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Evaluation of bone quality in alveolar crest obscured by dental implants ; A pilot study by densitometric digital analysis in mandibular bone specimen

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±Ç±à·Ï ( Kwon Kung-Rock ) - °æÈñ´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Ã¶Çб³½Ç

Abstract

ÀÓÇöõÆ® Ä¡°ú ÀÓ»ó¿¡¼­, Çù, ¼³ÃøÀÇ °ñÁ¶Á÷ »óÅ´ ÀÓÇöõÆ® Àç·áÀÇ ³ôÀº ¹Ðµµ ¶§¹®¿¡ ±¸³»¿ë ¹æ»ç¼±»çÁøÀ¸·Î´Â ÆľÇÇÒ ¼ö ¾øÀ¸³ª, µðÁöÅÐ ºÐ¼®À» ÀÌ¿ëÇÑ Á¤·®Àû ¹æ»ç¼± ºÐ¼®¹ýÀ» »ç¿ëÇÏ¿© ÀÌ ºÎÀ§¸¦ ÆľÇÇÏ°íÀÚ ÇÏ¿´´Ù. °ÇÁ¶ ÇϾǰñ¿¡ 10°³ÀÇ Á÷°æ 3.3§®ÀÎ solid screwÇüÅÂÀÇ ITI ÀÓÇöõÆ®(Institute Straumann, Waldenberg, Switzerland)À» ¸Å½ÄÇÑ ´ÙÀ½, À̵éÀ» 10°³ÀÇ °ñ ½ÃÆíÀ¸·Î Àý´ÜÇÑ ÈÄ, ¹æ»ç¼±»çÁø ÃÔ¿µÀ» ½ÃÇàÇß´Ù. ÀÏ·ÃÀÇ Áßø»óÀ» ¾ò±â À§ÇØ, Ưº°È÷ °í¾ÈµÈ ¹æ»ç¼±Çʸ§ °íÁ¤±â¿Í D¼Óµµ Çʸ§(Ultraspeed, Kodak, USA)À» »ç¿ëÇßÀ¸¸ç, °í ÇØ»óµµÀÇ µðÁöÅÐ ºÐ¼®À» À§ÇØ, ºñµð¿À Ä«¸Þ¶ó(Kodak-EikonixTM, USA)·Î Çʸ§À» scanÇÏ°í software (LaboImage, Computing Science Center, Geneva university)¸¦ ÀÌ¿ëÇØ Á¤·®Àû ºÐ¼®À» ½ÃÇàÇß´Ù. ¹æ»ç¼± ÃÔ¿µÀº 4 ¹æÇâ(Åë»óÀûÀÎ periapical projection¿¡ ÀÇÇÑ ±Ù, ¿ø½É(MD)¹æÇâ ¹× Çù, ¼³(BL) Á¶»çÀ§, Åë»óÀûÀÎ occlusal projection¿¡ ÁØÇÑ 25µµ °æ»çÁø ±Ù, ¿ø½É(OMD) ¹× 25µµ °æ»çÁø Çù, ¼³(OBL) Á¶»çÀ§)À¸·Î ½ÃÇàÇßÀ¸¸ç, °¢ ½ÃÆí¿¡¼­ 4ÀåÀÇ ¿¬¼Ó Áßø ¹æ»ç¼±»çÁø (superimposable radiograph)À» ÀÓÇöõÆ® ¸Å½Ä°ø õ°ø ÈÄ, ÀÓÇöõÆ® ¸ÅÄ¡ ÈÄ, ÀÓÇöõÆ® ÁÖº¯(Çù, ¼³) °ñ ¼Õ»ó ÈÄ, ÀÓÇöõÆ® Á¦°Å ÈÄÀÇ »óȲ¿¡¼­ Ç¥ÁØÈ­µÈ ¹æ¹ýÀ¸·Î ÃÔ¿µÇؼ­ ¾ò¾ú´Ù. ±â¼úÀûÀÎ ¾î·Á¿ò¿¡µµ ºÒ±¸ÇÏ°í, occlusal projectionÀ¸·Î ÃÔ¿µÇÏ°í, À̸¦ µðÁöÅÐ ³óµµ ºÐ¼®ÇÑ ¹æ¹ý¿¡¼­, Ä¡°ú ÀÓÇöõÆ® ÁÖº¯ Çù, ¼³ÃøÀÇ ¹Ì¼¼°ñ º¯È­¸¦ ÆľÇÇÒ ¼ö ÀÖÀ» °ÍÀ¸·Î º¸¿´´Ù. ƯÈ÷, occlusal projectionÀÌ periapical projection¿¡ ºñÇØ ´õ¿í ¹Î°¨ÇÑ °ñ º¯È­¸¦ ÀÎÁöÇÏ´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù. ºñ·Ï ÀÌ ½ÇÇèÀÇ °á°ú°¡ Á¦ÇÑµÈ Á¶°Ç¿¡¼­ ¾ò¾îÁ³Áö¸¸, ½ÇÁ¦ ÀÓÇöõÆ® ÀÓ»ó¿¡¼­ Àӻ󰡵鿡°Ô Áø´ÜÀû Â÷¿ø¿¡¼­ÀÇ »õ·Î¿î °¡´É¼º°ú ´Ù¾ç¼ºÀ» Á¦½ÃÇØ ÁÙ ¼ö ÀÖÀ¸¸®¶ó »ç·áµÈ´Ù.

Despite of technical difficulties, the combination of occlusal projection and densitometric digital analysis may ultimately provide a means of detection of subtle bone loss at the facial and lingual side of dental implant (Oblique occlusal view is more useful for ITI dental implant due to its contour of shoulder as like tulip¡¯ flower). In this study, conventional periapical projections of x-ray beam had shown more high sensitivity to detect the bony defects than oblique occlusal projections in alveolar crest obscured by dental implants or not, even if the difference was not statistically significant. Unlike conventional periapical projections, occusal projections combined with densitometric digital analysis technique may provide a means for detection of subtle bone change at the all around of implants without obscuring effect by implant itself. Although the results from this in vitro study were performed under limited circumstances, these results might afford more possibility and versatile modality of diagnosis options to clinician in the implant practice.

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