ISSN:1056-6163    

出版商:OVID    

年代:1994

数据来源: OVID

摘要:

The preload concept proposes that an optimal torque exists to which implant prosthetic retaining screws should be tightened. According to this theory, the preload prevents separation of implant components, thus protecting the screw from fracture. Recent research suggests that most implant-retained prostheses in function today were placed using improper preloads. The purpose of this investigation was to determine whether or not improper preloading of prosthetic implant-retaining screws would adversely affect their ultimate tensile strength. Fifteen Nobelpharma-slotted gold screws from one lot were tightened to 6, 10, and 15 N/cm with a torque gauge and ultimate tensile strength values determined. The procedure was duplicated using 15 Nobelpharma gold screws from another lot tightened to 0, 10, and 20 N/cm. Within each of the test groups, there was no significant difference in the ultimate tensile strength among the three preload torques. However, a paired t test (P = 0.005) determined that there was a significant difference between the two lots with respect to the ultimate tensile strength of the screws preloaded to 10 N/cm. Altering the preload torque applied to Nobelpharma gold-retaining screws does not affect their ultimate tensile strength. The ultimate tensile strength of the screws from the two lots differed, suggesting an unannounced change in component specifications. (Implant Dent 1994;3:17–21)

ISSN:1056-6163    

出版商:OVID    

年代:1994

数据来源: OVID

摘要:

Sinus lift and augmentation procedures with simultaneous insertion of cylindrical root form implants can be used to treat the atrophic posterior maxilla. The long-term use of a second stage provisional prosthesis is emphasized. The recommended metal-reinforced acrylic resin provisional restoration allows treatment and/or removal of a failing implant and progressive loading before fabrication of the definitive prosthesis. Modifications in prosthesis fabrication after sinus lift surgery and augmentation procedures are discussed. (Implant Dent 1994;3:24—28)

ISSN:1056-6163    

出版商:OVID    

年代:1994

数据来源: OVID

ISSN:1056-6163    

出版商:OVID    

年代:1994

数据来源: OVID

摘要:

A technique is described for the fabrication of a full arch maxillary passive-fitting, screw-retained, rigid ceramometal prosthesis. The two posterior segments containing Screw-Bloc attachments are cast initially. The waxed anterior segment with its attachments is then aligned to the cast posterior segments and cast. Porcelain is fired to the individual segments in an attempt to reduce deformation, which occurs when large ceramometal restorations are constructed. When the prosthesis is completely fabricated, the segments are assembled on the master cast and the attachments on the posterior segments are tapped to receive the screws, which rigidly attach them to the anterior segment. The Screw-Bloc attachment has an irregular configuration that resists rotation of the individual segments. The segments are united once the passively aligned screws are tightened. A clinical report is presented. (Implant Dent 1994; 3:31–34)

ISSN:1056-6163    

出版商:OVID    

年代:1994

数据来源: OVID

摘要:

A mixture of demineralized freeze-dried human cortical bone and resorbable tricalcium phosphate was used in conjunction with an expanded polytetrafluoroethylene membrane to promote deposition of bone for ridge augmentation. A titanium screw was used to prevent collapse of the regenerative materials. A clinical report is presented in which an atrophic ridge was reconstructed buccolingually, permitting the placement of a root form implant in a previously untenable site. (Implant Dent 1994;3:35–37)

ISSN:1056-6163    

出版商:OVID    

年代:1994

数据来源: OVID

摘要:

A technique is described for utilization of the augmented incisive canal as a recipient site for a root form implant. A mixture of four parts of demineralized freeze-dried bone and one part of tricalcium phosphate is used as the augmentation material. Preliminary case reports are presented that describe the placement of an implant adjacent to an augmented canal and in the incisive canal in conjunction with implants placed in newly formed bone following a sinus lift procedure. Long-term clinical evaluation of this new procedure is necessary to justify its use. (Implant Dent 1994;3:38—41)

ISSN:1056-6163    

出版商:OVID    

年代:1994

数据来源: OVID

摘要:

The prosthodontic implementation of the concept of progressive bone loading for root form implants is addressed. The use of transitional prostheses of acrylic resin with reinforced cast substructures are utilized to promote progressive prosthetic transference in arches with as few as three remaining natural roots. Progressive prosthetic transference is a clinical execution of biologic, biomechanical, and physiologic principles that are compatible with the needs to foster and maintain osseointegration. (Implant Dent 1994:3:42–46)

ISSN:1056-6163    

出版商:OVID    

年代:1994

数据来源: OVID

摘要:

Cannon burs with only one cutting surface and round burs with multiple cutting surfaces were evaluated in preparing bone sites for root form implant placement in five Macaca fascicularis monkeys. The cannon burs did not appear to produce a bone surface more conducive to osseointegration than the round burs. Bone cutting bur designs utilized in implant dentistry should be extensively evaluated and compared. (Implant Dent 1994;3:47–50)

ISSN:1056-6163    

出版商:OVID    

年代:1994

数据来源: OVID

摘要:

Quality control procedures of implant manufacturers are of concern to the profession, as a number of companies claim that their components are interchangeable with those of competitive systems. The external hex dimensions of six implant systems were measured and the ranges and coefficients of variance determined. Smaller ranges and coefficients of variance suggest better quality control. The results indicated a considerable difference in the quality control at implant manufacturing companies. (Implant Dent 1994;3:51–53)

ISSN:1056-6163    

出版商:OVID    

年代:1994

数据来源: OVID