Imaging Sci Dent.  2017 Sep;47(3):157-164. 10.5624/isd.2017.47.3.157.

Distances from the root apices of posterior teeth to the maxillary sinus and mandibular canal in patients with skeletal open bite: A cone-beam computed tomography study

• Kosumarl W
• Patanaporn V
• Jotikasthira D
• Janhom A

• KMID: 2390080
• DOI: http://doi.org/10.5624/isd.2017.47.3.157

Abstract

PURPOSE
This study determined and compared the distances from the maxillary root apices of posterior teeth to the floor of the maxillary sinus, or maxillary sinus distances (MSDs), and the distances from the mandibular root apices of the posterior teeth to the mandibular canal, or mandibular canal distances (MCDs), in Thai subjects with skeletal open bite and skeletal normal bite.
MATERIALS AND METHODS
Pretreatment cone-beam computed tomography (CBCT) images were obtained from 30 Thai orthodontic patients (15 patients with skeletal normal bite and 15 with skeletal open bite) whose ages ranged from 14 to 28 years. The CBCT images of the patients were processed and measured using the Romexis Viewer program. The MSDs and MCDs from the root apices of the maxillary and mandibular second premolar, first molar, and second molar to the maxillary sinus floor or the mandibular canal were measured perpendicularly to the occlusal plane. The Student t test was used for comparisons between the 2 groups.
RESULTS
The greatest mean MSDs were from the root apex of the second premolars in both groups, whereas the least mean MSDs were from the mesiobuccal root apex of the second molars. The greatest mean MCDs were from the mesial root apex of the first molars, whereas the least mean MCDs were from the distal root apex of the second molars.
CONCLUSION
There were no differences in the mean MSDs or the mean MCDs between the skeletal normal bite group and the skeletal open bite group.

Keyword

Maxillary Sinus; Mandibular Nerve; Tooth; Cone-Beam Computed Tomography

MeSH Terms

Asian Continental Ancestry Group
Bicuspid
Cone-Beam Computed Tomography*
Dental Occlusion
Humans
Mandibular Nerve
Maxillary Sinus*
Molar
Open Bite*
Tooth*

Figure

• 

  Fig. 1 Screen capture shows the orientation of the cone-beam computed tomography images of the right maxillary first molar for the measurements. A. Coronal view. B. Sagittal view. C. Axial view.

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  Fig. 2 Screen capture shows the distance between the root apex of the maxillary posterior teeth and maxillary sinus floor (white line).

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  Fig. 3 Screen capture shows the distance (white line) between the root apex of the mandibular posterior teeth and mandibular canal (dotted white circle).

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