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Abstract

(IN VITRO) EVALUATION IONIC RELEASE OF TWO TYPES OF DENTAL BASE CASTING ALLOYS (CO/CR), (NI/CR) IN DIFFERENT PH MEDIA, COMPARATIVE STUDY

Najwah Y. Hameed* and Assist. Prof. Mohammed A. Hamid*

ABSTRACT

Background: Corrosion is always accompanied by release of element. Release of metallic ion from the metallic- lattice of dental alloys into the oral cavity occurs. Chloride, sulfides, and oxides, are formed during this process, the release ion from dental alloy is considered to be gradual and to occur in small amounts.[1,2] The release of metallic ions from high noble, noble, and base dental casting alloys under differing PH condition which simulated the oral cavity.[3-5] Objective: Evaluate the release of ion from two commercial available dental casting base metal alloys cobalt-chromium (Co-Cr), nickel-chromium (Ni-Cr) in three different PH media. Material and method: Sixty disks shaped of (5mm) in diameter and (3mm) in thickness of base metal alloy samples participated in this study divided into two main groups according to the type of metal alloy; 30 samples made of (Co/Cr) alloy and 30 samples made of (Ni/Cr) alloy. Estimation the ion released from these alloys which are (Co, Ni, Cr and Mo) after immersion in artificial saliva of different PH levels (2.3, 6.5) & saline solution PH (7.3) for 30 and 60 days durations. The analytical technique used for elemental differentiation was done by the use of inductively coupled plasma atomic emission spectrophotometer (ICP-AES). Results: T-Test was used for statistical analysis of results. For all ions, PH and period interactions were statistically significant. ion release result were highest in artificial saliva of PH2.3 and didn't release anything in PH (6.5, 7.3). The major amount ions released within first 30 days. Mo in (Ni/Cr) alloys level is higher than (Co/Cr) alloys a statistically highly significant difference (P=0.00, P<0.01). Anon-significant difference (P=0.175, P>0.05) between Ni ion release and Co ion release. Non-significant difference (P=0.354, P>0.05), when compared between mean of total Ions realized from (Co/Cr) alloys level & (Ni/Cr) alloys.

Keywords: dental base casting alloy (Co/Cr) & (Ni/ Cr), Ion release, PH changes.


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