[논문]COMPARISON OF MECHANICAL PROPERTIES OF VARIOUS POST AND CORE MATERIALS

Ahn Seung-Geun; Sorensen John A.

COMPARISON OF MECHANICAL PROPERTIES OF VARIOUS POST AND CORE MATERIALS 원문보기

대한치과보철학회지 = The journal of Korean academy of prosthodontics, v.41 no.3, 2003년, pp.288 - 299

Ahn Seung-Geun (Department of Prosthodontics, Chonbuk National University) , Sorensen John A. (ODA Centennial Professor of Restorative Dentistry, Department of Prosthodontics, Oregon Health Sciences University, School of Dentistry)

Abstract ▼ AI-Helper

Statement of problem: Many kinds of post and core systems are in the market, but there are no clear selection criteria for them. Purpose: The purpose of this study was to compare the flexural strength and modulus of elasticity of core materials, and measure the bending strength of post systems made of a variety of materials. Material and Methods: The flexural strength and elastic modulus of thirteen kinds core buildup materials were measured on beams of specimens of $2.0{\times}2.0{\times}24{\pm}0.1mm$. Ten specimens per group were fabricated and loaded on an lnstron testing machine at a crosshead speed of 0.25mm/min. A test span of 20 mm was used. The failure loads were recorded and flexural strength calculated with the measured dimensions. The elastic modulus was calculated from the slopes of the linear portions of the stress-stram graphs. Also nine kinds commercially available prefabricated posts made of various materials with similar nominal diameters, approximately 1.25mm, were loaded in a three-point bend test until plastic deformation or failure occurred. Ten posts per group were tested and the obtained data were anaylzed with analysis of variance and compared with the Tukey multiple comparison tests. Results: Clearfil Photo Core and Luxacore had flexural strengths approaching amalgam, but its modulus of elasticity was only about 15% of that of amalgam. The strengths of the glass ionomer and resin modified glass ionomer were very low. The heat pressed glass ceramic core had a high elastic modulus but a relatively low flexural strength approximating that of the lower strength composite resin core materials. The stainless steel, zirconia and carbon fiber post exhibited high bending strengths. The glass fiber posts displayed strengths that were approximately half of the higher strength posts. Conclusion: When moderate amounts of coronal tooth structure are to be replaced by a post and core on an anterior tooth, a prefabricated post and high strength, high elastic modulus core may be suitable. CLINICAL IMPLICATIONS In this study several newly introduced post and core systems demonstrated satisfactory physical properties. However when the higher stress situation exists with only a minimal ferrule extension remaining a cast post and core or zirconia post and pressed core are desirable.

주제어

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가설 설정

1. Several of the composite resin core materials, Clearfil Photo Core and Luxacore had flexural strengths approaching amalgam.
3. The heat pressed glass ceramic core had a high elastic modulus but a relatively low flexural strength approximating that of the lower strength composite resin core materials.
4. The stainless steel, zirconia and carbon fiber post (C-Post) exhibited high bending strengths.
5. The glass fiber posts displayed bending strengths that were approximately half of the higher strength posts.

제안 방법

enough. Combining the disadvantages listed above and the flexural strength findings of the present study, for clinical practice it would rule out the use of glass ionomer, RMGI and the bottom half of the composite resins tested. Another consideration then is whether the low elastic modulus of even the strongest composite resin is acceptable.
45 performed an interesting in vitro comparison of fracture resistance of various types of post systems progressing through various simulated clinical stages. They evaluated posts only, posts alone bonded into teeth, posts bonded into teeth with core buildup, and post and core buildup and full crown. For the first two stages, the titanium post was significantly stronger than the other post systems.

대상 데이터

A variety of core materials such as amalgam, composite resins with different polymerization modes, glass ionomer, glass cermet, resin modified glass ionomer (RMGI) and ceramic were tested (Table I). The flexural strength and elastic modulus were measured on beams of specimens of 2.

데이터처리

The elastic modulus was calculated from the slopes of the linear portions of the stress-strain graphs. Data were analyzed with analysis of variance and Tukey multiple range comparison tests.

성능/효과

2. Despite that these composite resins had strengths of about 90% of amalgam, the modulus of 이 asticity of these same materials was only about 15% of that of amalgam.
Only the glass fiber post was consistently weaker throughout all four stages of the study. The most important finding of this study was that placement of a crown with a 1 mm ferrule distributed the stresses so as to render even the weakest post system not significantly different from three of the other post systems. This confirms earlier work by Hoag and Dwyer52 and Gelfand et al.

후속연구

Further research is needed to ascertain whether a high or low elastic modulus post and core better distribute occlusal forces to the remaining tooth structure and extend clinical longevity. Cyclic fatigue tests appear to be the standard for measuring and predicting clinical performance in the adversarial oral environment.
This may preclude the use of many of the large diameter esthetic prefabricated post systems. Further research is needed to discern the relative importance of strength versus elastic modulus of core materials as well as post materials to clinical longevity.

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