Effect of temperature on composite polymerization stress and degree of conversion

Calheiros, Fernanda Calabró; Daronch, Márcia; Rueggeberg, Frederick A.; Braga, Roberta da Rocha

doi:10.1016/j.dental.2014.02.024

Cited by 53 publications

(57 citation statements)

References 22 publications

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Section: Introductionmentioning

confidence: 99%

“…A previous study revealed higher stress values at increased composite temperatures, but only tested one single brand of 4 composite material. 16 Since reaction kinetics and factors such as thermal conductivity and specific heat capacity differ depending on material composition, 17,18 the effect of pre-heating on shrinkage force formation might vary between different composite materials. Recently, a new category of resin-based composite materials, so-called 'bulk-fill' resin composites, has been introduced to the market in an attempt to simplify and expedite the restoration process. According to the manufacturers, these materials can be adequately photopolymerized in thick layers up to 4 or even 5 mm, which has been confirmed for the majority of bulk-fill composites in studies using infrared spectroscopy 13,19,20 and/or microhardness depth profiles, [19][20][21] and been attributed to increased light transmittance of these materials.…”

Section: Introductionmentioning

confidence: 99%

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Pre-heating of high-viscosity bulk-fill resin composites: Effects on shrinkage force and monomer conversion

Tauböck

Tarle

Marović

et al. 2015

Journal of Dentistry

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pre-heating of high-viscosity bulk-fill resin composites: Effects on shrinkage force and monomer conversion

Tauböck

Tarle

Marović

et al. 2015

Journal of Dentistry

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“…Negative effects of polymerization shrinkage and stress development can be compensated by the improved marginal adaptation and shortened light curing time of the heated composite. In a study conducted by Calherios et al, it was found that light activation of composite filler heated to 40-60 0 C for 5 seconds resulted in 47-55% stress reduction, compared to light curing of composite at room temperature for 20 seconds (23).…”

Section: S E L E C T I O N Of Co M P O S I T E a P P L I Ca T I O N Tmentioning

confidence: 99%

Reduction of polymerization shrinkage in adhesive restaurations

Dačić¹,

Miljković²,

Mitić³

et al. 2019

Acta fac medic Naissensis

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Composite materials used for the restoration of lost dental tissues fulfill almost all functional and aesthetic requirements. However, polymerization shrinkage still remains the main problem of light-curing composite resins. The consequences of this phenomenon are microfractures and microleakage in the marginal areas of the composite restoration.The aim of this paper is to present the most important methods for reducing polymerization shrinkage of adhesive restorations, based on the contemporary literature available. These methods include changes in the chemical composition of the composite, correct application technique of the adhesive-composite system and selection of the appropriate light curing protocol.In the last few years, composite materials have experienced significant changes in the chemical composition in order to compensate for their major shortcomings. By introducing pre-polymerized filler particles, alternative matrices based on silorane and ormocer, and new germanium-based photoinitiators, the degree of polymerization shrinkage has been significantly reduced.Optimal adhesive bond between the filling and the tooth can compensate volumetric shrinkage of material which occurs during polymerization. Numerous studies have shown that total-etch adhesive systems, in comparison with self-etch, form a better adhesive bond to hard dental tissues. Polymerization shrinkage can also be reduced and marginal adaptation improved by applying a stress-absorbing layer and preheated composite.With the use of modified light-curing protocols, such as soft start with reduced initial light intensity, and pulse-delayed with relaxation period, the negative effects of polymerization shrinkage and stress development can be further reduced, and the risk of microfracture formation minimized. 2019; 36(4):334-342 335 4 Odeljenje za stomatološku protetiku, Klinika za stomatologiju, Niš, Srbija 5 Univerzitet u Kragujevcu, Fakultet medicinskih nauka, Departman za stomatologiju, Kragujevac, Srbija Acta facultatis medicae NaissensisSAŽETAK Kompozitni materijali koji se danas koriste za restauraciju izgubljenih zubnih tkiva, ispunjavaju skoro sve funkcionalne i estetske zahteve. Međutim, glavni problem svetlosnopolimerizujućih kompozita i dalje ostaje pojava kontrakcije prilikom polimerizacije. Posledice ovog fenomena su nastanak mikropukotine i mikrocurenja u predelu marginalnog spoja. Cilj ovog rada je da na osnovu savremene dostupne literature, predstavi najznačajnije metode za smanjenje kontrakcije adhezivnih restauracija. To su: promena hemijskog sastava kompozita, pravilna tehnika aplikovanja adhezivno-kompozitnog sistema i izbor odgovarajućeg režima svetlosne polimerizacije. Kompozitni materijali su zadnjih godina doživeli najviše promena u pogledu hemijskog sastava, sa ciljem kompenzovanja njihovih glavnih nedostataka. Uvođenjem prepolimerizovanih čestica punioca, alternativnih matriksa na bazi silorana i ormocera, i novih fotoinicijatora na bazi germanijuma, u značajnoj meri je redukovan stepen polimerizacione kontrakcije. Kva...

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“…O uso da resina composta em cápsulas pré-fabricadas (compules) aquecidas por dispositivos (Figura 5 A) que mantenham temperaturas entre 50 o C e 60 o C permite a inserção em camadas que atingem um maior grau de conversão e, consequentemente, possibilita a redução do tempo clínico, garantindo, também, uma polimerização mais eficiente ao utilizar matrizes de aço 15,16 . A seringa de resina composta também pode ser aquecida ou inserida em ponteiras descartáveis para facilitar sua aplicação (Figura 5 B).…”

Section: Figura 5 -Materiais E Métodos Indicados Para a Confecção De unclassified

Reabilitação oral do desgaste dentário severo com resina composta

Mesko

Cenci

Loomans

et al. 2016

Rev. da Fac. de Odontologia, UPF

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Introdução: a utilização de resinas compostas diretas tem sido ampliada devido a melhoras tanto nas propriedades adesivas quanto nas propriedades físicas dos materiais. Aprimoramentos técnicos também fizeram com que os compósitos passassem a ser utilizados inclusive na reabilitação de casos de extensas perdas de tecidos dentários, mostrando um bom desempenho clínico em estudos longitudinais. As reabilitações das lesões não cariosas tendem a aumentar na clínica odontológica, em função de uma maior longevidade de indivíduos que mantiveram a sua dentição natural, especialmente naqueles casos em que um desgaste dentário severo (DDS) tenha ocorrido em função de atrição, erosão, abrasão ou por combinações dessas. Objetivos: apresentar um apanhado das técnicas disponíveis para o uso de resinas compostas diretas (RCDs) aplicáveis na reabilitação de pacientes que tenham DDS, bem como descrever essas técnicas, discutindo suas vantagens e desvantagens. Revisão de literatura: uma busca na literatura previamente realizada apontou que as RCDs têm indicação para tratamentos conservadores em casos com DDS. Considerações finais: as técnicas diretas estão indicadas como uma alternativa para esse tipo de reabilitação porque apresentam longevidade aceitável, com um bom nível de satisfação por pa

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Effect of temperature on composite polymerization stress and degree of conversion

Cited by 53 publications

References 22 publications

Pre-heating of high-viscosity bulk-fill resin composites: Effects on shrinkage force and monomer conversion

Pre-heating of high-viscosity bulk-fill resin composites: Effects on shrinkage force and monomer conversion

Reduction of polymerization shrinkage in adhesive restaurations

Reabilitação oral do desgaste dentário severo com resina composta

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