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Displaying 51 - 75 of 76

Remineralization Effect of a Low-Concentration Fluoride Rinse in an Intraoral Model

April 1, 2002
Author(s)
Laurence C. Chow, Shozo Takagi, Stanislav A. Frukhtbeyn, B A. Sieck, Edward E. Parry, N S. Liao, Gary E. Schumacher, Milenko Markovic
A previous study showed that a sodium hexafluorosilicate-calcium chloride-based two-solution fluoride (F) rinse containing 6 mmol/l of F was more effective than a 12 mmol/l F sodium fluoride rinse in depositing F on tooth surfaces and increasing oral F

Processing and Properties of Strong and Non-Rigid Calcium Phosphate Cement

January 1, 2002
Author(s)
Hockin D. Xu, Janet Quinn, Shozo Takagi, Laurence C. Chow
A calcium phosphate cement (CPC) sets to hydroxyapatite and has been used in dental and craniofacial applications. However, when CPC was used in periodontal repair, tooth mobility resulted in the fracture and exfoliation of the rigid and brittle implants

Amorphous Calcium Phosphate

November 1, 2001
Author(s)
Laurence C. Chow, E D. Eanes
Amorphous structures represent about 20% of the 60 or so different mineral types formed by the action of living organisms. Among these biogenic amorphous minerals, those that are composed principally of calcium and phosphate are most abundant in the teeth

In Vitro Evaluation of a Calcium Phosphate Cement Root Canal Filler/Sealer

October 1, 2001
Author(s)
Ai-Shuan(Maria) Cherng, Laurence C. Chow, Shozo Takagi
An in vitro dye leakage study was performed to compare the apical leakage of of a fill with injectable calcium phosphate cement (CPC) filler/sealer and a master silver cone with leakage from a fill of Sealapex sealer and laterally condensed gutta-percha

Formation of Macropores in Calcium Phosphate Cement Implants

February 1, 2001
Author(s)
Shozo Takagi, Laurence C. Chow
A calcium phosphate cement (CPC) was shown to harden at ambient temperatures and form hydroxyapatite as the only end-product. Animal study results showed showed that CPC resorbed slowly and was replaced by new bone. For some clinical applications, it would

Morphological and Phase Characterizations of Retrieved Calcium Phosphate Cement Implants

February 1, 2001
Author(s)
Shozo Takagi, Laurence C. Chow, Milenko Markovic, C D. Friedman, P D. Costantino
A self-hardening calcium phosphate cement (CPC), consisting of equimolar amounts of tetracalcium phosphate and dicalcium phosphate anhydrous, hardens when mixed with water and forms a resorbable hydroxyapatite (HA) as the end- product. The objective of

Solubility of Calcium Phosphates

February 1, 2001
Author(s)
Laurence C. Chow
Solubility is one of the most important properties of calcium phosphate salts. It is the solubility that determines the direction of many reactions that involve calcium phosphates such as dissolution, precipitation, hydrolysis, and phase transformation

NIST Centennial Celebration - Crystallographic Highlights

December 1, 2000
Author(s)
Winnie K. Wong-Ng, Alan D. Mighell, Gabrielle G. Long, Leonid A. Bendersky, Vicky L. Karen, J D. Barnes, G L. Gilliland, T Gallagher, Terrell A. Vanderah, R G. Munro, Paul E. Stutzman, H F. McMurdie, S Block, Gasper J. Piermarini, Robert S. Roth, Antonio Santoro, Curt W. Reimann, C R. Hubbard, John W. Cahn, E Prince, D R. Lide, H Ondik, Lawrence P. Cook, T Siegrist, G DeTitta, L Finger, H Evans, E Gabe, G Enright, J T. Armstrong, M Levenson, Laurence C. Chow, Shozo Takagi, M Mathew, Jeffrey W. Lynn, H S. Peiser
NIST has a long history of crystallographic research, and has made significant contributions to the advancement of the fields of crystallography, biology, and materials science. The articles are contributed by scientists from various divisions at NIST, and

Calcium Phosphate Cements: Chemistry, Properties, and Applications

August 1, 2000
Author(s)
Laurence C. Chow
This paper reviews recent studies on self-setting calcium phosphate cements (CPC). Discussions are focused on the cement setting reactions, the products formed, those properties of the cements that contribute to their clinical efficacy, and areas of future

Composition of Plaque and Saliva Following Use of an A-tricalcium Phosphate-Containing Chewing Gum and a Subsequent Sucrose Challenge

January 1, 2000
Author(s)
Gerald L. Vogel, Z Zhang, Clifton M. Carey, A K. Ly, Laurence C. Chow, H M. Proskin
Previous studies demonstrated that chewing of a 2.5% (mass fraction) α-tricalcium phosphate-fortified (a-TCP) experimental chewing gum released sufficient calcium and phosphate to eliminate any fall in the tooth mineral saturation of plaque fluid after a

Remineralization Effects of A Two-Solution Fluoride Mouthrinse: An in situ Study

October 1, 1999
Author(s)
Laurence C. Chow, Shozo Takagi, Clifton M. Carey, B A. Sieck
Results from previous studies showed that a two-component fluoride (F) rinse is significantly more effective than a NaF rinse of the same F content 250 g/g (ppm) in remineralizing enamel and root lesions in an in vitro cyclic de- and remineralization model

Effect of Powder Grinding on Hydroxyapatite Formation in a Polymeric Calcium Phosphate Cement Prepared from Tetracalcium Phosphate and Poly[Methyl Vinyl Ether-Maleic Acid]

November 1, 1998
Author(s)
Y Matsuya, S Matsuya, Joseph M. Antonucci, S. Takagi, Laurence Chow, A Akamine
The primary aim of this study was to determine if cement based on poly(methyl vinyl ether-maleic acid) (PMVE-Ma) and tetracalcium phosphate (TTCP) resulted in hydroxyapatite (OHAp) formation. In addition, the mechanical strength of this type of polymeric