Presence of mast cells and the expression of metalloproteinase 9 in the gingiva of ovariectomized rats with periodontal disease.

Background: The host's answer has an important role in periodontal disease, and the mast cells have a prime role. Such cells seem to be influenced by estrogen deficiency. The objective was to evaluate the mast cells and the expression of metalloproteinase(MMP)-9 in periodontal disease induced in ovariectomized rats.

Evaluation of simulated external root resorptions with digital radiography and digital subtraction radiography.

Introduction: Root resorption can cause damage in orthodontic patients. Digital subtraction radiography (DSR) is a useful resource for the detection of mineral losses. The purpose of this study was to compare the efficacy of digital radiography (DR) and DSR in detecting simulated external root resorption.

Radiographic study of ossification of the pterygospinous and pterygoalar ligaments by the Hirtz axial technique.

The correct radiographic identification of ossification of the pterygospinous and pterygoalar ligaments plays an important role in surgical procedures for the treatment of trigeminal neuralgia. Most of these procedures are performed through the foramen ovale, a site where these ligaments can be found to be partially or completely ossified. We studied the radiographic features of these ossified ligaments and their location in relation to the foramen ovale by the Hirtz axial technique.

Femur bone repair in ovariectomized rats under the local action of alendronate, hydroxyapatite and the association of alendronate and hydroxyapatite.

Summary An evaluation was made of the local action of alendronate sodium (A), hydroxyapatite (HA) and the association of both substances (A + HA), in different molar concentrations, on the femur bone repair of ovariectomized rats. Ninety-eight animals were divided into seven groups: control (C), starch (S), alendronate 1 mol (A1), alendronate 2 mols (A2), hydroxyapatite 1 mol (HA1), hydroxyapatite 2 mols (HA2) and the association of alendronate + hydroxyapatite (A + HA). Rats weighing about 250 g were ovariectomized and 2.

In vitro incidence of root canal bifurcation in mandibular incisors by radiovisiography.

Objective: The aim of this study was to verify, in vivo and in vitro, the prevalence of root canal bifurcation in mandibular incisors by digital radiography.

Material And Methods: Four hundred teeth were analyzed for the in vivo study. Digital radiographs were taken in an orthoradial direction from the mandibular incisor and canine regions.

Anatomy of a dextrocardia case with situs solitus.

We present a rare case of dextrocardia in the corpse of a female child, aged approximately one year old, presenting situs solitus. The cases of dextrocardia reported in the literature normally describe multiple associated cardiac malformations. In the present study, it is noteworthy the fact that a complete specular image of the heart and the vessels of the base of the heart was not found.

Local action of sodium alendronate in bone repair of spontaneously hypertensive rat (SHR).

Background: The arterial hypertension is a disorder characterized by relevant alterations in the bone tissue. The sodium alendronate is indicated in the treatment of bone diseases, because of its affinity with the hydroxyapatite, inhibiting the bone reabsorptions.

Objective: To analyze local action of the sodium alendronate in the bone repair of spontaneously hypertensive rat (SHR).

Bone healing in drill hole defects in spontaneously hypertensive male and female rats' femurs. A histological and histometric study.

Objective: The aim of this study was to evaluate the bone healing in spontaneously hypertensive rats (SHR) and compare the results with normotensive rats, evaluating male and female animals.

Methods: A bone drill defect was created in the left femur of 24 SHR (12 males and 12 females) and 24 normotensive rats (12 males and 12 females). The animals were divided into two groups and sacrificed 7 and 21 days after the surgical procedure.