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Strength, hardness, corrosion evaluation and computer-aided designing of cobalt–-chromium molybdenum maxillary major connectors. (Part I)

Authors: Nadira A Hatim نادرة حاتم --- Ahmed A Al–Ali احمد العلي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2005 Volume: 17 Issue: 1 Pages: 24-29
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Rigidity is one of the main criteria for the major connector. This study was conducted to determine the effect of width and thickness on the rigidity of single palatal strap major connector using two cobalt–chromium molybdenum (Co–Cr–Mo) alloys, Remanium and Biosil cast by two different techniques, electrical induction–melting, and gas–oxygen torch melting on the transverse strength of maxillary major connectors.Materials and methods: Forty–eight specimens for transverse strength, twenty–four specimens for hardness, and twenty–four specimens for corrosion were prepared, examined by x–ray then tested by engineering test equipment, hardness tester, and sensitive electronic balance respectively. Ion release into saliva was tested by Atomic Absorption Spectrophotometer and chemical methods.Results: There was a statistically significant effect of each of the products, casting techniques, width (4&8)mm and thickness (0.4&0.6)mm on the transverse strength of Co–Cr–Mo single palatal strap major connector and statistically significant effect of each of products and casting techniques on hardness of Co–Cr–Mo alloy, but results of corrosion and ion release tests were insignificant.Conclusions: The major connector made from Remanium cast by induction technique produces stronger and harder specimens. The effect of thickness is more significant than the width, and there was no significant change in weight after 760 hours immersion in saliva.


Article
Strength, hardness, corrosion evaluation and computer-aided designing of cobalt–-chromium molybdenum maxillary major connectors: part II

Authors: Ahmed A Al–Ali احمد العلي --- Nadira A Hatim نادرة حاتم
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2005 Volume: 17 Issue: 2 Pages: 28-31
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Computers have been applied for information processing in medicine and dentistry. This study was to design a special computer program that helps the dentist to select, and design a proper maxillary major connector made of different types of materials with minimum dimensions and adequate mechanical properties.Materials and methods: A special computer program was performed to select suitable dimensions of maxillary major connectors. The computer program was performed according to two principles related to transverse strength and distortion of 48 specimens of maxillary major connector of two different dimensions (Width and thickness) and materials (cobalt–chromium molybdenum in addition to other type) were prepared and tested in part I.Results: The formulated program (Run) showed a correlation results with the manual tests through linear curves analysis of load-deflection of transverse strength, and the proportional limits of each design of major connectors in relation to their width, length, and thickness.Conclusion: This program is applicable to all types and materials of major connectors, and the major connector should be with the minimum dimensions possible but compatible with the rigidity.

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