ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

The various proposed etiologies for root intrusion in tooth-implant combination cases are discussed. Clinical examples of root intrusion are illustrated. Advantages and disadvantages of nonrigid connector and coping/suprastructure techniques are presented. (Implant Dent 1993;2:79–85)

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

Fabrication of a removable implant-supported prosthesis was complicated by the use of multiple implant systems as described in this clinical report. The management of associated treatment problems is discussed. (Implant Dent 1993;2:88–90)

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

Existing flap designs can be modified to improve esthetics in resorbed anterior maxillary edentulous areas when single implants are treatment planned. A clinical report is presented. (Implant Dent 1993;2:93–96)

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

A technique for the transfer of diagnostic information from transaxial CT scans to diagnostic casts is presented. A duplicate of the patient's existing prosthesis is utilized as a custom tray and an impression of the edentulous arch is made. The data from the transaxial radiographs are transferred to the diagnostic cast using anatomical landmarks as reference points. The marked cast can be used by the surgeon and the restorative dentist for optimal implant placement. (Implant Dent 1993;2:97–99)

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

Artificial cross-shaped intrabony defects were created in the mandibles of 12 rabbits and the cavities covered with Type I highly cross-linked resorbable collagen membranes for 30 days. Similar cavities were prepared in three control animals and left uncovered for the same time period. Morphological and analytical data were obtained by means of light microscopy, scanning electron microscopy, and x-ray energy-dispersive spectrometry. After the experimental period, the membrane covered cavities were completely filled with regenerated bone. In the control specimens, the artificial cavities were occupied by fibrous connective tissue. (Implant Dent 1993;2:101–105)

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

Parametric three-dimensional finite element studies were conducted on the Hader bar to determine mechanical properties with respect to bar length, stiffener height, and material properties. Three bar lengths (6, 12, and 18 mm) were analyzed with a 1-mm stiffener height. For the longest bar length (18 mm), two additional stiffener heights were evaluated (2 and 3 mm). In addition, three material types were studied for each of the design cases which represented a selection of alloys commonly used clinically. The model consisted of a representative Hader bar which was constructed of a bar of 1.8 mm diameter. The ends of the bar were fixed to a 2.5-mm diameter coping which was attached to a 1.8-mm diameter root form-type implant, rigidly fixed in a representative block of bone. The bone was modeled as fixed at its distal end to eliminate rigid body motion. A 200-Newton occlusal force was modeled as being transmitted through one, two, or three attachment clips, 5 mm in length, for the three respective bar lengths. The results of these analyses did not predict yielding (failure) for any of the cases studied. Span length and stiffener height were found to play a stronger role in the adequacy of the overall design as compared with changing material properties in the range of alloy stiffness tested. For the span length studies, factors of safety, with respect to static yield strength, ranged from 2.93 to 10.3 arid fatigue factors of safety ranged from 1.41 to 3.36. Parametric evaluations of the effect of stiffener height on failure potential resulted in static yield strength factors of safety ranging from 2.91 to 10.9. Fatigue and shear factors of safety for this series ranged from 1.65 to 5.47 and 2.29 to 10.5, respectively. A factor of safety of five or greater is suggested for Hader bar design. Caution is therefore indicated in the use of several of the systems, particularly under aggressive dynamic and/or high-magnitude (ie, > 200 Newtons) loading conditions if smaller diameter bars are used. (Implant Dent 1993;2:107–114)

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

With the increasing use of titanium in dentistry, the methods for maintenance, particularly the polishing sequence, have become especially important. Thirty test samples of commercially pure grade 2 titanium were sandblasted with 110 μm aluminum oxide at 60 psi to establish a baseline surface roughness. Two samples were exposed to each of 15 different polishing sequences. Scanning electron photomicrographs of the polished samples were taken at x 100 and randomly assigned identification numbers. The photomicrographs were evaluated and ranked by six dentists for surface smoothness. The best surface polish was obtained with the following sequence: aluminum oxide stone, green Flexie rubber abrasive wheel, white Flexie rubber abrasive wheel, flour of pumice on a wet rag wheel, buffing bar compound on a felt wheel, rouge on a felt wheel, and rouge on a chamois wheel (Implant Dent 1993;2:117–121)

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

Radiographic follow-up of dental implants is one of the most important clinical parameters a practitioner can assess. Recent advances in the design of panoramic radiograph machines have increased their potential use in the longitudinal clinical evaluation of dental implants. Changes from the earliest designs allow for a projection geometry that more closely approximates the shape of the human jaw. The fundamentals of panoramic radiography are reviewed including common errors in patient positioning, their effect on the radiographic image, and how to correct the errors. Comparative advantages and disadvantages of intraoral periapical and bitewing films as compared with panoramic radiographs are discussed, specifically focusing on the amount of radiation exposure, ability to detect bone loss/bone defects, and inherent problems with both systems. (Implant Dent 1993;2:122–130)

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID