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Biomedical subjects

A Ashman

Publications and source records attributed to A Ashman.

At least 19 recordsLinked to original sources
PubMed1998

Five-year 224-patient prospective histological study of clinical applications using a synthetic bone alloplast.

Clinical and histologic evaluations of a synthetic bone were performed in 224 patients in a well monitored environment. This material (Bioplant HTR, Bioplant Inc., South Norwalk, CT) was used to obliterate cysts, treat periodontal defects, correct jawbone contours and deficiencies, and gain sufficient support for the placement of dental implants in maxillary subantral augmentation. Implants were positioned either at the time of the synthetic bone graft or after the new supporting tissue was formed. Evidence of new bone formation between the synthetic granules and host tissue was observed during histological examinations. After the material was placed, tissue that could strengthen and augment the inferior wall of the maxillary sinus formed in 3 months. This was observed both clinically and radiographically. After 8 to 12 months, this tissue provided sufficient hard tissue support for the placement of dental implants. This clinical study reconfirmed the applicability of a synthetic bone for bone replacement and augmentation in oral and maxillofacial surgery. No complications caused by infection, inflammation, or rejection of the implanted graft material were observed.

Adult↗
PubMed1997

Investigating the influence of achievement on self-concept using an intra-class design and a comparison of the PASS and SDQ-1 self-concept tests.

BACKGROUND: The formation and measurement of self-concept were the foci of this research. AIMS: The study aimed to investigate the influence of achievement on academic self-concept and to compare the Perception of Ability Scale for Students (PASS, Boersma & Chapman, 1992) with the Self-Description Questionnaire-1 (SDQ-1, Marsh, 1988). SAMPLE: The participants were 479 grade 5 (mean age 126.6 months) coeducational Australian students, located in 18 schools. METHOD: An intra-class research design was used to investigate the influence of frame-of-reference on self-concept development. RESULTS: As students' academic scores rose above their class mean their self-concepts increased and as students' academic scores fell below their class mean their self-concepts decreased. Students' difference from class mean predicted their self-concept scores. This finding was consistently shown across the reading, spelling, and mathematics domains using test and teaching rating data. A comparison between the PASS and the SDQ-1 demonstrated concurrent validity across self-concept domains. CONCLUSION: The findings support the notions that the social environment is a significant agent that influences self-concept, and that teacher ratings and standardised tests of achievement and the PASS and the SDQ-1 are valid measures for self-concept research.

Achievement↗
PubMed1995

Ridge augmentation for immediate postextraction implants: eight year retrospective study.

Implant placement immediately after tooth extraction has become a well accepted treatment modality. It is used to replace either a single tooth or several teeth in an edentulous ridge. Various augmentation materials are used to build up the edentulous ridge, to maintain it, and to prevent resorption upon extraction. The learning objective of this paper is to present an 8-year retrospective study of 55 screw-type implant placement in 40 patients, using an alloplast (mixed with autogenous blood) as the augmentation material. The paper reviews the progress of implant technology and describes the method and materials used in this particular study. Four cases are used to illustrate the simultaneous implantation and ridge augmentation procedure.

Adult↗
PubMed1995

Ridge preservation: the new buzzword in dentistry.

The viability of Ridge Preservation as achieved by practicing Advanced Extraction Therapy (AET) and Replacement Therapy (R.T.), will impact the future practice of Dentistry. With the availability of clinically proven materials such as implants (titanium) and synthetic bone substitutes (Bioplant HTR), a practical solution exists to solve a very old clinical problem. Treatment modalities are available today making the atrophic jaw-bone a malady of the past. Imagine no more "dental cripples," and no more inadequate bone situations for implant placements. Ridge Preservation and Replacement Therapy should be practiced regularly: "when we take something out, we should put something back." Our practices will grow. Our patients will thank us.

Alveolar Bone Loss↗
PubMed1995

The use of a particulate, microporous, calcified copolymer as a ridge maintenance device in dogs.

HTR polymer Synthetic Bone was found to be an osteoconductive, biocompatible, reliable nonresorbable matrix ridge maintenance material (Ridge Preservation). When used as socket implants immediately after the extraction of teeth over a one-year period in 16 beagle dogs, HTR was observed clinically and radiographically and compared with controls (unimplanted, sutured) extraction sites. As the control areas resorbed, the stability and effectiveness of the synthetic bone material in the operative sites became more clearly delineated. Quantitative analyses could not be made using radiographic techniques, but radiographs supported by subjective clinical observations as well as study casts taken of the height and width of the implanted areas, showed greater ridge retention compared with controls. Histological sections demonstrated dense laminar bone gradually forming into and around the HTR particulate material.

Alveolar Bone Loss↗
PubMed1994

Replacement therapy.

HTR Synthetic Bone's user friendly properties include: Hydrophilicity: holds clot and prevents its breakdown. Negative electric charge: adheres to bone and implant. Doesn't seem to get infected: less than one percent. Can graft to its surface: antibiotics or bone growth proteins for a slow timely release into adjacent areas. Does not require a barrier membrane with its use. Regenerating bone adheres to and is in direct contact with the HTR material. Has ability to attract the immature mesenchymal cell of the marrow that differentiate to osteoblasts: it is more than filler. Results in regeneration of bone three to four times as dense as bone regenerated by a barrier membrane/or as found in most normal dental alveolus.

Adult↗
PubMed1990

An immediate tooth root replacement: an implant cylinder and synthetic bone combination.

Tooth extractions in 22 cases were treated immediately with the simultaneous placement of a cylinder implant and injection of particulate synthetic bone around the neck of the implant and into the extraction socket surrounding the cylinder. Preliminary results indicate a success rate of 94.1% in those implant/synthetic bone combinations placed in function. The utilization of synthetic bone in combination with an implant creates the possibility of an immediate tooth root replacement. Besides replacing a "lost part" of the jaw immediately, this practice prevents the normal 40% to 60% bone loss that occurs in the two years post-extraction and improves both function and aesthetics for the patient. The synthetic bone, HTR Polymer, was used in combination with Steri-Oss cylinders.

Alveolar Bone Loss↗
PubMed1983

Personality profiles of pilots.

Samples of Air Force fighter pilots, trainee commercial pilots, and males drawn from the general community completed the Edwards Personality Preference Schedule (EPPS). Four significant effects were found for individual sub-scales; three (Achievement, Affiliation, and Nurturance) identifying air force fighter pilots. Commercial pilot trainees scored significantly less than the community sample on Succorance and Nurturance. The data suggest that the EPPS consists of several related personality dimensions. One of these, "sociability," discriminated fighter pilots from the general community.

Adult↗