Polymerization shrinkage stresses in different restorative techniques for non-carious cervical lesions

Correia, Ayla Macyelle de Oliveira; Tribst, João Paulo Mendes; Matos, Felipe de Souza; Platt, Jeffrey A.; Caneppele, Taciana Marco Ferraz

doi:10.1016/j.jdent.2018.06.010

Cited by 48 publications

(39 citation statements)

References 39 publications

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“…A pre-tension was also applied with 30 N simulating the torque (Figure 5d) during the prosthetic screw tightening [42]. The composite resin shrinkage for sealing the screw access hole in the MC group was simulated simultaneously in the analysis using the thermal analogy [43]. The solutions were obtained in total deformation, von-Misses stress, maximum principal stress, and microstrain, for each group.…”

Section: Nonlinear Finite Element Analysismentioning

confidence: 99%

Survival Probability, Weibull Characteristics, Stress Distribution, and Fractographic Analysis of Polymer-Infiltrated Ceramic Network Restorations Cemented on a Chairside Titanium Base: An In Vitro and In Silico Study

et al. 2020

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Different techniques are available to manufacture polymer-infiltrated ceramic restorations cemented on a chairside titanium base. To compare the influence of these techniques in the mechanical response, 75 implant-supported crowns were divided in three groups: CME (crown cemented on a mesostructure), a two-piece prosthetic solution consisting of a crown and hybrid abutment; MC (monolithic crown), a one-piece prosthetic solution consisting of a crown; and MP (monolithic crown with perforation), a one-piece prosthetic solution consisting of a crown with a screw access hole. All specimens were stepwise fatigued (50 N in each 20,000 cycles until 1200 N and 350,000 cycles). The failed crowns were inspected under scanning electron microscopy. The finite element method was applied to analyze mechanical behavior under 300 N axial load. Log-Rank (p = 0.17) and Wilcoxon (p = 0.11) tests revealed similar survival probability at 300 and 900 N. Higher stress concentration was observed in the crowns’ emergence profiles. The MP and CME techniques showed similar survival and can be applied to manufacture an implant-supported crown. In all groups, the stress concentration associated with fractographic analysis suggests that the region of the emergence profile should always be evaluated due to the high prevalence of failures in this area.

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Section: Nonlinear Finite Element Analysismentioning

confidence: 99%

Survival Probability, Weibull Characteristics, Stress Distribution, and Fractographic Analysis of Polymer-Infiltrated Ceramic Network Restorations Cemented on a Chairside Titanium Base: An In Vitro and In Silico Study

et al. 2020

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“…The distribution of shrinkage stress and gap formation depends on an interplay between several factors, such as physical properties and structural features of resin composite, cavity and restorative procedure (Peutzfeldt and Asmussen, 2004;Braga et al, 2005;Bicalho et al, 2014;Han et al, 2016;Correia et al, 2018). In this investigation, the factors related to the cavity and the restorative procedure were to keep constant.…”

Section: Discussionmentioning

confidence: 99%

“…The polymerization shrinkage is an inherent characteristic of the resin composites (Braga et al, 2005;Rizzante et al, 2019), which depends on a number of factors including the material composition, the degree of conversion, the volume, and the elastic modulus (Braga et al, 2005;Braga et al, 2012;Benetti et al, 2014;Kim and Park, 2014;Van Dijken and Lindberg, 2015;Ferracane and Hilton, 2016;Han et al, 2019). The fact is that stress cannot be considered an isolated factor when it comes to the marginal adaptation of resin composite restorations; other factors, such as thermal changes and occlusal loads (Kim and Park, 2014;Van Dijken and Lindberg, 2015), placement of resin composite (Furness et al, 2014;Yoshimine et al, 2015;Correia et al, 2018;Alqudaihi et al, 2019), curing technique (dos Santos et al, 2007;Gamarra et al, 2018), cavity size and geometry (Braga et al, 2006;Borges et al, 2014;Han et al, 2016;Han et al, 2019) also may have a significant effect.…”

Section: Introductionmentioning

confidence: 99%

“…There are several reports on marginal gap formation and factors affecting its development (Versluis et al, 1996;Peutzfeldt and Asmussen, 2004;Braga et al, 2006;dos Santos et al, 2007;Furness et al, 2014;Benetti et al, 2015;Alqudaihi et al, 2019;Han et al, 2019). Different techniques and introducing of new polymeric systems have not been effective in eliminating the shrinkage stress and, thus, in reducing the gap formation (Versluis et al, 1996;Yoshimine et al, 2015;Correia et al, 2018;Gamarra et al, 2018;Han et al, 2019;Alqudaihi et al, 2019;He et al, 2019). However, studies suggest that marginal bevels can reduce or eliminate the microleakage and gaps associated with resin composite restorations (Opdam et al, 1998;Coelho-de-Souza et al, 2008;Coelho-de-Souza et al, 2010;Borges et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Influence of cavosurface angle on the stress concentration and gaps formation in class V resin composite restorations

Correia

Pereira

Bresciani

et al. 2019

Journal of the Mechanical Behavior of Biomedical Materials

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The study aimed to evaluate the influence of cavosurface angle on stress concentration and gap formation in class V restorations. Cylindrical cavities 3 mm in diameter were prepared in forty-five bovine incisors, changing only the angle of the bur in relation to the flat surface of the tooth. The cavities maintained the same volume (17.67 mm³). The samples were divided according to the cavosurface angle, into three groups (n=15): 90º, 120º, 135º. After adhesive application (Futurabond U, VOCO), the cavity was filled with bulk placement of a resin composite (GrandioSO, VOCO). The teeth were analyzed with stereomicroscopy. Data of marginal gap formation were statistically analyzed with a oneway analysis of variance (ANOVA) followed by Tukey tests (significance level: α=0.05).Finite element analysis (FEA) was used to study residual stress in these geometries and to correlate those stresses with experimentally measured gap formation. The elastic modulus and polymerization shrinkage were determined for FEA. Residual shrinkage stresses were expressed in maximum principal stress (MPS). There was a significant difference in the gap formation among the groups (p=0.001). A significantly lower marginal gap formation was found for 120° and 135° angles, with no significant difference between them. The cavosurface angle at 90º caused substantially higher stresses, in the restoration interface, with greater marginal gap. For the 120° and 135° angles, the stress concentrations were smaller and were located in the dental structure.The cavosurface angle influenced the marginal gap formation and stress concentration.

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“…Due to the low content of filler, liquid composite has a smaller modulus of elasticity by 20-30% and greater deformation capacity, compared to conventional composites. This contributes to reduction of polymerization shrinkage in the overlaying composite material (19).…”

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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Polymerization shrinkage stresses in different restorative techniques for non-carious cervical lesions

Abstract: The non-carious cervical lesions (NCCLs) restored with bulk fill composite have a more favorable biomechanical behavior.

Cited by 48 publications

References 39 publications

Survival Probability, Weibull Characteristics, Stress Distribution, and Fractographic Analysis of Polymer-Infiltrated Ceramic Network Restorations Cemented on a Chairside Titanium Base: An In Vitro and In Silico Study

Survival Probability, Weibull Characteristics, Stress Distribution, and Fractographic Analysis of Polymer-Infiltrated Ceramic Network Restorations Cemented on a Chairside Titanium Base: An In Vitro and In Silico Study

Influence of cavosurface angle on the stress concentration and gaps formation in class V resin composite restorations

Reduction of polymerization shrinkage in adhesive restaurations

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