Fouad S Salama, Ahmed F Salama.
Surface Texture and Roughness of the Soldered Joints before and after Finishing and Polishing.
J Pak Dent Assoc Nov ;10(3):127-32.

OBJECTIVE: The purpose of this study was to evaluate surface texture and roughness of the soldered joints of apace maintainers before and after finishing and polishing. MATERIALS AND METHODS: Thirty-two solder joints were fabricated and used in this study. The fabricated solder joint was left untouched (no finishing car polishing) in-8 specimens (Group 1). Another 8 specimens (Group 2) were polished lightly with a burlew wheel for 25 seconds. The rest of the specimens (16) were finished with a green abrasive wheel for 25 seconds, after Which 8 specimens (Group 3) were left finished while the other 8 specimens (Group 4) were further polished lightly with a burlew wheel for 25 seconds. Surface roughness analysis of all specimens was performed using a surface roughness analyzer to determine (R) values. Statistical analysis of surface roughness was performed using one-way analysis of variance and parametric Tukey`s type multiple range tests. All specimens were prepared for scanning electron microscopic (SEM) and examined. for surface texture, RESULTS: The mean +SD of Ra for Groups 1-4 were 1.00 + 0.12, 0.79 0,14, 1.14 +0.12 and (1.311 +0.04 respectively. Specimens in Group 4 showed the smoothest surface and demonstrated significantly lower & values P<0.0001) compared to other groups. Group 2 showed the send, smoothest surface and demonstrated significantly lower Ra values compared to groups 3, and 4 (P<0.0001) as well group 1 (P<0.01). Group 3 showed the highest mean surface roughness (1.14 micrometers) and demonstrated significantly high R. values compared to groups 2 and 4 (P<0.0001). SEM evaluation of group 1 showed fused globular appearance with void and few grooves while group 2 displayed scratches lines typical of rotary, instrument and irregular, shaped gouges. The solder joints of group 3 showed deep and coarse grooves with pits, voids, and cracks while Group 4 resulted in a smooth surface with few irregular scratches. CONCLUSIONS: Untouched solder joints as well as finishing or polishing procedures used in this study could out reproduce the smoothness of the surfaces created by finishing and polishing. However, few irregular, scratches were still present after finishing and polishing. Finishing and polishing of solder joints is requited procedure in which abrasive wheel as well burlew wheel mot be used.

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