الفهرس 
Materials and methodsOnly 14 pages are availabe for public view
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Abstract
A sample of 60 vital permanent premolars and 36 non-vital
second primary molars in children aged 12 to 14 years for group I
and 6 to 8 for group II were selected from the patient population at
the dental clinic of pediatric dentistry department-faculty of
dentistry-Suez canal university .
Diagnosis was performed and the children were examined
both clinically and radiographically to be allocated to two main
groups:
group I : That included sixty vital premolars teeth that
extracted bilaterally for orthodontic treatment. In this group vital
pulpotomy done and subdivided according to the material used in
to 3 subgroups (ozonated water 1250, 2500 ppm and calcium
hydroxide).
group II: That included thirty six second primary molars
indicated for non-vital pulpotomy treatment and according to the
material used it is subdivided in to 3 subgroups (ozonated water
1250, 2500 ppm and formoeresol).
For group (I) the premolar teeth extracted and histolgical
assessment was done for group (II) assessment was done clinically
and radiographically.
Summary and Conclusion
Results of the present study showed that for group (I)
marked and outstanding feature was the increased vascularity and
dilatation of the blood vessels which was so marked with the
higher concentration of ozone. However some specimen were
reported with degeneration of odontoblasts, dissociation of
collagen fibers and reticular atrophy of the pulp tissues.
For the calcium hydroxide subgroup the pulp tissue showed
minimal degeneration changes manifested as cytoplsmic
vaculization, more or less normal appearance of collagen fibers
with minimal dissociation, however the calcific deposits appeared
larger.
For group (II) rate of success both clinically and
radiographically was higher for ozonated water of higher
concentration (2500 ppm) in comparison to both formocresol and
ozonated water of lower, concentration (1250 ppm).
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