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Biomedical subjects

M S Block

Publications and source records attributed to M S Block.

68 records · Page 4Linked to original sources
PubMed1986

Malignant fibrous histiocytoma in the maxilla: review of literature and report of a case.

This case report demonstrates the difficulty involved in establishing a diagnosis of malignant fibrous histiocytoma. The histologic characteristics of this tumor as well as the important contributions of electron microscopy and special staining techniques in making the diagnosis, have been discussed. Review of 16 cases of MFH revealed the typical presentation of maxillary sinus malignancy. Treatment modalities vary, depending on the size of the tumor and the preference of the surgeon.

Adult↗
PubMed1985

Healing of mandibular ridge augmentations using hydroxylapatite with and without autogenous bone in dogs.

Dog mandibles were augmented with either hydroxylapatite (HA) alone or HA combined with autogenous bone. Within the limited time frame of this experiment (16 weeks) the group which received HA alone did not demonstrate the induction of bony ingrowth further than 1-2 mm into the augmented ridge. However, the animals augmented with HA combined with autogenous bone demonstrated an active, lamellar-type bony ingrowth, maturing bony haversian systems, and vascular elements forming throughout the entire area, extending to the overlying soft tissue interface. The clinical assessment of both types of augmented ridges (HA and HA and bone) were similar; both formed hard, firm ridges at approximately the same rate. This observation is consistent with human clinical experience with HA or HA mixed with bone. However,for patients who have severe mandibular atrophy and for whom increased mandibular bony bulk is crucial, a combination of HA and bone should be advantageous because of the increased extent of bony ingrowth.

Alveolar Ridge Augmentation↗
PubMed1984

Proplast augmentation for posttraumatic zygomatic deficiency.

Facial deformities following fractures of the zygomatic complex are common. Included in this article are the indications, work-up, and surgical technique for placement of Proplast implant material to correct the deformity of the malunited zygomatic complex. Three cases are presented to illustrate this approach.

Accidents, Traffic↗
PubMed1984

Orbital decompression by midfacial advancement. Report of two cases.

Patients with midfacial deficiency and exorbitism may pose a difficult challenge for orbital decompression. This article presents a review of the literature and discusses patient assessment, treatment planning, and surgical approaches to correction. Two cases are reported, demonstrating orbital decompression by midfacial advancement via the classic LeFort III osteotomy and a modified LeFort III osteotomy.

Adult↗
PubMed1984

Long-term radiographic evaluation of hydroxylapatite-augmented mandibular alveolar ridges.

From six months to four years after alveolar ridge augmentation was performed, the vertical ridge heights of 74 Class III and Class IV alveolar ridge deficiency patients, who had undergone augmentation with hydroxylapatite with or without autogenous cancellous bone, were measured using panoramic radiographs adjusted for magnification errors. No statistically significant decreases in vertical ridge heights were seen when only hydroxylapatite was used, nor were there significant differences between the two types of hydroxylapatite particles used. Unlike other bone onlay procedures, the use of autogenous bone and HA together did not result in significant decreases in vertical ridge height.

Alveolar Process↗
PubMedDate not supplied

Hydroxyapatite-coated cylindrical implants in the posterior mandible: 10-year observations.

A total of 443 hydroxyapatite-coated cylindrical implants were placed into the posterior mandibles of consenting patients from July 1985 through December 1991. Implants were placed into ridges that had sufficient bone volume. Implants were also placed in ridges with thin bone, grafted bone, or immediate extraction sites, which occasionally resulted in increased morbidity. All were followed yearly with clinical and radiographic examinations. Life table analyses were performed using SAS software. Ten-year cumulative survival and nonmorbid (based on bone loss criteria) rates were determined for the four posterior tooth locations and for all posterior locations combined. Cumulative survival for implants was 0.858 +/- 0.056 in the first premolar region, 0.833 +/- 0.041 for the second premolar region, 0.785 +/- 0.041 for the first molar region, and 0.718 +/- 0.064 for the second molar region. When all posterior mandibular locations were taken together, the cumulative survival was 0.793 +/- 0.025. Cumulative nonmorbid rates were 0.816 +/- 0.056 for the first premolar, 0.729 +/- 0.049 for the second premolar, 0.600 +/- 0.046 for the first molar, and 0.507 +/- 0.066 for the second molar. The cumulative nonmorbid rate was 0.646 +/- 0.028 for all sites combined. Comparisons between sites indicated that the second molar site had statistically more morbidity than did the other three sites. Most of the problems were identified with 8-mm-long implants, especially in the second molar location. Clinical parameters, including the presence of keratinized gingiva and a hygienic restoration, were associated with survival. Both mechanical and inflammatory compromise were found to be reasons for implant failure.

Bicuspid↗
PubMedDate not supplied

Bone response to functioning implants in dog mandibular alveolar ridges augmented with distraction osteogenesis.

The specific aim of this study was to determine the response of alveolar bone after it was augmented vertically using distraction osteogenesis and subsequently loaded with implant restorations. Four dogs each had four implants placed horizontally into an edentulous mandibular quadrant and, after integration, a distraction osteogenesis device was fabricated in the laboratory. An osteotomy was made to allow the crest of the alveolar ridge to be distracted vertically. After 10 mm of vertical distraction, the device was stabilized with light cured resin. Following bone fill confirmation of the distraction gap at 10 weeks, two implants were placed into the ridges, one in distracted bone and one in nondistracted bone. After 4 months for implant integration, freestanding prostheses were fabricated. Crestal bone levels were evaluated throughout the period of function. Animals were sacrificed after 1 year of loading, for histologic evaluation of the bone. The vertical ridge augmentation averaged 8.85 +/- 1.05 mm after 10 weeks of healing following distraction, without change over 1 year of implant loading. Histologic examination showed that bone had formed between the distracted segments, creating an augmented ridge. The average thickness of the labial cortex in the distraction gap was significantly thinner than the lingual cortex in distracted bone and the lingual and labial nondistracted cortical bone. The presence of the dental implant did not significantly affect cortical bone thickness. Serial sections showed that implants remained integrated and functional without soft tissue inflammation. Dental implants placed into alveolar ridges augmented with the technique of distraction osteogenesis maintained bone and were functional for the length of this study.

Alveolar Ridge Augmentation↗