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Results for “Denture, Partial, Removable”

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PubMed1982

Influence of cigarette, pipe, and cigar smoking, removable partial dentures, and age on oral leukoplakia.

Oral leukoplakia, a potentially malignant lesion, has been associated with tobacco smoking, but few studies have investigated the influence of different products on lesion prevalence. In the current study 925 healthy male subjects from the Veterans Administration Dental Longitudinal Study were examined for lesion site and prevalence. The participants were grouped according to smoking status: nonsmokers, smokers of cigarettes, cigars, a pipe, cigars plus a pipe, or cigarettes plus another tobacco product. In addition, the amount of product smoked, presence of a removable partial denture, and age were examined to determine their relation to leukoplakia prevalence. The data indicated that cigar smokers had significantly fewer lesions than the other smoker groups and that persons smoking a pipe or a pipe plus cigars had the highest prevalence. Heavy cigarette smokers had significantly more palatal lesions than light to moderate cigarette smokers. While removable partial dentures did not appear to affect lesion prevalence significantly, older smokers, persons of 50 years and above, had a significantly higher prevalence than persons less than 50 years of age.

Adult↗

PubMed1989

[Study on the dynamic behavior of mandibular distal-extension removable partial denture utilizing finite element method. 2. Influence of the location of rest and displaceability of residual ridge mucosa].

The purpose of this study is to investigate the denture design and displaceability of residual ridge mucosa and its relation to the load distribution on the remaining oral structures. In this study, the effects of the location of rest and displaceability of the mucosa were demonstrated utilizing the two-dimensional non-linear analysis reported on Part 1. The results were as follows. 1. Mesial rest could be simulated on the finite element model using pin element. 2. Removable partial denture with mesial rest distributed more stress on the mesial abutment teeth than that with distal rest. 3. Lesser displaceability of residual ridge mucosa resulted in a decrease of stress concentration around the most distal abutment and the uniform stress distribution on residual ridge was increased. 4. In the simulated condition where an increased pressure was applied on the mucosa, the behavior of the saddle on the mucosa with large displaceability could be similar to that of the mucosa with small displaceability. The results of this study suggested that mesial rest on the most distal abutment and pressure impression was desirable in removable partial denture with distal-extension.

Alveolar Process↗

PubMed1989

Cross-sectional study of the periodontal status of removable partial denture patients.

Thirty-four patients, 18 men and 16 women with a mean age of 62 years, provided with removable partial dentures were reexamined after 3 years. Approximately 92% of the dentures were bilateral distal-extension prostheses. The periodontal parameters registered were (1) oral hygiene, (2) gingival inflammation, (3) pocket depth, and (4) tooth mobility. Fourteen of the patients had followed the recommendation to visit a dentist for regular checkups at least once a year. For all periodontal parameters, the results were somewhat better for those patients who had regular checkups than for those who had not. The results for the regularly checked patients were similar to those of the patients in an earlier longitudinal study from the same clinic after a corresponding period of time. Thus the good results obtained in the longitudinal study were duplicated 10 years later in this cross-sectional study.

Adult↗

PubMed1992

Application of the rotational path design concept to a removable partial denture with a distal-extension base.

Biomechanical considerations for use of the rotational path design concept to construct a removable partial denture for a patient with a tooth-bounded ridge on one side and a distal-extension ridge on the opposite side are presented. The various axes and arcs of rotation that occur during masticatory function are identified and their effects on the prosthesis and supporting structures are analyzed. Sequential steps in the necessary surveys of the master cast are enumerated. Critical details for the most effective and least deleterious placement of the rigid retentive element on the mesial surface of the posterior molar abutment (on the tooth-bounded ridge) are described.

Dental Abutments↗

PubMed1989

Use of an Adams clasp for a cast unilateral removable partial denture.

A unilateral complete dentition with tight intercuspal contacts complicates the design of the interocclusal retentive elements of a cast removable partial denture. Use of an Adams clasp, which is connected to a predesigned retentive mesh in the metal framework, is suggested as a conservative and economical treatment option in this situation. Guidelines for minimizing the risk of breakage of the Adams clasp are presented.

Denture Design↗

PubMed2000

Titanium for removable partial dentures (III): 2-year clinical follow-up in an undergraduate programme.

This study examined the success of titanium (Ti) removable partial dentures (RPDs) compared with that of cobalt-chromium (Co-Cr) RPDs using a randomized controlled clinical trial. Thirty-eight RPD patients were provided with either Co-Cr (20 patients) or Ti (18 patients) RPDs. The total numbers of dentures was 31 (13 maxillary, 18 mandibular) for Co-Cr and 23 (11 maxillary, 12 mandibular) for Ti. Patients were reviewed for 24 months following denture issue. After the initial 12 months, 20 clinical problems were recorded and became the criteria for subsequent assessment. Incidence of failure was analysed using both Fisher's exact test and the chi square test at a significance level of P<0.05. Fracture of retainers in both metals occurred only in the first 12 months. Some failure types presented at significantly higher levels in the first 12 months but there were no significant differences between the two in all the criteria examined between the 12- and the 24-month reviews. Although differences existed in failure types between Co-Cr and Ti RPDs during the early review stages, the overall success rate of Ti RPDs was comparable with that of Co-Cr RPDs after 24 months. The higher incidence of failures in Ti RPDs prior to the 12-month review suggests the importance of taking its lower rigidity into account when designing RPDs.

Chi-Square Distribution↗

PubMed2003

Treatment with removable partial dentures: a longitudinal study. Part I.

The aim of this study was to evaluate the effectiveness of an oral rehabilitation by removable partial denture (RPD). Between 1983 and 1994, 629 patients were provided with an RPD at the Dental School of the Université catholique de Louvain. All the RPDs were constructed with a cobalt-chromium framework. All the treatments were provided by dental students under the supervision of clinical instructors. At recall time (1998-2000), 269 patients could not be reached neither by telephone nor by mail and 27 had died. Consequently, 333 patients were called for clinical examination and 254 of these (76.3%) actually attended. For a total of 292 RPDs fitted for these 254 patients, 218 (74.7%) were still being worn at the time of the check-up. Seventy-four dentures were considered to be 'failures', either because they were replaced by another RPD or by a complete denture, or because they had actually never been worn. The statistical analysis (Mantel-Haenszel and Kaplan-Meier) shows that the number of failures is significantly higher at the lower jaw compared with the upper jaw. Most of the failures are attributable to RPDs with free-end saddles and, in particular, to class I mandibular dentures. The patients are wearing their denture(s) mostly continuously (63.6%) and award a high degree of satisfaction to their denture. In general, the results recorded may be considered as very satisfactory, all the more so as we have no regular recall procedures established at our school and as check-up asked for spontaneously by the patients in the course of the period of observation are most of the time occasional or non-existent.

Chromium Alloys↗

PubMed2002

Preparation of composite retentive areas for removable partial denture retainers.

A method is presented in which light-polymerized composite material is used to obtain retention for a removable partial denture when usable natural tooth undercuts are unavailable. The desired contour is waxed on a diagnostic cast with the use of a surveyor, captured in a light-polymerizing temporary restorative material, and reproduced in composite resin on the abutment teeth.

Composite Resins↗

PubMed2000

The satisfaction with the removable partial denture therapy in the Croatian adult population.

Little is known about the outcomes of treatment and patient's satisfaction with removable partial dentures in adult Croatian population. Therefore patient's satisfaction with their partial dentures in relation to some socio-economic variables was studied. Patient's satisfaction with denture retention, speech, aesthetics, comfort of wearing dentures, chewing ability was also studied in relation to different denture classification, construction, material, denture base shape (major connectors), denture support and the number of missing teeth. A total of 165 patients, 59 males and 105 females between 38 and 87 years took part in this study. A questionnaire, devised for a purpose of the study, was divided into three parts. In the first part, patients answered questions about age, gender, marital status, education, general health, socio-economic status, self-supporting life, period of tooth loss and number of previous denture experiences and in the second part, patients graded their partial dentures, depending on the level of satisfaction, by using a scale from 1 to 5. In the third part a dentist determined Kennedy classification and their modifications, denture material and denture support, denture base shape and the number of missing teeth and graded a denture construction. Influence of these factors on patient's satisfaction was analyzed. A majority of the examined patients were satisfied with the partial prosthesis, but a small amount of dissatisfaction existed. More then half of them scored all the examined parameters to the best score category. Considering chewing with lower partial dentures, women were more satisfied than men (p < 0.05). Patients with more missing teeth gave lower grades for the comfort of wearing dentures (p < 0.05). Patients of higher education gave lower grades (p < 0.05) for the aesthetics. Patients were not satisfied with speech if the dentist graded a construction of a lower partial denture low (p < 0.05). Dissatisfaction was related to mastication, aesthetics, number of missing teeth and ability of speech. These findings can aid a clinician in discussing a treatment plan and help a patient understand the risk of dissatisfaction in the presence of certain factors.

Adult↗

PubMedDate not supplied

Orthodontic realignment of a tipped molar abutment using a cast metal removable partial denture.

A combined orthodontic/prosthodontic technique for the treatment of tipped abutment molars is described. The technique uses a cast metal removable partial denture with an uprighting wire and coil spring engaging an orthodontic tube bonded onto the tipped abutment. When the molar has been uprighted to the desired position, a clasp assembly is added to the prosthesis.

Dental Abutments↗

PubMedDate not supplied

[Experimental study of removable partial denture retention].

This article describes a series of laboratory experiences about the retentive action of different designs of free end removable partial dentures. It reaffirm the classic concept of the better efficiency of the gingival -occlusal arm clasp than the gingival-occlusal ones, the efficiency and benefits of the rough clasp and the important retention of the posterior action clasp. We find also that the classic concepts of direct and indirect retention can be reformulated, in attention than the odem retainers, such as derived from DPI conception, develops an integral concept of retention and a rational system of fixing derived of the retainer design and the abutment preparation.

Bicuspid↗

PubMedDate not supplied

[Modifications of occlusal and axial morphology in removable partial denture].

The axial and occlusal preparation of the teeth is necessary to the sustentation, the stabilization and retention of a removable partial denture. The preparations by subtraction concern the axial and occlusal surfaces. The creation of guided surfaces within the enamel of the proximal surfaces, always start before the realisation of the occlusal boxes. The preparation by addition using composites present an esthetic and economic solution to the remodeling of the axial contour of the teeth. This promising technique has however no long term results.

Composite Resins↗

PubMed1995

Removable partial denture design habits in general dental practice in Sweden.

An investigation was made concerning Swedish general dental practitioners' habits in removable partial denture design and their opinion of the undergraduate training programme in this matter. The investigation showed that many dentists failed to provide adequate prescriptions and that they relied heavily on the dental technician for partial dental design. A clear majority of the participants, educated at Umea dental school, considered the undergraduate training programme to be adequate, whilst a similar percentage educated at Gothenburg dental school was dissatisfied. The faculties in Stockholm and Malmo were placed between Umea and Gothenburg in this respect. The majority of the participants in this survey declared that the opportunity to attend small group postgraduate courses in the subject was desirable. A prerequisite for dentists to have control of the treatment they are responsible for, is that they at least have the necessary knowledge. This knowledge may have to be achieved after qualification instead of during their undergraduate training.

Attitude of Health Personnel↗

PubMed1999

[Functional mobility measurement of removable partial dentures using newly-developed analyzing system in six degrees of freedom--effect of cusp inclination of molar artificial teeth on denture displacement in function].

A measuring system to record three-dimensional displacement of removable partial dentures (RPDs) in six degrees of freedom has been developed. The system employed three pairs of photodiode and LED that were set up in a triangle. This system was capable of recording the in vivo RPD displacement with a recording sensitivity of 0.1 mm. In vivo displacement of upper RPDs with unilateral distal extension saddle was investigated using this measuring system to determine the effect of artificial cusp inclination of molar teeth on denture mobility. Two groups of different artificial dentition were switched to be attached to each of three experimental RPDs. The artificial teeth with cusp inclinations were calibrated to contact with opposing natural dentition during lateral grinding of the mandible, while the other artificial teeth were prepared to disclude with the mandibular teeth (flat-cusp group). Displacement range and average position of a reference point at the first molar of the RPDs during mastication were measured and analyzed as a function of the cusp inclination and the test food. As a result, the average displacement of the RPDs toward the edentulous ridge was smaller in the cusp group than that in the flat-cusp group, while the range of horizontal displacement in the buccal-palatal direction was greater in the former group than the latter. The denture wearers demonstrated typical grinding strokes at the end of the closing phase of the mandiblar movements when they chewed a peanut, which was attributed to a wide range of horizontal displacement of the dentures.

Denture, Partial, Removable↗

PubMed1989

Runner bar modification for mandibular removable partial dentures.

Breakage of a segment of an acrylic resin denture base of a mandibular removable prosthesis may result from inadequate retention and support. The runner bar modification can be a solution for this problem, especially where excessive crown length is to be restored in the mandibular anterior region. A technique is described for placement of a 14-gauge (1.7 mm) round wax runner bar that conforms to the anterior arch form on the removable partial denture wax-up. Wax vertical struts are added between the denture base retention and the runner bar. Improved retention and rigidity, without compromising esthetics and function, can be obtained through use of this procedure.

Denture Bases↗

PubMedDate not supplied

Factors associated with masticatory performance in unilateral distal extension removable partial denture patients.

PURPOSE: Masticatory performance of denture patients is an outcome of the intricate inter-relationship between patient characteristics and denture construction. This study aimed to identify both patient- and denture-related factors associated with masticatory performance in unilateral distal extension removable partial denture patients (RPDs). MATERIALS AND METHODS: Seventy-two patients (25 male and 47 female, mean age 63.4 +/- 6.7 years) with unilateral distal extension RPDs were included in the study. The Mixing Ability Index (MAI) obtained from a chewing test using standard two-colored wax cubes, determined masticatory performance. The effect of each evaluated factor on masticatory performance was first determined by an independent t-test or one-way analysis of variance. The statistically significant factors were entered in a model of multivariate linear regression analysis to estimate the independent effect on MAI. RESULTS: The MAI ranged from -3.06 to 0.80 (Mean -0.71 +/- 0.86). Univariate analyses identified male gender, high maximum bite force, more functional tooth units, and natural dentition opposing RPDs as patient factors increasing the MAI. Multivariate analysis (adjusted R(2)= 0.346) revealed that gender (p < 0.001), maximum bite force (p= 0.02), and number of functional tooth units (p= 0.03) were independent predictors for masticatory performance. None of the denture-related factors had a significant influence on MAI. CONCLUSION: Gender, maximum bite force, and number of functional tooth units were the main factors influencing masticatory performance of unilateral distal extension RPD patients.

Aged↗

PubMed1979

Qualitative changes in dental plaque formation related to removable partial dentures.

A study was performed on the microbial composition of dental plaque developing on fifteen abutment teeth in nine partially edentulous subjects. Bacteria were counted in samples of plaque which had formed on vestibular surfaces, and on proximal surfaces facing edentulous spaces, during a period when dentures were not worn, and then for a period when dentures were being worn. It was found that the presence of removable partial dentures favoured a proliferation of spiral organisms.

Adult↗

PubMed1997

Patient swallows removable partial denture: a clinical report.

The indications for a unilateral partial denture would appear to be when there is a single posterior tooth missing, bound on both sides by usable abutments. Another consideration for a unilateral partial denture is that the patient does not want to restore the space with a fixed partial denture. One drawback to this treatment modality is that the prosthesis needs to be removed after each meal and cleaned. Other more important reasons for not making a 1-tooth removable partial denture is that it provides no cross-arch stabilization and there is the chance that it may be swallowed if it becomes dislodged. This clinical and laboratory report describes how this patient was treated.

Deglutition↗