[Removable partial dentures in maxillofacial prosthetics].
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Adolescent↗
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Results for “Denture, Partial, Removable”
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[Surface stress analysis of distal extension removable partial denture retained with two types of semi-precision attachments].
OBJECTIVE: The aims of this study are to analyze the surface stress of the periodontal supporting bone of the bilateral distol extension removable partial denture which is retained by using intra-coronal or extra-coronal semi-precision attachment, and to characterize the biomechanics of these two designs by using a strain gauge. METHODS: A fresh human mandible specimen with 76|67 missing and six bilateral partial removable denture retained with six semi-precision attachments were made, including three attachments with intra-coronal studs and three attachments with extra-coronal vertical bars. A total of six 45 degrees rosette strain gauges were bonded at six prepared points on the surface of the mandible to measure the surface stress, including the middle point between 76 of the buccal edentulous alveolar crest area under the denture base verge(point 1), the distal buccal cervix of 5 (point 2), the buccal apical area of 5 (point 3), the buccal middle area of 34 roots (point 4, 5), the lingual middle area of 5 root (point 6). The static loads of 14N, 28N and 42N were applied vertically, buccally 45 degrees, lingually 45 degrees at the middle point of the 6|6 occlusal surface. The micro-strain was recorded, and the maximal/minimal principle stresses were calculated for each RPD and each point. The stress characteristics of these two types of attachments were compared and analyzed. RESULTS: In most situations, the stress of these two semi-precision attachments showed significant differences. The vertical load: The stress values of these intra-coronal and extra-coronal attachments at points 1, 2, 3, 4, 6 differed significantly(P < 0.05), including points 1, 2, (sigma intra < sigma extra) and points 3, 4, 6(sigma intra > sigma extra). Buccal loads: The stress values of these intra-coronal and extra-coronal attachments at points 1, 2, 3, 4, 5 differed significantly(P < 0.05), including points 1, 2(sigma intra < sigma extra) and points 3, 4, 5(sigma intra > sigma extra). Lingual loads: The stress values of these intra-coronal and extra-coronal attachments at points 2, 3, 4, 6 differed significantly (P < 0.05, sigma intra > sigma extra). The intra-coronal attachment generally produced higher stress at the site of the alveolar bone around the abutment than the extra-coronal attachment, but extra-coronal attachment produced higher stress at the edentulous alveolar crest and the distal cervical alveolar bone of the distal abutment than the intra-coronal attachment. CONCLUSION: The intra-coronal attachment is suggested to be applied in some cases that the periodontal condition of distal abutment was good, and the extra-coronal attachment is suggested to be used in some cases that the condition of the edentulous alveolar crest is fairly good, while the periodontal condition of the distal abutment was relatively weak.
Adult↗
Design variations of the rotational path removable partial denture.
The rotational path removable partial denture is a convenient design to use when restoring anterior edentulous spaces and can produce excellent esthetic results. In situations that are not ideal for the conventional rotational path, design alterations can be made that will allow the same excellent results to be achieved.
Denture Design↗
The segmented framework removable partial denture.
The segmented framework removable partial denture is made of two cast metal individual segments joined with a resin major connector. The small individual framework segments can be made to fit well and the design permits ready correction of the tissue surface of the major connector through relining or an altered cast procedure. The dentist is offered a valuable alternative treatment approach in selected patients.
Acrylic Resins↗
Stress distribution of abutments and base displacement with precision attachment- and telescopic crown-retained removable partial dentures.
Five types of removable partial dentures (two attachment dentures, two telescopic dentures and one clasp denture) were designed. The two attachment dentures were retained by the rigid-precision attachments with or without a stabilizing arm, and the two telescope dentures were retained with cone telescope crowns with or without cross-arch stabilization. The stresses acting on abutment teeth and denture bases and the movements of denture bases were investigated, and the influences of denture design were clarified. The stress acting on a terminal abutment tooth retained by a rigid-precision attachment or cone telescopic crown was larger than that acting on a terminal abutment tooth retained by a clasp. The attachment dentures tended to concentrate more stress at the terminal abutment tooth than did the telescopic dentures. The stress of denture base of an attachment denture and a telescopic denture was less than that of a clasp denture. There was no difference between the stresses of attachment and telescopic dentures. The displacement of the denture base tended to be less when the denture was designed with a rigid connection for the retainer and with cross-arch stabilization.
Dental Abutments↗
Aesthetic clasp design for removable partial dentures: a literature review.
Removable partial dentures (RPD) are an effective and affordable treatment option for partial edentulism. If the main reason for seeking treatment is the need for improved aesthetics, treatment should be geared towards achieving this goal. This article is the result of a literature study on aesthetic clasp design for the conventional RPD. In this context, the position of the clasp on the tooth, clasp types, clasp material and alternative methods of retention are reviewed. Although published in reputable journals, the authors report that many articles published on this subject are of a descriptive nature and lack scientific evidence. Therefore, clinicians are encouraged to be critical in their interpretation of literature and the application of published information in their clinical practices.
Dental Clasps↗
Removable partial denture production in Scotland.
Removable partial denture production in Scotland was studied by analyzing photographs taken of consecutive casts and dentures and reviewing prescriptions of 539 cases at a large dental laboratory. Of the casts, 70.4% were maxillary and 29.6% mandibular. The mean number of teeth present was 9.9 in the maxilla and 8.4 in the mandible. Of the partial dentures studied, 33.6% were acrylate dentures without any framework. None of these had occlusal rests, and 5.6% had clasps. Of the framework-retained maxillary dentures, the palatal strap (12.9%), horseshoe (15.8%), and anterior palatal bar (18.9%) designs were the most frequent. In the mandible, lingual bars (32.7%) and lingual plates (32.7%) predominated. Of the acrylic dentures, 89.3% were made without any instruction from the dentist. The corresponding figure for prostheses with cobalt-chromium frameworks was 15.0%.
Denture Design↗
The swing-lock removable partial denture.
The swing-lock removable partial denture is a good treatment alternative for maxillofacial prosthodontics, periodontally compromised dentitions and where some conventional designs for removable partial dentures cannot be applied. This paper presents clinical applications of the SLRPD. Indications, contraindications, advantages and disadvantages are discussed.
Contraindications↗
Ecologic changes in the oral cavity caused by removable partial dentures.
1. The introduction of a removable partial denture into the oral cavity adversely affects the prevailing ecologic situation in terms of plaque formation. 2. The rehabilitative effect of a removable partial denture may be safeguarded by controlling plaque formation by strict personal hygienic measures on the part of the patient. In particular, proximal surfaces adjacent to denture bases should be pointed out to patients as surfaces to which they must give special attention. 3. Simplification of the design of removable partial dentures can reduce their damaging potentialities. 4. Further prophylactic measures, such as topical application of fluorides and perhaps other chemicals, should also be taken.
Adult↗
[Impressions in removable partial dentures].
The success of a removable partial denture, the comfort for the patient, stability and especially the psychological acceptance depend on a series of essential technicals factors. Probably the more delicate stage of the prosthetic technology is the transfer of informations from the mouth of the patient to the prothesist through the impression. In removable partial denture, impression have to take account into the balance between uncompressible hard tissue and soft structures with variable compressibilities. The diversity of clinical cases is responsible for a large diversity of techniques. The aim of this article is to describe the more common technics used in every day practice.
Dental Impression Materials↗
Distal extension removable partial dentures supported by implants and residual teeth: considerations and case reports.
The traditional treatment for an edentulous maxilla opposed by a partially edentulous mandible with a complete denture and a distal extension removable partial denture is fundamentally inadequate. Continuing resorption of alveolar bone under the denture base of the removable partial denture causes changes in the occlusal plane. Consequently, overloading of the anterior maxillary region occurs, usually leading to increased bone resorption in the anterior maxillary ridge. Placement of implants beneath the distal extension denture base of the removable partial denture can result in a stable and durable occlusion. Two patients in whom the use of implants combined with a cast metal removable partial denture provided occlusal stability and improved functional comfort are presented.
Adult↗
[Prosthetic rehabilitation with the removable partial dentures using telescopic crowns after removal of unsuccessful dental implants].
It is well-known that unsuccessful dental implants sometimes give rise to pronounced inflammatory bone resorption of the upper and lower jaw, and that in such cases it is practically much difficult to attain adequate prosthodontic rehabilitation after removal of the implants. On this study it is completely reported that two patients suffering from implant-induced osteomyelitis could be finely compensated for with the removable partial dentures using telescopic crowns after removal of the implants, and then the results are shortly discussed from the view of pathology, oral surgery and prosthodontics. In the first case a 52-year-old woman had been suffering from osteomyelitis of the right mandible due to the both bladevent and endodontic-endosseous implant, and in another case a 43-year-old woman had been suffering from osteomyelitis of the right maxilla due to the endosseous subperiosteal implant, and they had borne insufficient mastication on the affected side of the jaws. Several months after removal of the unsuccessful dental implants, they were rehabilitated with the removable partial dentures using telescopic crowns to recover and maintain good functions such as occlusion, mastication, cosmetics and speech, and oral and general health.
Adult↗
RESPONSIBILITY OF THE DENTIST IN REMOVABLE PARTIAL DENTURES.
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Dentists↗
Clinical evaluation of removable partial denture rest seat adaptation.
The clinical relationship between the removable partial denture cast occlusal rest and the corresponding rest seat was examined. Under the conditions of the study, it was found that rests of mandibular Class I and II removable partial dentures fit significantly better than those of mandibular Class III and IV prostheses. No significant difference was noted between similar types of maxillary removable partial dentures in this regard. In evaluating the fit of specific portions of the occlusal rest, it was found that the marginal ridge zone was more closely adapted to the rest seat than other zones for all types of removable partial dentures. However, contact, as defined in this analysis, was found to exist on a random basis in all four quadrants of the occlusal rests evaluated. In spite of this fact, one fifth of the occlusal rests did not contact the opposing rest seat at any point. Improved fit with length of service was not substantiated by a cross-sectional analysis. Suggestions were made to assist the clinician in achieving a better fit between the framework and dentition in removable partial dentures.
Dental Abutments↗
In vitro investigation of the wear of resin composite materials and cast direct retainers during removable partial denture placement and removal.
The purpose of this study was to determine whether wear of two resin composite materials and contacting I-bar clasp tips would occur within a simulated RPD placement and removal period of 2 years. The data were compared to enamel with contacting I-bars. Cast I-bar clasps were passed over each specimen in the resin composite and tooth experimental groups (n = 10). Computer digitized image analysis of SEM photomicrographs of the specimens provided data for analysis of wear. Results indicated a statistical difference in the amount of mean wear between the two resin composites and between the I-bar groups. The results from this study suggest that the selection of a resin composite for use as a RPD retentive undercut must be carefully undertaken to avoid excessive wear and loss of retention.
Analysis of Variance↗
The swing-lock denture: its use in conventional removable partial denture prosthodontics.
This article describes the uses of the swing-lock retained removable partial denture in partially dentate patients where the potential for achievable retention with a conventionally designed removable partial denture is less than adequate. The article presents two case reports detailing effective use of the swing-lock concept in removable partial denture design and it is hoped that this article will increase the awareness of practitioners to the use of this prosthesis type when planning removable partial dentures.
Aged↗
An atraumatic denture base design for a tooth-bound mandibular removable partial denture.
This technique applies accepted fixed prosthodontic pontic design to the denture base design of a tooth-bound removable partial denture. Patient feedback emphasizes the comfort and lack of bulk of the prosthesis compared with a removable partial denture of conventional design placed simultaneously.
Denture Bases↗
MOUTH PREPARATION AND MANAGEMENT OF ABUTMENT TEETH FOR THE REMOVABLE PARTIAL DENTURE.
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Dental Abutments↗