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RELIABILITY OF SPIRAL TOMOGRAPHY FOR IMPLANT SITE MEASUREMENT OF THE MANDIBLE

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Abstract

ÀúÀÚ´Â ¹®Ä¡¾Ç ¹× ºÎºÐÀûÀ¸·Î ¹«Ä¡¾ÇÀÎ °ÇÁ¶ ÇϾǰñ 31°³¸¦ ´ë»óÀ¸·Î ÃÑ 99°³ÀÇ ¹«Ä¡¾Ç
ºÎÀ§¸¦ ¼³Á¤ÇÏ°í ZPC ½ÃÆíÀ» À§Ä¡½ÃŲ ÈÄ °¢°¢ÀÇ ½ÃÆí ºÎÀ§¿¡ À־ Àü»êÈ­ ´ÜÃþÃÔ¿µ ¹×
SCANORA ³ª¼±Çü ´ÜÃþÃÔ¿µÀ» ½ÃÇàÇÏ¿´´Ù ÃÔ¿µµÈ ¹æ»ç¼±»çÁø¿¡¼­ ½ÃÆíÀÇ Å©±â¿Í ÇϾǰñ
´Ü¸éÀÇ °èÃø Ç׸ñÀ» ÃøÁ¤ÇÏ¿© Àü»êÈ­ ´ÜÃþÃÔ¿µ°ú ³ª¼±Çü ´ÜÃþÃÔ¿µ °£ÀÇ Â÷À̸¦ ºÐ¼®ÇÑ °á°ú
´ÙÀ½°ú °°Àº °á·ÐÀ» ¾ò¾ú´Ù.
1. ZPC ½ÃÆíÀ» »ç¿ëÇÏ¿© ½ÇÁ¦ ÃøÁ¤Ä¡¿Í ¹æ»ç¼± »çÁø ÃøÁ¤Ä¡¸¦ ºñ±³ÇÑ °á°ú Àü»êÈ­ ´ÜÃþ
ÃÔ¿µ »çÁøÀÇ Æò±Õ¿ÀÂ÷´Â ¼öÁ÷ºÎ 0.07§®, ¼öÆòºÎ -0.06§®¸¦ º¸¿´°í, SCANORA ³ª¼±Çü ´ÜÃþ
ÃÔ¿µ»çÁøÀÇ Æò±Õ¿ÀÂ÷´Â ¼öÁ÷ºÎ 0.06§®, ¼öÆòºÎ -0.12§®¸¦ º¸¿´´Ù. ÃøÁ¤Ä¡ÀÇ Æò±Õ¿ÀÂ÷¿¡ ÀÖ¾î
¼­ µÎ ÃÔ¿µ¹æ¹ý °£ÀÇ Â÷À̸¦ °íÂûÇÑ °á°ú ÇϾǰáÇպΠ(S) ½ÃÆíÀÇ ¼öÆò ÃøÁ¤Ä¡¿¡¼­¸¸ À¯ÀǼº
ÀÖ´Â Â÷ÀÌ°¡ ÀÖ¾ú°í (p<0.05), ³ª¸ÓÁö ¸ðµç ºÎÀ§ÀÇ ÃøÁ¤Ä¡¿¡ À־´Â µÎ ÃÔ¿µ¹æ¹ý °£¿¡ À¯
ÀǼº ÀÖ´Â Â÷ÀÌ°¡ ¾ø¾ú´Ù (p>0.05).
2. Ä¡Á¶Á¤¿¡¼­ºÎÅÍ ÇϾǰñ ÇÏ¿¬±îÁöÀÇ °Å¸® (H) ¹× Ä¡Á¶Á¤¿¡¼­ºÎÅÍ ÇϾǰüÀÇ »ó¹æ °æ°è±î
ÁöÀÇ °Å¸® (Y)¸¦ ºñ±³ÇÑ °á°ú µÎ ÃÔ¿µ¹æ¹ý °£¿¡ À¯ÀǼº ÀÖ´Â Â÷ÀÌ°¡ ¾ø¾ú´Ù (p>0.05).
3. ÇϾǰñÀÇ ¼³Ãø ÃÖ´ë µ¹ÃâºÎ¿¡¼­ ÇùÃø ÃÖ´ë µ¹ÃâºÎ±îÁöÀÇ ¼öÆò°Å¸® (W) ¹× ÇϾǰñÀÇ
¼³Ãø¿¡¼­ ÇϾǰüÀÇ ¼³Ãø °æ°è±îÁöÀÇ ¼öÆò°Å¸® (X)¸¦ ºñ±³ÇÑ °á°ú ÇϾǰáÇպΠ(S), ÀÌ°ø
(Me), ÀÌ°ø°ú ÇϾǰøÀÇ »çÀÌ 1/4ÁöÁ¡ (Ml)¿¡ À־´Â µÎ ÃÔ¿µ¹æ¹ý °£¿¡ À¯ÀǼº ÀÖ´Â Â÷ÀÌ
°¡ ¾ø¾úÀ¸³ª (p>0.05), ÀÌ°ø°ú ÇϾǰø°úÀÇ 1/2 ÁöÁ¡ (M2)¿¡¼­´Â À¯ÀǼº ÀÖ´Â Â÷ÀÌ°¡ ÀÖ¾ú´Ù
(p<0.05).
4. ÃøÁ¤°ªÀÇ ÆÇÂûÀÚ °£ Æò±Õ º¯È­ ¹üÀ§´Â ÇϾǰáÇպΠ(S)¸¦ Á¦¿ÜÇÑ ³ª¸ÓÁö ¸ðµç ºÎÀ§¿¡
À־ SCANORA³ª¼±Çü ´ÜÃþÃÔ¿µÀÌ Àü»êÈ­ ´ÜÃþÃÔ¿µ¿¡ ºñÇÏ¿© º¸´Ù ÄÇ´Ù.
5. ÇϾǰüÀÇ ÀÎÁö´ÉÀ» ºñ±³ÇÑ °á°ú µÎ ÃÔ¿µ¹æ¹ý °£¿¡ À¯ÀǼº ÀÖ´Â Â÷ÀÌ°¡ ¸Ö¾ú´Ù
(p>0.05).
°á·ÐÀûÀ¸·Î ÇϾǰñ ¸Å½Ä ºÎÀ§ °èÃøÀ» À§ÇÑ ÃÔ¿µ¹æ¹ýÀ¸·Î½á SCANORA ³ª¼±Çü ´ÜÃþÃÔ¿µ
¹ýÀÌ Àü»êÈ­ ´ÜÃþÃÔ¿µ¹ý¿¡ ºñÇÏ¿© ÇÏ¾Ç ÃÖÈÄ¹æ ¹«Ä¡¾Ç ºÎÀ§ÀÇ Æò°¡¿¡ À־ ´Ù¼Ò Á¤È®µµ°¡
¶³¾îÁö´Â °á°ú¸¦ º¸¿´´Ù. ÀÌ ·¯ ÇÑ Â÷ÀÌ ´Â ÇÏ¾Ç ÃÖÈĹæºÎ¿¡¼­ Àü»êÈ­ ´ÜÃþÃÔ¿µ»çÁø¿¡ ºñÇÏ
¿© SCANORA ³ª¼±Çü ´ÜÃþÃÔ¿µ»çÁø¿¡¼­ ÇغÎÇÐÀû ±¸Á¶¹°ÀÇ °æ°è¸¦ ÆľÇÇϱⰡ º¸´Ù ¾î·Á
¿ü´ø °Í¿¡ ÁÖ·Î ±âÀεǴ °ÍÀ¸·Î »ç·áµÇ´Â ¹Ù ÇâÈÄ ÀÌ·¯ÇÑ ºÎºÐ¿¡ À־ ÀåºñÀÇ °³¼±À» À§
ÇÑ ¿¬±¸ °³¹ßÀÌ ÇÊ¿äÇϸ®¶ó »ý°¢µÈ´Ù. ±×·¯³ª Àü¹ÝÀûÀ¸·Î ¹æ»ç¼± ³ëÃâ Á¤µµ, ºñ¿ë µîÀ» ¾Æ¿ï
·¯ °í·ÁÇÒ ¶§ SCANORA ³ª¼±Çü ´ÜÃþÃÔ¿µ¹ýÀÌ ÇϾǰñ ¸Å½Ä ºÎÀ§ °èÃøÀ» À§ÇÑ ÃÔ¿µ¹æ¹ýÀ¸
·Î¼­ ºñ±³Àû ¿ì¼öÇÑ ÃÔ¿µ¹ýÀ̶ó°í ÇÒ ¼ö ÀÖÀ» °ÍÀÌ´Ù.
#ÃÊ·Ï#
The purpose of this study was to evaluate the accuracy and usefulness of spiral
nomography through the comparison and analysis of SCANORA cross-sectional
tomographs and Dentascan computed tomographic images of dry mandibles taken by a
SCANORA spiral tomographic machine and a computed tomographic machine.
Thirty-one dry mandibles with full or partial edentulous areas were used. To evaluate
the possible effect of location in the edentulous area, it was divided into 4 regions of
Me (region of mental foramen), Ml (the midportion between Me and M2), M2 (the
midportion between mental foramen and mandibular foramen) and S (the midportion of
the mandibular symphysis). A ZPC column (sized 4§®¡¿5§®) was seated on the
edentulous regions of Me, Ml, M2 and S using the acrylic steno. Then SCANORA spiral
tomography and computed nomography were taken on the edentulous regions which
contained the ZPC column. The ZPC columns and cross-sectional images of the
mandible were measured in the radiographs by three observers and the differences
between the two imaging modalities were analysed.
The results were as follows:
1. In comparing the actual measurements of the ZPC column and measurements in the
radiographs, the mean error of the DentaScan computed topography was 0.07§® in
vertical direction and -0.06§® in horizontal direction, while the mean error of the
SCANORA spiral tomography was 0.06§® in vertical direction and -0.12§® in horizontal
direction. There was a significant difference between the two radiogrlphic techniques in
the horizontal measurement of the ZPC column of the symphysis region (p<0.05). But
there was no significant difference in the measurements of other regions (p>0.05).
2. In measurements of the distance from the alveolar crest to the inferior border of
the mandible (H), and of the distance from the alveolar crest to the superior border of
the mandibular canal (Y), there was no significant difference between the two
radiographic techniques (p>0.05).
3. In measurements of the distance from the lingual border of the mandible to the
buccal border of the mandible (W), and of the distance from the lingual border of the
mandible to the lingual border of the mandible canal (X), there was a significant
difference between the two radiographic techniques in measurements of the midportion
between the mental (oramen and the mandibular foramen (M2) (p<0.05). But there were
no signi(icant differences in measurements of the other regions of symphysis (S), mental
foramen (Me), the first one-fourth portion between the mental foramen and the
mandibular foramen (Ml) (p>0.05).
4. Considering the mean range of measurements between observers, the measurements
of SCANORA spiral nomography showed higher value than those of Dentascan
computed tomography, except in measurements of symphysis (S).
5. On the detectability of the mandibular canal, there was no significant difference
between the two radiographic techniques (p>0.05).
In conclusion, SCANORA spiral tomography demonstrated a higher interobserver
variance than that of DentaScan computed topography for implant site measurements in
the posterior edentulous area of the mandible. These differences were mainly the result
of difficulty in the detection of the border of the mandible in SCANORA spiral
tomography But considering the cost and the radiation exposure, SCANORA spiral
nomography can be said to be a relatively good ra¾ßographic technique for implant site
measurement.

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