scholarly journals Comparative Analysis of Static and Viscoelastic Mechanical Behavior of Different Luting Material Categories after Aging

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1452
Author(s):  
Nicoleta Ilie
Keyword(s):  
Comparative Analysis ◽  
Mechanical Behavior ◽  
Glass Ionomer Cement ◽  
Bending Test ◽  
Glass Ionomer ◽  
Aging Behavior ◽  
Depth Sensing ◽  
Dynamic Mechanical ◽  
Luting Material ◽  
Ionomer Cement

The longevity of indirect restorations is primarily determined by the appropriate selection of the luting material. The function of a luting material is to seal the restoration and hold it in place for the time required for service. The mechanical behavior of luting materials and in particular their aging behavior, therefore, play a decisive role. The study provides a comparative analysis of the static and dynamic mechanical behavior of the most commonly used luting material categories—zinc phosphate cement, glass–ionomer cement, resin-modified glass–ionomer cement, resin-based composites, and self-adhesive resin-based composites—and their aging behavior. It also takes into account that luting materials are viscoelastic materials, i.e., materials that respond to external loading in a way that lies between an elastic solid and a viscous liquid. Flexural strength and modulus were determined in a three-point bending test followed by fractography analysis. The quasi-static and viscoelastic behavior was analyzed by a depth-sensing indentation test provided with a dynamic mechanical analysis (DMA) module at 20 different frequencies (1–50 Hz). The fracture toughness was evaluated in a notchless triangular prism (NTP) test. Material type exhibits the strongest influence on all measured properties, while the effect of aging becomes more evident in the material reliability. The variation of the viscoelastic parameters with aging reflects cement maturation or polymer plasticization.

scholarly journals Flexural Strength of Glass Carbomer Cement and Conventional Glass Ionomer Cement Stored in Different Storage Media over Time

2018 ◽  
Vol 27 (4) ◽  
pp. 372-377 ◽  
Author(s):  
Muhammad Ali Faridi ◽  
Abdul Khabeer ◽  
Saad Haroon
Keyword(s):  
Flexural Strength ◽  
Artificial Saliva ◽  
Glass Ionomer Cement ◽  
Bending Test ◽  
Glass Ionomer ◽  
Time Intervals ◽  
Storage Media ◽  
Unique Factor ◽  
Post Hoc ◽  
Ionomer Cement

Objectives: Glass ionomer cement (GIC) is routinely placed as a restorative material in dentistry. However, due to its poor physical properties, its use is limited to cases where the level of stress on restoration is minimal. Improved formulations of GIC have been developed to overcome these drawbacks. The purpose of this study was to evaluate flexural strength of a conventional GIC (Fuji IX) against a newly developed glass carbomer cement (GCP). Materials and Methods: For Fuji IX and GCP, a total of 80 blocks were prepared and divided into 16 groups (n = 5). These groups were further categorized according to the storage medium (artificial saliva and Vaseline) and time intervals (24 h and 1, 2, and 4 weeks). A 3-point bending test was carried out, and statistical analysis was done using ANOVA and Tukey post hoc tests. Results: Fuji IX showed a mean flexural strength of 25.14 ± 13.02 versus 24.27 ± 12.57 MPa for GCP. There was no significant statistical difference between both materials when compared under storage media. Both materials showed the highest value for flexural strength at 2 weeks of storage and lowest at 4 weeks. Conclusion: The storage media do not affect the flexural strength of the specimens with reference to time. Time is the unique factor with relative influence on mean resistance to fracture. Further testing is required to evaluate the true potential of the newly developed GCP.

scholarly journals Comparative Evaluation of Flexural Strength of Glass Ionomer Cement and Cention N in Artificial Medium Over Time Intervals - An In-Vitro Study

2021 ◽  
Vol 10 (32) ◽  
pp. 2609-2614
Author(s):  
Risana K. ◽  
Prathyusha P ◽  
Amith Adyanthaya ◽  
Aparna Sivaraman ◽  
Nazreen Ayub K ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Artificial Saliva ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Bending Test ◽  
Glass Ionomer ◽  
Time Intervals ◽  
Significant Difference ◽  
Duration Of Storage ◽  
Ionomer Cement

BACKGROUND Glass ionomer cement (GIC) is a versatile restorative cement in paediatric dentistry. Due to its less flexural strength, alternative materials have been developed. Cention N is one such material, but since it’s a new material evidence is lacking regarding its physical properties, especially flexural strength for evaluating its clinical outcome. We wanted to compare the flexural strength of glass ionomer cement and Cention N stored in artificial saliva and its variation over different time intervals, i.e., after 24 hours, 1 week and 4 weeks. METHODS A total of 30 specimens were prepared for GIC (Fuji IX) and Cention N and were further categorized according to the duration of storage time of 24 hours, 1 week and 4 weeks (N = 10). A 3 - point bending test using a universal testing machine was used to evaluate the flexural strength. RESULTS GIC Fuji IX showed a mean flexural strength of 35.296 ± 1.61 Mpa at the end of 24 hours, 47.234 ± 4.12 after 1 week and 66.039 ± 11.05 Mpa at the end of 4 weeks. GIC showed a statistically significant increase of flexural strength from 24 hours to one week and a further increase after 4 weeks of storage. The flexural strength of Cention N at 24 hours was 175.985 ± 22.11 Mpa, at the end of one week was 163.486 ± 17.55 MPa, and after 4 weeks was 175.437 ± 27.22 Mpa. Cention N did not show any statistically significant change in flexural strength value from 24 hours to 4 weeks. Cention N showed highly significant difference between flexural strength compared to GIC at all - time intervals. CONCLUSIONS Cention N has a superior flexural strength compared to GIC at all - time intervals. KEY WORDS Cention N, Flexural Strength, Glass Ionomer Cement

Microleakage of class II restoration with zirconia inlay: An in vitro study

2019 ◽  
pp. 61-67
Author(s):  
Xuan Anh Ngoc Ho ◽  
Anh Chi Phan ◽  
Toai Nguyen
Keyword(s):  
Glass Ionomer Cement ◽  
Class Ii ◽  
Resin Cement ◽  
Glass Ionomer ◽  
Resin Modified Glass Ionomer ◽  
Group 2 ◽  
Self Etch ◽  
Ionomer Cement ◽  
Group 1 ◽  
Composite Restoration

Background: Class II restoration with zirconia inlay is concerned by numerous studies about the luting coupling between zirconia inlay and teeth. The present study was performed to evaluate the microleakage of Class II zirconia inlayusing two different luting agents and compare to direct restoration using bulk fill composite. Aims: To evaluate the microleakage of Class II restorations using three different techniques. Materials and methods: The study was performed in laboratory with three groups. Each of thirty extracted human teeth was prepared a class II cavity with the same dimensions, then these teeth were randomly divided into 3 groups restored by 3 different approaches. Group 1: zirconia inlay cemented with self-etch resin cement (Multilink N); Group 2: zirconia inlay cemented with resin-modified glass ionomer cement (Fuji Plus); Group 3: direct composite restoration using bulk fill composite(Tetric N-Ceram Bulk Fill). All restorations were subjected to thermal cycling (100 cycles 50C – 55 0C), then immersed to 2% methylene blue solution for 24 hours. The microleakage determined by the extent of dye penetration along the gingival wall was assessed using two methods: quantitative and semi-quantitative method. Results: Among three types of restorations, group 1 demonstrated the significantly lower rate of leakage compared to the others, while group 2 and 3 showed no significant difference. Conclusion: Zirconia inlay restoration cemented with self-etch resin cement has least microleakage degree when compare to class II zirconia inlay restoration cemented with resin-modified glass ionomer cement and direct composite restoration using bulk fill composite. Key words: inlay, zirconia ceramic, class II restoration, microleakage.

Comparative Evaluation of Mechanical Properties of Ceramic Reinforced Glass Ionomer Cement and Type IX GIC:An Invitro Study

2019 ◽  
Vol 10 (12) ◽  
pp. 35
Author(s):  
Nagalakshmi Chowdhary ◽  
N. K. Kiran ◽  
A. Lakshmi Priya ◽  
Rajashekar Reddy ◽  
Arvind Sridhara ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Comparative Evaluation ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Ionomer Cement

scholarly journals Effects of ionizing radiation on surface properties of current restorative dental materials

2021 ◽  
Vol 32 (6) ◽  
Author(s):  
Débora Michelle Gonçalves de Amorim ◽  
Aretha Heitor Veríssimo ◽  
Anne Kaline Claudino Ribeiro ◽  
Rodrigo Othávio de Assunção e Souza ◽  
Isauremi Vieira de Assunção ◽  
...  
Keyword(s):  
Ionizing Radiation ◽  
Surface Properties ◽  
Resin Composite ◽  
Dental Materials ◽  
Glass Ionomer Cement ◽  
Contact Angles ◽  
Glass Ionomer ◽  
Post Radiation ◽  
Restorative Dental Materials ◽  
Ionomer Cement

AbstractTo investigate the impact of radiotherapy on surface properties of restorative dental materials. A conventional resin composite—CRC (Aura Enamel), a bulk-fill resin composite—BFRC (Aura Bulk-fill), a conventional glass ionomer cement—CGIC (Riva self cure), and a resin-modified glass ionomer cement—RMGIC (Riva light cure) were tested. Forty disc-shaped samples from each material (8 mm diameter × 2 mm thickness) (n = 10) were produced according to manufacturer directions and then stored in water distilled for 24 h. Surface wettability (water contact angle), Vickers microhardness, and micromorphology through scanning electron microscopy (SEM) before and after exposition to ionizing radiation (60 Gy) were obtained. The data were statistically evaluated using the two-way ANOVA and Tukey posthoc test (p < 0.05). Baseline and post-radiation values of contact angles were statistically similar for CRC, BFRC, and RMGIC, whilst post-radiation values of contact angles were statistically lower than baseline ones for CGIC. Exposition to ionizing radiation statistically increased the microhardness of CRC, and statistically decreased the microhardness of CGIC. The surface micromorphology of all materials was changed post-radiation. Exposure to ionizing radiation negatively affected the conventional glass ionomer tested, while did not alter or improved surface properties testing of the resin composites and the resin-modified glass ionomer cement tested.

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