Publications by authors named "Stephen M Parel"

Maxillary complete arch fixed implant-supported prostheses are a popular treatment option for edentulous patients. Excessive gingival display or gummy smile in edentulous patients is relatively uncommon. However, many partially edentulous patients or completely dentate patients with compromised dentition and excessive gingival display may seek a fixed implant-supported prosthesis.

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Statement Of Problem: There is debate as to the efficacy of maxillary complete arch reconstructions when only 4 implants are used.

Purpose: The purpose of this study was to determine what risk factors, if any, may increase the likelihood for implant failure in immediate function by using a tilted distal, 4-implant approach in the maxilla.

Material And Methods: A retrospective analysis of implant performance was conducted for patients treated with 4 implants placed in 285 maxillae (1140 implants) and 273 mandibles (992 implants) providing immediate function for complete arch implant-supported prostheses.

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The use of full arch alveolar reduction as an aide to doing All on 4 implant restoration in the mandible is presented. The osteoplasty is described as a flat "shelf" on which to place the restoration. The shelf approach is used to establish optimal implant position and angulation as well as to define anatomy to maximize implant fixation for immediate load prosthetics.

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All-on-4 treatment is facilitated by bone reduction to create prosthetic restorative space, establish maximum anterior posterior spread of implants, and to avoid pneumatized sites. Unlike a reduction alveloplasty for denture placement, the All-on-4 shelf enables optimal surgical prosthetic management of implant placement for the fixed hybrid prosthesis.

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Purpose: A common problem associated with implant-supported prostheses is the fracture of denture teeth. This study was designed to compare the fracture modes of three denture teeth by compressive load at a 30 degrees off-axis angle.

Material And Methods: Three denture teeth (Vident Duostat, Ivoclar Vivadent, and Dentsply Trubyte) processed to two denture base processing systems [injection-molded (IM) SR-Ivocap system and compression-molded (CM) denture base resin] were evaluated.

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A patient underwent immediate implant placement and immediate provisional restoration with nonocclusal loading in the right central incisor area. A provisional custom abutment and a cemented provisional restoration were fabricated. At the impression appointment, an implant level impression was made and the provisional abutment was scanned for fabrication of the definitive custom abutment.

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Purpose: To evaluate the clinical efficacy of a new 1-piece implant in single tooth sites.

Materials And Methods: Early clinical results were evaluated through observation and collection of survival data for 45 1-piece Direct implants (Nobel Biocare, Yorba Linda, CA). Patients ranged in age from 19 to 54 years, of which 23 were women and 12 were men.

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Purpose: This review describes a new interactive imaging program that allows computed tomography (CT) images to be used to virtually place dental implants and construct a precise guide splint and final prosthesis for delivery at the time of implant placement.

Materials And Methods: Patients with edentulous arches were recruited to participate in a trial program to assess the feasibility of using CT images in a 3-dimensional image-based program (Oralim; Medicine NV, Belgium) for planning and placing dental implants. Patients meeting the criteria received a CT of the appropriate arch using a denture with radiopaque markers indexed to the opposing arch.

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The Brånemark Novum protocol for immediate functional loading of a mandibular fixed implant-supported prosthesis has been an effective alternative for selected patients. In the event of the loss of an implant, a rescue set that allows continuous use of the original fixed restoration while restoring tripod osseointegrated support at the implant level is available.

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While the Novum system does not offer a solution for immediate loading and restoration of mandibular implants in all patients, it is a valuable treatment option for many individuals. Although the surgery is precise and labor intensive, the fact that no additional (stage 2) surgery is necessary, and that a definitive restorative outcome is possible in a single working day, makes this an appealing treatment option. Current results with this technique in the United States are favorable but short term.

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This new implant technology is part of the Procera product line (Nobel Biocare), and is available through a growing network of dental laboratories. It offers the possibility of a consistently excellent passive fit compared with conventional casting techniques, and essentially eliminates the labor intensive process of sectioning and soldering sometimes associated with gold alloy castings. Eliminating the distortion commonly associated with multiple firings of long-span ceramic restorations is also a significant benefit.

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The Novum System offers a unique opportunity to create a definitive, immediately loaded fixed prosthesis on the edentulous mandible for patients who meet specific presurgical criteria. Since this system is based on precisely placed implants and prefabricated bar structures, the surgical techniques are critical in obtaining a satisfactory result. It is especially important that the bone reduction required to create space for the implants and bar assembly be in the proper plane and deep enough to leave room for eventually setting and processing teeth.

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