摘要:

&NA;Problems with crestal bone resorption and bone adaptation to dental implants in compromised and weak bone present clinical challenges due to insufficient bone volume. Mathematical models have shown that a new, square‐thread, dental implant design increases functional surface area and reduces shear loading at the implant interface.1The aim of this investigation was to evaluate the ability of bone to grow between the threads of the new implant and its general biocompatibility in a canine model. Test implants were placed in the mandibles of four beagle dogs after posterior partial edentulism. Three months after implantation, the animals received independent fixed partial dentures, were followed for an additional 6 months, and then euthanized for histological analyses. Analyses revealed that bone grew between the threads and closely apposed the new implant design. Histological observations also revealed that the inferior aspect of the test implant threads were apposed by more bone than the coronal aspect, suggesting a biological advantage for the compressive load transfer mechanism of the new implant design. The results of this study revealed that the new implant design became osseointegrated with bone growing between the threads of the device. (Implant Dent 2000;9:252‐260)

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

&NA;Unfavorable anatomical conditions of implant sites often require the insertion of implants in a direction that may interfere with the positioning of suprastructural elements in a functionally and esthetically satisfying manner. In some implant systems, bending of the implant neck is one of the possible methods for optimizing the insertion angle for the superimposed prosthesis. The aim of this study was to investigate whether bending procedures of the implant neck cause changes in the surface properties at the implant neck area. After bending of the implant neck up to 30 degrees, scanning electron microscopy revealed changes in the surface texture of the titanium. Superficial rips approximately 5 &mgr;m wide and 100 &mgr;m long had formed. These findings were confirmed by metallographic examinations. Values of Vickers hardness testing in the implant neck area after bending of 30 degrees showed significant differences between the compression or stretched zone and the neutral zone of the bending area. Bending of the implant neck between 0 and 20 degrees may influence the surface morphology, promoting superficial rips. Plaque accumulation and mechanically induced mucosal irritations due to changes of surface morphology and properties by bending should be further analyzed. (Implant Dent 2000;9:261‐267)

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;The reconstruction of the severely resorbed maxilla requires complex surgical treatment sequencing. Often, multiple grafting procedures are required either before or in conjunction with implant placement. Regardless of the surgical modality, the grafting procedures and the placement of implants in poor quality bone require undisturbed healing during which no pressure is placed on the grafted implant ridge. The use of transitional implants allows the surgeon to provide stable temporary prostheses throughout the healing phase, while preventing pressure from being placed on the grafted or implant reconstructed ridge throughout the maturation. These transitional implant‐supported temporaries allow the implant team to maintain vertical dimension, and they provide the patient with the benefits of implant‐supported restorations during the time leading up to final prosthetic reconstruction. (Implant Dent 2000;9:271‐277)

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

&NA;Implant‐related damage to an adjacent tooth is shown to be an iatrogenic complication. The affected tooth may require apical curettage, root canal therapy, apicoectomy, or even extraction. A case is presented of a patient who complained of damage to an adjacent root after implant placement. (Implant Dent 2000;9:278‐280)

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

&NA;The uses of conventional sinus augmentation procedures, trephines and osteotomes, with and without concomitant buccal‐lingual ridge augmentation are discussed. Indications and contraindications for the application of each therapeutic modality, material selection, and the appropriate timing of implant placement are detailed. (Implant Dent 2000;9:281‐287)

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