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Assessment of the compressive strength of the metal-ceramic connections in fixed dental restorations

Malara P., Paluch K., Sobolewska K., Pasieka A.

Journal of Achievements in Materials and Manufacturing Engineering

2016

Vol. 79, nr 2

66--73

Purpose: The purpose of the work was to evaluate the compressive strength of metalceramic connections in the fixed dental restorations. Design/methodology/approach: Restorations were made on a model of the natural patient's dentition which was developed specifically for this study. The study included 10 metal - porcelain crowns, for each group of teeth. Their production used Remanium 2000+ alloy and porcelain Vita VMK Master. A static compression test was carried out on the final crowns and Vicker's hardness test was performed. Visual observations were carried out on a scanning electron microscope. Findings: On the basis of the research and the discussion it was possible to conclude that metal-porcelain crowns have a greater compressive strength than natural human teeth. Thus, they are more resistant to occlusal forces and the crowns for the first molars are the strongest restorations. Practical implications: The metal-porcelain crowns are a very good option for teeth restoration and they can be used even in the areas of the mouth where the occlusal forces reach the maximum values. Originality/value: The article focuses on testing of compressive strength of metal-ceramic crowns. The comparison with natural human occlusal forces shows the sufficient mechanical properties of metal-ceramic crowns for application in humans. The artificial tooth geometry allows applying prosthetic crowns in the patient's mouth without the risk of ceramic break down.

Ocena szczelności koron protetycznych w zależności od technologii ich wykonania

Ryniewicz W., Ryniewicz A. M., Bojko Ł.

Przegląd Elektrotechniczny

2015

R. 91, nr 5

45-48

Celem opracowania była ocena in vitro szczelności koron ze stopu Co-Cr-Mo na zęby przedtrzonowe i trzonowe wykonanych w trzech technologiach: odlewania, frezowania i stapiania laserowego. Dla porównania dopasowania koron do filarów protetycznych stanowiących modele referencyjne wykorzystano skanowanie światłem strukturalnym i modelowanie w programie Geomagic Qualify 12. Badania pozwoliły stwierdzić, że szczelność koron protetycznych wykonanych w badanych technologiach jest porównywalna i spełnia wymogi kliniczne.

The aim of the study was to assess the in vitro tightness crown alloy Co-Cr-Mo on the premolars and molars made in three technologies: casting, milling and laser melting. For comparison fitting crowns to the pillars of prosthetic on which the reference models used structured light scanning and modeling in the Geomagic Qualify 12. The study revealed that the tightness of the prosthetic crowns made in the tested technologies is comparable and meets the requirements of the clinical.