Physical properties and gap formation of light-cured composites with and without ‘softstart-polymerization’

Mehl, Albert; Hickel, Reinhard; Kunzelmann, Karl‐Heinz

doi:10.1016/s0300-5712(96)00044-9

Cited by 276 publications

(228 citation statements)

References 8 publications

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“…These curing modes could significantly reduce shrinkage stress during polymerization [84,85]. However, "soft-start" polymerization has not displayed any consistent effect on marginal integrity [86][87][88]. In addition, curing techniques involving very high light intensities, such as plasma arc curing (PAC) and xenon lamp curing, have been introduced to the market [89,90].…”

Section: The Effect Of Light Curing Modesmentioning

confidence: 99%

Challenges to the clinical placement and evaluation of adhesively-bonded, cervical composite restorations

Kubo

Yokota

et al. 2013

Dental Materials

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Objectives: The incidence of non-carious cervical lesions (NCCLs) has been increasing.The clinical performance of resin composites in NCCLS was previously unsatisfactory due to their non-retentive forms and margins lying on dentin. In order to address this problem, a lot of effort has been put into developing new dentin adhesives and restorative techniques. This article discusses these challenges and the criteria used for evaluating clinical performance as they relate to clinical studies, especially long-term clinical trials. Polymerization contraction, thermal changes and occlusal forces generate debonding stresses at adhesive interfaces.Methods: In laboratory studies, we have investigated how these stresses can be relieved by various restorative techniques and how bond strength and durability can be enhanced. Lesion forms, restorative techniques, adhesives (adhesive strategies, bond strengths, bond durability, and the relationship between enamel and dentin bond strengths) were found to have a complex relationship with microleakage. With regard to some restorative techniques, only several short-term clinical studies were available.

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Section: The Effect Of Light Curing Modesmentioning

confidence: 99%

Challenges to the clinical placement and evaluation of adhesively-bonded, cervical composite restorations

Kubo

Yokota

et al. 2013

Dental Materials

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“…La disminución de las propiedades de algunas resinas en agua tiene correlación directa con la absorción [19] y solubilidad en agua de las matrices (degradación hidrolítica) [20], [21]. Sankarapandian et al [22] investigaron el proceso de absorción de agua, su dureza y módulo de elasticidad de varios sistemas resinosos a base Bisgma y análogos, a los cuales se les sustituyó un grupo fenílico del carbón central de la cadena por fluorine, encontrándose que este reducía la absorción de agua en un 10%; además, se reportó que los polímeros fluorinados eran más estables en contacto con el agua, aunque la dureza disminuía y modificaba de manera considerable el módulo de elasticidad de los composites.…”

Section: Discussionunclassified

Efectos sobre microdureza y grado de conversión de dos tipos de resinas sometidas a tratamientos de pospolimerización

Lapesqueur¹,

Surriaga²,

Masache³

et al. 2015

Rev. nac. odontol.

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Objetivo:evaluar la microdureza y el grado de conversión después de diferentes técnicas poscurado en dos tipos de resinas compuestas. Materiales y métodos: se realizaron 36 cuerpos de prueba con 12 mm de diámetro y 4 mm de altura, con dos resinas: Filtek z350 y Ena Miscerium. Después de la confec-ción, los cuerpos de prueba se llevaron al microduremetro y a espectroscopia de infrarrojo, y fueron sometidos a cuatro procesos de pospolimerización: agua en ebullición, microonda, calor seco, autoclave y horno gradia. Resultados: se hizo análisis estadístico por medio de Anova de dos factores con postest Tukey por resina evaluada, se presentan media y desviación estándar, los valores de grado de conversión muestran un gran aumento en la resina Ena comparado con el grupo control (63,81%), cuando es realizado pospolimerización con calor seco (89,02%) y una gran disminución cuando es realizado con agua en ebullición (36,41%). Con-clusiones: el proceso de curado posterior por microondas y autoclave aumenta los valores de microdureza y grado de conversión, y el agua destilada a temperaturas altas disminuye la microdureza de la superficie de las resinas compuestas

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“…Afterwards, high light intensity is applied to complete the polymerization process and provide proper mechanical properties 10,25 . Since the volumetric contraction of the composite can cause debonding forces and a part of this stress can be compensated during the initial phase of polymerization by the flow of the dental composite 3,4 , the extending in time of the pre-gel phase with stepped irradiation can preserve the marginal integrity of the restoration 10,13,22,26 due to a reduction in the polymerization contraction stress 5,11,24 . The stepped irradiation mode used with incremental filling techniques to restore class I cavities provided bonding strength values similar to those of the control group.…”

Section: Discussionmentioning

confidence: 99%

“…Different filling and photo-activation techniques have been developed in an attempt to reduce the shrinkage potential and produce minimal interfacial stress development 2,18 . Soft-start polymerization or stepped light intensity uses an initial low-output intensity of light followed by a higher intensity of light 13,22 , and incremental insertion of composite resin reduces the volume of the restorative material that shrinks under photo-activation 8,12,17 . Both methods have been advocated because they minimize stress generated during polymerization and improve the marginal sealing and cavity wall adaptation of restorations 18 .…”

Section: Introductionmentioning

confidence: 99%

Effect of irradiation mode and filling technique on resin/dentin bonding strength in class I cavities

et al. 2004

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Factors such as light-curing mode, filling technique and cavity configuration may affect the bonding strength to dentin. This study evaluated the effect of irradiation mode and filling technique on resin/dentin bonding strength on the buccal wall of class I cavities in human teeth. Occlusal enamel was removed to expose a flat dentin surface. Occlusal cavities (4 x 3 x 3 mm) were prepared in dentin. The adhesive Single Bond was applied according to the manufacturer's instructions and TPH Spectrum composite resin was placed using the following: oblique incremental, horizontal incremental or bulk filling techniques. The composite resin was light-cured either by continuous (600 mW/cm² for 40 s) or Soft-Start (250 mW/cm² for 10 s + 600 mW/cm² for 30 s) modes. Specimens of the control group were obtained by bonding the material to the flat exposed buccal wall of the cavity (C-factor = 1). The teeth were stored in water at 37 o C for 24 h and prepared for microtensile testing. Bonded beams of approximately 0.8 mm² were obtained from the buccal wall and tested with a tension of 0.5 mm/min. Results were analyzed by two-way ANOVA, Tukey's test and Dunnett's test (α = 0.05). Incremental placement techniques with both irradiation modes produced higher bonding strength values than the bulk technique (p < 0.05). Bonding strength tested in the cavities had lower values than those obtained in flat dentin surfaces (control group) (p < 0.05), except for incremental fillings using stepped irradiation. Bonding strength to the cavity walls depends on the filling technique and on the irradiation mode of composite resins. DESCRIPTORS: Composite resins; Dentin; Dental cements; Dental enamel. RESUMO:Fatores como o modo de ativação, a técnica restauradora e a configuração cavitária podem afetar a resistência adesiva à dentina. Este estudo avaliou os efeitos dos modos de ativação e das técnicas restauradoras na resistência de união compósito/dentina na parede vestibular de restaurações classe I. O esmalte oclusal dos dentes foi removido para expor uma superfície dentinária planificada. Cavidades oclusais (4 x 3 x 3 mm) foram preparadas em dentina. O adesivo Single Bond foi aplicado de acordo com as instruções do fabricante, e o compósito TPH Spectrum, inserido através de três diferentes técnicas: oblíqua incremental, horizontal incremental ou incremento único. O compósito foi ativado utilizando o método contínuo (600 mW/cm² por 40 s) ou "Soft-Start" (250 mW/cm² por 10 s + 600 mW/cm² por 30 s). O grupo controle foi obtido pela união somente à parede vestibular planificada (fator C = 1). Os dentes foram armazenados por 24 h em água a 37 o C e preparados para o ensaio de microtração (0,5 mm/min). Os espécimes apresentaram na secção transversal uma área de união de aproximadamente 0,8 mm². Os resultados foram analisados pela ANOVA (dois fatores), pelos testes de Tukey e Dunnett (α = 0,05). A técnica incremental seguida da ativação com ambas as formas de fotopolimerização produziu maiores valores de resistência de união que a técnica...

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Physical properties and gap formation of light-cured composites with and without ‘softstart-polymerization’

Cited by 276 publications

References 8 publications

Challenges to the clinical placement and evaluation of adhesively-bonded, cervical composite restorations

Challenges to the clinical placement and evaluation of adhesively-bonded, cervical composite restorations

Efectos sobre microdureza y grado de conversión de dos tipos de resinas sometidas a tratamientos de pospolimerización

Effect of irradiation mode and filling technique on resin/dentin bonding strength in class I cavities

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