International Journal of Periodontics & Restorative Dentistry, 6/2020
DOI: 10.11607/prd.4571, PubMed-ID: 33151198Seiten: 907-916, Sprache: Englisch
The aim of this study was to describe the basal bone and alveolar process in the maxillary anterior region by assessing patient CBCT scans. Parasagittal reconstructions were made to quantify basal bone and alveolar process dimensions and inclination of teeth in the maxillary anterior region. The CBCT scans of 87 patients and 522 tooth sites were included in this study. The results showed that the surface areas of the basal bone, alveolar process, and palatal triangle varied from 22.1 to 54.1 mm2, 87.8 to 144.0 mm2, and 37.1 to 66.0 mm2, respectively. The basal bone in the canine region had a significantly smaller cross-sectional area than in the incisor region. The alveolar process in the canine region was markedly larger than those of the central and lateral incisor regions. The mean overall thickness of the alveolar facial bone at 3, 5, and 7 mm above the CEJ were 0.6 ± 0.5 mm, 0.9 ± 0.5 mm, and 0.7 ± 0.6 mm, respectively. Additionally, the findings demonstrated that the cross-sectional area of the alveolar process and palatal triangle were greater among men than women. The study identified significant anatomical differences among various tooth regions in the anterior maxilla. The results also demonstrated that the tooth type, but not the tooth inclination or apex location, correlates with the size of the alveolar process.
International Journal of Periodontics & Restorative Dentistry, 2/2008
PubMed-ID: 18546808Seiten: 123-135, Sprache: Englisch
The objective of the present experiment was to evaluate the effect on hard tissue modeling and remodeling of the placement of a xenograft in fresh extraction sockets in dogs. Five mongrel dogs were used. Two mandibular premolars (4P4) were hemisected in each dog, and the distal roots were carefully removed. In one socket, a graft consisting of Bio-Oss Collagen (Geistlich) was placed, whereas the contralateral site was left without grafting. After 3 months of healing, the dogs were euthanized and biopsies sampled. From each experimental site, four ground sections (two from the mesial root and two from the healed socket) were prepared, stained, and examined under the microscope. The presence of Bio-Oss Collagen failed to inhibit the processes of modeling and remodeling that took place in the socket walls following tooth extraction. However, it apparently promoted de novo hard tissue formation, particularly in the cortical region of the extraction site. Thus, the dimension of the hard tissue was maintained and the profile of the ridge was better preserved. The placement of a biomaterial in an extraction socket may promote bone modeling and compensate, at least temporarily, for marginal ridge contraction.