A new kind of retarding polycarboxylate superplasticizer (M20S80) was prepared through the modification of black liquor and polycarboxylate superplasticizer (S) through an Fe-H2O2 reaction system. The synthesis process of M20S80 was introduced. Infrared spectrum analysis (FT-IR) was used to investigate the changes in functional groups in M20S80. At the same time, a mixture of LM20S80 was made b...

Synopsis: In terms of workability of cement based materials, ettringite formation is of major importance. Thus, the interaction between polycarboxylate-ether based superplasticizers (PCE) and various pure cement clinker and hydrate phases is investigated by means of rheological, adsorption and zeta potential measurements. Microstructural analysis of fresh pastes is carried out using cryo-micros...

STATEMENT OF PROBLEM Crowns cemented on short implant abutments may have insufficient retention. PURPOSE The purpose of this study was to evaluate the effect of circumferential grooves on the retention of cemented cast copings on implant abutments. MATERIAL AND METHODS Sixty similarly-shaped implant abutments were divided into 4 groups (n=15): without grooves, with 1 groove, with 2 grooves,...

Self-compacting concretes (SCC), a new type of concrete, were realized with the development polycarboxylate-based chemical additives. The interaction these additives powder materials in nano and micro scales affects fresh hardened properties concrete meso macro scales. To change improve macro-dimensional it is necessary to better analyze nano-micro-dimensional interaction. aim this study examin...

THE CHALLENGE OF GROSS MALOCCLUSIONS WITH THE BEGG TECHNIQUE Sakai . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 A LABORATORY INVESTIGATION OF THE BOND STRENGTHS OF SOME DENTAL CEMENTS. INCLUDING THREE ZINC POLYCARBOXYLATE CEMENTS .... M a n n i n g . . . . . . . . . . .... .... . . . . . . 94 ORTHODONTIC EDUCATION IN THE UNITED STATES Grewe. Freer and Little . . . . . . EDITORIAL ...

The aim of this study was to assess the uniaxial tensile strength after thermal cycling in replicas of CeraOne abutments (abutment and coping sets), using four types of cements (n = 10). A zinc phosphate cement (Fosfato de Zinco/ SSW), a resin-modified glass ionomer cement (RelyX luting / 3M-ESPE), a zinc oxide-eugenol cement (ZOE/ SSW) and a zinc oxide cement without eugenol (TempBond NE/ KERR...

abstract introduction. recently, the ariadent zinc phosphate cement has been introduced to market with low cost. some dentists purchase this product because of low cost and others avoid buying it because of unreliable quality. the two important properties of ideal dental cement are to have the minimum film thickness (less than 25 micron) and to have favorable compressive strength. the purpose o...

Film thickness, strength, solubility and microleakage of dental cements are essential factors in cement selection by dentist. Since failure of metal ceramic restorations is mostly due to their marginal leakage and provious studies have shown that microleakage of Resin, Glassionomer and Zincphosphate cements are different, this study was done to compare the rate of microleakage between Ariadent ...

The properties of graphene oxide (GO)-based cement paste can be significantly affected by the state of GO dispersion. In this study, the effects of uniformly dispersed and re-agglomerated GO on the rheological, mechanical properties and microstructure of cement paste were systematically investigated. Two distinct dispersion states can be achieved by altering the mixing sequence: Polycarboxylate...

background: with regard to potential retrievability of cement-retained implant restorations, the retentive strength of the luting agents is critical. the aim of this study was to evaluate the retention values of implant-supported metal copings using different luting agents. materials and methods: twenty iti implant analogs and solid abutments of 5.5-mm height were embedded vertically in autopol...