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Showing 3 results for Zinc Phosphate
Assessment of physical and solubility & disintegration properties of zinc cements used for operative dentistry and the comparison with the standard
Mb.  tavakoli , R. Tabarak , A.  zargar ,
Volume 17, Issue 4 (1-2005)
Abstract
Statement of Problem: Zinc contained cements are so important among dental material as they have many indications and used in different ways therefore evaluation of their physical properties is so important in dentistry.
Purpose: The purpose of this research was to measure some physical properties of zinc-contained cements used in restorative dentistry. These cements included: Zinc oxide-eugenol, Zinc phosphate and Zinc polycarboxylate. Physical properties measured in this research were compressive strength, and setting time also Solubility & Disintegration were evaluated.
Materials and Methods: To perform this research two packs of each cement type were provided from an Iranian company products as prototypes and German HARVARD Dental GmbH company products as proof samples. For compressive strength 11 samples provided from any type of cement. For setting time test, 16 samples provided from Zinc oxide-eugenol and 11 samples from two other types. For solubility &
disintegration beet, 11 samples provided only from Zinc oxide-eugenol cement. The results compared with standard.
Results: The results of Iranian product showed that compressive strength of Zinc oxide-eugenol- is I2.58±3 MPa, of Zinc phosphate cement is 37.2I±5.0 MPa and of Zinc polycarboxylate cement is 35.86±2.1 MPa.Setting time of Zinc oxide-eugenol cement is 2 9.04 ±0.7 1 min, of Zinc phosphate cement is 5.41 ±0.55 min and of Zinc polycarboxylate cement is 2.5±0.6 min. Solubility & disintegration of Zinc oxide-eugenol cement is 8.44±i.l%. None of these findings are in standard limit.
Conclusion: By the use of standard charts it is concluded that: Only compressive strength of Zinc oxide-eugenol cement is between standard limits and compressive strengths of two other types of the cements are less than standard limits. Also only setting time -of Zincoxide eugenol cement is in standard limit and setting times of two other types of the cements aren't in standard limit. The German samples results were in standard limit. Solubility & disintegration-of Zinc-oxide eugenol cement isn't in standard limit. Therefore it is concluded that all types of these cements are not standard for use.
Effect of ultrasonic vibration time on the retention of prefabricated posts luted with two different cements
Dastnaei Peimaneh Hosseini , Dastgurdi Maziar Ebrahimi ,
Volume 27, Issue 4 (1-2015)
Abstract

  Background and Aims: In case of nonsurgical endodontic re-treatment or replacing a restoration, one of the best methods for removing post from the canal is using an ultrasonic vibration. The aim of this study was to evaluate the effect of ultrasonic vibration time on the retention of post luted with zinc phosphate or glass ionmer cements.

  Materials and Methods: 96 sound extracted lower premolars were selected. The coronal section of specimen was removed and the roots were endodontically treated. A 9-mm post space was prepared in each specimens and a stainless steel Parapost XP was cemented into the post space. Half of the specimens were cemented with the Zinc phosphate cement and the other by g lass ionomer cement. After 7 days of storage, both groups were equally divided into 4 subgroups of 12 teeth. Control group did not receive any treatment. The other subgroups subjected to ultrasonic vibration for 4, 8 or 12 minutes. The retention of all specimens was evaluated and data were analyzed using ANOVA and Tukey tests.

  Results: In control (no ultrasonic) group and 4 minute ultrasonic group, the retention of posts luted with Zinc phosphate cement were not significantly differen t from those luted with g lass ionomer cement. (P=0.372). On the other hand , applying of ultrasonic vibration for 8 and 12 minutes in zinc phosphate and 12 minutes in g lass ionomer caused a significant reduction in the retention of posts (P=0.01).

  Conclusion: Although, the initial retention of two cements was not different, the ultrasonic vibration had more catastrophic effect on zinc phosphate in comparison to glass ionomer.


Retention of dental custom cast posts using zinc phosphate cement: A Systematic Review of Literature
Marzieh Alikhasi, Amirreza Hendi,
Volume 30, Issue 4 (1-2018)
Abstract
Background and Aims: Loss of retention is one of the main reasons of failure in teeth restored with post and core. Several factors, including the type of cement can influence the retention of the posts. As zinc phosphate cement is considered as the standard for comparison this study performed to review articles evaluating the retention of cast posts cemented with zinc phosphate.
Materials and Methods: This systematic review was performed based on the PRISMA (Transparent Reporting of Systematic Reviews and Meta-analyses) guide. The question of this study was that how much is the amount of retention of cast posts cemented with zinc phosphate. Hence, a literature search was done in PubMed and Medline databases as well as Google scholar search engine using relevant keywords until 2016 limited to the English language. Articles were selected based on the inclusion and exclusion criteria, and were evaluated qualitatively.
Resultes: Internet search resulted in 1141 articles. Following the application of inclusion and exclusion criteria, 6 studies were included in this systematic review. The most common post material was nickel-chromium alloy. Retention of casting posts cemented by zinc phosphate was from 8.76 to 34.2 Kg and from 91 to 192.2 N.
Conclusion: Our review showed that the retention of cast posts cemented with zinc phosphate in controlled condition is moderate and factors including post material and length could influence the retention of the post.

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