Mechanical and hydrolytic degradation of an Ormocer®-based Bis-GMA-free resin composite

Klauer, Elena; Belli, Renan; Petschelt, Anselm; Lohbauer, Ulrich

doi:10.1007/s00784-018-2651-3

Cited by 30 publications

(27 citation statements)

References 62 publications

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“…This release of soluble substances has been reported in several studies [24][25][26][27] and is also stated by material manufacturers [18]. Despite these advantages, ormocer materials generally show lower mechanical properties compared to conventional dental composites [18,19,21].…”

Section: Introductionsupporting

confidence: 54%

“…In general, nano-hybrid ormocers show a relatively low polymerization shrinkage in combination with low polymerization stress [20]. Another positive characteristic of the nano-hybrid ormocer is the reduced leachability of residual monomers compared to conventional composites which is part of current research [21][22][23]. In the case of composites, an incomplete polymerization conversion occurs due to lowered diffusion of radicals by chain growth during polymerization.…”

Section: Introductionmentioning

confidence: 99%

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Antimicrobial agents in dental restorative materials: Effect on long‐term drug release and material properties

Berghaus¹,

Muxkopf

Feddersen

et al. 2021

European J Oral Sciences

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The present study reports on the long-term drug release and mechanical properties of bioactive dental filling materials based on chlorhexidine diacetate (CHX) or octinidine (di)hydrochloride (ODH) incorporated in a composite based on dimethacrylates or an ormocer. CHX or ODH were added to a nano-hybrid ormocer (O) and a nanohybrid composite (C) with the amount of 2 wt% to achieve four matrix-drug combinations: O-CHX, O-ODH, C-CHX, and C-ODH. Drug extraction and release were measured using high-performance liquid chromatography with diode-array detection (HPLC-DAD), while drug distribution was assessed by using energy dispersive X-ray spectroscopy (EDX). Drug release in water at 37˚C was observed over 87 d. To determine the material properties, the water absorption, water solubility, flexural strength and hardness were measured and compared to the reference materials. Persistent drug release over 87 d was observed for both ODH-based systems and both ormocer-systems, with the longest duration of activity seen for the O-ODH combination. Persistent drug release was achieved via the loosening of the polymer network indicated via decreasing polymerization enthalpies, enhanced water absorption, and water solubility. As a consequence, the flexural strengths of the materials were reduced. However, surface hardness was hardly reduced. ODH seems to be more adequate than CHX for the design of bioactive dental filling materials based on nanohybrid ormocer and composites.

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Section: Introductionsupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Antimicrobial agents in dental restorative materials: Effect on long‐term drug release and material properties

Berghaus¹,

Muxkopf

Feddersen

et al. 2021

European J Oral Sciences

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“…The significantly lower polymerization shrinkage registered by the ormocer-based composite ADF can be assigned to a network of inorganic-organic copolymers which is denser than conventional dimethacrylate monomers. Consequently, double bonds are less reachable and reduced conversion with high amount of unreacted double bonds may be expected [16,17]. Although this may contribute to the reduction of linear shrinkage and shrinkage force, other studies showed that this composite is more susceptible to mechanical degradation induced by water, which eventually translates in a reduction of its mechanical behavior when compared to conventional Bis-GMA-containing resin composites [17,33].…”

Section: Discussionmentioning

confidence: 99%

“…Until now, only one brand of this recent generation of pure Ormocer composite resin, marketed as Admira Fusion-Ormocer ® , is accessible. Scientific data is scarce concerning either in vitro or in vivo research [15,16,17]. Likewise, another restorative composite with diatomite fillers, marketed as Zirconfill ® , was recently introduced, but there is no available scientific research with proper validation.…”

Section: Introductionmentioning

confidence: 99%

Polymerization Shrinkage Evaluation of Restorative Resin-Based Composites Using Fiber Bragg Grating Sensors

et al. 2019

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The purpose of this study was to compare the linear polymerization shrinkage of different restorative resin-based composites (RBCs) using fiber Bragg grating (FBG) sensors. Five RBCs were evaluated: Zirconfill® (ZFL); Aura Bulk-Fill (ABF); Tetric® N-Ceram Bulk-Fill (TBF); FiltekTM Bulk-Fill (FBF); and Admira Fusion-Ormocer® (ADF). Ten samples per resin were produced in standardized custom-made half-gutter silicone molds. Two optical FBG sensors were used to assess temperature and polymerization shrinkage. Light curing was performed for 40 s and polymerization shrinkage was evaluated at 5, 10, 40, 60, 150, and 300 s. Statistical analysis was accomplished for normal distribution (Shapiro-Wilk, p > 0.05). Two-way repeated measures ANOVA with Greenhouse-Geisser correction followed by Bonferroni′s post-hoc test was used to analyze the linear shrinkage data (p < 0.05). ZFL showed the highest linear shrinkage and ADF the lowest. Shrinkage increased for all RBCs until 300 s, where significant differences were found between ADF and all other resins (p < 0.05). Among bulk-fill RBCs, TBF showed the lowest shrinkage value, but not statistically different from FBF. The ADF presented lower linear shrinkage than all other RBCs, and restorative bulk-fill composites exhibited an intermediate behavior.

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“… Abstract

Introduction The Bis-GMA, which is known to possess toxic properties to the human body, is part of the chemical structure of several direct dental restorative materials [ 1 ]. However, currently, there are composite resins on the market that are free of this monomer [ 2 ]. From the dental resin are released many other compounds [ 3 ].

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mentioning

confidence: 99%

Restorative materials without Bis-GMA – myth or reality?

et al. 2021

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View related articlesView Crossmark data percentage of 13%. Regarding the relation of the changes with the gender, age, DMFT index, and distribution by quadrants, did not show statistically significant differences (p > .05). Discussion and Conclusions: In this study, the prevalence of IA was higher than in other studies that revealed values of 0.3%, 0.5% and 0.27% [2-4], but close to Temilola et al. found 16.1% of cases of IA in a paediatric population in Nigeria [5]. There was no statistically significant relationship between DMFT and IA in the present study (p ! .05). Other studies have demonstrated a relationship between hyponeralization of the enamel and increased risk of caries [2,3]. The high prevalence of AI found in this study may be due to the fact that the majority of patients, with suspected rare alterations of the dental tissues, are frequently sent, to the consultation of the Egas Moniz Dental Clinic by family doctors, paediatrics and other dentists. When the dentist attends these cases, he must establish the diagnosis, inform the patient, and recommend the therapeutic approach that may have a multidisciplinary involvement.

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Mechanical and hydrolytic degradation of an Ormocer®-based Bis-GMA-free resin composite

Cited by 30 publications

References 62 publications

Antimicrobial agents in dental restorative materials: Effect on long‐term drug release and material properties

Antimicrobial agents in dental restorative materials: Effect on long‐term drug release and material properties

Polymerization Shrinkage Evaluation of Restorative Resin-Based Composites Using Fiber Bragg Grating Sensors

Restorative materials without Bis-GMA – myth or reality?

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