ABSTRACT
The record base for a multiple, implant-supported, fixed prosthesis may be attached to the implants by screws. The screw attachment provides a stable record base for recording maxillomandibular relationships. Extraoral adjustment of the occlusion rim requires that it be unscrewed to allow removal from the mouth. The rim must be reattached with screws for the next intraoral evaluation. Although this cycle of removal and replacement provides stability, retention, and accuracy, it is time-consuming and inefficient. To resolve this problem, a two-piece record base/occlusion rim can be used. The screw-retained record base remains intraoral for the duration of the clinical appointment. The occlusion rim is designed to fit over the record base, with retention and stability, without screw retention. Use of the two-piece record base/occlusion rim facilitates convenient removal, adjustment, and replacement of the occlusion rim.
Subject(s)
Dental Prosthesis, Implant-Supported , Denture Design , Denture Retention/instrumentation , Denture, Partial, Fixed , Denture Bases , HumansABSTRACT
An implant-supported prosthesis is often secured to the underlying gold cylinders by retaining screws. There must be access to these screws from the oral surface of the prosthesis. Conventional preparation of this access is from the oral surface. This approach is difficult because the underlying gold cylinder is obscured. It may be damaged by a rotary cutting instrument as the access is prepared above it, because the cylinder cannot be seen during the preparation. Alternatively, the access hole may be unnecessarily enlarged in an attempt to find the cylinder. This loss of structure may weaken the prosthesis. A new approach, using 18-gauge stainless steel wire as a rotary cutting instrument, permits preparation of the access chamber from the intaglio surface of the prosthesis. This reduces risk of damage to the gold cylinder and is less destructive to the overlying material.
Subject(s)
Dental Prosthesis Retention , Dental Prosthesis, Implant-Supported , Bone Screws , Dental Prosthesis Retention/instrumentation , Dental Prosthesis Retention/methods , Gold Alloys , Humans , Prosthesis FittingSubject(s)
Dental Implantation/education , Dental Implants , Education, Dental , Prosthodontics/education , HumansABSTRACT
No standardized procedure is available for identifying the location of implants in the dental arch. For charting purposes as well as communication among dentists and other health professionals, a universally understood and accepted method is necessary. Such a procedure must be simple and conform to the different tooth designation systems. This article proposes the addition of the lower case letter "i" in each tooth designation system to provide a standard procedure for location of implant abutment position.
Subject(s)
Dental Implantation, Endosseous/methods , Dentition , Terminology as Topic , Dental Abutments , Humans , Patient Care PlanningABSTRACT
Removing a fixed partial denture may be an option as valid as surgery to treat patients who have subpontic osseous hyperplasia.
Subject(s)
Denture, Partial, Fixed/adverse effects , Hyperostosis/therapy , Mandibular Diseases/therapy , Female , Humans , Hyperostosis/etiology , Mandibular Diseases/etiology , Middle Aged , Remission InductionSubject(s)
Agar/chemistry , Alginates/chemistry , Dental Impression Materials/chemistry , Materials Testing , Powders , WaterSubject(s)
Tooth/anatomy & histology , Dental Restoration, Permanent , Esthetics, Dental , Humans , Odontometry , Tooth/pathologyABSTRACT
Forty-six tricuspid valve operations were performed over 12 years. Operations were conservative (two valvotomies, eight DeVega annuloplasties, seven Carpentier rings) in 17 and valve replacement (17 mechanicals, 12 tissues) in 29. Operative mortality rate was improved with better preoperative functional class, use of cardioplegia, or use of annuloplasty. Heart block occurred less with annuloplasty (6 vs 24 percent). Long-term survival was similar with annuloplasty or porcine valve replacement, but was poorer with mechanical valve replacement. Four of eight DeVega annuloplasties failed during the operative (two) or late (two) period. When the anatomy is suitable, we believe the Carpentier ring annuloplasty to be safe and effective. When valve replacement cannot be avoided, we believe replacement with a tissue valve is preferable.
