Download Department of orthodontics, Faculty of dentistry, University of

British orthodontic society 2012
I.A. Abdelgader* & K. A. Emnaina
Department of orthodontics, Faculty of dentistry, University of Benghazi,
Benghazi, Libya
1- AIM
‰ To assess the prevalence of malocclusion in a
population of Libyan adolescents in terms of
different degrees of severity in relation to sex and
specific type of malocclusion.
‰ To analyze malocclusion pattern among patients
who presented for treatment at the orthodontic
unit of Benghazi dental center.
‰To provide quantitative information regarding
the pattern of dentofacial characteristics in
orthodontic patients.
‰To find the frequencies of Angle’s classes and
other dentofacial characteristics along with the
gender differences if any.
4. Results:
Out of 112 patients, the majority (70.0.5%) were
females where 29.5% were male (Figure 1) Ages of the
patients ranged from 11years & 1 month to 40 years &
six months with mean age of 20 years & two months
(SD±4.59). 50% had Angle Class I, 37.5% Cl II and
12.5% had Cl III. Overjet ( mean 4.39mm, SD±3.02)
and overbite ( mean 3.56mm, SD±2.89) was found to
be increased in 66% and 59% of the patient
respectively,(Figure 2). The distribution and amount of
spacing and crowding in relation to malocclusion is
shown in table 1 . No statistically significant differences
were found in distribution of Angle’s classes and
dentofacial characteristics between males and females
Figure 1: Distribution of type of malocclusion
withen the sample.
2- INTRODUCTION
The occurrence of occlusal anomalies varies
between different countries, ethnic and age
groups. Identifying occlusal problems, their
incidence and the need for treatment can help
to determine the appropriate treatment plan
and manpower needed in orthodontics. There
have been no studies investigating the
prevalence of various dentofacial characteristics
of Libyan orthodontic population.
Mean=4.39
Std.Dev= 3.02
N=112
Mean=3.56
Std.Dev=2.89
N=112
3- MATERIALS & METHODS
Varying dentofacial characteristics of 112 patients from
June 2009 to December 2011 from the orthodontic
practice of Benghazi dental center were analyzed. The
inclusion criteria for the sample included, those patient
with complete pre-treatment records, full permanent
dentition and no previous orthodontic treatment, A
qualitative analysis with Angle’s classification was used
to describe the antero-posterior relationship of the
maxillary and mandibular first molars during
maximum intercuspation. The incisor classification was
described on the basis of British Standard Classification
of Incisor relationship Data collected were pooled to
determine frequencies and cross tabulations of
dentofacial characteristics with Angle’s classes were
evaluated using chi-square test. The soft ware used for
data analysis was SPSS version 17.
Dentofacial
Characteristics
Crowding
(0‐1)Normal
(2‐4)Mild
(4‐6)Moderate
>7Sever
spacing
(0‐1)Normal
(2‐4)Mild
(4‐6)Moderate
>7Sever
Class I
N=56
Class II
N=41
Class III
N=13
Max
Mad
Max
Mad
Max
Mad
Max
Man
Max
Mad
Max
Mad
Max
Mad
31(55.4%)
19(33.9%)
11(19.6%)
14(25.5%)
9(16.1%)
13(23.2%)
5 (8.9%)
10(17.6%)
34(60.7%)
43(76.8%)
10(17.9%)
7 (12.5%)
8(14.3%)
4(7.1%)
20(47.6%)
19(46.3%
4(9.5%)
7(17.1%)
10(23.8%)
11(26.8%)
8(19%)
4(9.8%)
32(76.2%)
33(78.6%)
14.3(6%)
6(14.3%)
1(2.4%)
2(4.8%)
8(61.5%)
9(64.3%)
3(23.1%)
3(21.4%)
2(15.4%)
1(7.1%)
2(15.4%)
1(7.1%)
0
7(50%)
8(57.1%)
5(35.7%)
1(7.1%)
1(7.1%)
Max
Man
4(7.1%)
2(3.6%)
1(2.4%)
1(2.4%)
5(35.7%)
1(7.1%)
Table 1: Cross tabulations of dentofacial characteristics
with Angle’s classes
overjet
overbite
Figure 2: Result of mean value and frequency of overjet (left) and overbite (right) among the orthodontic
patients
References:
5- CONCLUSIONS.
¾ The
most
common
type
of
malocclusion is Angle Class I.
¾Orthodontic treatment is demanded
more by females than males .
¾The results give a detailed pattern of
malocclusion in orthodontic patients and
may provide a base line data for planning
orthodontic services.
¾There
is
a
strong
need
of
epidemiological survey to find out the
prevalence of malocclusion in Libyan
population.
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