ISSN:1056-6163    

出版商:OVID    

年代:1995

数据来源: OVID

摘要:

This study evaluated the diagnostic accuracy of periapical, tomographic, and cross-sectional occlusal radiographic techniques in the assessment of facial and lingual bone loss at implant obscured sites. An edentulous dry human mandible was prepared with implants in the incisor, premolar, and molar regions. Successive round bur sizes (No. 1 to 6) were used to create circumferential infrabony periodontal defects in the alveolar crest adjacent to the implants. Periapical radiographs were made with custom stents and imaged each site in a conventional parasagittal orientation. Linear tomograms imaged sites in a cross-sectional coronal orientation. Cross-sectional occlusal radiographs imaged anatomy in the axial plane. Radiographic anatomy mesial and distal to each implant was masked with opaque tape before evaluation by a panel of six observers. Images were displayed in pairs consisting of an image at baseline and a second image having an equal chance of displaying an increment of bone removal or no bone removal. Image pairs were displayed in random order A five-point scale was used to evaluate accuracy of detection of the presence or absence of changes in bone density as well as observer confidence in that assessment. ANOVA demonstrated significant variation due to image modality and increment of bone removal. Cross-sectional occlusal views provided significantly greater mean observer confidence scores than either periapical images or tomograms (P < .01). However, tomograms may provide greater utility in actual clinical practice. (Implant Dent 1995;4:13–18)

ISSN:1056-6163    

出版商:OVID    

年代:1995

数据来源: OVID

ISSN:1056-6163    

出版商:OVID    

年代:1995

数据来源: OVID

摘要:

Alveolar bone resorption can result from tooth loss, periodontal disease, or trauma. Guided tissue regeneration is used in an attempt to exclude tissues devoid of osteogenic potential from a bone defect or cavity and promote new bone growth to replace missing osseous structure. Many types of barrier membranes have been used, but none have been found to be ideal for every clinical situation. Macroporous membranes, such as expanded polytetrafluoroethylene, require primary closure and a second surgical procedure for their removal. Macroporous membranes can incorporate bacteria and may become infected if exposed in the oral cavity. Membranes manufactured of resorbable polymers require primary closure of the augmentation site and exhibit variable patterns of resorption, introducing a degree of unpredictability into the procedure. The use of high-density polytetrafluoroethylene membrane to promote deposition of bone for ridge augmentation in the oral cavity is described. Two clinical reports are presented. (Implant Dent 1995;4:21–26)

ISSN:1056-6163    

出版商:OVID    

年代:1995

数据来源: OVID

摘要:

Endosseous dental implants are routinely used for the replacement of missing teeth. The CeraOne system uses a gold cylinder that is luted to a metal abutment. This study evaluated two luting agents and two luting techniques on the retention of a CeraOne gold cylinder to a CeraOne titanium abutment. A mechanical testing instrument was used to provide an uniaxial tensile force on the gold cylinder, which was cemented with zinc phosphate or Tempbond NE. The access opening to the gold abutment screw was filled or unfilled. Filling the access opening resulted in significantly higher retentive values (P < 0.01) compared to leaving the access opening unfilled. The gold cylinder was significantly more retentive when cemented with zinc phosphate as compared with Tempbond NE (P < 0.01). A Tukey post hoc test demonstrated that all means were significantly different at the P=0.01 level. The results suggest that the choice of luting agent and luting technique may affect retention of a CeraOne gold cylinder. (Implant Dent 1995;4:32–35)

ISSN:1056-6163    

出版商:OVID    

年代:1995

数据来源: OVID

摘要:

A special interest group meeting devoted to clinical educational programs in implant dentistry for undergraduate students was held in March 1994 at the annual session of the American Association of Dental Schools in Seattle, Washington. Summaries of the presentations of representatives from three United States dental schools and the moderator's introductory remarks are included in this article. (Implant Dent 1995;4:40–43)

ISSN:1056-6163    

出版商:OVID    

年代:1995

数据来源: OVID

ISSN:1056-6163    

出版商:OVID    

年代:1995

数据来源: OVID

摘要:

Extraoral force systems in orthodontics are dependent on patient cooperation. Endosseous implants that offer intraoral anchorage are being investigated, but the implant cannot be loaded for 4 months, is limited in placement by skeletal anatomy, and must be surgically removed. The purpose of this pilot study was to investigate an intraoral extraosseous implant used as an anchorage source. Titanium ramus implants were placed on the lateral surface of the left rami of 12 sheep. Clinical evaluations were made of implant stability and tissue condition. Bone changes were assessed at the time of killing, which ranged from 43 to 84 days. Infection was present in most animals at the time of killing. The implants were mobile in all animals, and the rami experienced considerable changes due to bone resorption and apposition. The results of this animal pilot study suggest that an intraoral extraosseous implant system such as that used in this investigation may result in bone resorption, implant mobility, and infection. (Implant Dent 1995;4:46–49)

ISSN:1056-6163    

出版商:OVID    

年代:1995

数据来源: OVID

摘要:

A technique is presented to evaluate the angulation and position of an anterior single tooth root form implant by means of a surgical template, a pilot osteotomy, and an abutment guide. The space available for the restorative materials can be assessed and the angulation modified, if necessary, to improve the esthetic potential. If the angulation is satisfactory and sufficient room is available for the prosthesis, the surgeon can continue with implant placement at the initial site. (Implant Dent 1995;4:52–54)

ISSN:1056-6163    

出版商:OVID    

年代:1995

数据来源: OVID

摘要:

Accurately recording implant positions and the edentulous areas during the fabrication of implant-retained overdentures can be a difficult task. A modification of the dual or split-tray technique is suggested for implant-retained overdentures. This procedure permits the construction of the prosthesis on one master cast and the use of two impression materials with different properties incorporated into a single impression to correspond with the needs of specific anatomic areas of the mouth. (Implant Dent 1995;4:57–60)

ISSN:1056-6163    

出版商:OVID    

年代:1995

数据来源: OVID