Restorative Dentistry & Endodontics

Hassan Torabzadeh

4 Articles

Effects of 3 different light-curing units on the physico-mechanical properties of bleach-shade resin composites: Azin Farzad, Shahin Kasraei, Sahebeh Haghi, Mahboubeh Masoumbeigi, Hassan Torabzadeh, Narges Panahandeh; Restor Dent Endod 2022;47(1):e9. Published online February 7, 2022; DOI: https://doi.org/10.5395/rde.2022.47.e9

Objectives

This study investigated the microhardness, flexural strength, and color stability of bleach-shade resin composites cured with 3 different light-curing units.

Materials and Methods

In this in vitro experimental study, 270 samples were fabricated of bleach and A2 shades of 3 commercial resin composites (Point 4, G-aenial Anterior, and Estelite Sigma Quick). Samples (n = 5 for each trial) were cured with Bluephase N, Woodpecker LED.D, and Optilux 501 units and underwent Vickers microhardness and flexural strength tests. The samples were tested after 24 hours of storage in distilled water. Color was assessed using a spectrophotometer immediately after preparation and 24 hours after curing. Data were analyzed using 3-way analysis of variance and the Tukey test (p ≤ 0.001).

Results

Samples cured with Optilux exhibited the highest and those cured with LED.D exhibited the lowest microhardness (p = 0.023). The bleach shade of Point 4 composite cured with Optilux displayed the highest flexural strength, while the same composite and shade cured with Sigma Quick exhibited the lowest (p ≤ 0.001). The color change after 24 hours was greatest for the bleach shade of G-aenial cured with Bluephase N and least for the A2 shade of Sigma Quick cured with Optilux (p ≤ 0.001).

Conclusions

Light curing with polywave light-emitting diode (LED) yielded results between or statistically similar to those of quartz-tungsten-halogen and monowave LED in the microhardness and flexural strength of both A2 and bleach shades of resin composites. However, the brands of light-curing devices showed significant differences in color stability.

Citations

Citations to this article as recorded by

Mechanical Behaviour of Novel Nanohybrid Resin Composite Using Two Light Cure Systems
Ghada H. Naguib, Jumana Mazhar, Abeer Alnowaiser, Abdulghani Mira, Hisham Mously, Rabab Aljawi, Samar H. Abuzinadah, Mohamed T. Hamed
International Dental Journal.2025; 75(2): 1136. CrossRef
Evaluation of the Depth of Cure by Microhardness of Bulk-Fill Composites with Monowave and Polywave LED Light-Curing Units
Socratis Thomaidis, Dimitris Kampouropoulos, Maria Antoniadou, Afrodite Kakaboura
Applied Sciences.2024; 14(24): 11532. CrossRef
Effect of hard segment chemistry and structure on the self‐healing properties of UV‐curable coatings based on the urethane acrylates with built‐in Diels–Alder adduct
Paulina Bednarczyk, Karolina Mozelewska, Małgorzata Nowak, Joanna Klebeko, Joanna Rokicka, Paula Ossowicz‐Rupniewska
Journal of Applied Polymer Science.2023;[Epub] CrossRef
Effects of Dental Bleaching Agents on the Surface Roughness of Dental Restoration Materials
Alexandru Dan Popescu, Mihaela Jana Tuculina, Oana Andreea Diaconu, Lelia Mihaela Gheorghiță, Claudiu Nicolicescu, Cristian Niky Cumpătă, Cristiana Petcu, Jaqueline Abdul-Razzak, Ana Maria Rîcă, Ruxandra Voinea-Georgescu
Medicina.2023; 59(6): 1067. CrossRef
Effect of Polywave and Monowave Light Curing Units on Color Change of Composites Containing Trime-thylbenzoyl-Diphenyl-Phosphine Before and After Aging
Negar Madihi, Maryam Hoorizad ganjkar, Negin Nasoohi, Ali Kaboudanian Ardestani
Journal of Research in Dental and Maxillofacial Sciences.2023; 8(4): 249. CrossRef

225 View
9 Download
3 Web of Science
5 Crossref

Shade reproduction and the ability of lithium disilicate ceramics to mask dark substrates: Maryam Iravani, Sayna Shamszadeh, Narges Panahandeh, Seyedeh Mahsa Sheikh-Al-Eslamian, Hassan Torabzadeh; Restor Dent Endod 2020;45(3):e41. Published online July 16, 2020; DOI: https://doi.org/10.5395/rde.2020.45.e41

Abstract PDF PubReader ePub

Objectives

This study aimed to evaluate the ability of lithium disilicate ceramics to reproduce the A2 shade and to mask A4 substrates.

Materials and Methods

Twenty-four discs (8 mm in diameter, shade A2) of high translucency (groups 1–3) and low translucency (groups 4–6) of IPS e.max ceramic with different thicknesses (0.5, 0.75, and 1 mm) were fabricated as monolithic structures. In addition, discs of medium opacity (group 7–8) with different core/veneer combinations (0.3 mm/0.7 mm and 0.5 mm/0.5 mm) were fabricated as bilayer structures. Specimens were superimposed on an A4 substrate (complex). The color changes of the complex were measured using a spectrophotometer on a black background, and the ΔE values of the complex were compared with either the A4 substrate or the A2 shade tab. One-way analysis of variance, the Tukey honest significant difference test, and the Fisher test were used to analyze the data (p < 0.05).

Results

Significant between-group differences were found for comparisons to both the A4 substrate and the A2 shade (p < 0.05). When compared with the A4 substrate, the ΔE values in all groups were in the non-acceptable range. When compared with the A2 shade, the ΔE values in all groups, except groups 2 and 3, were in the clinically acceptable range.

Conclusions

All translucencies and thicknesses masked the underlying dark substrate. However, the low-translucency IPS e.max Press better reproduced the A2 shade.

Citations

Citations to this article as recorded by

Masking capacity of minimally invasive lithium disilicate restorations on discolored teeth—The impact of ceramic thickness, the material's translucency, and the cement color
Kevser Pala, Eva Maria Reinshagen, Thomas Attin, Jürg Hüsler, Ronald E. Jung, Alexis Ioannidis
Journal of Esthetic and Restorative Dentistry.2024; 36(1): 107. CrossRef
Comparing the color match of monolithic CAD-CAM dental ceramics with the VITA Classical shade guide
Mohammadjavad Shirani, Maryam Emami, Ramin Mosharraf, Omid Savabi, Mehrdad Akhavankhaleghi, Kamran Azadbakht
The Journal of Prosthetic Dentistry.2024; 132(3): 605. CrossRef
Quantitative examination of factors influencing the colour reproduction ability of lithium disilicate glass-ceramics
József Saláta, Ferenc Szabó, Péter Csuti, Melinda Antal, Péter Márton, Péter Hermann, Judit Borbély, Emese Ábrám
BMC Oral Health.2024;[Epub] CrossRef
Aesthetic restoration using liner-treated lithium disilicate laminate veneers in discolored teeth after endodontic treatment : A case report
Ji-Hyun Kim, Min-Soo Bae, Yeon-Hee Park, Jung-Jin Lee, Tae-Sung Bae3, Jae-Min Seo
Korean Journal of Dental Materials.2023; 50(2): 91. CrossRef
Can we use the translucency parameter to predict the CAD/CAM ceramic restoration aesthetic?
Jie Wang, Jiawei Yang, Kaige Lv, Hongming Zhang, Hui Huang, Xinquan Jiang
Dental Materials.2023; 39(3): e1. CrossRef
Final Color of CAD-CAM Produced Thin Lithium Disilicate Ceramics Cemented with Different Colored Resin Cements on Darker Backgrounds
Merve BANKOĞLU GÜNGÖR
ADO Klinik Bilimler Dergisi.2023; 12(2): 234. CrossRef
Masking Ability of Monolithic and Layered Zirconia Crowns on Discolored Substrates
Cristina Gasparik, Manuela Maria Manziuc, Alexandru Victor Burde, Javier Ruiz-López, Smaranda Buduru, Diana Dudea
Materials.2022; 15(6): 2233. CrossRef
Effects of background color and thickness on the optical properties of CAD-CAM resin-matrix ceramics
Afnan F. Alfouzan, Sarah M. Alnafaiy, Lama S. Alsaleh, Noor H. Bawazir, Hanan N. Al-Otaibi, Sara M. Al Taweel, Huda A. Alshehri, Nawaf Labban
The Journal of Prosthetic Dentistry.2022; 128(3): 497.e1. CrossRef
Effect of CAD/CAM Ceramic Thickness on Shade Masking Ability of Discolored Teeth: In Vitro Study
Passent Ellakany, Marwa Madi, Nourhan M. Aly, Zainb S. Al-Aql, Maher AlGhamdi, Abdulrahman AlJeraisy, Adel S. Alagl
International Journal of Environmental Research and Public Health.2021; 18(24): 13359. CrossRef

203 View
2 Download
9 Crossref

Bioactivity of endodontic biomaterials on dental pulp stem cells through dentin: Bahar Javid, Narges Panahandeh, Hassan Torabzadeh, Hamid Nazarian, Ardavan Parhizkar, Saeed Asgary; Restor Dent Endod 2020;45(1):e3. Published online November 4, 2019; DOI: https://doi.org/10.5395/rde.2020.45.e3

Abstract PDF PubReader ePub

Objectives

This study investigated the indirect effect of calcium-enriched mixture (CEM) cement and mineral trioxide aggregate (MTA), as 2 calcium silicate-based hydraulic cements, on human dental pulp stem cells (hDPSCs) through different dentin thicknesses.

Materials and Methods

Two-chamber setups were designed to simulate indirect pulp capping (IPC). Human molars were sectioned to obtain 0.1-, 0.3-, and 0.5-mm-thick dentin discs, which were placed between the 2 chambers to simulate an IPC procedure. Then, MTA and CEM were applied on one side of the discs, while hDPSCs were cultured on the other side. After 2 weeks of incubation, the cells were removed, and cell proliferation, morphology, and attachment to the discs were evaluated under scanning electron microscopy (SEM). Energy-dispersive X-ray (EDXA) spectroscopy was performed for elemental analysis. Alkaline phosphatase (ALP) activity was assessed quantitatively. The data were analyzed using the Kruskal-Wallis and Mann-Whitney tests.

Results

SEM micrographs revealed elongated cells, collagen fibers, and calcified nucleations in all samples. EDXA verified that the calcified nucleations consisted of calcium phosphate. The largest calcifications were seen in the 0.1-mm-thick dentin subgroups. There was no significant difference in ALP activity across the CEM subgroups; however, ALP activity was significantly lower in the 0.1-mm-thick dentin subgroup than in the other MTA subgroups (p < 0.05).

Conclusions

The employed capping biomaterials exerted biological activity on hDPSCs, as shown by cell proliferation, morphology, and attachment and calcific precipitations, through 0.1- to 0.5-mm-thick layers of dentin. In IPC, the bioactivity of these endodontic biomaterials is probably beneficial.

Citations

Citations to this article as recorded by

Effect of pulp capping materials on odontogenic differentiation of human dental pulp stem cells: An in vitro study
Mahmoud M. Bakr, Mohamed Shamel, Shereen N. Raafat, Robert M. Love, Mahmoud M. Al‐Ankily
Clinical and Experimental Dental Research.2024;[Epub] CrossRef
Effects of Growth Factors on the Differentiation of Dental Stem Cells: A Systematic Review and Meta-analysis (Part I)
Sayna Shamszadeh, Armin Shirvani, Hassan Torabzadeh, Saeed Asgary
Current Stem Cell Research & Therapy.2024; 19(4): 523. CrossRef
The Role of Growth Factor Delivery Systems on Cellular Activities of Dental Stem Cells: A Systematic Review (Part II)
Sayna Shamszadeh, Armin Shirvani, Saeed Asgary
Current Stem Cell Research & Therapy.2024; 19(4): 587. CrossRef
Comprehensive review of composition, properties, clinical applications, and future perspectives of calcium-enriched mixture (CEM) cement: a systematic analysis
Saeed Asgary, Mahtab Aram, Mahta Fazlyab
BioMedical Engineering OnLine.2024;[Epub] CrossRef
Evaluation of dental pulp stem cells behavior after odontogenic differentiation induction by three different bioactive materials on two different scaffolds
Basma Ahmed, Mai H. Ragab, Rania A. Galhom, Hayam Y. Hassan
BMC Oral Health.2023;[Epub] CrossRef
Characterization of Dental Pulp Stem Cell Responses to Functional Biomaterials Including Mineralized Trioxide Aggregates
Sejin Bae, Bueonguk Kang, Hyungbin Lee, Harrison Luu, Eric Mullins, Karl Kingsley
Journal of Functional Biomaterials.2021; 12(1): 15. CrossRef
Incorporation of amoxicillin-loaded microspheres in mineral trioxide aggregate cement: an in vitro study
Fábio Rocha Bohns, Vicente Castelo Branco Leitune, Isadora Martini Garcia, Bruna Genari, Nélio Bairros Dornelles, Silvia Stanisçuaski Guterres, Fabrício Aulo Ogliari, Mary Anne Sampaio de Melo, Fabrício Mezzomo Collares
Restorative Dentistry & Endodontics.2020;[Epub] CrossRef

208 View
6 Download
7 Crossref

Effect of water storage on flexural strength of silorane and methacrylate-based composite resins: Narges Panahandeh, Hassan Torabzadeh, Hani Naderi, Seyedeh Mahsa Sheikh-Al-Eslamian; Restor Dent Endod 2017;42(4):309-315. Published online November 6, 2017; DOI: https://doi.org/10.5395/rde.2017.42.4.309

Abstract PDF PubReader ePub

Objectives

This study assessed the effect of water storage on the flexural strength (FS) of low shrinkage composites.

Materials and Methods

A total of 165 bar-shaped specimens (2 × 2 × 25 mm) were fabricated of 2 low shrinkage composites (Filtek P90 [3M ESPE], GC Kalore [GC International]) and a conventional methacrylate-based composite (Filtek Z250 [3M ESPE]). The specimens were subjected to 3-point bending test at 6 time intervals, namely: immediately after curing, at 24 hours, 1 week, 1 month, 6 months, and 1 year following storage in wet and dry conditions. The FS of the specimens were measured by applying compressive load at a crosshead speed of 1.0 mm/min. Data was analyzed using 3-way analysis of variance (ANOVA) and Tukey's test.

Results

Three-way ANOVA revealed significant interactions between time, type of composite, and storage condition (p = 0.001). Tukey's multiple comparison test revealed significant reductions in FS of all composites after 6 months and 1 year of storage in distilled water compared to dry condition.

Conclusions

Filtek P90 showed the highest and GC Kalore showed the lowest FS after 1 year storage in distilled water. The immediate high strength of Filtek Z250 significantly decreased at 1 year and its final value was lower than that of Filtek P90.

Citations

Citations to this article as recorded by

Effects of Bio-Aging on Mechanical Properties and Microbial Behavior of Different Resin Composites
Yuke Shou, Lanzhi Deng, Xiaoyu Huang, Xinyu Peng, Xinxuan Zhou, Zheng Wang, Yannan Huang, Bina Yang, Haohao Wang, Min Zhang, Lei Cheng
Biomolecules.2023; 13(7): 1125. CrossRef
Changes in color and contrast ratio of resin composites after curing and storage in water
Marlus da Silva Pedrosa, Fernando Neves Nogueira, Vitor de Oliveira Baldo, Igor Studart Medeiros
The Saudi Dental Journal.2021; 33(8): 1160. CrossRef
Ageing of Dental Composites Based on Methacrylate Resins—A Critical Review of the Causes and Method of Assessment
Agata Szczesio-Wlodarczyk, Jerzy Sokolowski, Joanna Kleczewska, Kinga Bociong
Polymers.2020; 12(4): 882. CrossRef
Color stability of nanohybrid composite resins in drinks
Juliana Jendiroba Faraoni, Isabela Barbosa Quero, Lívia Semedo Schiavuzzo, Regina Guenka Palma-Dibb
Brazilian Journal of Oral Sciences.2019; 18: e191601. CrossRef
Mechanical Degradation of Different Classes of Composite Resins Aged in Water, Air, and Oil
Weber Adad Ricci, Priscila Alfano, Saulo Pamato, Carlos Alberto dos Santos Cruz, Jefferson Ricardo Pereira
BioMed Research International.2019; 2019: 1. CrossRef
Effects of water and microbial-based aging on the performance of three dental restorative materials
Xinxuan Zhou, Suping Wang, Xian Peng, Yao Hu, Biao Ren, Mingyun Li, Liying Hao, Mingye Feng, Lei Cheng, Xuedong Zhou
Journal of the Mechanical Behavior of Biomedical Materials.2018; 80: 42. CrossRef

217 View
2 Download
6 Crossref

Author index