Polymerization shrinkage and shrinkage force kinetics of high- and low-viscosity dimethacrylate- and ormocer-based bulk-fill resin composites

Tauböck, Tobias T.; Jäger, Franziska; Attin, Thomas

doi:10.1007/s10266-018-0369-y

Cited by 79 publications

(69 citation statements)

References 55 publications

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“…The degree of conversion is an essential material characteristic of dental resin composites, affecting both physical and mechanical as well as biological polymer properties [34][35][36][37][38][39][40][41]. In the current study, the added micro-fillers did not affect the degree of conversion at the specimens' top surface, irrespective of the bulk-fill composite used.…”

Section: Discussionmentioning

confidence: 49%

Light Transmittance and Polymerization of Bulk-Fill Composite Materials Doped with Bioactive Micro-Fillers

et al. 2019

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This study investigated the effect of bioactive micro-fillers on the light transmittance and polymerization of three commercially available bulk-fill resin composites. These were mixed with 20 wt% bioactive glass 45S5, Portland cement, inert dental barium glass, or nothing (controls). Composites were photo-activated and light transmittance through 4 mm thick specimens was measured in real time. Moreover, degree of conversion (DC) and Knoop hardness (KHN) were assessed. Light transmittance of all bulk-fill composites significantly decreased (p < 0.05) with addition of 20 wt% bioactive glass 45S5 but not when inert barium glass was added. For bulk-fill composites modified with Portland cement, light irradiance dropped below the detection limit at 4 mm depth. The DC at the top surface of the specimens was not affected by addition of bioactive or inert micro-fillers. The bottom-to-top ratio of both DC and KHN surpassed 80% for bulk-fill composites modified with 20 wt% bioactive or inert glass fillers but fell below 20% when the composites were modified with Portland cement. In contrast to Portland cement, the addition of 20 wt% bioactive glass maintains adequate polymerization of bulk-fill composites placed at 4 mm thickness, despite a decrease in light transmittance compared to the unmodified materials.

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Section: Discussionmentioning

confidence: 49%

Light Transmittance and Polymerization of Bulk-Fill Composite Materials Doped with Bioactive Micro-Fillers

et al. 2019

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“…Although the remarkable development of dental resin composites during the last two decades had led to their mechanical properties and esthetics plateauing at a high level [1,2], the issue of secondary caries has still not been appropriately addressed [3]. Therefore, the true potential for further improvements of this material class lies in introducing the capability of preventing secondary caries formation [4].…”

Section: Introductionmentioning

confidence: 99%

Bioactivity and Physico-Chemical Properties of Dental Composites Functionalized with Nano- vs. Micro-Sized Bioactive Glass

Odermatt

Par

Mohn

et al. 2020

JCM

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Bioactive resin composites can contribute to the prevention of secondary caries, which is one of the main reasons for failure of contemporary dental restorations. This study investigated the effect of particle size of bioactive glass 45S5 on chemical and physical composite properties. Four experimental composites were prepared by admixing the following fillers into a commercial flowable composite: (1) 15 wt% of micro-sized bioactive glass, (2) 15 wt% of nano-sized bioactive glass, (3) a combination of micro- (7.5 wt%) and nano-sized (7.5 wt%) bioactive glass, and (4) 15 wt% of micro-sized inert barium glass. Hydroxyapatite precipitation and pH rise in phosphate-buffered saline were evaluated during 28 days. Degree of conversion and Knoop microhardness were measured 24 h after specimen preparation and after 28 days of phosphate-buffered saline immersion. Data were analyzed using non-parametric statistics (Kruskal–Wallis and Wilcoxon tests) at an overall level of significance of 5%. Downsizing the bioactive glass particles from micro- to nano-size considerably improved their capability to increase pH. The effect of nano-sized bioactive glass on degree of conversion and Knoop microhardness was similar to that of micro-sized bioactive glass. Composites containing nano-sized bioactive glass formed a more uniform hydroxyapatite layer after phosphate-buffered saline immersion than composites containing exclusively micro-sized particles. Partial replacement of nano- by micro-sized bioactive glass in the hybrid composite did not impair its reactivity, degree of conversion (p > 0.05), and Knoop microhardness (p > 0.05). It is concluded that downsizing bioactive glass particles to nano-size improves the alkalizing potential of experimental composites with no negative effects on their fundamental properties.

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“…Flowable bulk‐fill resin composites, light‐cured (SDR) or dual‐cured (Core‐X Flow), provided a similar fracture strength of ETT to the conventional resin composite (Ceram‐X SphereTEC). The flowable bulk‐fill resin composites contain a higher amount of resin matrix, so a higher polymerization shrinkage volume is expected . However, SDR contains a specialized low‐shrinkage resin matrix and has a low modulus of elasticity that may decrease polymerization shrinkage stress .…”

Section: Discussionmentioning

confidence: 99%

“…is expected. 19 However, SDR contains a specialized low-shrinkage resin matrix and has a low modulus of elasticity that may decrease polymerization shrinkage stress. 20 Moreover, the dual-cured core build-up material had a slower rate of polymerization that allows the material to "flow" during the gel stage and will distribute the stresses TA B L E 2 Load to fracture (N, mean ± SD) of ETT molars restored with 3 resin composites (SDR, Core-X Flow and Ceram-X SphereTEC) with (B) or without (NB) a GIC base at the bonded interface.…”

Section: Re Sultsmentioning

confidence: 99%

Fracture resistance, gap and void formation in root‐filled mandibular molars restored with bulk‐fill resin composites and glass‐ionomer cement base

Thongbai‐on

Chotvorrarak

Banomyong

et al. 2019

J of Invest & Clin Dent

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Aim To evaluate fracture resistance and gap/void presence of root‐filled mandibular molars restored with 2 bulk‐fill and 1 conventional resin composites, with or without a glass‐ionomer cement (GIC) base. Methods Coronal access and mesio‐occlusal (MO) cavities were prepared, then root canal treatment was performed on 30 mol/L. The teeth were randomly divided, according to the cavity volume, into 6 experimental groups (N = 5) and restored with conventional/light‐cured (Ceram‐X), bulk‐fill/light‐cured (SureFil SDR) or bulk‐fill/dual‐cured (Core‐X Flow) with/without a 2‐mm thick GIC base. Gaps and voids (%) were determined using microcomputed tomography. Intact teeth and unrestored teeth were used as negative and positive controls. Fracture load (N) was determined using a universal testing machine. Results No significant difference in fracture resistance or gap/void formation was found among the 3 resin composites. GIC‐base groups revealed significantly lower fracture strength than intact teeth, while fracture strengths of no GIC‐base groups were not significantly different from intact teeth. GIC‐base groups revealed significantly more gaps and voids in the area of the GIC than the resin composite. Conclusion Conventional and bulk‐fill resin composites provided similar fracture resistance and gaps/voids in root‐filled molars with MO cavities. Placing a GIC base decreased fracture resistance and increased gap/void formation.

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Polymerization shrinkage and shrinkage force kinetics of high- and low-viscosity dimethacrylate- and ormocer-based bulk-fill resin composites

Cited by 79 publications

References 55 publications

Light Transmittance and Polymerization of Bulk-Fill Composite Materials Doped with Bioactive Micro-Fillers

Light Transmittance and Polymerization of Bulk-Fill Composite Materials Doped with Bioactive Micro-Fillers

Bioactivity and Physico-Chemical Properties of Dental Composites Functionalized with Nano- vs. Micro-Sized Bioactive Glass

Fracture resistance, gap and void formation in root‐filled mandibular molars restored with bulk‐fill resin composites and glass‐ionomer cement base

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