scholarly journals A Novel Technique for Bulk-Fill Resin-Based Restorations: Achieving Function and Esthetics in Posterior Teeth

2017 ◽  
Vol 2017 ◽  
pp. 1-5
Author(s):  
Gerardo Durán Ojeda ◽  
Ismael Henríquez Gutiérrez ◽  
José Pablo Tisi ◽  
Abelardo Báez Rosales
Keyword(s):  
Mechanical Properties ◽  
Composite Resins ◽  
Shrinkage Stress ◽  
Posterior Teeth ◽  
Polymerization Shrinkage ◽  
Reflective Index ◽  
Novel Technique

Advances in the mechanical properties of composite resins have allowed for their use in posterior teeth. Conventional resins have several problems associated with polymerization shrinkage stress. The development of “bulk-fill” resins has allowed for their use in single increments up to depths of 4 mm, with very low polymerization shrinkage stress. Nevertheless, differences in anatomy and the desire for optimal esthetics present unique difficulties. This article describes a step-by-step technique using flowable bulk-fill resin as a substitute for dentin in a single increment, together with a high-reflective-index resin to restore enamel and decrease clinical time, obtaining anatomically and esthetically acceptable results without detriment to the mechanical properties required to restore the functionality of the posterior teeth.

Post-gel and Total Shrinkage Stress of Conventional and Bulk-fill Resin Composites in Endodontically-treated Molars

2020 ◽  
Vol 45 (5) ◽  
pp. E217-E226
Author(s):  
RA da Silva Pereira ◽  
GF de Bragança ◽  
ABF Vilela ◽  
RA de Deus ◽  
RR Miranda ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Composite Resin ◽  
Composite Resins ◽  
Shrinkage Stress ◽  
Element Analysis ◽  
Posterior Teeth ◽  
Polymerization Shrinkage ◽  
Total Shrinkage ◽  
Selection Of

Clinical Relevance The clinician should consider the polymerization shrinkage stress when selecting a composite resin for posterior restorations. The use of post-gel shrinkage values should guide the selection of a composite resin for posterior teeth. SUMMARY Objectives: The objective of this study was to evaluate the effect of the method used for calculation of polymerization shrinkage, total or post-gel, on the shrinkage stress of conventional and bulk-fill composite resins for restoring endodontically treated teeth using finite element analysis. Methods and Materials: Four composite resins were tested for post-gel shrinkage (P-Shr) by the strain-gauge test and total shrinkage (TShr) using an optical method (n=10). Two conventional composite resins, Filtek Z350 XT (3M-ESPE; Z350) and TPH3 Spectrum (Dents-ply; TPH3) and two bulk-fill composite resins. Filtek Bulk-Fill Posterior (3M-ESPE; POST) SureFil SDR flow (Dentsply; SDR) were tested. Elastic modulus (E), diametral tensile strength (DTS), and compressive strength (CS) were also determined (n=10). The residual shrinkage stress was evaluated by finite element analysis with four restorative techniques: incremental with Z350 and TPH3; SDR/TPH3 (two bulk increments of 4 mm and two occlusal increments); and two bulk increments of 5 mm for POST. Data for P-Shr, T-Shr, E, DTS, and CS were analyzed by analysis of variance and Tukey’s test (α=0.05), and residual shrinkage was analyzed quantitatively and qualitatively by the modified von Mises criteria. Results: SDR had the lowest CS values, POST and TPH3 had similar and intermediate values, and Z350 had the highest CS. TPH3 and Z350 had similar DTS values and values higher than SDR. Z350 and POST had higher P-Shr, and SDR had lower T-Shr. T-Shr resulted in higher shrinkage stress than P-Shr values. SDR/TPH3 resulted in higher shrinkage stress when using T-Shr and lower values when using the P-Shr value. Conclusion: T-Shr resulted in higher stress in the enamel and in root dentin close to the pulp chamber than P-Shr values. The selection of the T-Shr or P-Shr changed the ranking of the shrinkage stress of the tested composite resin.

scholarly journals Evaluation of Polymerization shrinkage of 2 types of posterior composite resins

2017 ◽  
Vol 07 (01) ◽  
pp. 025-028
Author(s):  
Lakshmi Nidhi Rao ◽  
Mithra N. Hegde ◽  
Aditya Shetty
Keyword(s):  
Clinical Outcome ◽  
T Test ◽  
Composite Resins ◽  
Restorative Material ◽  
Restorative Dentistry ◽  
Posterior Teeth ◽  
Polymerization Shrinkage ◽  
Glass Fibres ◽  
First Choice ◽  
Significant Difference

AbstractComposite resins represent a class of material widely used in restorative dentistry, not only for anterior aesthetics but also as the first choice to restore posterior teeth. However the key limitation in the use of composite resins as a restorative material is related to shrinkage during polymerization which leads to poor marginal seal, marginal staining, restoration displacement, tooth fracture and recurring caries [1].Polymerization shrinkage may affect negatively the clinical outcome of the restoration. Hence the present study evaluates the Polymerization shrinkage of 2 different posterior composites; Filtek Z350(3M) and everX Posterior(GC), using a pycnometer.Independent Sample T-Test was used to determine statistically significant difference in volumetric shrinkage among the tested composite resins. everX Posterior showed comparatively less shrinkage than Filtek Z350; which can be attributed to the presence of silanated e-glass fibres.

scholarly journals THE COMPARISON OF RESIN-BASED COMPOSITES PHYSICAL PROPERTIES BETWEEN BULK-FILL TECHNIQUE AND INCREMENTAL TECHNIQUE

2021 ◽  
Vol 6 (1) ◽  
pp. 85
Author(s):  
Rahmi Khairani Aulia
Keyword(s):  
Physical Properties ◽  
Composite Resin ◽  
Color Stability ◽  
Composite Resins ◽  
Shrinkage Stress ◽  
Restorative Material ◽  
Polymerization Shrinkage ◽  
Advantages And Disadvantages ◽  
Restoration Technique ◽  
Restoration Failure

ABSTRACT:Composite resins are currently the most popular restorative material in dentistry. This is due to good aesthetics and maximum conservation ability. Behind these advantages, there are disbenefits of composite resin materials, such as polymerization shrinkage, which can lead to restoration failure. Various attempts have been investigated to reduce the shrinkage incidence of composite resins, one of which is the technique of placing the restorative material into the cavity. The restoration filling technique is recognized as a significant factor in shrinkage stress. By using a special filling technique, the polymerization shrinkage damage stress can be reduced. There are several techniques in performing composite resin fillings, including bulk and incremental techniques. These techniques have their respective advantages and disadvantages. The aim of this literature review was to compare the physical properties of composite resin restorations with bulk filling and incremental techniques. Physical properties that being studied include polymerization shrinkage, stress shrinkage, degree of conversion, bonding strength, water resorption, color stability, and temperature increase. Comparing the two techniques, composite resin with incremental filling technique has superior physical properties compared to bulk technique. From the comparison of the two techniques, the composite resin with incremental filling technique has superior physical properties compared to the bulk technique, especially in higher conversion which causes lower shrinkage stress. This situation makes the incremental technique provide better bond strength, water resorption, color stability, and lower temperature rise.Keywords: Bulk, Composite Resin, Incremental,  Physical Properties, Restoration, Restoration Technique

scholarly journals Polymerization shrinkage stress of composite resins and resin cements – What do we need to know?

2017 ◽  
Vol 31 (suppl 1) ◽  
Author(s):  
Carlos José SOARES ◽  
André Luis FARIA-E-SILVA ◽  
Monise de Paula RODRIGUES ◽  
Andomar Bruno Fernandes VILELA ◽  
Carmem Silvia PFEIFER ◽  
...  
Keyword(s):  
Composite Resins ◽  
Shrinkage Stress ◽  
Resin Cements ◽  
Polymerization Shrinkage

scholarly journals Polymerization shrinkage stress of composites photoactivated by different light sources

2009 ◽  
Vol 20 (4) ◽  
pp. 319-324 ◽  
Author(s):  
Fernanda de Carvalho Panzeri Pires de Souza ◽  
Brahim Drubi Filho ◽  
Luciana Assirati Casemiro ◽  
Lucas da Fonseca Roberti Garcia ◽  
Simonides Consani
Keyword(s):  
Light Emitting Diode ◽  
Testing Machine ◽  
Adhesive System ◽  
Composite Resins ◽  
Shrinkage Stress ◽  
Light Sources ◽  
Polymerization Shrinkage ◽  
Light Emitting ◽  
Halogen Light ◽  
Glass Rods

The purpose of this study was to compare the polymerization shrinkage stress of composite resins (microfilled, microhybrid and hybrid) photoactivated by quartz-tungsten halogen light (QTH) and light-emitting diode (LED). Glass rods (5.0 mm x 5.0 cm) were fabricated and had one of the surfaces air-abraded with aluminum oxide and coated with a layer of an adhesive system, which was photoactivated with the QTH unit. The glass rods were vertically assembled, in pairs, to a universal testing machine and the composites were applied to the lower rod. The upper rod was placed closer, at 2 mm, and an extensometer was attached to the rods. The 20 composites were polymerized by either QTH (n=10) or LED (n=10) curing units. Polymerization was carried out using 2 devices positioned in opposite sides, which were simultaneously activated for 40 s. Shrinkage stress was analyzed twice: shortly after polymerization (t40s) and 10 min later (t10min). Data were analyzed statistically by 2-way ANOVA and Tukey's test (a=5%). The shrinkage stress for all composites was higher at t10min than at t40s, regardless of the activation source. Microfilled composite resins showed lower shrinkage stress values compared to the other composite resins. For the hybrid and microhybrid composite resins, the light source had no influence on the shrinkage stress, except for microfilled composite at t10min. It may be concluded that the composition of composite resins is the factor with the strongest influence on shrinkage stress.

Evaluation of the formation of marginal gaps in preheated composite resin restorations

2014 ◽  
Author(s):  
Marco Antonio Gallito
Keyword(s):  
Room Temperature ◽  
Composite Resin ◽  
Resin Composite ◽  
Polymeric Materials ◽  
Sem Analysis ◽  
Composite Resins ◽  
Posterior Teeth ◽  
Polymerization Shrinkage ◽  
Composite Resin Restorations ◽  
Resin Restorations

Composite resins are polymeric restorative materials that have acceptable mechanical properties, so they are used in anterior and posterior teeth. There is, however, polymerization shrinkage inherent in the polymeric materials. This contraction is responsible for the formation of cracks at the interface of the restoration. These gaps contribute to the staining of the composite resin and the appearance of cavities. In order to minimize the effects of polymerization shrinkage, variations in restorative technique has been introduced to fulfill this goal. The preheating resin composite is one of them.This study aimed to assess the formation of marginal gaps, using scan electron microscopy, in composite resin restorations created using one room-temperature composite resin and one preheated to 60°C. 20 recently-extracted human molars with circular cavities in the surface dentine of each proximal surface were used. The cavities were restored using Filtek Z350 (3M) composite resin affixed with Adper Scotchbond Multipurpose Adhesive (3M) and divided into two groups of 10 samples: group 1 – room-temperature composite resin restorations (n=10) and group 2 – composite resin restorations preheated to 60oC (n=10). The samples were kept in a bacteriological incubator for a period of seven days. After this, the restorations were polished and epoxy resin replicas were created using a casting with addition silicone for subsequent SEM analysis. The gaps were measured with the aid of UTHSCSA Image tool software and the results were submitted to Student “t” test statistical analysis, achieving the following results: the highest marginal gap figures were obtained with Filtek Z350 resin preheated to 60oC (t= -3.961 and p=0.000). Based on the methodology employed and the results achieved, it can be concluded that there was a greater formation of marginal gaps in the dentin-composite resin interface where Filtek Z350 resin preheated to 60°C was used for restorations, thus making it preferable to use room-temperature composite resin.Keywords:Composite resin. Marginal gaps. Electronic microscopy.

scholarly journals Polymerization shrinkage evaluation of three packable composite resins using a gas pycnometer

2003 ◽  
Vol 17 (3) ◽  
pp. 273-277 ◽  
Author(s):  
Ricardo Amore ◽  
Clóvis Pagani ◽  
Michel Nicolau Youssef ◽  
Camillo Anauate Netto ◽  
Hugo Roberto Lewgoy
Keyword(s):  
Light Source ◽  
Composite Resin ◽  
Composite Resins ◽  
Restorative Dentistry ◽  
Adhesive Systems ◽  
Posterior Teeth ◽  
Composite Surface ◽  
Polymerization Shrinkage ◽  
Before And After

Modern restorative dentistry has been playing an outstanding role lately since composite resins, allied to adhesive systems, have been widely applied on anterior and posterior teeth restorations. The evolution of composite resins has mostly been verified due to the improvement of their aesthetic behavior and the increase in their compressive and abrasive strengths. In spite of these developments, the polymerization shrinkage inherent to the material has been a major deficiency that, so far, has been impossible to avoid. Using a gas pycnometry, this research investigated the polymerization shrinkage of three packable composite resins: Filtek P60 (3M), Prodigy Condensable (Kerr), and SureFil (Dentsply/Caulk), varying the distance from the light source to the surface of the resins (2 mm or 10 mm). The pycnometer Accupyc 1330 (Micromeritics, USA) precisely records helium displacement, allowing fast and reliable measurements of the volume of composite resin immediately before and after polymerization, without interference of temperature or humidity. Results were not found to be statistically different for the three tested resins, either for 2 mm or 10 mm-distance from the light source to the composite surface.

scholarly journals Influence of composite resin volume and C-factor on the polymerization shrinkage stress

2016 ◽  
Vol 19 (2) ◽  
pp. 72 ◽  
Author(s):  
Rafael Francisco Lia Mondelli ◽  
Marilia Mattar de Amoêdo Campos Velo ◽  
Rafael Simões Gonçalves ◽  
Bhenya Ottoni Tostes ◽  
Sergio Kiyoshi Ishikiriama ◽  
...  
Keyword(s):  
Composite Resin ◽  
In Vitro Study ◽  
Composite Resins ◽  
Steel Plates ◽  
Shrinkage Stress ◽  
Lower Stress ◽  
Polymerization Shrinkage ◽  
Light Curing ◽  
Clinical Problems

<p>Objective: Composite polymerization shrinkage<br />stress is an inherent process of chemical and light<br />composite resin activation. Consequently, this fact has<br />been associated to potential clinical problems. The<br />aim of the present in vitro study was to evaluate the<br />volume and C-factor influence on chemical and lightcuring<br />composite resin polymerization shrinkage<br />stress, using a non-rigid method that thereby provides<br />lower stress values, causing a minimal deflection in<br />load cell. Materials and Methods: The contraction<br />forces of the Z-250 and Concise composite resins<br />during polymerization were recorded in an UTM in<br />two experiments. In the first experiment, the Z-250<br />composite was inserted beetwen two rectangular<br />steel plates (6.0 x 2.0 mm), varyng the resin volumes<br />and C-factors, in a single increment, polymerized for<br />20 s and the forces generated were recorded for 120<br />s. In the second experiment, a pair of rectangular steel<br />plates (3x2mm) and two square steel plates (2x2mm),<br />with varied heights (2; 3 mm, respectively), were<br />used to determine the C-factor (0.6; 0.3) influence.<br />Results: The polymerized Z-250 results showed that<br />the volume variations, independent of the C-factor,<br />had a direct influence on the shrinkage stress,<br />different from the Concise, which was influenced by<br />the C-factor. Conclusion: The present study showed<br />that a higher volume of composite resins determines<br />an increase in the shrinkage stress of light-curing<br />composites.</p><p><strong>Keywords</strong></p><p>C-factor. Composite resin. Polymerization. Shrinkage<br />stress.</p>

Mechanical Properties and Polymerization Shrinkage of Composite Resins Light-Cured Using Two Different Lasers

2015 ◽  
Vol 33 (4) ◽  
pp. 213-219 ◽  
Author(s):  
Tae-Wan Kim ◽  
Jang-Hoon Lee ◽  
Seung-Hwa Jeong ◽  
Ching-Chang Ko ◽  
Hyung-Il Kim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Resins ◽  
Polymerization Shrinkage

scholarly journals Indicações e propriedades mecânicas das resinas compostas convencionais e resinas compostas do tipo bulk-fill: revisão de literatura

2021 ◽  
Vol 12 (1) ◽  
pp. 39
Author(s):  
Letícia Meinberg Pedrosa ◽  
Amanda De Oliveira Pinto Ribeiro ◽  
João Victor Frazão Câmara ◽  
Josué Junior Araujo Pierote
Keyword(s):  
Mechanical Properties ◽  
Clinical Performance ◽  
Composite Resins ◽  
Restorative Material ◽  
Central Theme ◽  
Inclusion Criteria ◽  
Exclusion Criteria ◽  
Polymerization Shrinkage ◽  
Dental Offices ◽  
Made In

Composite resins are restorative materials widely used in dental offices due to their mechanical properties, aesthetics and clinical performance. However, the polymerization shrinkage present in conventional composites is still a major limitation. In this context, resins called bulk-fill, or filling resins, were developed, which have the possibility of inserting a single increment in the dental cavity due to less polymerization shrinkage, better mechanical properties, easy execution, and as a consequence the decrease in clinical time. However, there is still no consensus in the literature regarding the effectiveness and durability of this material. The objective of this study was to carry out a bibliographic review on bulk-fill resins and their comparison with conventional resins. Scientific articles in Portuguese and English from 2002 to 2019 were searched in the databases Medical Publications (PUBMED) and Scientific Eletronic Library Online (SCIELO), with 50 papers selected for full reading based on the inclusion criteria: language in English or Portuguese and publications made in the last twenty years and exclusion criteria: articles that did not address the central theme of the study, publications in languages other than English or Portuguese, electronic articles not available for full reading and periodicals outside the established period. According to the researched bibliography, filling resins are an option of restorative material, which have been showing success similar to that found in rehabilitation with conventional composite resins.

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