[논문]THE EFFECTS OF SPURE AND INVENTS ON THE CASTING ACCURACY AND POROSITY OF TI-NI CASTINGS

Cho Lee-Ra; Yi Yang-Jin; Park Chan-Jin

THE EFFECTS OF SPURE AND INVENTS ON THE CASTING ACCURACY AND POROSITY OF TI-NI CASTINGS 원문보기

대한치과보철학회지 = The journal of Korean academy of prosthodontics, v.41 no.3, 2003년, pp.342 - 350

Cho Lee-Ra (Research Institute of Oral Science, College of Dentistry, Kangnung National University) , Yi Yang-Jin (Research Institute of Oral Science, College of Dentistry, Kangnung National University) , Park Chan-Jin (Research Institute of Oral Science, College of Dentistry, Kangnung National University)

Abstract ▼ AI-Helper

Statement of problem. Titanium-Nickel alloy might be used in various prosthetic restorations since it has a unique property such as super-elasticity and high fatigue resistance. However, little is known about the casting ability of this alloy. Purpose. This in vitro study compared the casting accuracy and the porosity made with different investments and various sprue designs to ascertain what casting condition would be better for the fabrication of Ti-Ni cast restorations. Material and methods. A total of 70 Ti-Ni alloy crowns were made and divided into 7 groups of 10 copings on a metal master die. For measuring the effect of the sprue numbers, two groups with one and two 8-gauge sprues were compared. Moreover, the results of the conventional sprue and the double thickness sprues were compared. Three investments were used; carbon free phosphate bonded investment, titanium investment and gypsum bonded investment. The cast restorations were evaluated at 48 points on the entire circumferential margin with a stereomicroscope measuring in micrometers. Each crown was radiographically examined for casting defects and porosity. Data on casting accuracy were analyzed using two-way and Post hoc Scheffe's comparison to determine whether significant differences existed at the 95% confidence level. Student-Newman-Keuls test were performed to identify significant differences in the number of voids. Results. The double sprueing group and double thickness group had significantly less marginal discrepancy than the single sprueing group (P<.05 and P<.01, respectively). The castings with phosphate bonded investment showed the least marginal discrepancy and the smoothest surface. The castings invested in the gypsum bonded investment had the greatest gaps in margin and the largest failure rate. The double sprueing group and phosphate bonded investment group had significantly smaller void numbers and smaller void size than the other groups. Conclusion. Within the limitations of this in vitro study, the casting accuracy of the groups using thicker, double sprue design and the phosphate bonded investment was significantly superior. Moreover, void number and size were less than other groups.

주제어

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가설 설정

1. The double sprue and double thickness group had significantly less marginal discrepancy than the single sprue group.
2. The castings with phosphate bonded investment showed the least marginal discrepancy the smoothest surface.

제안 방법

The internal porosity of all specimens was examined radiographically by means of a digital x-ray unit(D-60-S; Dong-Seo Med., Korea). The x- ray source(90kV / 25mA) was positioned perpendicularly to the digital film at a camera distance of 10 cm.
Moreover, they insisted approximat이y 50 measurement per crown regardless of whether the measurement sites are required for clinically relevant information about gap size. The measurement method used in this study was direct visualization by stereomicroscope (x 40) and reading 48 points per crown.
Therefore, the purpose of this in vitro study was to compare the casting accuracy and the porosity made with different investments and various sprue designs to ascertain what casting condition would be better for the fabrication o£ Ti-Ni cast restorations. To all possible variances that resulted from the use of materials and techniques, such as gypsum, used for the production of gypsum dies, die spacer, and impression ma坨rials, a metal die was used in which all waxing and measurements were made.
Therefore, the purpose of this in vitro study was to compare the casting accuracy and the porosity made with different investments and various sprue designs to ascertain what casting condition would be better for the fabrication o£ Ti-Ni cast restorations. To all possible variances that resulted from the use of materials and techniques, such as gypsum, used for the production of gypsum dies, die spacer, and impression ma坨rials, a metal die was used in which all waxing and measurements were made. The null hypothesis was that there will be no significant difference in the accuracy of fit and the porosity of the castings produced by different technique.

대상 데이터

Castings were made using an argon/electric arc vertical centrifugal casting machine(Titanumer, Obara, Japan) following manufacturer s instructions. 13 X 25(2r) mm ingot of Ti-Ni alloy (TN₁₀, Biosmartz Korea) was used to cast each specimen. The refractory mould was secured in the casting machine with the pattern mould orientated to the casting arm motion.

데이터처리

Data on casting accuracy were analyzed using two-way and one-way ANOVA to determine whether significant differences existed at the 95% confidence level. When deferences were significant multiple comparison test was done by Scheffe's method (< 0.

이론/모형

05). The Kruskal Wallis test used to evaluate the proper sprue design and investment from the porosity rank. Student- Newman-Keuls test were performed to identify significant differences in the number of voids according to size ranking from 0 to 2 for the different test groups.
confidence level. When deferences were significant multiple comparison test was done by Scheffe's method (< 0.05). The Kruskal Wallis test used to evaluate the proper sprue design and investment from the porosity rank.

성능/효과

3. The castings invested in the gypsum bonded investment had the greatest gaps in margin and the largest failure rate.
4. The double sprueing group and phosphate bonded investment group had significantly smaller void numbers and smaller void size than the other groups.
By use of x-ray inspection of titanium castings, Wang and Boyle24 found porosity to be a common occurrence. Results of this study indicated that large(double 8 gauge) and two sprues result in the superior accuracy and smaller porosity. The porosity was rarely found in gold or Chromium(Cr) -Cobalt(Co) alloy.

후속연구

casting accuracy and the po호osity of the restoration. Further investigations to determine the mostly appropriate casting method for Ti-Ni alloy should follow.

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표제어: PCR

동의어: Packet Collision Rate

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용어 설명: PCR은 세균 특이성이 있는 primer를 이용하여 적은 수의 세균이 있을지라도 쉽게 검출할 수 있는 유용한 방법이며, 이를 이용하여 구강 내 치면세균막이나 타액에서 직접 세균을 검출할 수 있게 되었다[8].

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