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 »  Home  »  Dental Implant 1
Dental Implant 1

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» The Significance Of Passive Framework Fit In Implant Prosthodontics: Current Status
By JDI editor | Published 02/2/2001 | Dental Implant 1 | Unrated
Saime Sahin, DDS, PhD, Murat C. Cehreli, DDS, PhD
Professor, Department of Prosthodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkey.
Research Assistant, Department of Prosthodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkey.

Absolute passive framework fit has not been achieved in the last three decades. There is no consensus but rather a number of suggestions regarding the acceptable level of misfit. In light of current knowledge, although there are claims that passive fit is a governing factor over the maintenance of osseointegration and implant success, there is a rising opposing trend in relevant literature. The materials and the techniques used for fabricating cast-frameworks are not dimensionally accurate and require further research and development. Obtaining a passive fit does not seem to be possible and may in fact be unnecessary.
» Survey of Clinical Members of the Association of Dental Implantology in the United Kingdom
By JDI editor | Published 01/24/2001 | Dental Implant 1 | Unrated
M.P. J. Young, BDS, D.H. Carter, BSc, MPhil, PhD, P. Sloan, BDS, PhD, FRCPath, FDS RCS (Eng), A.A. Quayle, LDS, FDSRCS (Eng), PhD
Units of Oral Surgery and Oral Pathology, Turner Dental School and Hospital, University of Manchester, United Kingdom.

The aims of this survey were to
  1. determine recruitment rates of active oral implantologists,
  2. establish the proportion of participants who carry out the surgical aspects of implantology,
  3. quantify levels of surgical activity,
  4. determine the type of qualifications held by this sample, and
  5. identify the location of implant activity of clinical members of the Association of Dental Implantology (UK).
Questionnaires were mailed to the 408 members of the ADI registered as clinical members of the ADI; data were collected between July 1998 and May 1999. A response rate of 66.9% was achieved. Active members increased markedly from 1985 to 1995. Surgical activity and clinical experience varied widely: 32.9% had placed 100 to 499 implants, 29.8% had inserted 1 to 49 implants, and 4.3% had inserted $2,000 implants. The total number of implants inserted by this sample could only be estimated (between 51,000 and 90,000). The majority of this sample possessed postgraduate qualifications, although only 2.6% possessed a degree in oral implantology. The data from this sample indicated that the recruitment rate to the ADI (UK) increased markedly between 1985 to 1995, after which it seems to have slowed down. Most of the respondents were involved in the surgical aspects of implantology, although the level of surgical involvement varied widely. The low incidence of postgraduate degrees in implantology might reflect the relatively limited opportunities currently available for such training in the UK.
» An Assessment of Implant Coverage in Dental Benefit Plans
By JDI editor | Published 01/20/2001 | Dental Implant 1 | Unrated
Linda J. Thornton, DDS, MS, FACP
Director, Graduate Prosthodontics, Temple University School of Dentistry, Philadelphia, PA, USA.

In the last 30 years, dental implantology has undergone widespread advances in technology and now complex, high - risk procedures are routine. Patients are becoming more vocal in their requests for this service from dentists in private practice and academic institutions. Unfortunately, although treatment modalities have improved, the cost for this service remains beyond the reach of the average patient. The purpose of this article is to assess the present status of implant coverage in dental benefit plans in the US.
» Effects of a Modified Sandblasting Surface Treatment on Topographic and Chemical Properties of Titanium Surface
By JDI editor | Published 01/18/2001 | Dental Implant 1 | Unrated
Dehua Li, MD, DDS, PhD,
Associate Professor, Dept. of Oral and Maxillofacial Surgery, Qindu Stomatological College, Xi’an 710032, P.R. China.
Baolin Liu, MD, DDS,
Professor and Chairman, Craniofacial Implant Center, Qindu Stomatological College, Xi’an 710032, P.R. China.
Yong Han, PhD,
Associate Professor, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, P.R. China.
Kewei Xu, PhD,
Professor and Dean, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, P.R. China.

A modified sandblasting surface treatment (a noncoating, roughening surface modification of dental implants) has been developed that will overcome the defects of conventional coating techniques. To verify the feasibility and reliability of this method at the chemical and topographic levels, scanning electron microscopy, x-ray diffraction, and a titanium ion releasing test were used; the topography of titanium surface, the embedding of sandblasting particles, nonpollution of heteroelements, and anticorrosiveness of titanium were criteria. Results showed that the rough surface created by sandblast was rather irregular, full of sharp tips and many embedded sandblast particles, and its corrosive rate was increased. These characteristics were modified by oxalic acid attack; the contour of the rough surface became more regular and round, the embedded particles and the heteroelement pollution were thoroughly removed, and the Ti corrosive rate decreased dramatically. Oxalic acid attack modification also created numerous secondary micropores (2.0-mm diameter) on the basis of sandblasted surface macrotexture. This modified sandblasting surface treatment is feasible and reliable to apply to dental implants and does not decrease the biocompatibility of titanium.
» Collagen Membrane Resorption in Dogs: A Comparative Study
By JDI editor | Published 01/15/2001 | Dental Implant 1 | Unrated
Kris W. Owens, DDS, MS
Postgraduate Periodontics Student, Dept. of Periodontics, Louisiana State University School of Dentistry, New Orleans, LA, USA.

Raymond A. Yukna, DMD, MS
Professor and Coordinator Postgraduate Periodontics, Dept. of Periodontics, Louisiana State University School of Dentistry, New Orleans, LA, USA.

Guided tissue barriers using materials such as collagen are used in the hope of excluding epithelium and the gingival corium from the root surface or alveolar bone to facilitate regeneration. Convention suggests that the longer a membrane remains intact, the better the regeneration results. The purpose of this study was to determine the resorption rates of various collagen membranes in the oral cavity of dogs. Twelve adult mongrel dogs had three different collagen membranes (BioGide, AlloDerm porcine-derived, and Allo-Derm human-derived) randomly inserted and secured into surgical pouches made in their palates. Full-thickness tissue punch biopsy specimens taken at 1, 2, 3, or 4 months after surgery were evaluated histologically for membrane intactness and other associated changes. At 1 month, all membranes had slight to moderate deg radation. At 2 months, all membranes had moderate to severe degradation with the exception of one AlloDerm human-derived membrane that was intact. At 3 months, all membranes had severe degradation to not identifiable. At 4 months, all membranes had severe degradation to completely absent. Blood vessel penetration varied from none to moderate. Inflammation was found in only two samples. In the dog, all three tested collagen membranes showed slight to moderate degradation at 1 month and were severely degraded to completely absent at 4 months. Within the limits of transferring animal data to humans, clinicians need to be aware of these resorption rates when selecting membranes for guided tissue and bone regeneration.

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