USP Grade. Made in the USA. Product Description. An acid-base reaction takes place with the formation of zinc eugenolate chelate. The reaction is catalysed by water and is accelerated by the presence of metal salts. ZOE can be used as a filling or cement material in dentistry.

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Occlusal enamel of 40 human molars was removed. Zinc oxide eugenol restoration was placed on the dentin surface and left for different times 24 h, 7 days or 45 days.

After 24 h, each tooth was longitudinally sectioned, to obtain bonded sticks that were tested under tension 0. Similarly, a decrease was observed for CS3 after storage for 24 h The results suggest that ZOE has negative effects on microtensile bond strength after 24 h..

Quarenta 40 molares usados neste estudo tiveram o esmalte removido. The use of provisional zinc oxide eugenol ZOE cement is common in prosthodontics, endodontics and restorative dentistry due to its desirable properties.

Therefore, application of a temporary material is essential to seal the cavity. On the other hand, cements containing eugenol may have potential negative effects on polymeric materials.

For instance, eugenol may reduce color stability, hardness, 2 degree of conversion, 3 bond strength to dentin 4—6 and adhesion of intraradicular post. The removal of provisional cement for placement of final restoration may leave remnants of the ZOE material on surface dentin. Contradictory literature reports exist on the influence of ZOE on bond strength of adhesive systems to dentin.

While some studies have reported that its use should be avoided due to observed reduction of bond strength, 3—5,10,17—19 other studies have observed no alteration with provisional restoration.

A factor that may explain the conflicting results is the adhesive system applied in the various studies: in comparison with earlier generations of milder adhesive systems, 20,23 the adhesive systems used currently all comprise a phosphoric acid etching step or a self-etching step. Another contributing factor is the variable time interval during which ZOE cement remains in contact with the dentin surface prior to resin restoration.

In several studies, the exposure time to ZOE has ranged from 24 h, 1,17,18 6 to 10 days 19,20,22,23 or 4 weeks, 14 making it difficult to make comparisons among studies and determine the actual real effect of ZOE on bond strength of dental adhesives. So, the null hypothesis to be tested is that exposure time of ZOE does not influence the bond strength value. Forty freshly extracted human third molars stored in 0. A flat and superficial dentin surface was exposed on each tooth after wet grinding occlusal enamel using grit SiC silicon carbide paper and wet polishing using grit SiC paper for 60 s to standardize the smear layer.

The cement was placed on the dentin surface, except in the control group, allowing 1 h for setting. The distilled water was changed every day. After the storage period, the ZOE was easily removed using a stainless steel spatula to avoid scaling the dentin. All specimens were then cleaned with a pumice-water slurry using a slow speed handpiece for 60 s, and rinsed with an air-water stream 60 s.

Composition and application mode of adhesive systems. The experimental unit in this study was the specimen tooth. Before subjecting the data to the appropriate statistical analysis, a Kolmogorov-Smirnov test was performed to assess whether the data followed a normal distribution.

Barlett's test for equality of variances was performed to determine if the assumption of equal variances was valid. Afterwards, data were subjected to two-way analysis of variance Adhesive vs. The cross-product Adhesive vs. Time of contact was statistically significant. The microtensile bond strength results of the present study confirmed that the negative influence on bonding to dentin caused by ZOE restoration is dependent on the time of permanence and the null hypothesis was rejected.

A large number of studies have evaluated the interaction of eugenol and residues of eugenol-containing cement with adhesive systems. The presence of water from both the oral medium and dentinal tubules may favor a reversible reaction capable of releasing eugenol from the zinc eugenolate matrix, which is incorporated into the subjacent dentin.

After maintaining ZOE restoration for 7 days, the microtensile bonding strength values for the SB2 adhesive system were re-established. This was probably due to the effect of phosphoric acid etching used in this system.

The SB2 adhesive requires dentin pre-treatment with acid, which removes the smear layer, exposing the collagen that will be infiltrated by the resin monomers to form the hybrid layer. Koch et al. In self-etch systems, etching occurs simultaneously with resin monomer infiltration and, therefore, the dentin smear layer is not removed.

Instead, it is incorporated into the hybrid layer. This has been confirmed by various studies demonstrating that ZOE does not affect bond strength of etch-and-rise adhesives if tests are performed within 7 days after initial application of ZOE. However, several studies have not observed any effect of eugenol on bond strength of self-etch adhesives after one week.

Findings from the current study are consistent with previous studies reporting that self-etch systems do not remove the smear layer, 25 but incorporate for the formation of a bond interface. For this reason, self-etch adhesive efficacy of bonding to the smear layer may be affected by the presence of contaminants, even 7 days after the presence of the ZOE restoration. The presence of ZOE residue on the dentin surface reduces bond strength, as well as decreases surface energy of dentin, which may reduce the wetting capability of the adhesive system on dental surface.

ZOE may act as a barrier, inhibiting interactions between acidic functional monomers and inorganic components of dentin. However, after 45 days, both the CS3 and SB2 adhesive showed no statistically significant differences compared to the control group. However, CS3 did not show the same pattern. The diffusion rate of eugenol is highest within the first 24 h, but decreases rapidly afterwards. Clinically, 7 days is a reasonable period for the replacement of temporary restorations when using etch-and-rise adhesives and 45 days for self-etch adhesives.

Pretreatment of dentin with ZOE affects resin-dentin bond strength of the two adhesive systems evaluated, particularly that of the self-etch approach. When ZOE was applied, it was necessary to wait 7 days before performing restorations with an etch-and-rinse adhesive, and 45 days for restorations with a self-etch adhesive. The authors declare that no experiments were performed on humans or animals for this investigation.

The authors declare that no patient data appear in this article. The author for correspondence must be in possession of this document.

The author has no conflicts of interest to declare. Indexed in: Scopus See more Follow us:. Discontinued publication For more information click here. Previous article Next article. Issue 2. Pages April - June Effect of exposure time of zinc oxide eugenol restoration on microtensile bond strength of adhesives to dentin.

Download PDF. Corresponding author. This item has received. Under a Creative Commons license. Article information. Table 1. Table 2. Show more Show less. Methods Occlusal enamel of 40 human molars was removed. Conclusion The results suggest that ZOE has negative effects on microtensile bond strength after 24 h. Introduction The use of provisional zinc oxide eugenol ZOE cement is common in prosthodontics, endodontics and restorative dentistry due to its desirable properties.

Materials and methods Forty freshly extracted human third molars stored in 0. Diagram of experimental design. He, D. Purton, M. A suitable base material for composite resin restorations: zinc oxide eugenol.

J Dent, 38 , pp. Lingard, E. Davies, J. Von Fraunhofer. The interaction between lining materials and composite resin restorative materials. J Oral Rehabil, 8 , pp. Bayindir, M. Akyil, Y. Effect of eugenol and non-eugenol containing temporary cement on permanent cement retention and microhardness of cured composite resin.

Dent Mater J, 22 , pp. Mayer, T. Pioch, H. Duschner, H. Dentinal adhesion and histomorphology of two dentinal bonding agents under the influence of eugenol.

Quintessence Int, 28 , pp. Millstein, D. Effects of temporary cementation on permanent cement retention to composite resin cores.



Acta odontol. ISSN The purpose of this research was to evaluate the clinical performace of two reinforced zinc oxide cements, manufactured in Venezuela using experimental formulas, an organic methyl methacrylate polymer without previous treatment of the powder and an organic polystyrene polymer with previous nitric acid treatment. This research was a randomized clinical trial, simple blind study. The control and experimental formulas were used in dental cavities of primary molars, distibuited among 50 schoolchildren of both sexes, and between 5 and 12 years old.


Correspondence to:. ABSTRACT : Anachoresis is the phenomenon through which blood-borne bacteria, dyes, pigments and other materials are attracted and fixed to circumscribed areas of inflammation. This study evaluated the occurrence of anachoresis in the periapical region of dogs submitted to root canal fillings. One hundred and four roots from four dogs were endodontically treated and root canals were filled with zinc-oxide-eugenol cement. Fifty percent were filled up to the dentinocemental junction and the others were overfilled. At days after root canal treatment, experimental bacteremia was induced by intravenous inoculation of CFU Streptococcus pyogenes.

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