J Korean Assoc Oral Maxillofac Surg.  2017 Apr;43(2):100-105. 10.5125/jkaoms.2017.43.2.100.

Localization of mandibular canal and assessment of the remaining alveolar bone in posterior segment of the mandible with single missing tooth using cone-beam computed tomography: a cross sectional comparative study

• Alrahaimi
• Venkatesh

• KMID: 2377013
• DOI: http://doi.org/10.5125/jkaoms.2017.43.2.100

Abstract

OBJECTIVES
Localization of the mandibular canal (MC) and measurement of the height and width of the available alveolar bone at the proposed implant site in the posterior segment of the mandible using cone-beam computed tomography (CBCT) in patients with a single missing tooth.
MATERIALS AND METHODS
A cross-sectional study was performed where CBCT scans of the patients with a single missing tooth in the posterior segment of the mandible"”premolar, I (1st) molar, and II (2nd) molar were used. The scans were assessed using OnDemand3D software (version 1.0; CyberMed Inc., Seoul, Korea) for localization of the MC asnd remaining alveolar bone both vertically (from the superior position of the MC to the crest of the alveolar ridge) and horizontally (buccolingual, 3 mm below the crest of the alveolar ridge). The findings were statistically analyzed using independent t-test.
RESULTS
A total of 120 mandibular sites (40 sites for each of the three missing premolar, I molar, and II molar) from 91 CBCT scans were analyzed. The average heights (from the alveolar crest to the superior margin of the MC) at the premolar, I molar, and II molar areas were 15.19±2.12 mm, 14.53±2.34 mm, and 14.21±2.23 mm, respectively. The average widths, measured 3 mm below the crest of the alveolar ridge, at the premolar, I molar, and II molar areas were 6.22±1.96 mm, 6.51±1.75 mm, and 7.60±2.08 mm, respectively. There was no statistically significant difference between males and females regarding the vertical and horizontal measurements of the alveolar ridges.
CONCLUSION
In the study, the measurements were averaged separately for each of the single missing teeth (premolar, I molar, or II molar), giving more accurate information for dental implant placement.

Keyword

Cone-beam computed tomography; Mandibular canal; Alveolar bone; Dental implants

MeSH Terms

Alveolar Process
Bicuspid
Cone-Beam Computed Tomography*
Cross-Sectional Studies
Dental Implants
Female
Humans
Male
Mandible*
Molar
Seoul
Tooth*
Dental Implants

Figure

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  Fig. 1 Axial cut of the lower left arch showing a curved line drawn through the adjacent teeth roots to produce a panoramic view.

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  Fig. 2 Panoramic view showing the tracing of the mandibular canal at the proposed implant placement site.

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  Fig. 3 Cross-sectional view showing the remaining alveolar bone of the edentulous space for tooth #46, assessed in regard to the vertical height from the superior position of the mandibular canal to the crest of the alveolar ridge (16.76 mm). Bucco-lingual width was assessed 3.00 mm below the crest of the alveolar ridge (6.63 mm).

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  Fig. 4 Average height in mm from the alveolar crest to the superior position of the mandibular canal at the premolar, I (1st) molar, and II (2nd) molar areas.

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  Fig. 5 Average horizontal width in mm of the alveolar ridge in the mandible at the premolar, I (1st) molar, and II (2nd) molar areas.

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  Fig. 6 Average distances in mm from the alveolar crest to the superior position of the mandibular canal based on gender.

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  Fig. 7 Average horizontal width in mm of the alveolar ridge in the mandible based on gender.

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