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Analysis of implant strain value exerted using different screw tightening protocols in screw-retained 3-unit prostheses

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±è»ó¹ü, À̵ÎÇü, ÀÌûÈñ,
¼Ò¼Ó »ó¼¼Á¤º¸
±è»ó¹ü ( Kim Sang-Beom ) - Kyungpook National University School of Dentistry Department of Prosthodontics
À̵ÎÇü ( Lee Du-Hyeong ) - Kyungpook National University School of Dentistry Department of Prosthodontics
ÀÌûÈñ ( Lee Cheong-Hee ) - Kyungpook National University School of Dentistry Department of Prosthodontics

Abstract

¸ñÀû: º» ¿¬±¸ÀÇ ¸ñÀûÀº 3º» ³ª»ç À¯ÁöÇü ÀÓÇöõÆ® º¸Ã¶¹°ÀÇ ³ª»ç °íÁ¤ ¹æ½Ä¿¡ µû¸¥ Ä¡°æºÎ¿¡ ¹ß»ýÇÏ´Â º¯ÇüÀ²À» ÃøÁ¤ÇÏ°í ºñ±³Çϱâ À§ÇÔÀÌ´Ù.

Àç·á ¹× ¹æ¹ý: 2°¡Áö Á¾·ùÀÇ ÀÓÇöõÆ®(¿ÜºÎ¿¬°á¹æ½Ä, ³»ºÎ¿¬°á¹æ½Ä)¸¦ °¢°¢ 2°³¾¿ 4°³ ÀÓÇöõÆ® °íÁ¤Ã¼ °æºÎ¿¡ ½ºÆ®·¹ÀÎ °ÔÀÌÁö¸¦ ºÎÂøÇÑ ÈÄ, °¢ Á¾·ùÀÇ ¾ÆÅ©¸±¸¯ ·¹Áø ¸ðÇü 2°³¸¦ Á¦ÀÛÇÏ¿´´Ù. CAD-CAMÀ» ÀÌ¿ëÇÏ¿© hex ¹× nonhex Áö´ëÁÖ¸¦ Á¦ÀÛÇÏ¿´°í,(EH, ENH, IH& INH ±º) ³ª»ç-½Ã¸àÆ® À¯Áö º¸Ã¶ °³³äÀ¸·Î º¸Ã¶¹°À» ºñ±Í±Ý¼ÓÀ¸·Î Á¦ÀÛÇÏ¿´´Ù. °¢ Áö´ëÁÖ¸¦ 10 Ncm ÅäÅ©·Î °íÁ¤ÇÑ ÈÄ, º¸Ã¶¹°À» ÇÕÂøÇÏ¿´´Ù. ³ª»ç¸¦ 3°¡ÁöÀÇ ´Ù¸¥ ¹æ¹ýÀ¸·Î 30 Ncm±îÁö °íÁ¤ÇÑ ´ÙÀ½, 5ºÐ ÈÄ º¯ÇüÀ²À» ÃøÁ¤ÇÑ ÈÄ Æò±Õºñ±³ ¹× ±º°£ »óÈ£ÀÛ¿ëÀ» Æò°¡ÇÏ¿´´Ù (¥á = .05).

°á°ú: ¿ÜºÎ¿¬°á¹æ½Ä ±ºÀº ³»ºÎ¿¬°á¹æ½Ä ±º¿¡ ºñÇÏ¿© À¯ÀÇÇÏ°Ô ³·Àº º¯ÇüÀ²À» ³ªÅ¸³ÂÀ¸¸ç, EH±ºÀÌ ENH±ºº¸´Ù À¯ÀÇÇÏ°Ô ³·Àº º¯ÇüÀ²À» ³ªÅ¸³»¾úÀ¸³ª (P < .05), ³ª»ç °íÁ¤ ¹æ¹ý¿¡ µû¸¥ Â÷ÀÌ´Â ¾ø¾ú´Ù (P > .05). IH±ºÀÌ INH±º¿¡ ºñÇÏ¿© À¯ÀÇÇÏ°Ô ³ôÀº º¯ÇüÀ²À» ³ªÅ¸³»¾úÀ¸¸ç IH±º¿¡¼­¸¸ ³ª»ç °íÁ¤ ¹æ¹ý¿¡ µû¶ó¼­µµ Â÷ÀÌ°¡ ÀÖ¾ú´Ù (P < .05).

°á·Ð: ³ª»ç À¯ÁöÇü ÀÓÇöõÆ® º¸Ã¶¹°¿¡¼­´Â ¿ÜºÎ¿¬°á¹æ½ÄÀÎ °æ¿ì¿¡´Â Å« ¿µÇâÀÌ ¾øÀ¸³ª, ³»ºÎ¿¬°á¹æ½Ä¿¡¼­´Â º¸´Ù Å« º¯ÇüÀ²ÀÌ ¹ß»ýÇÏ°í ³ª»ç °íÁ¤ ¹æ¹ýµµ ¿µÇâÀ» ÁÖ´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù.

Purpose: The purpose of this study was to measure and compare the strain value exerted on the cervical area using different screw tightening protocols in implant-supported, screw-retained 3-unit prostheses.

Materials and methods: Strain gauges were attached to four implants: two external and two internal. Thereafter, two study model were designed each type using acrylic resin. CAD-CAM was used to design hex and nonhex abutments for each group (EH, ENH, IH, and INH group) and Screw-cement-retained prostheses were also designed using a nonprecious base metal. Abutment was fixed with 10 Ncm torque, and the prosthesis was cemented. Screws were fixed with 30 Ncm torque using different three protocols. After 5 min, the strain gauge level was measured, and group analysis was performed (¥á=.05).

Results: External group showed significantly lower strain values than internal group and the EH group showed significantly lower strain values than the ENH group (P<.05). There was no difference in strain value based on the types of screw tightening protocols in same group (P>.05). The IH group exhibited significantly higher strain values than the INH group and the IH group showed a significant difference in strain values based on the types of screw tightening protocols used (P<.05).

Conclusion: There was no significant effect on the external type in the implant-supported, screw-retained prostheses. However, strain values were high in the internal type, and the types of screw tightening protocol significantly affected these implants.

Å°¿öµå

³ª»ç-½Ã¸àÆ® À¯Áö º¸Ã¶; ³ª»ç °íÁ¤ ¹æ¹ý; º¯ÇüÀ²
Screw-cement-reatined prostheses; Screw tightening protocols; Strain value

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