Restorative Dentistry & Endodontics

Research 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

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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

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Physicochemical characterization of two bulk fill composites at different depths: Guillermo Grazioli, Carlos Enrique Cuevas-Suárez, Leina Nakanishi, Alejandro Francia, Rafael Ratto de Moraes; Restor Dent Endod 2021;46(3):e39. Published online July 5, 2021; DOI: https://doi.org/10.5395/rde.2021.46.e39

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Objectives

This study analyzed the physical-chemical behavior of 2 bulk fill resin composites (BFCs; Filtek Bulk Fill [FBF], and Tetric-N-Ceram Bulk Fill [TBF]) used in 2- and 4-mm increments and compared them with a conventional resin composite (Filtek Z250).

Materials and Methods

Flexural strength and elastic modulus were evaluated by using a 3-point bending test. Knoop hardness was measured at depth areas 0–1, 1–2, 2–3, and 3–4 mm. The translucency parameter was measured using an optical spectrophotometer. Real-time polymerization kinetics was analyzed using Fourier transform infrared spectroscopy.

Results

Flexural strength was similar among the materials, while TBF showed lower elastic modulus (Z250: 6.6 ± 1.3, FBF: 6.4 ± 0.9, TBF: 4.3 ± 1.3). The hardness of Z250 was similar only between 0–1 mm and 1–2 mm. Both BFCs had similar hardness until 2–3 mm, and showed significant decreases at 3–4 mm (FBF: 33.45 ± 1.95 at 0–1 mm to 23.19 ± 4.32 at 3–4 mm, TBF: 23.17 ± 2.51 at 0–1 mm to 15.11 ± 1.94 at 3–4 mm). The BFCs showed higher translucency than Z250. The polymerization kinetics of all the materials were similar at 2-mm increments. At 4-mm, only TBF had a similar degree of conversion compared with 2 mm.

Conclusions

The BFCs tested had similar performance compared to the conventional composite when used in up to 2-mm increments. When the increment was thicker, the BFCs were properly polymerized only up to 3 mm.

Citations

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Translucency of bulk‐fill composite materials: A systematic review
Gaetano Paolone, Sofia Baldani, Niccolò De Masi, Mauro Mandurino, Giacomo Collivasone, Nicola Scotti, Enrico Gherlone, Giuseppe Cantatore
Journal of Esthetic and Restorative Dentistry.2024; 36(7): 995. CrossRef
Can composite packaging and selective enamel etching affect the clinical behavior of bulk-fill composite resin in posterior restorations? 24-month results of a randomized clinical trial
Marcos de Oliveira BARCELEIRO, Chane TARDEM, Elisa Gomes ALBUQUERQUE, Leticia de Souza LOPES, Stella Soares MARINS, Luiz Augusto POUBEL, Roberta BARCELOS, Romina ÑAUPARI-VILLASANTE, Alessandro Dourado LOGUERCIO, Fernanda Signorelli CALAZANS
Journal of Applied Oral Science.2023;[Epub] CrossRef
No-Cap Flowable Bulk-Fill Composite: Physico-Mechanical Assessment
Abdullah Alshehri, Feras Alhalabi, Ali Robaian, Mohammed A. S. Abuelqomsan, Abdulrahman Alshabib, Eman Ismail, Faisal Alzamil, Nawaf Alotaibi, Hamad Algamaiah
Polymers.2023; 15(8): 1847. CrossRef
The Microhardness and Surface Roughness Assessment of Bulk-Fill Resin Composites Treated with and without the Application of an Oxygen-Inhibited Layer and a Polishing System: An In Vitro Study
Ann Carrillo-Marcos, Giuliany Salazar-Correa, Leonor Castro-Ramirez, Marysela Ladera-Castañeda, Carlos López-Gurreonero, Hernán Cachay-Criado, Ana Aliaga-Mariñas, Alberto Cornejo-Pinto, Luis Cervantes-Ganoza, César Félix Cayo-Rojas
Polymers.2022; 14(15): 3053. CrossRef

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Influence of 10-MDP concentration on the adhesion and physical properties of self-adhesive resin cements: Kazuhiko Shibuya, Naoko Ohara, Serina Ono, Kumiko Matsuzaki, Masahiro Yoshiyama; Restor Dent Endod 2019;44(4):e45. Published online November 12, 2019; DOI: https://doi.org/10.5395/rde.2019.44.e45

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Objectives

Self-adhesive resin cements contain functional monomers that enable them to adhere to the tooth structure without a separate adhesive or etchant. One of the most stable functional monomers used for chemical bonding to calcium in hydroxyapatite is 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP). The aim of this study was to evaluate the influence of the10-MDP concentration on the bond strength and physical properties of self-adhesive resin cements.

Materials and Methods

We used experimental resin cements containing 3 different concentrations of 10-MDP: 3.3 wt% (RC1), 6.6 wt% (RC2), or 9.9 wt% (RC3). The micro-tensile bond strength of each resin cement to dentin and a hybrid resin block (Estenia C&B, Kuraray Noritake Dental) was measured, and the fractured surface morphology was analyzed. Further, the flexural strength of the resin cements was measured using the three-point bending test. The water sorption and solubility of the cements following 30 days of immersion in water were measured.

Results

The bond strength of RC2 was significantly higher than that of RC1. There was no significant difference between the bond strength of RC2 and that of RC3. The water sorption of RC3 was higher than that of any other cement. There were no significant differences in the three-point bending strength or water solubility among all three types of cements.

Conclusions

Within the limitations of this study, it is suggested that 6.6 wt% 10-MDP showed superior properties than 3.3 wt% or 9.9 wt% 10-MDP in self-adhesive resin cement.

Citations

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A thorough assessment of 10-MDP primers in modern dental adhesive systems
Ahmed A Abduljawad, Harraa SM Salih, Omar F Tawfiq
Journal of Baghdad College of Dentistry.2024; 36(3): 79. CrossRef
Material properties and finite element analysis of adhesive cements used for zirconia crowns on dental implants
Megha Satpathy, Hai Pham, Shreya Shah
Computer Methods in Biomechanics and Biomedical Engineering.2024; : 1. CrossRef
Clinical reliability of self-adhesive luting resins compared to other adhesive procedures: A systematic review and meta-analysis
Mohammed Ahmed Alghauli, Ahmed Yaseen Alqutaibi, Sebastian Wille, Matthias Kern
Journal of Dentistry.2023; 129: 104394. CrossRef
Influence of autoclave sterilization on bond strength between zirconia frameworks and Ti-base abutments using different resin cements
Reinhold Lang, Karl-Anton Hiller, Lena Kienböck, Katrin Friedl, Karl-Heinz Friedl
The Journal of Prosthetic Dentistry.2022; 127(4): 617.e1. CrossRef
Varying 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP) level improves polymerisation kinetics and flexural strength in self-adhesive, remineralising composites
António H.S. Delgado, Nazanin Owji, Paul Ashley, Anne M. Young
Dental Materials.2021; 37(9): 1366. CrossRef
Investigating a Commercial Functional Adhesive with 12-MDPB and Reactive Filler to Strengthen the Adhesive Interface in Eroded Dentin
Madalena Belmar da Costa, António HS Delgado, Tomás Amorim Afonso, Luís Proença, Ana Sofia Ramos, Ana Mano Azul
Polymers.2021; 13(20): 3562. CrossRef

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The effect of thermocycling on the degree of conversion and mechanical properties of a microhybrid dental resin composite: Mehrsima Ghavami-Lahiji, Melika Firouzmanesh, Hossein Bagheri, Tahereh S. Jafarzadeh Kashi, Fateme Razazpour, Marjan Behroozibakhsh; Restor Dent Endod 2018;43(2):e26. Published online April 26, 2018; DOI: https://doi.org/10.5395/rde.2018.43.e26

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Objective

The purpose of this study was to investigate the degree of conversion (DC) and mechanical properties of a microhybrid Filtek Z250 (3M ESPE) resin composite after aging.

Method

The specimens were fabricated using circular molds to investigate Vickers microhardness (Vickers hardness number [VHN]) and DC, and were prepared according to ISO 4049 for flexural strength testing. The initial DC (%) of discs was recorded using attenuated total reflectance-Fourier transforming infrared spectroscopy. The initial VHN of the specimens was measured using a microhardness tester under a load of 300 g for 15 seconds and the flexural strength test was carried out with a universal testing machine (crosshead speed, 0.5 mm/min). The specimens were then subjected to thermocycling in 5°C and 55°C water baths. Properties were assessed after 1,000–10,000 cycles of thermocycling. The surfaces were evaluated using scanning electron microscopy (SEM). Data were analyzed using 1-way analysis of variance followed by the Tukey honest significant difference post hoc test.

Results

Statistical analysis showed that DC tended to increase up to 4,000 cycles, with no significant changes. VHN and flexural strength values significantly decreased upon thermal cycling when compared to baseline (p < 0.05). However, there was no significant difference between initial and post-thermocycling VHN results at 1,000 cycles. SEM images after aging showed deteriorative changes in the resin composite surfaces.

Conclusions

The Z250 microhybrid resin composite showed reduced surface microhardness and flexural strength and increased DC after thermocycling.

Citations

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Girija S Sajjan, Naveena Ponnada, Praveen Dalavai, Madhu Varma Kanumuri, Venkata Karteek Varma Penmatsa, B V Sindhuja
World Journal of Dentistry.2025; 15(9): 749. CrossRef
Different contemporary resin cements for intracanal luting of glass fiber posts - Bonding and polymerization assessments
Anna Caroliny Detogni, Vitaliano Gomes de Araújo Neto, Caio Felipe de Almeida Nobre, Victor Pinheiro Feitosa, Mário Alexandre Coelho Sinhoreti
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Muhammet Fidan, Nevin Çankaya
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Nuttanun Poeaim, Sirawut Hiran-us, Yanee Tantilertanant
The Journal of Prosthetic Dentistry.2025;[Epub] CrossRef
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João Paulo Mendes Tribst, Adelheid Veerman, Gabriel Kalil Rocha Pereira, Cornelis Johannes Kleverlaan, Amanda Maria de Oliveira Dal Piva
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Verónica Lucía Ventrera, María Eugenia Alejandra Barrionuevo
Revista de la Asociación Odontológica Argentina.2024; : 1. CrossRef
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Hyeong-Ju YU, You-Jung KANG, Yeseul PARK, Hoon KIM, Jee-Hwan KIM
Dental Materials Journal.2024; 43(6): 813. CrossRef
Effect of aging and fiber‐reinforcement on color stability, translucency, and microhardness of single‐shade resin composites versus multi‐shade resin composite
Muhammet Fidan, Özhan Yağci
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Ahmed Altarazi, Julfikar Haider, Abdulaziz Alhotan, Nick Silikas, Hugh Devlin, Weihao Yuan
International Journal of Biomaterials.2024;[Epub] CrossRef
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Clinical Decision‐Making of Repair vs. Replacement of Defective Direct Dental Restorations: A Multinational Cross‐Sectional Study With Meta‐Analysis
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Zerin Yeşil Acar, Merve Tunç Koçyiğit, Meltem Asiltürk
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Nantawan Krajangta, Supissara Ninbanjong, Sunisa Khosook, Kanjana Chaitontuak, Awiruth Klaisiri
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Meghna Dugar, Anuja Ikhar, Pradnya Nikhade, Manoj Chandak, Nidhi Motwani
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The First Step in Standardizing an Artificial Aging Protocol for Dental Composites—Evaluation of Basic Protocols
Agata Szczesio-Wlodarczyk, Magdalena Fronczek, Katarzyna Ranoszek-Soliwoda, Jarosław Grobelny, Jerzy Sokolowski, Kinga Bociong
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Effect of Different Surface Treatments on the Long‐Term Repair Bond Strength of Aged Methacrylate‐Based Resin Composite Restorations: A Systematic Review and Network Meta‐analysis
Mahdi Hadilou, Amirmohammad Dolatabadi, Morteza Ghojazadeh, Hossein Hosseinifard, Parnian Alizadeh Oskuee, Fatemeh Pournaghi Azar, Victor Feitosa
BioMed Research International.2022;[Epub] CrossRef
Edge chipping resistance of veneering composite resins
Parissa Nassary Zadeh, Bogna Stawarczyk, Rüdiger Hampe, Anja Liebermann, Felicitas Mayinger
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The effect of radiation exposure and storage time on the degree of conversion and flexural strength of different resin composites
Ragia M. Taher, Lamiaa M. Moharam, Amin E. Amin, Mohamed H. Zaazou, Farid S. El-Askary, Mokhtar N. Ibrahim
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Fracture Load of CAD/CAM Fabricated Cantilever Implant-Supported Zirconia Framework: An In Vitro Study
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A numerical, theoretical and experimental study of the effect of thermocycling on the matrix-filler interface of dental restorative materials
Yoan Boussès, Nathalie Brulat-Bouchard, Pierre-Olivier Bouchard, Yannick Tillier
Dental Materials.2021; 37(5): 772. CrossRef
Impact of polymerization and storage on the degree of conversion and mechanical properties of veneering resin composites
Felicitas MAYINGER, Marcel REYMUS, Anja LIEBERMANN, Marc RICHTER, Patrick KUBRYK, Henning GROẞEKAPPENBERG, Bogna STAWARCZYK
Dental Materials Journal.2021; 40(2): 487. CrossRef
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DP Silva, BA Resende, M Kury, CB André, CPM Tabchoury, M Giannini, V Cavalli
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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

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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
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Marlus da Silva Pedrosa, Fernando Neves Nogueira, Vitor de Oliveira Baldo, Igor Studart Medeiros
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Agata Szczesio-Wlodarczyk, Jerzy Sokolowski, Joanna Kleczewska, Kinga Bociong
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Juliana Jendiroba Faraoni, Isabela Barbosa Quero, Lívia Semedo Schiavuzzo, Regina Guenka Palma-Dibb
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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

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Flexural strength and microstructure of two lithium disilicate glass ceramics for CAD/CAM restoration in the dental clinic: Suk-Ho Kang, Juhea Chang, Ho-Hyun Son; Restor Dent Endod 2013;38(3):134-140. Published online August 23, 2013; DOI: https://doi.org/10.5395/rde.2013.38.3.134

Abstract PDF PubReader ePub

Objectives

There has been a growing interest in glass ceramic systems with good esthetics, high fracture resistance and bonding durability, and simplified fabrication techniques using CAD/CAM. The aim of this study is to compare flexural strength before and after heat treatment of two lithium disilicate CAD/CAM blocks, IPS e.max CAD (Ivoclar Vivadent) and Rosetta SM (Hass), and to observe their crystalline structures.

Materials and Methods

Biaxial flexural strength was tested according to ISO 6872 with 20 disc form specimens sliced from each block before and after heat treatment. Also, the crystalline structures were observed using field-emission scanning microscopy (FE-SEM, Hitachi) and x-ray diffraction (XRD, Rigaku) analysis. The mean values of the biaxial flexural strength were analyzed by the Mann-Whitney U test at a significance level of p = 0.05.

Results

There were no statistically significant differences in flexural strength between IPS e.max CAD and Rosetta SM either before heat treatment or after heat treatment. For both ceramics, the initial flexural strength greatly increased after heat treatment, with significant differences (p < 0.05). The FE-SEM images presented similar patterns of crystalline structure in the two ceramics. In the XRD analysis, they also had similar patterns, presenting high peak positions corresponding to the standard lithium metasilicate and lithium disilicate at each stage of heat treatment.

Conclusions

IPS e.max CAD and Rosetta SM showed no significant differences in flexural strength. They had a similar crystalline pattern and molecular composition.

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Inhibitory effect on Streptococcus mutans and mechanical properties of the chitosan containing composite resin: Ji-Sun Kim, Dong-Hoon Shin; Restor Dent Endod 2013;38(1):36-42. Published online February 26, 2013; DOI: https://doi.org/10.5395/rde.2013.38.1.36

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Objectives

This study evaluated the antibacterial effect and mechanical properties of composite resins (L_CR, M_CR, H_CR) incorporating chitosan with three different molecular weights (L, Low; M, Medium; H, High).

Materials and Methods

Streptococcus (S). mutans 100 mL and each chitosan powder were inoculated in sterilized 10 mL Brain-Heart Infusion (BHI) solution, and was centrifuged for 12 hr. Absorbance of the supernatent was measured at OD₆₆₀ to estimate the antibacterial activities of chitosan. After S. mutans was inoculated in the disc shaped chitosan-containing composite resins, the disc was cleansed with BHI and diluted with serial dilution method. S. mutans was spread on Mitis-salivarius bacitracin agar. After then, colony forming unit (CFU) was measured to verify the inhibitory effect on S. mutans biofilm. To ascertain the effect on the mechanical properties of composite resin, 3-point bending and Vickers hardness tests were done after 1 and 3 wk water storage, respectively. Using 2-way analysis of variance (ANOVA) and Scheffe test, statistical analysis was done with 95% significance level.

Results

All chitosan powder showed inhibition effect against S. mutans. CFU number in chitosan-containing composite resins was smaller than that of control resin without chitosan. The chitosan containing composite resins did not show any significant difference in flexural strength and Vickers hardness in comparison with the control resin. However, the composite resin, M_CR showed a slightly decreased flexural strength and the maximum load than those of control and the other composite resins H_CR and L_CR.

Conclusions

L_CR and H_CR would be recommended as a feasible antibacterial restorative due to its antibacterial nature and mechanical properties.

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Basic Research

Effects of the color components of light-cured composite resin before and after polymerization on degree of conversion and flexural strength: Ji-A Yoo, Byeong-Hoon Cho; J Korean Acad Conserv Dent 2011;36(4):324-335. Published online July 31, 2011; DOI: https://doi.org/10.5395/JKACD.2011.36.4.324

Abstract PDF PubReader ePub

Objectives

This study investigated the effects of the color components of light-cured composite resin before and after polymerization on degree of conversion (DC) and biaxial flexural strength (FS).

Materials and Methods

Four enamel shades (A1, A2, A3, A4) and two dentin shades (A2O, A3O) of Premisa (Kerr Co.) and Denfil (Vericom Co.) were evaluated on their CIE L^*, a^*, b^* color components using the spectrophotometer before curing, after curing and at 7 day. The DC of same specimens were measured with Near-infrared spectrometer (Nexus, Thermo Nicolet Co.) at 2 hr after cure and at 7 day. Finally, the FS was obtained after all the other measurements were completed at 7 day. The correlations between each color component and DC and FS were evaluated.

Results

The light-curing of composite resin resulted in color changes of Premisa in red-blue direction and Denfil in green-blue direction. The DC and FS were affected by product, time and shade (3-way ANOVA, p < 0.05) and product and shade (2-way ANOVA, p < 0.05), respectively. Premisa only showed a significant correlation between the DC and CIE a^* component - before and after polymerization (Pearson product moment correlation, p < 0.05). The FS of Premisa showed significant negative correlations with CIE a^* and CIE b^* components.

Conclusions

The DC and FS of the light-curing composite resin were affected by the color components of the material before and after polymerization.

Citations

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Evaluation of Color Stability according to Shade of Temporary Crown Resin Using Digital Spectrophotometer: In Vitro Study
Hye-min Ku, Mi-Kyoung Jun
Journal of Dental Hygiene Science.2022; 22(3): 139. CrossRef
The properties of UDMA dental composite resin with novel photosensitizers
Gum Ju Sun
Journal of Korean Acedemy of Dental Technology.2013; 35(3): 209. CrossRef

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Original Articles

The effect of environment on the physical properties of core materials: Yoo-Sook Hwang, Kyoung-Kyu Choi, Sang-Jin Park; J Korean Acad Conserv Dent 2005;30(2):86-94. Published online March 31, 2005; DOI: https://doi.org/10.5395/JKACD.2005.30.2.086

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The purpose of this study was to measure the flexural strength and hardness of four core materials in 4 different medias and to evaluate the relationship between the physical properties.

For the flexural strength, the specimens were prepared from each of the following materials: Bisfil Core, Core Max, Fuji IX GP, Miracle Mix and randomly divided into four groups and stored at 37 degree C in the following medias: distilled water for 24 hours (DW/1), distilled water for 30 days (DW/30). 2% NaF for 30 days (NF/30), 0.02N lactic acid for 30 days (LA/30). After storage, the specimens were subjected to flexural strength testing and calculated to flexural modulus.

For hardness testing, specimens were prepared from four materials and storaged in the uniform way. After storage, the specimens were subjected to Vicker's hardness testing.

1. The flexural strength of Core Max were the highest, and the flexural strength of Miracle Mix were the lowest.

2. The hardness of Bisfil Core were the highest.

3. The hardness of Core Max were the highest.

4. The hardness of Miracle Mix were the lowest.

5. 2% NaF and 0.02N lactic acid negatively affected the flexural strength and hardness of four core materials.

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A study on the material properties of various composite resins for core build-up: Soo-Il Shin, Dong-Hoon Shin; J Korean Acad Conserv Dent 2004;29(2):191-199. Published online March 31, 2004; DOI: https://doi.org/10.5395/JKACD.2004.29.2.191

Abstract PDF PubReader ePub

The purposes of this study were to estimate the material properties of the recently developed domestic composite resins for core filling material (Chemical, Dual A, Dual B; Vericom, Korea) and to compare them with other marketed foreign products (CorePaste, Den-Mat, USA; Ti-Core, Essential Dental Systems, USA; Support, SCI-Pharm, USA). Six assessments were made; working time, setting time, depth of polymerization, flexural strength, bonding strength, and marginal leakage. All items were compared to ISO standards.

All domestic products satisfied the minimum requirements from ISO standards (working time: above 90 seconds, setting time: within 5 minutes), and showed significantly higher flexural strength than Core Paste. Dual A and B could, especially, reduce the setting time to 60 seconds when cured with 600 mW/cm² light intensity. All experimental materials showed 6 mm depth of polymerization.

Bond strengths of Ti-Core and Dual B materials were significantly higher than the other materials. Furthermore, three domestic products and Ti-Core could reduce the microleakage effectively.

Citations

Citations to this article as recorded by

Effect of surface treatments of fiber posts on bond strength to composite resin cores
Hye-Jo Keum, Hyun-Mi Yoo
Journal of Korean Academy of Conservative Dentistry.2010; 35(3): 173. CrossRef

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