Page 19 - COS-FOD2015

Compend. Oral Sci:vol1(3);2015;14-20

crews used currently have a diameter that Materials and Methods:
range between 1.2-2 mm [9] , it is logical to as-
The sample was retrospectively selected from
sume that an interradicular space of more than
cone-beam computed tomography (CBCT)
3 mm is needed for miniscrew placement [10].
scans in the Radiology department of Faculty of
Min et al [11] used three dimensional images Dentistry, University Kebangsaan Malaysia
(CBCT) to examine the relation between root (UKM). The images were created using i-CAT
proximity and the success rate of miniscrew unit (Imaging Sciences International, Hatfield,
and concluded that root proximity was signifi- PA). All selected images were taken with the
cantly related to the success rate. A similar following settings: 120 KVp, 5mA, 4 seconds
conclusion was reached by Kuroda et al [12]. exposure time and 0.3 mm voxel size. Approval
However, Kim et al [13] claimed that root prox- of institutional ethical committee was obtained
imity was not a major risk factor for miniscrew to collect the data. The following general inclu-
success. Nevertheless, root contact by minis- sion criteria were used: age between 20-45
crews should be avoided as this contact is a years, no alveolar bone loss, no facial asymme-
possible cause for external root resorption [14]. tries, no cleft lip or palate or any craniofacial
anomaly, no impacted or missing teeth in the
Although previous studies showed that inter-
measured quadrant, no history of orthognathic
radicular distance can be influenced by skeletal
surgery or orthodontic treatment. The following
relationship [10], studies on root proximity
skeletal criteria were used for patient inclusion:
mostly pool data from different skeletal relation-
subjects had normal mandibular plane angle
ships. Therefore, the objective of this study was
with SN/GoMe angle, 27º- 37º [15] and sagittal
to evaluate interradicular distance in subjects
relation Class I with ANB angle 1º-3º.
with Class I skeletal relationship as a guide for
miniscrew placement.

Figure 1: A, Axial view with horizontal reference line bisecting the area
between the adjacent roots. B, sagittal view with the horizontal reference line
marking (C.E.J).

Figure 2: A, Sagittal view with mandibular interradicular measurement.
B, Sagittal view with maxillary interradicular measurement.

15