Publications by authors named "Chiharu Kawamoto"
Background: This study aimed to evaluate the color-matching and light transmission properties of a newly developed aesthetic flowable resin composite, OCFB-001.
Methods: Rubber molds containing cylindrical cavities were filled with Estelite Sigma Quick, and 40 resin composite (CR) molds with simulated Class I cavities were prepared in shades A1, A2, A3, and A4, resulting in a total of 160 samples. Following bonding procedures, four different flowable resin composites ( = 10) were introduced into the cavities.
This in vitro study aimed to investigate whether color differences in the stained cavity floor simulating recurrent caries can be detected using various restored resin composites. Artificial teeth were made with conventional resin composite (Estellite Sigma Quick A3; ET), and class V cavities were prepared. To simulate the color of caries, a dot was marked in the center of the cavity floor using four different magic pens.
View Article and Find Full Text PDFBackground: This study aimed to evaluate the color matching, light transmittance, and reflectance characteristics of the novel flowable resin composite OCF-001 (OCF).
Methods: Fifty-four resin composite molds were made with simulated class I cavities of A2, A3, and A4 shades by filling the rubber mold interspace with Estelite Sigma Quick (ESQ), Gracefil Putty (GP) and Filtek Supremme Ultra (FSU). After applying the adhesive, three different flowable resin composites ( = 6), OCF, Gracefil LoFlo (GLF), and Supreme Ultra Flowable (SUF), were used to fill the cavities.
This study evaluated the effect of topical fluoride application on enamel hardness after in-office bleaching. Twelve human incisors were cut along the long axis, resulting in 24 halves used in four treatment groups (n = 6 in each group): (i) untreated group (C); (ii) in-office bleaching material (B); (iii) treatment with surface reaction-type prereacted glass-ionomer varnish after in-office bleaching (B+PRG); and (iv) treatment with acidulated phosphate fluoride solution after bleaching (B+F). All specimens were subjected to pH-cycling for 4 wk.
View Article and Find Full Text PDFArticle Synopsis
- The study examined how fluoride-containing resin composites and bonding agents affect the progression of artificial caries using a pH-cycling model that mimicked demineralizing and remineralizing conditions.
- It involved four combinations of bonding agents and composites placed in cavities on extracted teeth, with half experiencing daily fluoride application.
- Results showed that fluoride treatment decreased lesion depth, particularly with the fluoride-containing combinations at the 12-week mark, indicating that these combinations are most effective in preventing artificial caries progression.
Article Synopsis
- The study aimed to compare the microtensile bond strength (MTBS) of two all-in-one adhesive systems and an experimental two-step self-etching system on two types of bur-cut dentin surfaces.
- Eight extracted human premolars were bonded using Xeno CF Bond (Xeno), Prompt L-Pop (PL), or the experimental ABF adhesive, followed by microtensile testing to assess bonding strength.
- Results showed that Xeno and PL had lower bond strength on dentin cut with regular-grit burs, while the experimental adhesive maintained consistent strength across both bur types, indicating a potential advantage due to its formulation.
Effect of sphered particles on the firing contraction of porcelain inlay processed by cold isostatic pressing.
J Biomed Mater Res B Appl Biomater
August 2003
Article Synopsis
- The study examined how spherical particles affected the contraction ratio of porcelain inlays made using the cold isostatic pressure (CIP) method.
- Spherical particles were created by crushing conventional porcelain powder and combining it with different binders, which led to a notable decrease in firing contraction from 7% to about 1% compared to traditional lathe-cut particles.
- Although the strength and density of the porcelain discs were lower than the control group, their Vickers hardness remained consistent, indicating that using sphered particles in the CIP process can streamline production while reducing contraction during sintering.
The purpose of this study was to evaluate the effect of dentin depth and tubule direction on the ultimate tensile strength (UTS) of human dentin. Dentin slabs of 0.5-mm thickness were trimmed either from the mesial and distal (for specimens with the tubules parallel to the tensile force; parallel group) or from the occlusal and pulpal surfaces (perpendicular group) to reduce the cross-sectional area of the superficial, middle, and deep regions to 0.
View Article and Find Full Text PDFPurpose: The objective of this work was to evaluate the in vivo long-term durability of bond strength and morphological appearance of interfaces between dentin and two adhesive systems.
Materials And Methods: Class V cavities were prepared on the facial surfaces of 6 intact teeth of a monkey, and restored with Unifil Bond/Unifil F and Fuji Bond LC/Clearfil AP-X. One year later, 10 other teeth were restored with the same materials and the monkey was sacrificed after 24 hours.