Page 18 - COS-FOD2015

Compendium of Oral Science Volume 1|2015

Original Article

Assessment of Interradicular Spaces for Miniscrew

Placement in Class I Subjects

Nagham Al-Jaf * , Rohaya Megat Abdul Wahab , Mohamed Ibrahim Abu Hassan
3
2
,1
1 Centre of Studies for Paediatric Dentistry and Orthodontics,Faculty of Dentistry, Universiti Teknologi MARA
Sg. Buloh Campus, Jalan Hospital, 47000 Sungai Buloh, Selangor, Malaysia.
2 Department of Orthodontics, Faculty of Dentistry Universiti Kebangsaan Malaysia (UKM) 50300 Kuala
Lumpur
3 Centre of Restorative Dentistry Studies, Faculty of Dentistry, Universiti Teknologi MARA Sg. Buloh Campus,
Jalan Hospital, 47000 Sungai Buloh, Selangor, Malaysia.

Abstract
Objectives: To assess interradicular spaces of maxilla and mandible in subjects with class I sagittal
skeletal relationship as an aid for miniscrew placement. Materials and Methods: The study was carried out
using cone-beam computed tomography (CBCT) images of 47 adult subjects with class I skeletal relationship.
Interradicular spaces were obtained at the alveolar processes from first premolar to second molar at 2 different
vertical levels (6 and 8mm) from the cementoenamel junction (C.E.J). Results: In the maxilla, the highest inter-
radicular space existed between second premolar and first molar. In the mandible, the highest interradicular
space existed between first and second molar. All mandibular measurements were higher than their respective
maxillary measurement. Generally, availability of interradicular space increases apically in both arches, but the
difference is not significant. In the maxilla, male subjects’ measurement were significantly higher at 8 mm level
between second premolar and first molar and between first and second molar Conclusions: Interradicular spac-
es in the maxillary and mandibular alveolar spaces are available for miniscrew placement. In both arches, a
more apical location provides more interradicular space. However, careful planning is needed to avoid sinus
perforation.

Keywords: Miniscrew; Interradicular spaces; CBCT.

Introduction [5]. Various anatomical sites have been sug-
gested previously for miniscrew placement [6].
The use of miniscrews to provide anchorage
However previous studies were more focused
has become a reliable practice in orthodontic
treatment [1-3]. Miniscrews are usually placed on design , shape and diameter of miniscrews
[7, 8], leaving more to be studied on the ana-
in the interradicular space to allow for simple
tomical assessment of the most commonly
placement and removal procedures, and sim-
ple force systems application [4]. However, suggested sites for miniscrews.
damaging dental roots, is still a valid concern Previous studies on assessment of interradicu-
in the clinical application of these miniscrews lar spaces and determining the so-called “safe
zones” for miniscrew placement, have recom-
*Corresponding to: Dr Nagham Al-Jaf, Centre of Studies
for Paediatric Dentistry and Orthodontics,Faculty of Den- mended minimal clearance of 1 mm of alveolar
tistry, Universiti Teknologi MARA Sg. Buloh Campus, bone around the screw to preserve the health
Jalan Hospital, 47000 Sungai Buloh, Malaysia.
Email: nagham@salam.uitm.edu.my of the periodontium [2, 9]. And since the minis-
Tel: +603-61266460 Fax: +603-61266103

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