Microleakage of different types of temporary restorative materials used in endodontics.

Bacterial transformation and gene transfection can be understood as being the results of introducing specific genetic material into cells, resulting in gene expression, and adding a new genetic trait to the host cell. Many studies have been carried out to investigate different types of lipids and cationic polymers as promising nonviral vectors for DNA transfer. The present study aimed to carry out a systematic review on the use of biopolymeric materials as nonviral vectors. The methodology was carried out based on searches of scientific articles and applications for patents published or deposited from 2006 to 2020 in different databases for patents (EPO, USPTO, and INPI) and articles (Scopus, Web of Science, and Scielo). The results showed that there are some deposits of patents regarding the use of chitosan as a gene carrier. The 16 analyzed articles allowed us to infer that the use of biopolymers as nonviral vectors is limited due to the low diversity of biopolymers used for these purposes. It was also observed that the use of different materials as nonviral vectors is based on chemical structure modifications of the material, mainly by the addition of cationic groups. Thus, the use of biopolymers as nonviral vectors is still limited to only a few polysaccharide types, emphasizing the need for further studies involving the use of different biopolymers in processes of gene transfer.

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An in vitro Evaluation of Artificial Caries-like Lesions on Restored Overdenture Abutments

Journal of Dental Research ◽

10.1177/00220345880670031101 ◽

1988 ◽

Vol 67 (3) ◽

pp. 582-584 ◽

Cited By ~ 8

Author(s):

P.P. Kambhu ◽

R.L. Ettinger ◽

J.S. Wefel

Keyword(s):

Light Microscopy ◽

Polarized Light ◽

Polarized Light Microscopy ◽

The Other ◽

Type Ii ◽

Restorative Materials ◽

Abutment Teeth ◽

The Mean ◽

Materials Used

An acidified dialyzed gelatin gel system was used to determine the caries resistance of a variety of restorative materials used to obturate the canal orifice of overdenture abutment teeth. The restorative materials used were Tytin, Tytin + Copalite, P30 + Scotchbond, Fuji Ionomer-Type II, and Miracle Mix. Polarized light microscopy and microradiography were used to examine the caries-like lesions adjacent to the restorations. The lesions formed in the Fuji Ionomer-Type II and Miracle Mix groups appeared arrested at the wall adjacent to the restoration, and did not penetrate apically down the wall as did those associated with the other restorative materials. The mean depths of lesions adjacent to Fuji Ionomer-Type II and Miracle Mix restorations were significantly less than those of Tytin, Tytin + Copalite, or P30 + Scotchbond.

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The effect of optical brightening toothpaste on the color stability of esthetic restorative materials

International Dental Research ◽

10.5577/intdentres.2021.vol11.suppl1.13 ◽

2021 ◽

Vol 11 (Suppl. 1) ◽

pp. 81-85

Author(s):

Firdevs Kahvecioğlu ◽

Elçim Çoban ◽

Hayriye Esra Ülker

Keyword(s):

Color Change ◽

Calculated Data ◽

Color Stability ◽

Color Changes ◽

Significant Difference ◽

Restorative Materials ◽

Cherry Juice ◽

Native Speakers Of English ◽

Materials Used ◽

Post Hoc

Aim: The aim of this study is to evaluate the effects of whitening toothpaste applications on the color stability of different tooth-colored restorative materials (Fuji IX, GC Fuji II LC, Equia Forte, and Kerr Point 4) Methodology: Standardized fourty disc-shaped specimens were prepared from esthetic restorative materials and polished. The baseline color values of each specimen were then measured using a spectrophotometer, according to the Commission Internationale de l'Eclairage L*, a*, and b* (CIELAB) color scale. Ten specimens from each group were then immersed in two different beverages (cherry juice and coke) for seven days. After immersion, the color value of each specimen was re-measured. Each sample was brushed with whitening toothpaste for 30 seconds using an electric toothbrush. The samples were kept in distilled water at room temperature and brushing continued twice a day for seven days. The color change value, Delta E (ΔE), was calculated. Data were analyzed by two-way ANOVA and post hoc Tukey's test. Results: When the results were evaluated, after the colored samples had been brushed with whitening toothpaste, a difference was found between the Delta E values according to the materials used (p<0.001), but no difference was found in relation to the beverages (p>0.001). When the values of the color changes were evaluated after the first brushing with whitening toothpaste and before the specimens were colored with drinks, a difference was observed in the Fuji II cola, Fuji II cherry, and Equia Forte cola groups (p<0.05). When the values of the color changes were evaluated for specimens in which brushing had been done twice a day for seven days with whitening toothpaste and before they were colored with drinks, a significant difference was observed in the Fuji II cherry and Equia Forte cola groups (p<0.05). Conclusion: Using Signal White Now whitening toothpaste for 2 min 2 times a day for seven days caused significant changes in the color of the restorative materials. The color change is dependent upon the type of restorative material that is used. How to cite this article: Kahvecioğlu F, Çoban E, Ülker HE. The effect of optical brightening toothpaste on the color stability of esthetic restorative materials. Int Dent Res 2021;11(Suppl.1):80-4. https://doi.org/10.5577/intdentres.2021.vol11.suppl1.13 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

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Effect of Erosive pH Cycling on Different Restorative Materials and on Enamel Restored with These Materials

Operative Dentistry ◽

10.2341/07-77 ◽

2008 ◽

Vol 33 (2) ◽

pp. 203-208 ◽

Cited By ~ 33

Author(s):

L. F. Francisconi ◽

H. M. Honório ◽

D. Rios ◽

A. C. Magalhães ◽

M. A. A. M. Machado ◽

...

Keyword(s):

Clinical Relevance ◽

Restorative Material ◽

Tooth Erosion ◽

Different Types ◽

Restorative Materials ◽

Ph Cycling

Clinical Relevance The different types of restorative materials tested were not able to protect adjacent enamel from erosion. Thus, the ability of a restorative material to prevent tooth erosion should not be considered when choosing a material.

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Location Depending Textures of the Human Dental Enamel

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.160.281 ◽

2010 ◽

Vol 160 ◽

pp. 281-286 ◽

Cited By ~ 6

Author(s):

Lars Raue ◽

Helmut Klein

Keyword(s):

Mechanical Properties ◽

Lactic Acid ◽

Dental Enamel ◽

Polymeric Materials ◽

Incisor Tooth ◽

Worst Case ◽

Dental Fillings ◽

Anisotropic Mechanical Properties ◽

Different Types ◽

Materials Used

Dental enamel is the most highly mineralised and hardest biological tissue in human body [1]. Dental enamel is made of hydroxylapatite (HAP) - Ca5(PO4)3(OH), which is hexagonal (6/m). The lattice parameters are a = b = 0.9418 nm und c = 0.6875 nm [1]. Although HAP is a very hard mineral, it can be dissolved easily in a process which is known as enamel demineralization by lactic acid produced by bacteria. Also the direct consumption of acid (e.g. citric, lactic or phosphoric acid in soft drinks) can harm the dental enamel in a similar way. These processes can damage the dental enamel. It will be dissolved completely and a cavity occurs. The cavity must then be cleaned and filled. It exists a lot of dental fillings, like gold, amalgam, ceramics or polymeric materials. After filling other dangers can occur: The mechanical properties of the materials used to fill cavities can differ strongly from the ones of the dental enamel itself. In the worst case, the filling of a tooth can damage the enamel of the opposite tooth by chewing if the interaction of enamel and filling is not equivalent, so that the harder fillings can abrade the softer enamel of the healthy tooth at the opposite side. This could be avoided if the anisotropic mechanical properties of dental enamel would be known in detail, hence then another filling could be searched or fabricated as an equivalent opponent for the dental enamel with equal properties. To find such a material, one has to characterise the properties of dental enamel first in detail for the different types of teeth (incisor, canine, premolar and molar). This is here exemplary done for a human incisor tooth by texture analysis with the program MAUD from 2D synchrotron transmission images [2,3,4].

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