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The results of treatment of 230 patients with dentition defects are presented. Plate, arch, and removable bridge dentures were used fixed with a special clammer suggested by the authors. The follow-up has shown good functional and esthetic characteristics of the suggested denture designs.
Two-dimensional photoelastic models were used to determine the optimum design and loading conditions for a three-unit castable ceramic fixed partial denture. Findings relating to design and material variables can be summarized as follows. 1. Higher modulus cements impart more rigidity to the fixed partial denture design and result in lower stresses. 2. A short connector results in higher stress than a long connector; however, the length of the connector should not exceed one half the mesial-to-distal length of the pontic. 3. An intermediate thickness of cement results in the best stress distribution. 4. The male connector is best attached to the bulkier abutment. 5. Occlusal cement eccentricity is less desirable than cervical eccentricity. 6. The most undesirable loading site is directly above the connector.
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This article discusses current concepts of occlusion and describes the methods of creating a physiologic occlusion for the partially edentulous patient. Specific recommendations are made for choices of materials, techniques, and occlusal schemes for various edentulous situations.
This investigation was designed to evaluate the forces developed in supporting structures by removable partial dentures with attachment retainers. The attachments tested were the (1) Sterngold type 7, (2) Dalbo MK, and (3) Thompson dowel. The study utilized a photoelastic model with stress areas recorded photographically. The results showed that: 1. Splinted abutments are indicated when using the tested attachment retainers. 2. With single abutments, the attachment retainers induced distal force on the teeth which resulted in unfavorable horizontal bone forces. 3. The Dalbo MK attachments produced the most force on the edentulous regions and the least force on the abutment teeth. 4. The Thompson dowel and Sterngold type 7 attachment retainers induced similar stress patterns on single abutments and both produced distal abutment forces. 5. The Thompson dowel induced more favorable stress patterns when the abutments were splinted.
Two methods for interlocking the segments of fixed splints are advocated: (1) solderless joints where the connector occurs between adjacent abutment teeth and (2) a locking rod and tube attachment when the connector occurs in a pontic space. The locking rod and tube attachment was described. It allows complete independence of each segment. If problems occur in any segment of the splint, only that segment must be removed to make a repair. Other splinting techniques were presented along with their advantages and disadvantages.
An overview of the various locking types of semiprecision rests was presented along with several methods for their use in partial denture construction. By using the attachments selectively, the dentist should be able to direct the technician in their construction. All the types and systems presented serve the functions of retention, bracing, and support, which are the requirements for any removable partial denture retainer system.
This paper describes the surgical and restorative use of the Integral endosseous implant for overdenture stabilization with different types of retentive attachments. The clinical experiences of 90 overdenture patients with follow-up to 56 months postrestoration are discussed. With proper patient work-up, failure and morbidity has remained low.
Nonrigid connectors have been advocated for fixed partial dentures. However, space limitations may require overreduction of the preparation or overcontouring of the retainer to place the keyway within the retainer wall. An inverted orientation of the nonrigid connector can resolve these problems. With this design, the key is attached to the distal surface of the mesial retainer in a dual-abutment fixed partial denture, and the keyway is incorporated in the mesial surface of the pontic. This inverted orientation offers several advantages with few disadvantages.
OBJECTIVE: To investigate the effects of Mini-SG F attachment on periodontal health of the abutment teeth in restoring free-end removable partial dentures (RPDs). METHODS: The periodontal status of the abutments in restoring free-end RPDs was longitudinally observed with periodontal indices commonly used in clinics, and a group comparison was made using a one-way analysis of variance (ANOVA). RESULTS: The stability and retention of free-end RPDs retained by Mini-SG F attachments were excellent during the whole observation course. Compared with the periodontal status of the first and the second abutments before restoration respectively, no significant differences in gingival indices, plaque indices, periodontal probing depth, alveolar bone resorption levels of those were shown 6 months after restoration. The mobility of the abutments was significantly reduced when they were splinted together. CONCLUSION: Mini-SG F attachments used in free-end RPDs have no evident adverse effect on periodontal health of the abutment teeth, and the way of splinting the abutments is advantageous to their long-term health and stability.
This clinical report presents a restorative option for the partially edentulous maxilla utilizing an implant-retained removable partial denture without retentive clasps. This approach required (1) fewer patient visits and laboratory procedures; (2) the use of minimal number of implants; (3) lower financial obligations; and (4) no sinus elevation surgery. The use of O-ring attachments provided excellent retention and stability. The detachable prosthesis over implants allows easier oral hygiene by the patient and provides superior esthetics and phonetics in cases involving advanced ridge resorption.
The problem of achieving a common path of insertion for a fixed partial denture when a tilted posterior abutment is involved can usually be solved by well planned tooth preparation in conjunction at times with intentional endodontic therapy. When tooth preparation alone cannot solve the problem, the mechanical solutions of the locked attachment and the telescopic retainer are available and must be considered. Other problems involved with the tilted abutment, adjacent tilted teeth, space reduction, supraversion of the antagonist, and the problem of a long-span fixed partial denture were discussed.
A technique that uses processed bases to which the semiprecision attachments are attached intraorally has been described. The teeth are cured in heat-cured resin directly to the base. Advantages of using heat-cured processed bases are that (1) the base is accurately related to the attachments; (2) there is direct access to the attachments for joining them to the base; (3) extension, retention, and stability can be evaluated prior to completion of the dentures; and (4) accurate jaw relation recordings can be made due to the accuracy of the fit of the bases.
The aim of this retrospective study was to assess the long-term outcome of patients provided with implant-stabilised overdentures. Patients who had been entered into a previous trial were identified; the records were available for nineteen patients restored with conventional complete upper dentures and implant-stabilised lower overdentures. The mean follow-up period was 11.5 years (range 5.25-13.5 years). One implant was lost and all patients have successfully worn their prostheses, although most have experienced problems: loosening, loss and fracture of retaining clips, soft tissue complications and fractured bars. Nine patients subsequently had bars replaced with ball attachments. This conversion significantly reduced requirements for maintenance and professional care. Implant-stabilised lower overdentures supported on two implants provide a simple, predictable solution for patients with otherwise poorly retained and unstable lower dentures.
In the case report the overdenture prosthesis replacing the subtotal edentulousness is fixed by a Preci-Horix anchorage of individual design built on the tooth roots. The matrix portion of the anchorage was built in situ into the tooth plate of the denture. This aimes at preventing the disadvantageous overloading effect of the position change due to initial sinking of the denture on the support tooth.
Acid-etched fixed partial dentures are a rational alternative to other forms of removable prostheses because additional strength and increased resistance to fracture are achieved when the acrylic pontic is bonded with composite resin to natural tooth abutments.
16 caries-free partially edentulous patients were treated with 36 extracoronal adhesive attachments to support 4 removable partial dentures in the upper and 14 in the lower jaw. The cast nonprecious metal retainers were electrochemically etched and bonded with Superbond to the prepared abutment teeth. No debonding of the retainer occurred during the incorporation time of maximal 52 and minimal 3 months.