Shrinkage stress of high and low viscosity bulk-fill composites with incremental and bulk fill techniques

Shebl, Shahenda; Abdel-Karim, Usama M; Abdalla, Ali; Elkafrawy, Hend; Valanezhad, Alierza; Watanabe, Ikuya

doi:10.4103/tdj.tdj_18_18

Cited by 3 publications

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“…Clinical protocols recommend the insertion of conventional composite resins in increments of no more than 2 mm thickness, to proportionally reduce the volumetric contraction of the material, reduce the level of tension developed by polymerization and, therefore, reduce the occurrence of crack formation in the interface with the dental cavity 3 . However, restoration procedures of extensive Class II proximal boxes are challenging mainly because of the difficulty for the light from the photoinitiator to access the area, often compromising polymerization 4,5 .…”

Section: Introductionmentioning

confidence: 99%

Effect of acid challenge and photoactivation distance on microhardness and roughness of flow bulk-fill composite resins

FRANK

Vieira-Júnior

Basting

et al. 2022

Rev. odontol. UNESP

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Introduction composite resins are indicated to the reconstruction of proximal walls and the evaluation of properties of flow bulk-fill composite resins exposed to acid challenge is necessary. Objective to evaluate the microhardness and roughness at different depths of photoactivation of bulk-fill flow composites (Filtek Bulk Fill Flow; SureFil SDR Flow; Tetric N Ceram Bulk fill) and conventional composite resin (control, Filtek Z350 XT) subjected to acid challenge. Material and method forty composites brick shaped specimens (3x3x4 mm) were made using a polyacetal matrix. To simulate pH challenges, the samples were immersed in a demineralizing solution. Each sample had Knoop microhardness (KHN) and roughness (Ra) evaluated at three depths (superficial, medium, and cervical), considering the lateral surface of the sample. Data were submitted to Kruskal-Wallis, Friedman's and Dunn's tests with a significance level of 5%. Result comparing the composites among themselves, in superficial (p=0.693), medium (p=0.053) and cervical (p=0.176) regions, there was no difference in the KHN values. There were also no differences in roughness between the composites in superficial (p=0.356), medium (p=0.734) and cervical (p=0.207) regions. Only the Filtek Z350 XT (p=0.027) showed less difference in KHN in the middle region caused by acid challenge. Changes in roughness showed that the greatest difference was at the cervical region for Bulk Fill Flow SDR (p=0.014) and Tetric N-Ceram Bulk Fill (p = 0.003) with an increase after acid challenge. Conclusion after acid challenge, bulk-fill flow composites showed alterations similar to those presented by the conventional nanoparticulate resin composite.

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Section: Introductionmentioning

confidence: 99%

Effect of acid challenge and photoactivation distance on microhardness and roughness of flow bulk-fill composite resins

FRANK

Vieira-Júnior

Basting

et al. 2022

Rev. odontol. UNESP

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Adaptability of thermo-viscous versus sonicfill-activated bulk fill composite resin restorations

Kandel,

Etman,

Geniad

2023

Tanta Dental Journal

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Purpose To in vitro evaluate the marginal and internal adaptation of Thermo-Viscous versus SonicFill Bulk Fill composite in Class I cavities. Materials and methods Twenty non-carious human maxillary premolar teeth were selected. Class I cavities were prepared with dimensions of 4 mm mesio-distal, 2.5 mm bucco-lingual width and 2 mm depth. Specimens were randomly divided into two equal groups I and II. Cavities were restored with VisCalor and SonicFill Bulk Fill, respectively. Materials were applied using the recommended adhesive and special dispenser. Specimens were then subjected to 500 thermal cycles, labelled and the restoration margins were inspected under stereomicroscope at X70 to detect and measure the marginal gap width. Specimen were then sectioned buccolingually using a microtome to detect and measure the internal gap width. Results Lower mean values of marginal gap width were recorded in VisCalor group compared to SonicFill group, however there was no statistically significant difference (P = 0.187) between both groups. While a significant difference (P = 0.002) was found regarding internal mean gap width values recorded in VisCalor group compared to SonicFill group. Conclusion Both tested materials/techniques used to reduce the viscosity of the bulk fill composites presented nearly comparable marginal integrity results, while VisCalor application technique enhanced the internal adaptation compared to SonicFill method.

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Comparative study of the adaptation of alkasite versus self-adhesive flowable restorations

Nassar,

El-Sayed

2024

Tanta Dental Journal

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Aim To compare the adaptation of self-adhesive flowable composite versus alkasite restorations with or without the use of an adhesive system. Materials and Methods A total of 30 noncarious maxillary premolars were selected and mounted 2 mm below the cemento–enamel junction in acrylic blocks. Trapezoidal class V cavities were prepared on the buccal surface of each tooth. The gingival margins of the prepared cavities were located 1 mm above cemento–enamel junction. All cavity margins were not bevelled. During the experiment time, all samples were kept in artificial saliva renewed daily at 37°C in an incubator to prevent dehydration. These were randomly divided into three groups (n = 10). Alkasite restorative material was applied in a bulk fill technique using a universal adhesive in samples of group I, while those of group II did not have any adhesive using the same restorative material and those of group III were restored using self-adhesive flowable composite (vertise flow). Specimens of the three tested groups were subjected to 500 thermal cycles from 5 to 55°C with 30 s. Dwell time and 15 s transfer time. They were all immersed in methylene blue dye 2% for 24 h in an incubator. Then all samples were examined under stereomicroscopy at ×40 to determine the percentage of gap free length along the entire margins. All specimens were then sectioned buccolingually to detect the percentage of internal gap length along the restoration/tooth interface. Results Regarding the marginal adaptation, the highest % of marginal free gap was recorded for group I, while the lowest was recorded for group II. Concerning the internal adaptation, it was found that the highest % of free gap was related to group I and III while the lowest was related to group II. Comparing the marginal versus internal % of gap free margins it was found that group I versus II showed a statistically significant difference. Also, group III versus II showed a significant difference. While group I versus III recorded no statistically significant difference. This was true at both marginal and internal % of free gaps. These findings indicated the responsibility of group II for the recorded differences since group II showed the least % of free gap margins and the highest percentage of total dye penetration values. Conclusions Within the limitations of this in vitro study, the adhesive system was effective in increasing the percentage of free gaps of tested groups whether marginal or internal. Recommendations The use of any composite material is not recommended without an adhesive system. Further in vitro studies providing more precise gap measurement are required.

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Shrinkage stress of high and low viscosity bulk-fill composites with incremental and bulk fill techniques

Cited by 3 publications

References 0 publications

Effect of acid challenge and photoactivation distance on microhardness and roughness of flow bulk-fill composite resins

Effect of acid challenge and photoactivation distance on microhardness and roughness of flow bulk-fill composite resins

Adaptability of thermo-viscous versus sonicfill-activated bulk fill composite resin restorations

Comparative study of the adaptation of alkasite versus self-adhesive flowable restorations

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