scholarly journals Influence of an Alkoxylation Grade of Acrylates on Shrinkage of UV-Curable Compositions

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2617 ◽  
Author(s):  
Zbigniew Czech ◽  
Janina Kabatc ◽  
Marcin Bartkowiak ◽  
Karolina Mozelewska ◽  
Dominika Kwiatkowska
Keyword(s):  
Dental Materials ◽  
Uv Curing ◽  
Inorganic Filler ◽  
Uv Curable ◽  
Polymerization Shrinkage ◽  
Restorative Materials ◽  
Recent Developments ◽  
Contraction Stress ◽  
Restorative Composites ◽  
Restorative Dental Materials

Commercially available UV curable restorative materials are composed of inorganic filler hydroxyapatite, multifunctional methacrylate, photoinitiator and alkoxylated acrylate. Especially, the application of alkoxylated monomers with different alkoxylation grade allows the reduction of polymerization shrinkage which plays the major role by application of low shrinkage composites as high quality restorative dental materials or other adhesive materials in the form of UV-polymerized self-adhesive acrylics layers (films). There are several ways to reduce polymerization shrinkage of restorative compositions, for example, by adjusting different alkoxylated acrylic monomers, which are integral part of investigated UV curable restorative composites. This article is focused on the studies of contraction-stress measured as shrinkage during UV-initiated curing of restorative composites containing various commercially available alkoxylated acrylates. Moreover, studies with experimental restorative materials and recent developments typical for UV curing technology using special photoreactive monomers are described.

scholarly journals Polymerization shrinkage by investigation of uv curable dental restorative composites containing multifunctional methacrylates

2013 ◽  
Vol 15 (2) ◽  
pp. 81-85 ◽  
Author(s):  
Jolanta Świderska ◽  
Zbigniew Czech ◽  
Agnieszka Kowalczyk
Keyword(s):  
Dental Materials ◽  
Uv Curing ◽  
Triethylene Glycol ◽  
Polymerization Process ◽  
Dental Composites ◽  
Glycol Dimethacrylate ◽  
Uv Curable ◽  
Radiation Curing ◽  
Polymerization Shrinkage ◽  
Curing Shrinkage

Typical commercial restorative dental compositions in the form of medical resins contain in-organic fillers, multifunctional methacrylates and photoinitiators. The currently used resins for direct composite restoratives have been mainly based on acrylic chemistry to this day. The main problem with the application and radiation curing process is the shrinkage of photoreactive dental materials during and after UV curing. Shrinkage of restorative radiation curable dental composites is a phenomenon of polymerization shrinkage, typical behavior of multifunctional methacrylates during the polymerization process. The important factors in curing of dental composites are: the kind and concentration of the used methacrylate, its functionality, double bond concentration, the kind and concentration of the added photoinitiator and UV dose emitted by the UV-lamp. They are investigated multifunctional 1,3-butanediol dimethacrylate (1,3-BDDMA), diethylene glycol dimethacrylate (DEGDMA), triethylene glycol dimethacrylate (TEGDMA), trimethylolpropane trimethacrylate (TMPTMA), 2,2-bis-[4-(2-hydroxy-3-methacryxloyloxypropyl) phenyl]propane (Bis-GMA), ethoxylated Bis-GMA (EBPDMA) and dodecandiol dimethacrylate (DDDMA). Reduction of polymerization shrinkage of restorative dental compositions is at the moment a major problem of dental technology. This problem can be solved through an application of photoreactive non-tacky multifunctional methacrylates in the investigated dental adhesive fillings.

scholarly journals Testing Sealing Properties of Restorative Materials Against Moist Dentin

1987 ◽  
Vol 66 (12) ◽  
pp. 1758-1764 ◽  
Author(s):  
L.G. Terkla ◽  
A.C. Brown ◽  
A.P. Hainisch ◽  
J.C. Mitchem
Keyword(s):  
Composite Resin ◽  
Dental Materials ◽  
Human Tooth ◽  
Laboratory System ◽  
Filling Material ◽  
Glass Ionomer ◽  
Buffer Solution ◽  
Bonding Agents ◽  
Restorative Materials ◽  
Restorative Dental Materials

The objectives of this investigation were (1) to develop a sensitive laboratory system that simulates the physiological and clinical conditions of a prepared human tooth in order to facilitate the determination of the bonding and sealing efficacies of restorative dental materials and (2) to conduct experiments with two dentin bonding agents, two posterior composite resin restorative materials (hybrid and micro filled), and a glass-ionomer type II filling material. The system functioned well and provided data to indicate that, after margination, the two posterior composite resin restorative materials performed equally and both performed better than the glass-ionomer filling material; none of the materials provided a perfect seal immediately after insertion, although some restorations demonstrated perfect seals from 16 hours to 28 days after placement; the seal of the glass-ionomer material improved after 28 days of storage in buffer solution; each successive step in the respective composite resin procedures improved the seal except in one case for the micro filled resin.

Relationship Between Shrinkage and Stress

2011 ◽  
pp. 1374-1392
Author(s):  
Antheunis Versluis ◽  
Daranee Tantbirojn
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Clinical Symptoms ◽  
Dental Materials ◽  
Vital Role ◽  
Controlling Factors ◽  
Shrinkage Stress ◽  
Polymerization Shrinkage ◽  
Multiple Factors ◽  
Restorative Dental Materials

Residual stress due to polymerization shrinkage of restorative dental materials has been associated with a number of clinical symptoms, ranging from post-operative sensitivity to secondary caries to fracture. Although the concept of shrinkage stress is intuitive, its assessment is complex. Shrinkage stress is the outcome of multiple factors. To study how they interact requires an integrating model. Finite element models have been invaluable for shrinkage stress research because they provide an integration environment to study shrinkage concepts. By retracing the advancements in shrinkage stress concepts, this chapter illustrates the vital role that finite element modeling plays in evaluating the essence of shrinkage stress and its controlling factors. The shrinkage concepts discussed in this chapter will improve clinical understanding for management of shrinkage stress, and help design and assess polymerization shrinkage research.

scholarly journals Properties evaluation of silorane, low-shrinkage, non-flowable and flowable resin-based composites in dentistry

2015 ◽  
Author(s):  
Rodrigo Maia ◽  
Rodrigo S Reis ◽  
Andre FV Moro ◽  
Cesar Perez ◽  
Bárbara Pessôa ◽  
...  
Keyword(s):  
Filler Content ◽  
Important Determinant ◽  
Dental Materials ◽  
Dental Practice ◽  
Polymerization Shrinkage ◽  
Depth Of Cure ◽  
Knoop Microhardness ◽  
Properties Of Materials ◽  
Restorative Dental Materials

Purpose: This study tested the null hypothesis that different classes of direct restorative dental materials (silorane-based resin, low-shrinkage and conventional (non-flowable and flowable) resin-based composite (RBC)) do not differ from each other with regard to polymerization shrinkage, depth of cure, or microhardness. Methods: 140 RBC samples were fabricated and tested by one calibrated operator. Polymerization shrinkage was measured using a gas pycnometer both before and immediately after curing with 36 J/cm2 light energy density. Depth of cure was determined, using a penetrometer and the Knoop microhardness was tested from the top surface to a depth of 5 mm. Results: Considering polymerization shrinkage, the authors found significant differences (p<0,05) between different materials: non-flowable RBCs showed lower values, compared to flowable RBCs, with the silorane-based resin presenting the smallest shrinkage. The low shrinkage flowable composite performed similarly to non-flowable, with significant statistical differences compared to the two other flowable RBCs. Regarding to depth of cure, low-shrinkage flowable RBC were most effective compared to other groups. Microhardness was generally higher for the non-flowable vs. flowable RBCs (p<0.05). However, the values for low-shrinkage flowable did not differ significantly from those of non-flowable, but were significantly higher than those of the other flowable RBCs. Clinical Significance: RBCs have undergone many modifications as they have evolved and represent the most relevant restorative materials in today’s dental practice. This study of low-shrinkage RBCs, conventional RBCs (non-flowable and flowable) and silorane-based composite – by in vitro evaluation of volumetric shrinkage, depth of cure and microhardness – reveals that although filler content is an important determinant of polymerization shrinkage, it is not the only variable that affects properties of materials that were tested in this study.

scholarly journals Reducing of on Polymerization Shrinkage by Application of UV Curable Dental Restorative Composites

2014 ◽  
Vol 16 (3) ◽  
pp. 51-55 ◽  
Author(s):  
Jolanta Świderska ◽  
Zbigniew Czech ◽  
Waldemar Świderski ◽  
Agnieszka Kowalczyk
Keyword(s):  
Uv Curing ◽  
Polymerization Process ◽  
Dental Composites ◽  
Tetraethylene Glycol ◽  
Curing Process ◽  
Glycol Dimethacrylate ◽  
Uv Curable ◽  
Polymerization Shrinkage ◽  
Polyethylene Glycol 200 ◽  
Uv Curing Process

Abstract This manuscript describes dental compositions contain in-organic fillers, multifunctional methacrylates and photoinitiators. The main problem by application and UV curing process is the shrinkage of photoreactive dental materials during and after UV curing process. Total shrinkage of UV curable dental composites is a phenomenon of polymerization shrinkage, typical behavior for multifunctional methacrylates during polymerization process. The important factors by curing of dental composites are: kind and concentration of used methacrylates, their functionality, double bond concentration, kind and concentration of added photoinitiator and UV dose. They are investigated UV-curable dental compositions based on 2,2-bis-[4-(2-hydroxy-3-methacryxloyloxypropyl)phenyl]propane (Bis-GMA) and containing such multifunctional monomers as 1,3-butanediol dimethacrylate (1,3-BDDMA), diethylene glycol dimethacrylate (DEGDMA), tetraethylene glycol dimethacrylate (T3EGDMA), trimethylolpropane trimethacrylate (TMPTMA), polyethylene glycol 200 dimethacrylate (PEG200DA). Reduction of polymerization shrinkage of dental compositions is at the moment a major problem by dental technology.

Relationship Between Shrinkage and Stress

2010 ◽  
pp. 45-64 ◽  
Author(s):  
Antheunis Versluis ◽  
Daranee Tantbirojn
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Clinical Symptoms ◽  
Dental Materials ◽  
Vital Role ◽  
Controlling Factors ◽  
Shrinkage Stress ◽  
Polymerization Shrinkage ◽  
Multiple Factors ◽  
Restorative Dental Materials

Residual stress due to polymerization shrinkage of restorative dental materials has been associated with a number of clinical symptoms, ranging from post-operative sensitivity to secondary caries to fracture. Although the concept of shrinkage stress is intuitive, its assessment is complex. Shrinkage stress is the outcome of multiple factors. To study how they interact requires an integrating model. Finite element models have been invaluable for shrinkage stress research because they provide an integration environment to study shrinkage concepts. By retracing the advancements in shrinkage stress concepts, this chapter illustrates the vital role that finite element modeling plays in evaluating the essence of shrinkage stress and its controlling factors. The shrinkage concepts discussed in this chapter will improve clinical understanding for management of shrinkage stress, and help design and assess polymerization shrinkage research.

In Vitro Evaluation of Surface Roughness and Microhardness of Restorative Materials Submitted to Erosive Challenges

2011 ◽  
Vol 36 (4) ◽  
pp. 397-402 ◽  
Author(s):  
ALF Briso ◽  
LP Caruzo ◽  
APA Guedes ◽  
A Catelan ◽  
PH dos Santos
Keyword(s):  
Surface Roughness ◽  
Clinical Relevance ◽  
Dental Materials ◽  
Dental Erosion ◽  
In Vitro Evaluation ◽  
Acidic Solutions ◽  
Restorative Materials ◽  
Restorative Dental Materials ◽  
Surface Sealant

Clinical Relevance The effects of dental erosion caused by acidic solutions on the surface of restorative dental materials could be minimized by the application of a surface sealant.

scholarly journals Properties evaluation of silorane, low-shrinkage, non-flowable and flowable resin-based composites in dentistry

2015 ◽  
Author(s):  
Rodrigo Maia ◽  
Rodrigo S Reis ◽  
Andre FV Moro ◽  
Cesar Perez ◽  
Bárbara Pessôa ◽  
...  
Keyword(s):  
Filler Content ◽  
Important Determinant ◽  
Dental Materials ◽  
Dental Practice ◽  
Polymerization Shrinkage ◽  
Depth Of Cure ◽  
Knoop Microhardness ◽  
Properties Of Materials ◽  
Restorative Dental Materials

Purpose: This study tested the null hypothesis that different classes of direct restorative dental materials (silorane-based resin, low-shrinkage and conventional (non-flowable and flowable) resin-based composite (RBC)) do not differ from each other with regard to polymerization shrinkage, depth of cure, or microhardness. Methods: 140 RBC samples were fabricated and tested by one calibrated operator. Polymerization shrinkage was measured using a gas pycnometer both before and immediately after curing with 36 J/cm2 light energy density. Depth of cure was determined, using a penetrometer and the Knoop microhardness was tested from the top surface to a depth of 5 mm. Results: Considering polymerization shrinkage, the authors found significant differences (p<0,05) between different materials: non-flowable RBCs showed lower values, compared to flowable RBCs, with the silorane-based resin presenting the smallest shrinkage. The low shrinkage flowable composite performed similarly to non-flowable, with significant statistical differences compared to the two other flowable RBCs. Regarding to depth of cure, low-shrinkage flowable RBC were most effective compared to other groups. Microhardness was generally higher for the non-flowable vs. flowable RBCs (p<0.05). However, the values for low-shrinkage flowable did not differ significantly from those of non-flowable, but were significantly higher than those of the other flowable RBCs. Clinical Significance: RBCs have undergone many modifications as they have evolved and represent the most relevant restorative materials in today’s dental practice. This study of low-shrinkage RBCs, conventional RBCs (non-flowable and flowable) and silorane-based composite – by in vitro evaluation of volumetric shrinkage, depth of cure and microhardness – reveals that although filler content is an important determinant of polymerization shrinkage, it is not the only variable that affects properties of materials that were tested in this study.

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.

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
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