Jamil, Md Mashfique
(2018)
3D mapping of safe and danger zones of both maxilla and mandible for the placement of orthodontic mini-implant in Malay class II malocclusion patients.
Masters thesis, Universiti Sains Malaysia.
Abstract
The mini-implants, are now a common technique of treatment in Orthodontics
which offer flexibility, minimal invasiveness and acceptable costing. Mini-implants
have replaced conventional anchorage in circumstances where anchorage is considered
perilous, unsatisfactory and expected to have unwanted side effects. The main
objective of this research was to find safe location between dental roots to offer an
anatomic map to contribute the orthodontist with the information for mini-implant
placement. A cross-sectional retrospective study was performed using cone-beam
computed tomography (CBCT) images of 96 Malay class II orthodontic patients (age
range 14-30 years), receiving treatment in Orthodontic Clinic, Hospital Universiti
Sains Malaysia. The images were analyzed by the Planmeca Romexis® 3.0 software
(Planmeca Oy, Helsinki, Finland). A total of 244 variables were measured in each
image, in every image interradicular space, the mesiodistal and the buccolingual
distances measured at four cut levels of 2mm, 5mm, 8mm and 11mm from the alveolar
crest and mesiodistal tooth size width along with arch size. In this study, measurements
from the right sided second molar to the left sided second molar in both maxilla and
mandible are presented. Independent t-test and paired t-test were conducted to analyze
the mesiodistal, buccopalatal, buccolingual distances, mesiodistal tooth size width and
arch size consequently gender and side disparities. The study shows that in maxilla,
the safe zone for mini-implant placement are from distal of lateral incisor to mesial of
second molar towards the apices for the right side and mesial of first molar for the left
side. In the mandible, safe zones are mainly in posterior region between first premolarand second molar. Mesiodistal width of maxilla shows significant differences between
male and female at premolar and molar region whereas in mandible was at canine and
premolar region in both side of the jaws. Buccolingual width shows obvious significant
differences between right and left side in mandible. Other findings revealed, male has
significantly higher buccopalatal/buccolingual width, mesiodistal tooth size width,
intercanine, interpremolar, intermolar width and arch length in both side of maxilla
and mandible than female.
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