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Displaying 76 - 100 of 108

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

April 1, 2002
Author(s)
Laurence C. Chow, Shozo Takagi, Stanislav 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

Crystal Structures of Calcium Orthophosphates

December 1, 2001
Author(s)
M Mathew, Shozo Takagi
Calcium phosphates comprise the largest group of biominerals in vertebrate animals. They also have many uses in industry, medicine and everyday life. Orthophosphates are salts of the tribasic phosphoric acid which include H 2PO 4-, HPO 4 2- and PO 4 3-

Structures of Biological Minerals in Dental Research

December 1, 2001
Author(s)
M Mathew, Shozo Takagi
Structural features of some calcium phosphates of biological interest are described. Structure of hydroxyapatite (OHAp), considered as the prototype for the inorganic component of bones and teeth is discussed with respect to the kinds and locations of

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

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

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