scholarly journals Contraction and Hydroscopic Expansion Stress of Dental Ion-Releasing Polymeric Materials

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1093
Author(s):  
Krzysztof Sokolowski ◽  
Agata Szczesio-Wlodarczyk ◽  
Kinga Bociong ◽  
Michal Krasowski ◽  
Magdalena Fronczek-Wojciechowska ◽  
...  
Keyword(s):  
Stress State ◽  
Water Sorption ◽  
Glass Ionomer Cement ◽  
Polymeric Materials ◽  
Stress Changes ◽  
Restorative Materials ◽  
Influence Of Water ◽  
Contraction Stress ◽  
Photoelastic Analysis ◽  
Absorption Dynamic

Ion-releasing polymeric restorative materials seem to be promising solutions, due to their possible anticaries effect. However, acid functional groups (monomers) and glass filler increase hydrophilicity and, supposedly, water sorption. The purpose of the study was to evaluate the influence of water sorption of polymeric materials on the stress state at the restoration-tooth interface. Beautifil Bulk Fill Flow, Beautifil Flow Plus F00, Beautifil Flow F02, Dyract eXtra, Compoglass Flow, Ionosit, Glasiosite, TwinkiStar, Ionolux and Fuji II LC were used for the study. The stress state was measured using photoelastic analysis after: 0.5, 24, 72, 96, 168, 240, 336, 504, 672, 1344 and 2016 h. Moreover, water sorption, solubility and absorption dynamic were assessed. The water sorption, solubility and absorption dynamic of ion-releasing restorative materials are material dependent properties. The overall results indicated that the tested restorative materials showed significant stress decrease. The total reduction in contraction stress and water expansion stress was not observed for materials with low value of water sorption (Beautifil Bulk Fill, Dyract eXtra, Glasionosit and Twinky Star). The photoelastic method turned out to be inadequate to evaluate stress changes of resin modified glass-ionomer cement (RMGI, Fuji II LC and Ionolux).

scholarly journals Dental Resin Cements—The Influence of Water Sorption on Contraction Stress Changes and Hydroscopic Expansion

Materials ◽  
2018 ◽  
Vol 11 (6) ◽  
pp. 973 ◽  
Author(s):  
Grzegorz Sokolowski ◽  
Agata Szczesio ◽  
Kinga Bociong ◽  
Karolina Kaluzinska ◽  
Barbara Lapinska ◽  
...  
Keyword(s):  
Water Sorption ◽  
Dental Resin ◽  
Resin Cements ◽  
Stress Changes ◽  
Influence Of Water ◽  
Contraction Stress

scholarly journals The Influence of Cement Layer Thickness on the Stress State of Metal Inlay Restorations—Photoelastic Analysis

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 599
Author(s):  
Grzegorz Sokolowski ◽  
Michal Krasowski ◽  
Agata Szczesio-Wlodarczyk ◽  
Bartlomiej Konieczny ◽  
Jerzy Sokolowski ◽  
...  
Keyword(s):  
Stress State ◽  
Layer Thickness ◽  
Resin Composite ◽  
Water Immersion ◽  
Cylindrical Sample ◽  
Resin Cement ◽  
Adhesive Resin ◽  
Cement Layer ◽  
Contraction Stress ◽  
Photoelastic Analysis

The successful restoration of teeth requires a good connection between the inlay and natural tissue. A strong bond may improve retention and reinforce tooth structure. The purpose of this study was to evaluate the influence of cement layer thickness on contraction stress generated during photopolymerization, and to determine the changes in stress state of the cement occurring during aging in water (over 84 days). Two cements were used: resin composite cement (NX3) and self-adhesive resin cement (Maxcem Elite Chroma). A cylindrical sample made of CuZn alloy was used to imitate the inlay. The stress state was measured by photoelastic analysis. The contraction stress of the inlay restoration was calculated for cement layer thicknesses of 25 µm, 100 µm, 200 µm, and 400 µm. For both tested materials, the lowest contraction stress was observed for the thinnest layer (25 µm), and this increased with thickness. Following water immersion, a significant reduction in contraction stress was observed due to hygroscopic expansion. Applying a thin layer (approximately 25 µm) of composite and self-adhesive resin cements resulted in high levels of expansion stresses (over −6 MPa) after water aging.

Polymerization contraction stress in light-cured compomer restorative materials

2003 ◽  
Vol 19 (7) ◽  
pp. 597-602 ◽  
Author(s):  
H.Y Chen ◽  
J Manhart ◽  
K.-H Kunzelmann ◽  
R Hickel
Keyword(s):  
Restorative Materials ◽  
Contraction Stress

Fluctuating Lake Levels in Rift Basins and its Impact on Extensional Tectonics

2021 ◽  
Author(s):  
April Allen Langhans ◽  
Robert Moucha ◽  
Michael Keith Paciga
Keyword(s):  
Stress State ◽  
Extensional Tectonics ◽  
Lake Levels ◽  
Rift Basins ◽  
Stress Changes ◽  
Response To Stress ◽  
Potential Impact ◽  
Extensional Model ◽  
Lithospheric Stress ◽  
Fully Coupled

<p>The feedback between climate driven processes; weathering, erosion, sediment transport, and deposition, and extensional tectonics is limited to a few studies (Burov and Cloething, 1997; Burov and Poliakov, 2001; Bialas and Buck, 2009; Theunissen and Huismans, 2019; Andrés-Martínez et al., 2019) despite these processes having been shown to impact the stress state and deformation along active orogens (Koons, 1989; Molnar and England, 1990; Avouac and Burov, 1996; Willett, 1999). Here we utilize a fully coupled landscape evolution and thermomechanical extensional model to investigate the potential impact on faulting and extension due to lake loading changes driven by changes in climate on processional timescales. Fault analyses focusing on heave, throw, and magnitude of dip on faults generated within each model are used to characterize individual faults response to stress changes and rift basin evolution. Preliminary results indicate that fluctuations in lake levels in response to climate change may impact the lithospheric stress state by changing both fault and basin geometries within an extensional basin.</p>

scholarly journals Marginal Leakage of Endodontic Temporary Restorative Materials around Access Cavities Prepared with Pre-Endodontic Composite Build-Up: An In Vitro Study

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1700
Author(s):  
Atsushi Kameyama ◽  
Aoi Saito ◽  
Akiko Haruyama ◽  
Tomoaki Komada ◽  
Setsuko Sugiyama ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Resin Composite ◽  
Glass Ionomer Cement ◽  
In Vitro Study ◽  
Restorative Material ◽  
Glass Ionomer ◽  
Zinc Oxide Eugenol ◽  
Restorative Materials ◽  
Ionomer Cement

This study aimed to examine the marginal seal between various commercial temporary restorative materials and exposed dentin/built-up composite. Sixty bovine incisors were cut above the cemento-enamel junction, and half of the dentin was removed to form a step, which was built up using flowable resin composite. The root canals were irrigated, filled with calcium hydroxide, and sealed using one of six temporary sealing materials (hydraulic temporary restorative material, temporary stopping material, zinc oxide eugenol cement, glass-ionomer cement, auto-cured resin-based temporary restorative material, and light-cured resin-based temporary restorative material) (n = 10 for each material). The samples were thermocycled 500 times and immersed in an aqueous solution of methylene blue. After 2 days, they were cut along the long axis of the tooth and the depth of dye penetration was measured at the dentin side and the built-up composite side. For the margins of the pre-endodontic resin composite build-up, the two resin-based temporary restorative materials showed excellent sealing. Hydraulic temporary restorative material had a moderate sealing effect, but the sealing effect of both zinc oxide eugenol cement and glass-ionomer cement was poorer.

Antibacterial glass-ionomer cement restorative materials: A critical review on the current status of extended release formulations

2017 ◽  
Vol 262 ◽  
pp. 317-328 ◽  
Author(s):  
Tahereh Mohammadi Hafshejani ◽  
Ali Zamanian ◽  
Jayarama Reddy Venugopal ◽  
Zahra Rezvani ◽  
Farshid Sefat ◽  
...  
Keyword(s):  
Critical Review ◽  
Extended Release ◽  
Glass Ionomer Cement ◽  
Current Status ◽  
Glass Ionomer ◽  
Restorative Materials ◽  
Extended Release Formulations ◽  
Ionomer Cement

Integrating Laboratory Testing and Numerical Modelling for a Giant Maturing Carbonate Field in UAE — II. Coupled Geomechanical Modelling of Stacked Reservoir Intervals

2021 ◽  
Author(s):  
Abdelwahab Noufal ◽  
Gaisoni Nasreldin ◽  
Faisal Al-Jenaibi ◽  
Joel Wesley Martin ◽  
Julian Guerra ◽  
...  
Keyword(s):  
Stress State ◽  
Oil And Gas ◽  
Water Injection ◽  
Seismic Inversion ◽  
Second Phase ◽  
High Porosity ◽  
Pore Collapse ◽  
Reservoir Compaction ◽  
Stress Changes ◽  
Field Management

Abstract A mature field located in a gently dipping structure onshore Abu Dhabi has multiple stacked oil and gas reservoirs experiencing different levels of depletion. The average reservoir pressure in some of these intervals had declined from the early production years to the present day by more than 2000 psi. Coupled geomechanical modelling is, therefore, of the greatest value to predict the stress paths in producing reservoir units, using the concept of effective stress. This paper examines the implications for long-term field management—focusing primarily on estimating the potential for reservoir compaction and predicting field subsidence. This paper takes the work reported in Noufal et al. (2020) one step further by integrating the results of a comprehensive geomechanical laboratory characterization study designed to assess the potential geomechanical changes in the stacked reservoirs from pre-production conditions to abandonment. This paper adopts a geomechanical modelling approach integrating a wide array of data—including prestack seismic inversion outputs and dynamic reservoir simulation results. This study comprised four phases. After the completion of rock mechanics testing, the first modelling phase examined geomechanics on a fine scale around individual wells. The goal of the second phase was to build 4D mechanical earth models (4D MEMs) by incorporating 14 reservoir models—resulting in one of the largest 4D MEMs ever built worldwide. The third phase involved determining the present-day stress state—matching calibrated post-production 1D MEMs and interpreted stress features. Lastly, the resulting model was used for field management and formation stimulation applications. The 4D geomechanical modelling results indicated stress changes in the order of several MPa in magnitude compared with the pre-production stress state, and some changes in stress orientations, especially in the vicinity of faults. This was validated using well images and direct stress measurements, indicating the ability of the 4D MEM to capture the changes in stress magnitudes and orientations caused by depletion. In the computed results, the 4D MEM captures the onset of pore collapse and its accelerating response as observed in the laboratory tests conducted on cores taken from different reservoir units. Pore collapse is predicted in later production years in areas with high porosity, and it is localized. The model highlights the influence of stress changes on porosity and permeability changes over time, thus providing insights into the planning of infill drilling and water injection. Qualitatively, the results provide invaluable insights into delineating potential sweet spots for stimulation by hydraulic fracturing.

scholarly journals Emerging Contact-Killing Antibacterial Strategies for Developing Anti-Biofilm Dental Polymeric Restorative Materials

2020 ◽  
Vol 7 (3) ◽  
pp. 83 ◽  
Author(s):  
Heba Mitwalli ◽  
Rashed Alsahafi ◽  
Abdulrahman A. Balhaddad ◽  
Michael D. Weir ◽  
Hockin H. K. Xu ◽  
...  
Keyword(s):  
Root Canal ◽  
Fungal Infections ◽  
Polymeric Materials ◽  
Bacterial Attachment ◽  
Dental Restorative Materials ◽  
First Choice ◽  
Restorative Materials ◽  
Oral Pathogens ◽  
Contact Killing ◽  
Dental Restorative

Polymeric materials are the first choice for restoring tooth cavities, bonding tooth-colored fillings, sealing root canal systems, and many other dental restorative applications. However, polymeric materials are highly susceptible to bacterial attachment and colonization, leading to dental diseases. Many approaches have been investigated to minimize the formation of biofilms over polymeric restorative materials and at the tooth/material interfaces. Among them, contact-killing compounds have shown promising results to inhibit dental biofilms. Contact-killing compounds can be immobilized within the polymer structure, delivering a long-lasting effect with no leaching or release, thus providing advantages compared to release-based materials. This review discusses cutting-edge research on the development of contact-killing compounds in dental restorative materials to target oral pathogens. Contact-killing compounds in resin composite restorations, dental adhesives, root canal sealers, denture-based materials, and crown cements have all demonstrated promising antibacterial properties. Contact-killing restorative materials have been found to effectively inhibit the growth and activities of several oral pathogens related to dental caries, periodontal diseases, endodontic, and fungal infections. Further laboratory optimization and clinical trials using translational models are needed to confirm the clinical applicability of this new generation of contact-killing dental restorative materials.

A Retrospective Study of the 3-Year Survival Rate of Resin-Modified Glass-Ionomer Cement Class II Restorations in Primary Molars

2016 ◽  
Vol 40 (1) ◽  
pp. 8-13 ◽  
Author(s):  
Mark Webman ◽  
Ezat Mulki ◽  
Rosie Roldan ◽  
Oscar Arevalo ◽  
John F Roberts ◽  
...  
Keyword(s):  
Survival Rate ◽  
Glass Ionomer Cement ◽  
Class Ii ◽  
Radiographic Evaluation ◽  
Primary Molars ◽  
Glass Ionomer ◽  
Design Data ◽  
Resin Modified Glass Ionomer ◽  
Restorative Materials ◽  
Ionomer Cement

Objective: To determine the three-year survival rate of Class II resin-modified glass-ionomer cement (RMGIC), Vitremer, restorations in primary molars and to compare these results with measurements of survival of Class II restorations of standard restorative materials. Study Design: Data on Class II restorations placed in primary molars during a six-year period were collected through a chart review and radiographic evaluation in the office of a board-certified pediatric dentist. A radiograph showing that the restoration was intact was required at least 3 years after placement to qualify as successful. If no radiograph existed, the restoration was excluded. If the restoration was not found to be intact radiographically or was charted as having been replaced before three years it was recorded as a failure. The results of this study were then compared to other standard restorative materials using normalized annual failure rates. Results: Of the 1,231 Class II resinmodified glass-ionomer cement restorations placed over six years 427 met the inclusion criteria. There was a 97.42% survival rate for a 3-year period equivalent to an annual failure rate of 0.86%. Conclusions: A novel approach comparing materials showed that in this study Vitremer compared very favorably to previously published success rates of other standard restorative materials (amalgam, composite, stainless steel crown, compomer) and other RMGIC studies.

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