Biomedical subjects

W D Polido

Publications and source records attributed to W D Polido.

4 recordsLinked to original sources

PubMed1991

Bone resorption, stability, and soft-tissue changes following large chin advancements.

Large advancement genioplasties were performed in 10 patients (mean advancement, 11.7 mm) by horizontal osteotomy of the inferior border of the mandible, with preservation of a musculoperiosteal pedicle to the advanced genial segment. Preoperative, immediate postoperative, and long-term follow-up lateral cephalometric radiographs were retrospectively analyzed to evaluate the osseous and soft-tissue changes of the chin. After a mean follow-up period of 15 months, 76% of the initial advancement was preserved, representing 24% osseous resorption. The enveloping soft tissues of the chin followed the bony movement in a ratio of 1:0.88. Horizontal osteotomy of the inferior border of the mandible was a relatively stable procedure when used for large chin advancements. The broadcast possible musculoperiosteal pedicle should remain attached to the advanced genial segment to minimize osseous resorption and to achieve more predictable soft-tissue changes.

Adolescent↗

PubMed1991

An assessment of the predictability of maxillary repositioning.

The purpose of this investigation was to compare our ability to perform the surgery that is planned in the prediction tracing and model surgery when using the mandible as a guide to maxillary repositioning, using internal and external reference points to establish the vertical dimension at the time of surgery. A total of 146 consecutive patients who underwent maxillary repositioning by means of Le Fort I osteotomy were selected. In all patients the unoperated mandible was used to provide anteroposterior and transverse maxillary position. In 100 patients, measurements made on the lateral wall of the maxilla (internal reference points--IRP) were used to determine the maxillary vertical dimension. In 46 patients, the vertical dimension was established by measuring between a Kirschner wire in the nasal bridge and a maxillary incisor (external reference points--ERP). Comparison between the predicted and actual change in the position of the incisor was calculated. Statistical analysis showed that there were significant differences between the predicted and actual change in vertical and horizontal position of the incisor (p less than 0.0001) for both experimental groups. However, there was a significant difference between the 2 experimental groups (p less than 0.001) for the accuracy of vertical repositioning. The use of an external reference point proved to be a more accurate method for vertical maxillary repositioning. The results of this investigation indicate that the ability to determine vertical repositioning of the maxilla with internal reference lines is limited.

Bone Nails↗

PubMed1990

An assessment of the predictability of maxillary surgery.

The purpose of this investigation was to determine the ability to perform the surgery that is planned based on the prediction tracing and model surgery when using the mandible as a guide to maxillary repositioning and internal reference points to establish the vertical dimension at the time of surgery. One hundred consecutive patients who underwent maxillary repositioning by means of Le Fort I osteotomy were selected. In all patients the unoperated mandible was used to provide anteroposterior and transverse maxillary position and measurements made on the lateral wall of the maxilla (internal reference points, IRP) to determine the maxillary vertical dimension. Tracings of all cranial structures were made of the preoperative cephalograms and superimposed on the postoperative cephalogram and on the prediction tracing using cranial base structures. Points were digitized to compare the preoperative, postoperative, and predicted position of the maxillary central incisor and first molar of each patient by computer. Comparison between the predicted and actual change in the position of the incisor and molar was calculated. Statistical analysis showed that there were significant differences between the predicted and actual change in vertical and horizontal position of both the incisor and the molar (P less than .0001). The results of this investigation indicate that the ability to determine vertical repositioning of the maxilla with internal reference lines is limited.

Analysis of Variance↗

PubMedDate not supplied

[Lipoma].

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Humans↗