99%

Pre-heating of high-viscosity bulk-fill resin composites: Effects on shrinkage force and monomer conversion

Tauböck

Tarle

Marović

et al. 2015

Journal of Dentistry

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108

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“…8,15 When it comes to determine the depth of cure by the VH profiles along the depth of a specimen, one school of thought is to accept the depth where the hardness value attains 80% of the maximum VH measured near the top surface exposed to light curing. 21,22 In this study, maximum VH has been achieved at the bottom surface for all materials tested, the 80% rule, which use the hardness of top surface would not be meaningful. Should the approach used in this study become acceptable, a definitive number may be established for determining the depth of cure.…”

Section: Discussionmentioning

confidence: 99%

Comparing depth-dependent curing radiant exposure and time of curing of regular and flow bulk-fill composites

et al. 2017

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The effect of restoration depth on the curing time of a conventional and two bulk-fill composite resins by measuring microhardness and the respective radiosity of the bottom surface of the specimen was investigated. 1-, 3-and 5-mm thick washers were filled with Surefil SDR Flow-U (SDR), Tetric EvoCeram Bulk Fill-IVA (TEC) or Esthet-X HD-B1 (EHD), and cured with Bluephase ® G2 for 40s. Additional 1-mm washers were filled with SDR, TEC or EHD, placed above the light sensor of MARC ® , stacked with pre-cured 1-, 3-or 5-mm washer of respective material, and cured for 2.5~60s to mimic 2-, 4-and 6-mm thick composite curing. The sensor measured the radiosity (E B ) at the bottom of specimen stacks. Vickers hardness (VH) was measured immediately at 5 locations with triplicate specimens. Nonlinear regression of VH vs E B by VH=α[1-exp(-E B /β)] with all thickness shows that the values of α, maximum hardness, are 21.6±1.0 kg/mm 2 for SDR, 38.3±0.6 kg/mm 2 for TEC and 45.3±2.6 kg/mm 2 for EHD, and the values of β, rate parameter, are 0.40±0.06 J/cm 2 for SDR, 0.77±0.04 J/cm 2 for TEC and 0.58±0.09 J/cm 2 for EHD. The radiosity of the bottom surface was calculated when the bottom surface of each material attained 80% of α of each material. The curing times for each material are in agreement with manufacturer recommendation for thickness. It is possible to estimate time needed to cure composite resin of known depth adequately by the radiosity and microhardness of the bottom surface.

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Functionalizing a dentin bonding resin to become bioactive

Cited by 76 publications

References 34 publications

Influence of irradiation time on subsurface degree of conversion and microhardness of high-viscosity bulk-fill resin composites

Influence of irradiation time on subsurface degree of conversion and microhardness of high-viscosity bulk-fill resin composites

Pre-heating of high-viscosity bulk-fill resin composites: Effects on shrinkage force and monomer conversion

Comparing depth-dependent curing radiant exposure and time of curing of regular and flow bulk-fill composites

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