Regeneração tecidual guiada com membranas reabsorviveis em retrações gengivais : estudo histometrico em cães

AUTOR(ES)

Marcio Zaffalon Casati

DATA DE PUBLICAÇÃO

1999

RESUMO

The goal of this investigation was to evaluate histologically and histometrically the healing process of gingival recessions treated by guided tissue regeneration with polylactic acid membranes (GTR-group) and to compared it to that obtained with coronally positioned flaps (CPF-group). Five mongrel dogs were used in the experiment. Gingival recessions were surgically created on the bucal aspect of the upper cuspids after removing the soft and hard tissue using hand instruments. The created defects, measuring 5x7 mm, were exposed to plaque accumulation for a period of 3 months. After this period, the contralateral defects were randomly assigned to the GTR-group or the CPF-group. After 3 months ofhealing, the dogs were sacrificed and the blocks containing the experimental specimens were processed for histological analysis. The histometric parameters evaluated were: length of sulcular and junctional epithelium, connective tissue adaptation, new cementum, new bone and defect coverage. The extension of the sulcular andjunctional epithelium was 1.9:t 0.8 mm for the GTR-group and 3.0:t 0.9 mm for the CPF-group (P=0.16). The new connective tissue ,!djacent to the root without cementum formation was 0.1 :t 0.1 and 0.8 :t 0.5 mm in the GTR-group and CPF-group, respectively (p=0.05). The new cementum formation observed was 3.8 :t 1.5mm and 2.4 :t 0.3 mm in the GTR-group and CPF-group, respectively (P=0.16). Bone formation was 1.1 :t 0.5 mm in the GTR-group and 1.4:t 0.2 mm in the CPF-group (P=0.53). Histologically, the defect coverage observed with the two techniques was similar, 90.6% and 91.9% for the GTR-group and the CPF-group, respectively. No statistical differences in any ofthe parameters evaluated could be detected. Within the limits of this study it can be concluded that both procedures resulted in a favorable healing response with no significant difference between the treatments

ASSUNTO(S)

periodontia odontologia

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