ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

Nine biomechanical factors involved in the design and fabrication of fixed partial dentures incorporating implants are discussed, focusing upon the deleterious effects of leverage, torsion, occlusal overload, and poor oral hygiene. Areas of concern are cantilevers, pier abutments, excessive fixed spans, use and misuse of nonrigid connectors, off-axis loading, occlusal plane to implant height ratio, inadequate support, distribution, and mandibular flexion and torsion. (Implant Dent 1993;2:221–242)

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:

In 1980 the Veterans Administration Cooperative Studies Program No. 147 initiated a multicenter, multidisciplinary clinical study to evaluate the use of alternative alloys for porcelain-fused-to-metal restorations. An investigation of interexaminer agreement was conducted after seven years utilizing three measures of reliability: percentage of exact agreement using a five-point scale, percentage of agreement using a dichotomous (satisfactory-unsatisfactory) scale, and [kappa], a statistic which is intended to measure agreement beyond what would be expected to occur by chance. Exact agreement on the five-point scale ranged from 77 to 99 percent. Percent agreement on the dichotomous scale was above 99 percent for all of the criteria. Kappa ranged from 0.56 to 0.91, indicating moderate to near perfect agreement among examiners. Reliability of the study evaluations reinforced the validity and significance of the findings. (Implant Dent 1993;2:245–249)

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

A limitation of the use of panoramic radiography in implant dentistry has been variations in patient positioning, which can produce dissimilar radiographs and is a serious problem in longitudinal investigations. Previous techniques to standardize panoramic radiographs have been cumbersome and technique sensitive. Bilateral helium-neon lasers were mounted on two-axis micrometer translation stages and projected as cross-hairs on a phantom skull. The cross-point of each pattern was superimposed on a facial soft tissue landmark on either side of the skull. Laser coordinates were recorded and an initial radiograph was produced for each of three experimental groups. Two investigators repeated radiographs for each group six times using the original settings. The radiographs were digitized and the variance calculated and compared using a video digital analysis program. Repeat radiographs were compared to the originals by superimposing each pair and measuring the variance in radiographic markers. The variance ranged from 0.1 to 2.2 mm with the experimental groups and from 2.5 to 38.7 mm with the control group. Repeated measures analysis of variance showed no statistical significance (P > 0.125) among each of the experimental groups using the laser system and a significant difference (P < 0.001) when the control group is included in the analysis. Variance for experimental groups was not significant between the examiners (P > 0.45). A laser repositioning system may have application in implant dentistry by standardizing panoramic radiographs for comparisons in long-term investigations. (Implant Dent 1993;2:251–256)

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 method for antral augmentation with a composite graft of freshly harvested iliac crest bone morrow and porous hydroxyapatite for implant placement is described. The volume, cellular type, participate composition, and density of the graft permit rapid implant placement and integration when compared with totally synthetic grafting procedures. A clinical report is presented. (Implant Dent 1993;2:257–262)

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID

摘要:

Histometric evaluations as a function of time were performed with zirconium implants during the healing period in 10 Wistar rats. The implants (7 mm × 1 mm × 0.1 mm) were placed in the right tibia of the animals. Five rats were killed after 14 days and the remainder were sacrificed 30 days after implantation. The tibiae were resected, radiographed, and embedded in poly(methyl methacrylate). Three cross-sections were obtained transverse to the major axis of each tibia. Osseointegrated tissue thickness, percentage of direct bone-to-implant contact, and osseointegrated tissue volume were evaluated for each specimen. Bone formation was observed on the surface of the implanted strip that was in contact with tibia marrow. This method is proposed for the evaluation of the first stage of healing of bone in contact with different implant materials subjected to various surface treatments. (Implant Dent 1993;2:264–267)

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

ISSN:1056-6163    

出版商:OVID    

年代:1993

数据来源: OVID