Effects of photopolymerisation on genotoxicity of composite adhesives in the comet assay

Dačić, Stefan; Djelic, Ninoslav; Radakovic, Milena; Lakic, Nada; Veselinović, Aleksandar M.; Ristanić, Marko; Andjelković, Marko

doi:10.2298/gensr1602617d

Cited by 2 publications

(3 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This residual monomer contributes to poor mechanical properties of the composite filling. It can also diffuse into the pulp chamber directly through dentin tubes and cause genotoxic and cytotoxic effects on the pulp cells (24). Therefore,it is very important to know the minimum light intensity required for achieving a satisfying degree of conversion and ensuring optimal mechanical properties of the composite filling.…”

Section: S E L E C T I O N Of T H E L I G Ht C U R I N G P R O T O C O Lmentioning

confidence: 99%

Reduction of polymerization shrinkage in adhesive restaurations

Dačić¹,

Miljković²,

Mitić³

et al. 2019

Acta fac medic Naissensis

View full text Add to dashboard Cite

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...

show abstract

Section: S E L E C T I O N Of T H E L I G Ht C U R I N G P R O T O C O Lmentioning

confidence: 99%

Reduction of polymerization shrinkage in adhesive restaurations

Dačić¹,

Miljković²,

Mitić³

et al. 2019

Acta fac medic Naissensis

View full text Add to dashboard Cite

show abstract

“…This residual monomer can reduce the mechanical properties of the final restoration and transition into the pulp via dentin tubules, causing genotoxic and cytotoxic effects. 7 The topic of modified light-curing is not new to dentistry. Over the years, different curing methods have been proposed to prevent significant development of polymerization contraction and promote higher bond strength.…”

Section: Introductionmentioning

confidence: 99%

“…This residual monomer can reduce the mechanical properties of the final restoration and transition into the pulp via dentin tubules, causing genotoxic and cytotoxic effects. 7…”

Section: Introductionmentioning

confidence: 99%

Shear bond strength and failure modes of composite to dentin under different light-curing conditions

Miljković

Dačić

Mitić

et al. 2022

Polymers and Polymer Composites

Self Cite

View full text Add to dashboard Cite

This study aimed to examine the effects of different light-curing modes on the immediate shear bond strength (SBS) of different composite resin types to dentin using universal adhesive. Human teeth were extracted and sectioned to obtain flat dentin slices. The universal adhesive was applied in total-etch mode. Conventional and bulkfill composites were used to create cylindric build-ups. Full power and Ramp mode were used to light-cure the adhesive and composite resin. SBS test was performed in a universal testing machine, and failure modes were determined via scanning electron microscopy (SEM). Two-way ANOVA and Student t-test were used to analyze statistical data. Significantly higher SBS was obtained when bulkfill composite was used compared to the conventional one ( p < .001). The difference between Full power and Ramp curing mode was insignificant ( p = .4). Mixed failure was the predominant type. Low SBS resulted in adhesive failure, while high SBS resulted in cohesive failure. Shear bond strength was not curing-dependent but rather material-dependent. Ramped curing does not contribute to higher bond strength. Bulkfill composite seems to be more favourable in terms of bond strength.

show abstract

Effects of photopolymerisation on genotoxicity of composite adhesives in the comet assay

Cited by 2 publications

References 15 publications

Reduction of polymerization shrinkage in adhesive restaurations

Reduction of polymerization shrinkage in adhesive restaurations

Shear bond strength and failure modes of composite to dentin under different light-curing conditions

Contact Info

Product

Resources

About