ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

&NA;Despite the predictions of some gloom casters, there is a strong economic future for dentistry. One of the ways to ensure this strength is to develop an enhanced integrated approach to the general practitioner/specialist referral system. This requires a planned marketing technique that draws the two practices—GP and specialist—into an alliance of greater understanding. (Implant Dent 2000;9:27‐29)

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

&NA;Grafting to restore lost alveolar bone is frequently used to enable placement of endosseous implants and improve cosmesis. Conflicting reports concerning the osteoinductivity of demineralized bone matrix (DBM) and historical use of synthetic bone graft substitutes has limited the use of DBM in oral and maxillofacial applications. Implant placement after bone grafting provides the unique opportunity to biopsy and histologically evaluate new bone formation. Bone grafting of the mandible or maxilla was performed to fill extraction sockets and restore ridge structures in a consecutive series of eight patients. DBM prepared as malleable putty (Grafton DBM Putty) or flexible sheets (Grafton DBM Flex) was used. Biopsies were taken at reentry, and histologic analysis determined the amount and quality of regenerated bone. Extensive new bone formation and minimal residual bone graft matrix were observed at an average of 5 months postoperative. The pattern of new bone maturity and remodeling varied by patient and the timein situ.Putty and Flex regenerated excellent bone height and width for the placement of dental implants, were easy to handle intraoperatively, and readily conformed to bony defects. (Implant Dent 2000;9:36‐44)

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

&NA;Bioactive cements based on calcium phosphate chemistry have been developed to serve as bone substitute materials. One such commerical product, BoneSourceTM, is a hydroxyapatite cement (HAC) used for small bone defects in the craniofacial complex. We have investigated the possibility that HAC could be used to support bone growth adjacent to dental implants placed in immediate tooth extraction sites. Variable levels of bone contact were noted up to 3 months postimplantation. Considerable loss of HAC occurred and was thought to be because of “washout” of the cement before complete cement setting. When HAC was immobile in the surgical site, the bioactive nature of the cement led to HAC resorption and bone deposition. Efforts to maintain the HACin situshould be expanded so that the full clinical potential of the HAC can be realized. (Implant Dent 2000;9:45‐50)

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

&NA;The effects of implant shape and size on the stress distribution around high‐strength silicon nitride implants under vertical and oblique forces were determined using a three‐dimensional finite element analysis. Finite element models were designed using as a basis the serial sections of the mandible. Using Auto‐CAD software, the model simulated the placement of implants in the molar region of the left mandible. Results of the analyses demonstrated that mainly the implant root shape and the directions of bite forces influence the stress distributions in the supporting bone around each implant. Implant size is a lesser factor. The serrated implants presented a larger surface area to the bone than either the cylindrical or tapered implants, which resulted in lower compressive stress around the serrated implants. With in creasing implant diameter and length, compressive stress decreased. The mean compressive stress distribution on the serrated implants was more flat (platykurtic) than on either the cylindrical or tapered implants. Results of studies on two load directions (vertical and oblique) showed that, in either case, the compressive stress in the cortical bone around the neck of the implant was higher than in the cancellous bone along the length of the implant. The most extreme principal compressive stress was found with oblique force. This study provides the first information on the relationship between shape of the silicon nitride implant and stress on the supporting bone. (Implant Dent 2000;9:53‐60)

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID