The degree of conversion and class II cavity microleakage of different bulk fill composites placed with different restorative techniques

Habib, A. Nour A.; Waly, Gihan H.

doi:10.1016/j.fdj.2018.06.003

Cited by 12 publications

(14 citation statements)

References 16 publications

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“…This was in agreement with Jaganath et al (38), who found that incremental Filtek Z350 XT showed the highest interfacial gap formation among the tested groups (bulk-fill flowable composite(SDR) and nano-hybrid flowable composite). This was in contrast with the work of Habib et al (39), who stated that no significant difference was found between the microleakage scores of the incremental Filtek Z350 XT compared to bulk-fill composites placed using different restorative techniques (Filtek bulk-fill, Filtek bulk-fill flowable and SonicFillTM composites). Their explanation was that the the Filtek bulk-fill composite is mainly based on UDMA while the incremental Z350 XT composite contains BisGMA in addition to the UDMA.…”

Section: Discussioncontrasting

confidence: 96%

Effect of Composite Preheating and Placement Techniques on Marginal Integrity of Class v Restorations

Moustafa

El-Fattah

Al-Abbassy

2020

Alexandria Dental Journal

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INTRODUCTION: Different placement techniques of resin-based composite (RBC) systems have been developed to improve the marginal adaptation and reduce microleakage. These techniques included preheating and vibration of resin composite materials. OBJECTIVES: The current study aimed to investigate the effect of preheating and placement techniques on microleakage and marginal gap formation of class V composite restorations. MATERIALS AND METHODS: A total of eighty sound extracted human molars were used in this study. Standard class V cavities were prepared on their buccal surfaces (4mm mesiodistally, 3mm occlusocervically, and 3 mm pulpal depth). The teeth were divided into 4 groups (n=20): Group I: restored with Filtek bulk fill flowable composite, Group II: restored with Filtek bulk fill composite after it was heated to 60°C using Calset device, Group III: restored with Filtek bulk fill composite adapted with a vibrating instrument (Compothixo), Group IV: restored with Filtek Z350 XT. Specimens were light cured, thermocycled between (5 ºC and 55 ºC in water) and marginal gaps assessment was measured under a stereomicroscope and measured in micrometers. Then teeth were dyed with 0.5% basic fuchsin dye for 24 hours. The dyed specimens were sectioned in the buccolingual direction and evaluated for microleakage (dye penetration) using a stereomicroscope. RESULTS: For marginal gap assessment, results revealed a significant difference between the tested groups, where flowable bulk-fill showed the lowest statistically significant marginal gaps compared to other groups at the occlusal and gingival margins (p<0.05). For the microleakage test, the groups showed more microleakage at gingival margins compared to occlusal margins, flowable bulk-fill and preheated bulk-fill showed the lower microleakage scores among groups. CONCLUSIONS: None of the placement techniques produced gap-free margins. Flowable bulk-fill composite and preheated composite preserved better marginal integrity and reduced microleakage.

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Section: Discussioncontrasting

confidence: 96%

Effect of Composite Preheating and Placement Techniques on Marginal Integrity of Class v Restorations

Moustafa

El-Fattah

Al-Abbassy

2020

Alexandria Dental Journal

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“…In addition, the application method can also be a determinant factor for the success of restoration. The literature reports that conventional incrementally placed composite has a higher degree of conversion compared to bulk-fill materials, and that the bulk-fill material presents a microleakage potential similar to the conventional resin composite [ 41 ]. The present study complements these findings, suggesting that the bulk-fill and bulk-fill flowable composites are more interesting options to be used as filling materials in endocrown treatment, associating the reported literature benefits [ 40 , 41 ] with reduced stress concentration at the adhesive interface when compared with conventional resin composite.…”

Section: Discussionmentioning

confidence: 99%

Lithium Disilicate Ceramic Endocrown Biomechanical Response According to Different Pulp Chamber Extension Angles and Filling Materials

et al. 2021

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The purpose of this study is to evaluate the effect of pulp chamber extension angles and filling material mechanical properties on the biomechanical response of a ceramic endocrown. A 3D model of maxillary molar that underwent endodontically treatment was exported to computer aided design software to conduct finite element analysis (FEA). The endocrown model was modified considering different pulp chamber extension angles (right angle; 6°, 12° and 18° of axial divergence). The solids were imported into the computer aided engineering software in Standard for the Exchange of Product Data (STEP) format. Nine different filling materials were simulated to seal the orifice of the root canal system under each endocrown restoration (resin composite, bulk-fill resin composite, alkasite, flowable resin composite, glass ionomer cement, autocured resin-reinforced glass ionomer cement, resin cement, bulk-fill flowable resin composite, zinc oxide cement), totaling 36 models. An axial load (300 N) was applied at the occlusal surface. Results were determined by colorimetric graphs of von-Misses stress (VMS) and Maximum Principal Stress (MPS) on tooth, cement layer, and endocrown restorations. VMS distribution showed a similar pattern between the models, with more stress at the load region for the right-angled endocrowns. The MPS showed that the endocrown intaglio surface and cement layer showed different mechanical responses with different filing materials and pulp chamber angles. The stress peaks plotted in the dispersion plot showed that the filling material stiffness is proportional to the stress magnitude in the endocrown, cement layer and tooth adhesive surface. In addition, the higher the pulp chamber preparation angle, the higher the stress peak in the restoration and tooth, and the lower the stress in the cement layer. Therefore, 6° and 12° pulp chamber angles showed more promising balance between the stresses of the adhesive interface structures. Under the conditions of this study, rigid filling materials were avoided to seal the orifice of root canal system when an endocrown restoration was planned as rehabilitation. In addition, the pulp chamber axial walls were prepared between 6° and 12° of divergence to balance the stress magnitude in the adhesive interface for this treatment modality.

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“…Inadequate DC% might cause increased cytotoxity,[ 20 ] increased wear, increased marginal breakdown,[ 10 ] and increased microleakage. [ 9 ]…”

Section: Discussionmentioning

confidence: 99%

“…The DC% may be a critical factor that greatly influences several properties associated with the composite restoration longevity such as solubility, color stability, mechanical properties, and even biocompatibility. [ 9 ] The minimum DC% for a clinically satisfactory restoration has not yet been established precisely. Nevertheless, an indirect correlation of in vivo abrasive wear depth with DC has been established for DC values within the range of 55%–65%.…”

Section: Introductionmentioning

confidence: 99%

Comparative evaluation of the degree of conversion of four different composites polymerized using ultrafast photopolymerization technique: An in vitro study

et al. 2021

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Context: Lower degree of conversion (DC%) of monomer to polymer in a resin composite restoration could be a health hazard for the patient as well as it could affect the longevity of the restoration. Aims: This study is aimed to compare and evaluate the DC% of four different composites polymerized using ultrafast photopolymerization. Settings and Design: In-vitro study. Materials and Methods: A total of 40 disc-shaped composite samples were used in the study. Twenty samples were prepared for each group using 2 mm height and 6 mm diameter Tygon tube as a matrix. All of the composites were cured using the Woodpecker i Led light-curing unit with an intensity of 2300–2500 mW/cm 2 (TURBO mode). Samples in Group 1 were cured for 1 s and samples in Group 2 were cured for 3 s. Each group had 4 subgroups of five samples of the 4 resin composites tested. After photo-activation, the specimens were stored under dark dry conditions at room temperature for 24 h before testing. The DC% was measured using Fourier-transform infrared spectroscopy. Statistical Analysis Used: The DC% were analyzed using ANOVA, and Tukey HSD post hoc test using IBM SPSS 21 software. Results: Among the experimental groups, Group 2 showed a higher DC% which ranges from 93.7% to 95.4% than Group 1 which ranges from 58.5% to 65.5%. There was a statistically significant difference in the DC% among the materials tested ( P < 0.05). Conclusions: Within the limitations of the study, it was concluded that composites cured for 3 s showed a higher DC% which ranges from 93.7% to 95.4% than those cured for 1 s. The DC% also varied among the four different composites tested.

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The degree of conversion and class II cavity microleakage of different bulk fill composites placed with different restorative techniques

Cited by 12 publications

References 16 publications

Effect of Composite Preheating and Placement Techniques on Marginal Integrity of Class v Restorations

Effect of Composite Preheating and Placement Techniques on Marginal Integrity of Class v Restorations

Lithium Disilicate Ceramic Endocrown Biomechanical Response According to Different Pulp Chamber Extension Angles and Filling Materials

Comparative evaluation of the degree of conversion of four different composites polymerized using ultrafast photopolymerization technique: An in vitro study

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