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Article
In vitro study to compare the sealing ability of a hydroxyapatite endodontic sealer with other Sealers (Quantitative Measurement)

Authors: Raghad A MOHAMMED --- Majidah K AL-HASHIMI
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2001 Volume: 1 Issue: 3 Pages: S247-S256
Publisher: Mosul University جامعة الموصل

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Abstract

This study is designed to compare and evaluate the sealing ability of a new Iraqi hydroxyapatite-containing endodontic sealer and other sealers using spectrophotometric system as a quantitative measurement of the volume of dye penetration into root canals. Fifty single-rooted extracted human teeth were used.Step-back technique was used to flare and enlarge the canals, the teeth were divided into five groups according to the type of sealer used: Group I:Zincoxideeugenol cement sealer, Group II: ZOE + hydroxyapatite (Iraqi), Group III: Glass ionomer cement sealer, Group IV: GIC + hydroxyapatite (Iraqi), Group V: Calcium phosphate cement + zincoxide(Wach's cement).All groups were immersed in methylene blue dye for one week then dissolved in 50% nitric acid and filtered then centrifuged. The leakage was assessed quantitatively using a spectrophotometric system. The results showed that calcium phosphate cement + zincoxide,(Wach's cement) had the lowest mean of dye leakage, followed by glass ionomercement sealer, then glass ionomer cement Sealer + hydroxyapatite, while ZOE had the highest mean of dye penetration into the filled root canal, The newly developed Iraqi hydroxyapatite containing endodontic sealer was as effective as the other tested sealers concerning apical microleakage.


Article
The effect of the petroleum jelly on the hardness of Zinc Oxide Eugenol dental cement

Author: Dr. Bassam Afram Hanna . B. D. S., M. Sc. * د.بسام افرام
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2008 Volume: 5 Issue: 3 Pages: 266-269
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Dental cement is one of few materials which have been developed specifically for dental use, most of the other dental materials have been borrowed from other environment and then modified to meet the particular requirements of dentistry (1).The zinc oxide eugenol is one of the most dental cement that is used as a base material beneath metallic dental restoration and as an insulating temporary filling material and cement temporary crown, it is required to improve the physical properties of zinc oxide eugenol in order to be superior than other cement, notably in respect of its palliative effect on the pulp so the addition of additives such as O –ethexy benzoic acid (EBA) and polystyrene may increase the strength of ZOE cement (2,3,4,5,6,7), such additives may have a deleterious effects on the film thickness and solubility (8,3,9) .Zinc oxide are mixed with eugenol the mix sets to a hard cement , it is supplied as a powder and liquid or two pasts system, Simple mixed of these plain tow materials harden in the mouth in about 12 hours (1) but did nothave great strength when compared with other types of cements (11,12), An attempt to achieve a convenient setting time and strength of cement changing the ratio of base to accelerator has been advocate (6,7,13).So generally recognized or as a company suggestion to improve the handling and physical properties (hardness) of commonly used temporary ZOE cement by combining it with a mixture of semisolid saturated hydrocarbons lubricant of petroleum jelly (14).Aim of Study: Comparing (in-vitro) the hardness of Zinc Oxide Eugenol cement before and after adding different amount of Petroleum jelly.

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