Zinc oxide-eugenol cement

Zinc Oxide—Eugenol Cements. Zinc oxide—eugenol cements have many uses in dentistry. The admixture of powdered zinc oxide [1314-13-2] and Hquid eugenol [97-33-OJ, fotins a bland, easily mixed paste having exceUent working time but slow-setting characteristics. 

The compositions of zinc oxide—eugenol impression pastes are similar to those of the zinc oxide—eugenol cements (86). Variations in specific characteristics are achieved by the proportions of the ingredients (87). Properties vary in commercial products (88). The modifications of the zinc oxide—eugenol system intended for bite-registration pastes may include agents to increase the body or thixotropic character of the unset mix to improve... 

The Arrhenius definition is not suitable for AB cements for several reasons. It cannot be applied to zinc oxide eugenol cements, for these are non-aqueous, nor to the metal oxychloride and oxysulphate cements, where the acid component is not a protonic acid. Indeed, the theory is, strictly speaking, not applicable at all to AB cements where the base is not a water-soluble hydroxide but either an insoluble oxide or a silicate. 

Unlike other aqueous dental cements, the zinc polycarboxylate retains plastic characteristics even when aged and shows significant stress relaxation after four weeks (Paddon Wilson, 1976). It creeps under static load. Wilson Lewis (1980) found that the 24-hour creep value for one cement, under a load of 4-6 MPa, was 0-7 % in 24 hours, which was more than that of a zinc phosphate cement (0-13 %) and a glass-ionomer cement (0-32%), but far less than that of the zinc oxide eugenol cement (2-2%). 

These cements are the materials of choice for pulp capping (a wound dressing for covering an exposed or surgically treated pulp). They are superior to zinc oxide eugenol cements for this purpose (Mjor, 1963 Paterson, 1976). 

Batchelor, R. F. Wilson, A. D. (1969). Zinc oxide eugenol cements. I. The effect of atmospheric conditions on rheological properties. Journal of Dental... 

Civjan, S., Huget, E. F., Wolfhard, G. Waddell, L. S. (1972). Characteristics of zinc oxide eugenol cements reinforced with acrylic resin. Journal of Dental Research, 51, 107-14. 

El-Tahawi, H. M. Craig, R. G. (1971). Thermal analysis of zinc oxide-eugenol cement. Journal of Dental Research, 50, 430-5. 

Gilson, T. D. Myers, G. E. (1970). Clinical studies of dental cements. III. Seven zinc oxide eugenol cements used for temporarily cementing completed restorations. Journal of Dental Research, 49, 14-20. 

ISO. (1988). International Standard, ISO 3107. Dental zinc oxide/eugenol cements and zinc oxide non-eugenol cements. 

Messing, J. J. (1961). A polystyrene-fortified zinc oxide/eugenol cement. Investigation into its properties. British Dental Journal, 110, 95-100. 

Recall evaluation of restorations cemented with a zinc oxide-eugenol cement and a zinc phosphate. Journal of Dental Research, 55, 289-91. 

Wallace, D. A. Hansen, H. L. (1939). Zinc oxide eugenol cements. Journal of the American Dental Association, 26, 1536-40. 

As is described in Chapter 10, several different materials have been considered as sealants. These include zinc oxide-eugenol cements, epoxy resins and glass-ionomer cements [73,74]. In addition, calcium hydroxide paste has been used, though this material appears to be susceptible to leakage and may not be entirely satisfactory in forming a durable seal. However, its bioactivity is able to promote the physiological closure of the apex with dentine and cementum via stimulation of the odontoblast and cementoblast cells present [75]. 

In the case of deep caries, protect the pulpal floor with calcium hydroxide setting cement. Note zinc oxide-eugenol cement must not be used because it inhibits the polymerization reaction. 

The zinc oxide used in zinc oxide-eugenol cements is not the deactivated substance used in zinc phosphate cements [19]. Instead, it needs to be as reactive as possible, a state that is achieved by omitting the heat-treatment stage during manufacture [19], and ensuring that the particle size is as fine as possible [26]. 

A.D. Wilson, R.J. Mesley, Zinc oxide eugenol cements. III. Infrared spectroscopic studies, J. Dent. Res. 51 (1972) 1581-1588. 

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