ISSN:1056-6163    

出版商:OVID    

年代:1997

数据来源: OVID

摘要:

The use of many currently available implant systems may be limited in patients with severe mandibular atrophy because of the lack of available bone in the symphyseal region. The transmandibular implant is a rigid box-frame structure that can distribute masticatory forces along a severely atrophied mandible with as little as 4 mm of vertical bone with an implant-borne prosthesis. Although the success rate of the transmandibular implant is favorable as compared with other systems, complications can occur after placement, including infection, partial extrusion, and fracture of a post. A case report of fractures of two posts at the necks and the bar approximately 18 months after placement is presented. (Implant Dent 1997;6:11–13)

ISSN:1056-6163    

出版商:OVID    

年代:1997

数据来源: OVID

摘要:

Rapid, accurate seating of screw-retained implant abutment heads, where timing is controlled by internal or external hex designs, can be readily accomplished with individual, custom-cast abutment head location devices. The devices are especially useful when the abutment head-implant body complex is to be permanently cemented. The use and design of abutment seating jigs for single tooth implants and completely implant or implant and natural tooth-supported prostheses are described. (Implant Dent 1997;6:14–16)

ISSN:1056-6163    

出版商:OVID    

年代:1997

数据来源: OVID

摘要:

Surface topography plays a critical role in the interaction of dental implants with adjacent tissues. No statistical differences in oxide composition and surface contamination were observed between 600 grit and polished titanium surfaces. The expression of osteoblast phenotype was enhanced when osteoblast progenitor cells (2T9) were stimulated with bone morphogenetic protein-2 on polished and 600 grit titanium surfaces. Bone morphogenetic protein-2 stimulated phenotypic expression on 600 grit titanium surfaces was marked by prolonged alkaline phosphatase specific activity and more rapid osteocalcin production as compared with the polished titanium surfaces. Because the surface area of the 600 grit titanium surface was shown to be 8 percent greater than that of the polished titanium surface, it is possible that increased surface area played a role in the enhanced expression of the osteoblast phenotype. (Implant Dent 1997;6:19–24)

ISSN:1056-6163    

出版商:OVID    

年代:1997

数据来源: OVID

ISSN:1056-6163    

出版商:OVID    

年代:1997

数据来源: OVID

摘要:

Fracturing or loosening of abutment and retaining screws is a frequent occurrence. This study was designed to evaluate the retaining ability of nine abutment systems. Abutment and retaining screws were secured to the appropriate implant using a digital torque gauge, with the abutment screws placed at 30 N-cm and the retaining screws at 10 N-cm. Removal torque was recorded three times for each sample 10 minutes after initial placement, 20 minutes after retightening, and 24 hours after retightening. There was no statistical difference in removal torque relative to time or repeated tightening. Of the nine abutment systems, three were statistically less retentive as compared with the most retentive system. The retaining screws were less retentive as compared with the abutment screws. For maximum retention the elimination of retaining screws from the restorative design and using 30 N-cm of torque for the abutment screws is suggested.

ISSN:1056-6163    

出版商:OVID    

年代:1997

数据来源: OVID

摘要:

A mandibular cuspid adjacent to two implants placed in the incisor region redeveloped periapical pathosis as a result of the inadvertent removal of the gutta-percha seal during post preparation. The root end inflammatory process communicated with the surface of an adjacent implant, resulting in endodontic-implant pathosis and subsequent removal of the implant. The osteotomy site healed uneventfully and almost complete osseous repair was observed after five months.

ISSN:1056-6163    

出版商:OVID    

年代:1997

数据来源: OVID

ISSN:1056-6163    

出版商:OVID    

年代:1997

数据来源: OVID

ISSN:1056-6163    

出版商:OVID    

年代:1997

数据来源: OVID

摘要:

SummaryGuided bone regeneration is an important aid in implant therapy. It is highly predictable if an established protocol is followed. Bone is regenerated, which withstands functional forces over time in a conventional manner.

ISSN:1056-6163    

出版商:OVID    

年代:1997

数据来源: OVID