[논문]Effect of soldering techniques and gapdistance on tensile strength of soldered Ni-Cr alloy joint

Lee, Sang-Yeob; Lee, Jong-Hyuk

doi:10.4047/jap.2010.2.4.117

[국내논문] Effect of soldering techniques and gapdistance on tensile strength of soldered Ni-Cr alloy joint 원문보기

The journal of advanced prosthodontics, v.2 no.4, 2010년, pp.117 - 121

Lee, Sang-Yeob (DepartmentofProsthodontics,CollegeofDentistry,DankookUniversity) , Lee, Jong-Hyuk (DepartmentofProsthodontics,CollegeofDentistry,DankookUniversity)

Abstract ▼ AI-Helper

PURPOSE. The present study was intended to evaluate the effect of soldering techniques with infrared ray and gas torch under different gap distances (0.3 mm and 0.5 mm) on the tensile strength and surface porosity formation in Ni-Cr base metal alloy. MATERIALS AND METHODS. Thirty five dumbbell shaped Ni-Cr alloy specimens were prepared and assigned to 5 groups according to the soldering method and the gap distance. For the soldering methods, gas torch (G group) and infrared ray (IR group) were compared and each group was subdivided by corresponding gap distance (0.3 mm: G3 and IR3, 0.5 mm: G5, IR5). Specimens of the experimental groups were sectioned in the middle with a diamond disk and embedded in solder blocks according to the predetermined distance. As a control group, 7 specimens were prepared without sectioning or soldering. After the soldering procedure, a tensile strength test was performed using universal testing machine at a crosshead speed 1 mm/min. The proportions of porosity on the fractured surface were calculated on the images acquired through the scanning electronic microscope. RESULTS. Every specimen of G3, G5, IR3 and IR5 was fractured on the solder joint area. However, there was no significant difference between the test groups (P > .05). There was a negative correlation between porosity formation and tensile strength in all the specimens in the test groups (P < .05). CONCLUSION. There was no significant difference in ultimate tensile strength of joints and porosity formations between the gas-oxygen torch soldering and infrared ray soldering technique or between the gap distance of 0.3 mm and 0.5 mm.

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가설 설정

The mean and the standard deviation of tensile strength are presented in Table 3. The control group showed apparently higher tensile strength than test groups. In gas torch soldered groups, the specimens with 5.

제안 방법

The purpose of this study was to evaluate and compare the effects of different soldering techniques including infrared ray and gas torch under different gap distance conditions (0.3 mm and 0.5 mm) on the tensile strength and the surface porosity in Ni-Cr base metal alloy.
Thirty five wax patterns 18 mm in length, 3 mm in diameter and two 6 mm spheres on both ends were prepared for tensile testing (Fig. 1). The wax patterns were invested in a phosphate bonded investment and casting was performed with Ni-Cr based dental alloy (Rexillium^® V, Jeneric/Pentron, San diego, USA) using a centrifugal casting machine and a propane gas-oxygen torch according to the manufacturer’s instructions.
Additional polishing procedures were not performed. The specimens were randomly assigned to five groups by soldering methods and gap distance (Table 2). Control group was tested for tensile strength without prior sectioning and soldering procedure.
After tensile testing, the fractured surface of the specimens were analyzed with SEM (Hitachi S-3000H Scanning electron microscope, Hitachi Inc., Tokyo, Japan) and evaluated for the presence of porosity or voids. The percentage of the porous area to entire joint surface was measured with the image software (Adobe Acrobat 8 Professional, Adobe Systems, San Jose, USA) (Fig.
In this study, tensile strength and porosity formation were measured and compared when the two different soldering techniques, which were gas torch soldering and infrared ray soldering, were applied. The influence of the gap distance on the results was also evaluated.
This comparative study investigated the tensile strength and porosity formation of the joint by two soldering techniques (gas-torch soldering, infrared ray soldering) and evaluated the effect of the gap distance on the results.
Tensile testing was performed using a universal testing machine (Instron® 5582, Instron Co., Ltd., Canton, USA).

대상 데이터

The specimens were blasted with 50 μm aluminous oxide particle.

데이터처리

Pearson’s correlation test was used to evaluate whether the presence of porosity may have influenced the tensile strength.
The statistical analysis was carried out to find whether any significant difference of tensile strength or porosity among the groups. The data were analyzed at a confidence level of 95% with Kruskal-Wallis test using the statistical analysis software (SPSS version 12.0, SPSS Inc., Chicago, USA). Pearson’s correlation test was used to evaluate whether the presence of porosity may have influenced the tensile strength.

성능/효과

174). The mean and the standard deviation of joint porosity are presented in Table 4. G3 group shows the highest porosity presence on soldered joint and G5 group showed the smallest number of the percent. The value of the infrared soldering showed relatively smaller standard deviation than those of the gas torch soldering groups.

후속연구

As fixed partial dentures are exposed to repetitive mechanical stresses during mastication, further studies should evaluate the long-term effectiveness of the soldering methods simulated under intraoral conditions. In addition, the effect of the gap should be closely examined to improve the quality of the prosthesis with joints to be soldered.

참고문헌 (27)

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[국내논문] Effect of soldering techniques and gapdistance on tensile strength of soldered Ni-Cr alloy joint 원문보기

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가설 설정

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[국내논문] Effect of soldering techniques and gapdistance on tensile strength of soldered Ni-Cr alloy joint 원문보기

Abstract ▼ AI-Helper

Keyword

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가설 설정

제안 방법

대상 데이터

데이터처리

성능/효과

후속연구

참고문헌 (27)

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관련 콘텐츠

원문 보기

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