Early root alterations after orthodontic force application studied by light and scanning electron microscopy.

The purpose of the study was to characterize root surface alterations in orthodontically moved teeth. Thirty-six 40-50-day-old male Wistar rats were used. The maxillary right first molar was mesialized by means of a fixed appliance, exerting 50 g of force upon insertion.

Bacterial colonization associated with fixed orthodontic appliances. A scanning electron microscopy study.

This investigation was undertaken to assess bacterial plaque accumulation adjacent to orthodontic brackets. Experiments were carried out on 11 subjects who were scheduled for orthodontic treatment including extraction of two or four premolars. Metal brackets were bonded to the premolars to be extracted using macro-filled bonding composite.

A radiographic comparison of apical root resorption after orthodontic treatment with a standard edgewise and a straight-wire edgewise technique.

The purpose of this study was to compare the severity of apical root resorption occurring in patients treated with a standard edgewise and a straight-wire edgewise technique, and to assess the influence of known risk factors on root resorption incident to orthodontic treatment. The sample consisted of 80 patients with Angle Class II division 1 malocclusions, treated with extraction of at least two maxillary first premolars. Variables recorded for each patient included gender, age, ANB angle, overjet, overbite, trauma, habits, invagination, agenesis, tooth shedding, treatment duration, use of Class II elastics, body-build, general factors, impacted canines, and root form deviation.

Microvascular system of the rat incisor enamel organ. A scanning electron microscopic study of vascular corrosion casts.

The rat incisor is a commonly used model in studies of tooth eruption, amelogenesis and effects of mechanical loading on the dental and periodontal tissues. The purpose of this study was to assess the three-dimensional architecture of the microvascular bed of the rat incisor enamel organ, to describe the direction of blood flow, and to provide a histometric assessment of the vascular categories that can be statistically analyzed. Vascular corrosion casts were prepared and examined by scanning electron microscopy.

Microvascular adaptation to transmucosal implants. A scanning electron microscopic study in the rat.

The profuse gingival microvasculature surrounding natural teeth has a unique architecture that contributes to the biologic seal and the anti-infective defense in the sulcular region. This study tested the hypothesis that this characteristic vascular arrangement is not replicated when gingival tissues adapt to a transmucosal implant. In 20 4-week-old Wistar rats, the upper first molar was extracted bilaterally and the gingiva at this site excised.