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Comparison of internal and marginal fit of crown according to milling order in a single machinable wax disc

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¼ÛÁعü, ÀÌÁ¾Çõ, ÇϽ·æ, ÃÖÀ¯¼º,
¼Ò¼Ó »ó¼¼Á¤º¸
¼ÛÁعü ( Song Jun-Beom ) - Dankook University School of Dentistry Department of Prosthodontics
ÀÌÁ¾Çõ ( Lee Jong-Hyuk ) - Dankook University School of Dentistry Department of Prosthodontics
ÇϽ·æ ( Ha Seung-Ryong ) - Dankook University School of Dentistry Department of Prosthodontics
ÃÖÀ¯¼º ( Choi Yu-Sung ) - Dankook University School of Dentistry Department of Prosthodontics

Abstract

¸ñÀû: º» ¿¬±¸ÀÇ ¸ñÀûÀº Àý»è°¡°øÀÌ ¼øÂ÷ÀûÀ¸·Î ÁøÇàµÊ¿¡ µû¸¥ ¿Î½º µð½ºÅ©ÀÇ ±¸Á¶Àû ¾ÈÁ¤¼ºÀÇ º¯È­°¡ º¸Ã¶¹°ÀÇ ÀûÇÕµµ¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» Æò°¡ÇÏ´Â °ÍÀÌ´Ù.

Àç·á ¹× ¹æ¹ý: »èÁ¦µÈ »ó¾ÇÁ¦1´ë±¸Ä¡ ÀΰøÄ¡¾Æ¸¦ ÀÌ¿ëÇÏ¿© Ni-Cr ÇÕ±Ý Ç¥ÁظðÇüÀ» Á¦ÀÛÇÏ¿´°í, À̸¦ ½ºÄµÇÏ¿© Å©¶ó¿îÀ» µðÀÚÀÎÇÑ µÚ ¿Î½º µð½ºÅ©¸¦ Àý»è°¡°øÇÏ°í ¸Å¸ô ¹× Ni-Cr ÇÕ±ÝÀ¸·Î ÁÖÁ¶ÇÏ¿© º¸Ã¶¹°À» Á¦ÀÛÇÏ¿´´Ù. ´ÜÀÏ ¿Î½º µð½ºÅ© ³»¿¡¼­ Áß¾Ó¿¡ ÀÏ·Ä·Î À§Ä¡ÇÑ ³³ÇüµéÀº °¡Àå óÀ½ Àý»è°¡°ø µÇ´Â WM1±ººÎÅÍ ¸¶Áö¸·¿¡ Àý»è°¡°ø µÇ´Â WM5±ºÀ¸·Î ÃÑ 5°³ÀÇ ±ºÀ» ¼³Á¤ÇÏ¿´°í °¢ ±ºÀÇ ¼ö´Â 10°³·Î ÇÏ¿´´Ù. ÀûÇÕµµ´Â ½Ç¸®ÄÜ ·¹Çø®Ä« ¹æ¹ýÀ» ÀÌ¿ëÇÏ¿© º¯¿¬ °£±Ø, Ãà¸é °£±Ø, ¼±°¢°£±Ø, ±³ÇÕ¸é °£±ØÀ» ÃøÁ¤ÇÏ¿´´Ù. ÃøÁ¤°ªÀº ÀÏ¿ø¹èÄ¡ºÐ»êºÐ¼®(one-way ANOVA)À» »ç¿ëÇÏ¿© À¯ÀÇ ¼öÁØÀº 95%·Î ±×·ì °£ÀÇ Â÷À̸¦ Æò°¡ÇÑ µÚ, »çÈÄ ºÐ¼®À» À§ÇØ Tukey HSD test¸¦ ½ÃÇàÇÏ¿´´Ù(¥á = .05).

°á°ú: °¢ ±ºÀÇ º¯¿¬ °£±ØÀº WM1±º(40.41 ¡¾ 2.15 ¥ìm), WM2±º(40.44 ¡¾ 2.23 ¥ìm), WM3±º(39.96 ¡¾ 2.25 ¥ìm), WM4±º(39.96 ¡¾ 2.48 ¥ìm), WM5±º(40.57 ¡¾ 2.53 ¥ìm)À¸·Î °¢ ±º°£¿¡ À¯ÀÇÇÑ Â÷À̸¦ º¸ÀÌÁö ¾Ê¾Ò´Ù. Ãà¸é °£±Ø, ¼±°¢ °£±Ø, ±³ÇÕ¸é °£±Ø¿¡¼­µµ °¢ ±º°£¿¡ À¯ÀÇÇÑ Â÷À̸¦ º¸ÀÌÁö ¾Ê¾Ò´Ù.

°á·Ð: ´ÜÀÏ Àý»è°¡°ø¿ë ¿Î½º µð½ºÅ© ³»¿¡¼­ ¼øÂ÷Àû Àý»è°¡°ø ½Ã Å©¶ó¿îÀÇ ³»¸é ¹× º¯¿¬ ÀûÇÕµµ´Â Àý»è ¼ø¼­¿¡ ¿µÇâ ¹ÞÁö ¾Ê´Â°ÍÀ¸·Î º¸ÀδÙ.

Purpose. The purpose of present study was to evaluate the effect of changing structural stability of wax disc on the fit of prosthesis when the milling proceeded in order.

Materials and methods. Prepared maxillary left first molar was used to fabricate a Ni-Cr alloy reference model. This was scanned to design crown and then wax pattern was milled, invested and cast to fabricate prosthesis. The wax patterns located in a row centrally within a single wax disc were set into a total of five groups ranging from WM1 group that was first milled to WM5 group that was last milled and the number of each group was set as 10. Silicone replica technique was used to measure the marginal gap, axial internal gap, line angle internal gap, occlusal internal gap. Data was evaluated with one-way ANOVA with significance level set at ¥á = .05 and then Tukey HSD test was conducted for post analysis.

Results. Marginal gap measured in each group, it was 40.41 ¡¾ 2.15 ¥ìm in WM1 group, 40.44 ¡¾ 2.23 ¥ìm in WM2 group, 39.96 ¡¾ 2.25 ¥ìm in WM3 group, 39.96 ¡¾ 2.48 ¥ìm in WM4 group, and 40.57 ¡¾ 2.53 ¥ìm in WM5 group. No significant difference was found between groups. The significant difference between the groups was also not found in the axial internal gap, line angle internal gap, and occlusal internal gap.

Conclusion. Internal and marginal fit of single crown to the sequential order of milling processing in the single machinable wax disc did not seem to be affected by the sequence.

Å°¿öµå

CAD-CAM; ź¼ºº¯Çü; Àý»è°¡°ø¿ë ¿Î½º µð½ºÅ©; º¯¿¬ ÀûÇÕµµ; Àý»è°¡°ø; ³»¸é ÀûÇÕµµ; ½Ç¸®ÄÜ ·¹Çø®Ä«
CAD-CAM; Elastic deformation; Machinable wax disc; Marginal gap; Milling; Internal gap; Silicone replica

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