كليدواژه :
Causes of extraction , دندانپزشكي , Extracted teeth , خارج كردن دندانها , دانش آموزان , Missing teeth
چكيده لاتين :
Tooth extraction, for any reasons, puts negative mentally and spritually
effects on the individuals. Additionally it leads to disorders in mastication,
esthetics and spech. The high rate of tooth loss among adults and
adolescents. have stimulated the investigators to embark on this resarch.
The puprose of this investigation was to determine the prevalence and
reasons of tooth extraction among (15-18)-year-old students in Mashhad
generally and according to sex.
In this cross - sectional study, the applied techniques consisted of direct
observation, question and in doubtful cases OPG. A total number of 906
high shcool students (416 femals and 490 males) with the age ranging
fromhe aim of the present study was to investigate the effects of dental
15-18 years old were selected from seven education districts of the city of
Mashhad in a random cluster sampling method. Totally, 25368 teeth were
evaluated. Statistical analysis was performed with SPSS of district data test,
using fisher exact test in two by two cross tabulation, Chi-square test and
likelihood - ratio stafic in cross tabulation for comparing. The findings
were as follows:
1- The total missing teeth due to extraction were 209 in. the population,
125(60%) teeth in boys and 84 (40%) in girls. The differences between them were not significant (P=0..86)2- The total extracted teeth in the upper arch was 39% and that of the lower arch was 61% (P=0.001).
3- In the upper arch, 20% of the extracted teeth were in boys and 19% were in girls (P=0.530).
4- In the lower arch, 40% of the extracted teeth were in boys and 21% were in girls (P=0.08).
5- Extracted teeth in the upper arch in boys were 20% and in the lower arch were 40.2% (P=0.000).
6- Extracted teeth in the upper arch in girls were 20% and in the lower arch were 21% (P=0.661).
7- The number of the extracted teeth in the right side was (54.5%) 114 and that of the left side was 95 (45.5%) (P=0.187).
8- The Frequency of the exgtracted teeth was as follows: First molars (61%), First premolars (29%), second premolars (4.5%), Laterals (2-4%), canines (1.4%) and centrals (1.4%).
9- The total extracted anterior teeth were 11 (5.2%), 9 teeth in boys and 2 in girls (P.V=0.005). Extracted posterior teeth were 94.8% that were nine times more than the anterior teeth.
10- The extraction of the posterior teeth were due to caries and that of the anterior teeth were due to trauma, crowding and malposition.
11- The extraction of the anterior teeth in boys were 4.5 times more than girls. Based on the findings of this investigation, the following conclusions drawn:
Tooth extraction in boys were more than girls, extracted teeth in the lower arch were more than the upper, extracted teeth in the right side was more than the left side. Extraction of the posterior teeth were 19 times more than the anterior teeth because of the severe caries and the extraction of the anterior teeth were mainly due to trauma, crowding and malposition.
Extraction of the anterior teeth in boy were 4.5 times more than the girls. The most extracted tooth was the first molar that in the lower jaw was twice of the upper jaw.
