Relationship between Color and Translucency of Multishaded Dental Composite Resins

The aim of the present study was to compare the translucency of different shades of two highly aesthetic multilayered restorative composite resins. In total nine shades from Esthet.X and ten shades from Filtek Supreme composite resins were chosen. Discs of each shade were prepared (N=3) and light-cured. Total and diffuse transmittance values for each sample were measured. Statistical analysis showed that the opaque dentine shades of both composites were the least translucent and the enamel shades had the highest translucency. There was a significant decrease in translucency from A2 to C2 of regular body shades and also from A4 to C4 of opaque dentine shades of Esthet.X composite resin. Grey enamel shade had a significantly higher diffuse translucency compared to clear and yellow enamel shades. There was a significant decrease in translucency from A2B to D2B and also in diffuse translucency from A4D to C6D shades of Filtek Supreme composite resin. It can be concluded that the color of the composite resins tested in this study had a significant effect on their translucency. Information on the translucency of different shades of composite resins can be very useful for the clinicians in achieving optimal esthetic restorative outcome.

Download Full-text

Wear Characteristics of Dental Ceramic CAD/CAM Materials Opposing Various Dental Composite Resins

Materials ◽

10.3390/ma12111839 ◽

2019 ◽

Vol 12 (11) ◽

pp. 1839 ◽

Cited By ~ 2

Author(s):

Bora Gwon ◽

Eun-Bin Bae ◽

Jin-Ju Lee ◽

Won-Tak Cho ◽

Hyun-Young Bae ◽

...

Keyword(s):

Weight Loss ◽

Composite Resin ◽

Lithium Disilicate ◽

Composite Resins ◽

Dental Composite ◽

Dental Ceramics ◽

Wear Properties ◽

Dental Ceramic ◽

Dental Composite Resins ◽

Cad Cam

The aim of this study was to evaluate the wear properties of opposed dental ceramic restorative CAD/CAM materials and several posterior direct restorative composite resins. Three kinds of dental ceramics CAD/CAM materials (monolithic zirconia, lithium disilicate, leucite) and four dental composite resins—that is, MI Gracefil, Gradia Direct P, Estelite Σ Quick, and Filtek Supreme Ultra—were used in this study. For each of the 12 groups (three ceramics × four composite resins), five each of a canine-shaped ceramic specimen and a cuboidal shape opposing composite resin were prepared. All of the specimens were tested in a thermomechanical loading machine (50 N, 100,000 cycles, 5/55 °C). Wear losses of ceramic specimens and composite resin specimens were evaluated using a three-dimensional profiling system and an electronic scale, respectively. Statistical analyses were performed using the Kruskal–Wallis test and Mann–Whitney U test with Bonferroni’s correction. Zirconia showed significantly less volumetric loss than lithium disilicate or leucite regardless of composite resin type (p > 0.05/3 = 0.017), and that Estelite Σ Quick showed significantly more weight loss than Filtek Supreme Ultra, MI Gracefil, or Gradia Direct P regardless of ceramic type (p > 0.05/6 = 0.083). Zirconia showed less volumetric loss than lithium disilicate or leucite. Some composite resins opposing ceramics showed considerable weight loss.

Download Full-text

Bisphenol A Release: Survey of the Composition of Dental Composite Resins

The Open Dentistry Journal ◽

10.2174/1874210601610010446 ◽

2016 ◽

Vol 10 (1) ◽

pp. 446-453 ◽

Cited By ~ 14

Author(s):

Elisabeth Dursun ◽

Hélène Fron-Chabouis ◽

Jean-Pierre Attal ◽

Anne Raskin

Keyword(s):

Bisphenol A ◽

Endocrine Disruptor ◽

Composite Resin ◽

Safety Data ◽

Composite Resins ◽

Dental Composite ◽

Potential Toxicity ◽

Dental Composite Resins ◽

Material Safety Data Sheets ◽

Exhaustive List

Background: Bisphenol A (BPA) is an endocrine disruptor with potential toxicity. Composite resins may not contain pure BPA, but its derivatives are widely used. Several studies found doses of BPA or its derivatives in saliva or urine of patients after composite resin placement. Objective: The aims of this study were to establish an exhaustive list of composite resins marketed in Europe and their composition, and to assess the extent of BPA derivatives used. Methods: A research on manufacturers' websites was performed to reference all composite resins marketed in Europe, then their composition was determined from both material safety data sheets and a standardized questionnaire sent to manufacturers. Manufacturers had to indicate whether their product contained the monomers listed, add other monomers if necessary, or indicate “not disclosed”. Results: 160 composite resins were identified from 31 manufacturers and 23 manufacturers (74.2%) responded to the survey. From the survey and websites, the composition of 130 composite resins (81.2%) was: 112 (86.2%) based on BPA derivatives, 97 (74.7%) on bis-GMA, 17 (13.1%) without monomer derived from BPA (UDMA, sometimes with TEGDMA) and 6 (4.6%) with UDMA (only); 1 (0.8%) did not contain a BPA derivative or UDMA or TEGDMA. Pure BPA was never reported. Conclusion: This work has established a list of 18 composite resins that contain no BPA derivative. Manufacturers should be required to report the exact composition of their products as it often remains unclear or incomplete.

Download Full-text

Effect of the Time of Salivary Contamination during Light Curing on Degree of Conversion and Microhardness of a Restorative Composite Resin

Biomimetics ◽

10.3390/biomimetics3030023 ◽

2018 ◽

Vol 3 (3) ◽

pp. 23 ◽

Cited By ~ 1

Author(s):

Rasoul Sahebalam ◽

Alireza Boruziniat ◽

Fahimeh Mohammadzadeh ◽

Abdolrasoul Rangrazi

Keyword(s):

Composite Resin ◽

Clinical Problem ◽

Human Saliva ◽

Point Of View ◽

Composite Resins ◽

Degree Of Conversion ◽

Dental Composite ◽

Dental Composite Resins ◽

Light Curing ◽

Saliva Contamination

Saliva contamination is a major clinical problem in restorative procedures. The purpose of this study was to evaluate the effect of the time of salivary contamination during light curing on the degree of conversion and the microhardness of a restorative composite resin. Eight groups of 10 samples for measuring the microhardness and eight groups of 5 samples for evaluating the degree of conversion were prepared. The samples of each group were contaminated with human saliva at a certain time. The first group (T0) was contaminated before light curing. The specimens in groups T2–T30 were contaminated at 2, 5, 10, 15, 20 and 30 s after the start of light curing, respectively. The samples of group T40 were contaminated after light curing. The degree of conversion and the microhardness of the specimens were measured by Fourier transform infrared (FTIR) spectroscopy and Vickers hardness testing techniques, respectively. The results of this study revealed that there were no significant differences between the groups in terms of the degree of conversion of the composite resin. Consistent with the findings for the degree of conversion, significant differences in the microhardness between the groups were not found. In conclusion, from a clinical point of view, the results of our study showed that the time of salivary contamination (before, during or after light curing of composite resin) has no significant effect on the polymerization (degree of conversion) and one of the important mechanical properties of dental composite resins (microhardness).

Download Full-text

Microhardness Investigation of Dental Composite Resins Exposed to Corrosive Environment

Materiale Plastice ◽

10.37358/mp.19.2.5202 ◽

2019 ◽

Vol 56 (2) ◽

pp. 434-439

Author(s):

Cristina-Angela Ghiorghe ◽

Vlad Carlescu ◽

Claudiu Topoliceanu ◽

Irina Nica ◽

Galina Pancu ◽

...

Keyword(s):

Composite Resin ◽

Artificial Saliva ◽

Study Groups ◽

Mean Value ◽

Composite Resins ◽

Dental Composite ◽

Corrosive Environment ◽

Corrosive Media ◽

Mean Values ◽

Dental Composite Resins

The aim of this study was to evaluate the microhardness Rockwell and Young s modulus of a new nano-hybrid and nano-fill composite resins exposed to corrosive media. The study was performed on two composite resins, one nano-hybrid and one nano-fill, enamel, dentine, translucent, respectively body shade, of which were made 20 samples (25.0 � 0.1 mm lengths, 10.0 � 0.1 mm widths and 3.0 � 0.1 mm thicknesses), which were immersed in mouthwash for 1 minute per day for 10 days, the rest of the time being stored in artificial saliva. Measurements of Rockwell microhardness and Young�s modulus on samples were made between on the first day, after 6 days and 10 days of immersion in mouthwash comparative with 0 day. The results showed that after immersion in the corrosive environment, both materials had the hardness values changed, but medium values of Rockwell microhardness to nano-fill composite resin were higher than nano-hybride. At the nano-hybride composite resin, it was observed that the enamel and clear translucent groups had the mean values increased after the first day of exposure to mouthwash, compared to the dentine group, which showed a higher mean value after 6 days. At the nano-fill composite resin, for the enamel and body groups were obtained the higher values of HRC after 10 days. For the dentine group, after 6 days, Filtek Ultimate showed the same variation as Harmonize dentine shade. Harmonize composite resin showed higher values of Rockwell microhardness and Young�s modulus for all study groups compared to Filtek Ultimate.

Download Full-text

Stiffness Increase During the Setting of Dental Composite Resins

Journal of Dental Research ◽

10.1177/00220345870660120301 ◽

1987 ◽

Vol 66 (12) ◽

pp. 1713-1716 ◽

Cited By ~ 45

Author(s):

M. Braem ◽

P. Lambrechts ◽

G. Vanherle ◽

C.L. Davidson

Keyword(s):

Composite Resin ◽

Composite Resins ◽

The Self ◽

Dental Composite ◽

Cross Linking ◽

Young’S Moduli ◽

Dental Composite Resins ◽

Initial Stage ◽

Rate Of Increase ◽

Mechanically Stabilized

Changes in the dynamic Young's modulus under flexure of self-cured and light-cured composite resins during setting were demonstrated to reflect accurately the condition of the curing composite resins. The rate of stiffness increase during setting varied considerably with the product, and the light-cured composite resins generally showed a faster rate of increase of stiffness. In the initial stage, the Young's moduli were very low, especially for the self-cured composite resins. This accounts for the damage (adhesion disruption and cross-linking interruption) that can be inflicted on a freshly placed composite resin filling that is not yet mechanically stabilized. Therefore, such fillings are vulnerable to aggressive distortion for at least 10 to 15 minutes after placement.

Download Full-text

Interactions Between Dental Composite Resins and Saliva A comparative biochemical in vitro study

Materiale Plastice ◽

10.37358/mp.19.3.5223 ◽

2019 ◽

Vol 56 (3) ◽

pp. 529-533

Author(s):

Mihaela Pantea ◽

Diana Andreea Ighigeanu ◽

Alexandra Totan ◽

Maria Greabu ◽

Daniela Miricescu ◽

...

Keyword(s):

Oxidative Stress ◽

In Vitro Study ◽

Composite Resins ◽

Vitro Study ◽

Dental Composite ◽

Gamma Glutamyl Transferase ◽

Specific Protocol ◽

Dental Composite Resins ◽

Glutamyl Transferase

This in vitro study analyses the biochemical interaction between saliva and three types of dental composite resins (a direct resin, an indirect resin and a dual-cure resin used for cementation of indirect dental restorations). The resin samples were obtained following a specific protocol and in line with the producers� recommendations; the resin samples were incubated with saliva samples collected from 19 healthy volunteers. The obtained results showed that the tested composite resins did not produce significant changes in oxidative stress parameters that were analysed (albumin, uric acid, GGT / gamma glutamyl transferase, OXSR-1 / oxidative stress responsive kinase 1) and do not influence the inflammatory salivary status reflected by the levels of IL-6 - an inflammatory marker.

Download Full-text