Dissertação
Avaliação histológica do tecido pulpar humano pósintrusão ortodôntica
Fecha
2013-08-13Registro en:
LAZZARETTI, Dieison Nardi. HISTOLOGICAL EVALUATION OF THE HUMAN PULP TISSUE
AFTER ORTHODONTIC INTRUSION. 2013. 48 f. Dissertação (Mestrado em Odontologia) - Universidade Federal de Santa Maria, Santa Maria, 2013.
Autor
Lazzaretti, Dieison Nardi
Institución
Resumen
The forces applied during orthodontic treatment will cause effects on the teeth
and adjacent tissues, depending on the intensity and time of application. Changes
caused in the pulp tissues are not fully clarified in the literature by the scarcity of
studies, the variety of methodologies, conflicting results and difficulty in conducting
research that simulate clinical situations. Given this fact, the present study aimed to
evaluate the human dental pulp after application of orthodontic intrusion force
through histological examination. The selected sample consisted of 34 first human
premolars, with orthodontic indication of extraction, from 17 young individuals (12-19
years old, both genders). On each patient, was applied intrusion force of 60g,
randomly in only one of the dental elements, forming Group-Experimental (GE). The
counterpart did not receive force, constituting the Control Group (CG), characterizing
a split-mouth study. After 21 days, the premolars were extracted, stored in 10%
formaldehyde, submitted to histotechnical preparation and stained with hematoxylineosin.
The analysis of the histological slides was carried out in optical microscopy by
a single experienced calibrated examiner. The paired Fisher exact test (p ≤ 0.05),
showed significant increase of fibrous tissue in the GE. The nonparametric Wilcoxon
test (p ≤ 0.05), paired, showed significant increase in the number of pulpal nodules in
the elements of GE and showed no difference in the number of blood vessels
between the groups. In 8 elements of the GE was observed the presence of
congested large caliber vessels. The orthodontic intrusion force in these conditions,
caused vascular changes in the pulp tissue, increase of fibrosis and of the number of
pulpal calcifications in the experimental elements.