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At least 127 records · Page 7Linked to original sources
PubMed1978

[The stability of complete dentures in the construction of functional movement patterns].

In a cross-sectional study involving 185 full denture wearers, the stability of upper and lower dentures was determined by means of active test movements according to Herbst. The percentages of instable dentures and their confidence intervals were calculated. It was found that all sections of upper full dentures can be regarded as equal with regard to stability, whereas the sections of lower full dentures showed considerable differences. Finally, practice-relevant conclusions are drawn from the results of the present study.

Denture Retention↗
PubMedDate not supplied

Ten-year longitudinal study of masticatory function in edentulous patients treated with fixed complete dentures on osseointegrated implants.

Twenty-three edentulous patients who had been treated with a mandibular fixed complete denture retained by osseointegrated implants were followed over a 10-year period. Nine of these patients had received a maxillary fixed implant-supported complete denture prosthesis after the initial placement of the mandibular restoration, while the remainder still used a conventional maxillary complete denture. The maximal occlusal force or mastication efficiency index of those having fixed implant-supported prostheses in both arches did not differ markedly from those having only a mandibular restoration. However, at the 3-year examination, lower values were recorded for the self-rated masticatory ability, while higher values were given after 10 years. It was concluded that placement of a mandibular fixed implant-supported prosthesis in dissatisfied complete denture wearers led to a dramatic improvement of masticatory function that was quite acceptable for many patients. However, some patients subsequently demanded a maxillary fixed prosthesis to feel satisfactorily rehabilitated.

Bite Force↗
PubMed1994

The clinical serviceability of two permanent denture soft linings.

Forty-four patients, most of whom had previous experience of soft linings, had a total of 62 soft linings placed in their lower complete dentures:32 of the silicone-based Molloplast-band 30 of the heat-cured plasticised acrylic Palasiv 62. Linings were evaluated at insertion and then at 3-monthly intervals. Surface changes and the reasons for lining replacement were used to assess the clinical serviceability of the linings. The median survival time of Molloplast-b linings was significantly greater than that of Palasiv 62, whose performance was inadequate with frequent failure due to surface deterioration, with and without a failure of bonding. Denture fracture was the most common cause of lining failure for Molloplast-b and occurred more frequently than with Palasiv 62. Fading and lining discolouration was commonly observed for both materials.

Acrylic Resins↗
PubMed1990

[A clinical study of the extentional labiobuccal lingual flange complete denture].

In this study, 26 mandibular edentulous patients with severe atrophy alveolar ridge were treated by the extensional labiobucco-lingual flange complete denture prosthesis that were made by way of expanding the impression in which the external oblique ridge area, the genial tubercles, mental protuberance and more sublingual area are partially included. The results show that in retention, stability and support are better than the conventional lower complete denture. The masticatory efficiency, the bite force and the denture bearing area are much improved. There is no significant change in the height of the mandibular alveolar ridge between the conventional dentures and the extensional flange dentures after about one year. This method is easy to be used, no surgical operation is needed.

Aged↗
PubMed2002

Changes in the facial profile following insertion of complete dentures.

The effect of the topography of prostheses on the facial profile is poorly understood. This study was undertaken to identify changes in the facial profile, following insertion of dentures. The maxillary denture produced a more dominant effect than the mandibular, the greatest change affecting the philtrum and lips. The evidence also supports the concept that the tip of the upper incisors supports the lower lip. The actual length of facial tissues between selected landmarks in the midline did not change measurably following insertion of dentures in the rest position. A relationship between soft tissue shift and the known thickness of denture base was found for three landmarks, however, it was not possible to predict the size of these changes for other thicknesses of denture base with confidence.

Adult↗
PubMed1990

[Influence on the movement of a complete denture caused by differences in artificial tooth materials].

An experiment using modal analysis was used to ascertain the activity of complete dentures and artificial teeth. Three types of artificial teeth were used: a porcelain tooth, a resin tooth and a hard resin tooth. Animation and displacement values were used as criteria in determining the influence that differences in tooth materials had on the activity of the complete denture. The experiment was conducted to act as an aid in denture design and the following results were obtained: 1. The resonance frequency for the different test materials ranged from mode 4 to mode 7. 2. Regarding displacement value, a value of 1 micron or more was obtained in the 1 octave bandwidth for the 250 Hz band, 500 Hz band and the 1 kHz band. Among these, maximum displacement for the upper complete denture was as follows: When a porcelain tooth was used and a vibration of 1 for mode 1 (197 Hz) was applied, the value for the 3 cusp tip was 39.48 microns and that for the labial denture border side was 43.35 microns. As for the lower complete denture, when a porcelain tooth was used and 5 oscillation was applied for mode 1 (309 Hz), the value for the 3 cusp tip was 68.38 microns and that for the rear part of the denture border was 139.2 microns. 3. Regarding the activity of the complete denture in the 250 Hz and 1 kHz bands, when a porcelain tooth was used, a curve mode was observed for the upper complete denture in the labiolingual direction with the cervical line as the border. When the resin tooth and hard resin tooth were used, it was difficult to recognize any change with the cervical line as the border. It was also difficult to recognize a change at the cervical section for the lower complete denture. 4. As for the 500 Hz band, when a porcelain tooth and a resin tooth were used, there were frequencies (300 Hz-400 Hz) at which twisting in a labiolingual direction at the cervical section was recognized for the upper complete denture as well as frequencies (400 Hz-600 Hz) where this was not recognized. A rigid body mode was recognized when the hard resin tooth was used. In addition, differences in the location for applying for vibration had an influence on the activity of the lower complete denture.

Acrylic Resins↗
PubMedDate not supplied

Comparison of implant-retained mandibular overdentures and conventional complete dentures: a 10-year prospective study of clinical aspects and patient satisfaction.

PURPOSE: The aim of this prospective randomized clinical trial was to evaluate 10 years of treatment of patients receiving a mandibular implant-retained overdenture (IRO) or a conventional complete denture (CD). MATERIALS AND METHODS: One hundred twenty-one edentulous patients were treated with an IRO (2 endosseous implants, n = 61) or a conventional CD (n = 60). Clinical aspects and patient satisfaction were evaluated. One year after placement of the denture, unsatisfied patients of the CD group were given the opportunity to receive implants. RESULTS: In the IRO group, 4 implants were lost during the first year and 4 implants were lost during the next 4 years. Between 5 and 10 years, no implants were lost (survival rate: 93%). In the CD group, 24 patients (40%) chose an IRO between 1 and 10 years. DISCUSSION: Patients in the IRO group were significantly more satisfied than patients in the CD group after 1 year (satisfaction score 8.3 versus 6.6 on a scale of 1 to 10), after 5 years (7.4 versus 6.4), and after 10 years (7.7 versus 6.8). CONCLUSION: The mean satisfaction score of the CD group (including patients who later received implants) was still lower than that of the IRO group, in spite of the opportunity for retreatment with IROs. Endosseous implants had a high survival rate after 10 years of follow-up.

Dental Implants↗
PubMed1993

[Speech characteristics of persons wearing full upper and lower prostheses].

We've taken under comparative examination the phonation of people having full upper and lower dentures and the ones having normal teeth. We've tested twenty 51 to 65 years old persons having their dentures at least for a year being pleased with them (well speaking and chewing normally) and twenty persons (without distinction as to sex) having normal teeth normal occlusion. The investigation of the articulation was compiled a lingual corpus consisted of texts of different length (words, word-groups, sentences and text-pieces). This material was suitable for the examination of disorders of the articulation, the pronunciation of the sound combinations, the articulatory problems, and the suprasegmental components (e.g. melody, speech tempo, dynamics of speech). The experimental material was prepared by the following instruments: an VII (Voice Identification, Inc.) 700 series sound spectrograph, an IBM compatible computer with acoustic analytical programs suitable for the investigation of selected sound samples by an A/D (analog/digital) converter, the number of sounds in a second was measured with a 8SO-4 type oscillograph. The results can be summarized as follows: 1. various differences appear among the speech structures of persons having full upper and lower dentures: the labial [b p m], labiodental [v f ], dental, dentialveolar [d t n z s dz ts l r], alveolar [symbol: see text] and prepalatal [symbol: see text] consonants distort principally. 2. From the long consonants the voicelles stops (p: t: k:) are short-ended especially.(ABSTRACT TRUNCATED AT 250 WORDS)

Denture, Complete, Lower↗
PubMed2003

[Prosthetic evaluation of the sagittal curve of the edentulous mandibular ridge].

The literature lacks reports on measurement-based investigations of the sagittal curve of the mandibular ridge. The prosthetic significance of that curve is a debated issue even today. Our investigations have been carried out on functional samples of randomly selected edentulous patients (55 females and 17 males) treated at the Department of Prosthodontics of the Semmelweis University, Budapest. We made photographs using a Polaroid MACRO 5 SLR camera on a squared factory-made film, under standard circumstances, from both right and left directions. The photographs were then scanned with 600 dpi resolution and saved as non-compressed tif files (Tag Image File Format). The evaluation of the digitalized photographs has been carried out using a specifically developed computer program. On the four-times enlarged pictures, we made three measurements at each point; the arithmetical means of those sets of three figures served as a basis for statistical analysis. The data were analysed by gender and by side, using the SPSS program package (t-test). Our measurements showed that the sagittal curve is characteristic of the edentulous mandibular ridge as well. However, it does not exhibit significant differences by gender, individual, or side. The average value of the lowest point of the sagittal curve was 5.78 mm, s +/- 1.96 mm, minimum = 1.83 mm, maximum = 11.12 mm. It was concluded from our measurements and comparative anatomical data--clinical observations, as well as measurement-based investigations--that the Spee-curve of the healthy dentition and the sagittal curve of the edentulous mandibular ridge are formed by the same forces. If, in everyday practice, sagittal curves of the occlusion surfaces of complete lower dentures are set parallel with the mandibular edge, this is the most preferable solution with respect to both the stability of complete lower dentures and the optimal functioning of constrictor muscles.

Cephalometry↗
PubMed1975

[Studies on the functional effect of the M. mylohyoideus on the base construction of total prostheses].

By means of anatomical examinations as well as radiograms and jaw models of probands the inclination angles of the fibers of the oral diaphragm inserting in the hyoid bone are determined in order to obtain information for shaping the lingual margins of complete lower dentures. The transition from these fibers to the fibers inserting in the median raphe of the mylohyoid muscle is about 6 to 9 mm before the tip of the alveolar tubercle in edentulous mandibles, and in the area between the roots of the second molars in dentulous lower jaws with normal position of molars. In this area the muscle has, in most cases, an angle of inclination between 30 and 40 degrees to the perpendicular plane. The inclination of the posterior fibers of the mylohyoid muscle is most frequently between 10 and 25 degrees. The difference in inclination is mainly due to the varying width of the muscular insertion in the hyoid bone.

Denture Bases↗
PubMed2000

Within-subject comparison of maxillary long-bar implant-retained prostheses with and without palatal coverage: patient-based outcomes.

Although maxillary implant overdentures are used in oral rehabilitation, different designs have not been compared previously in clinical trials. This crossover trial was designed to measure differences in patient satisfaction with maxillary long-bar implant overdentures with and without palatal coverage opposed by a fixed mandibular implant-supported prosthesis. Data were also gathered on new conventional dentures and on maxillary conventional dentures opposed by mandibular fixed prostheses. Sixteen participants were selected from a population wearing conventional dentures. Fifteen received new upper and lower dentures (1 drop-out). Four implants were placed in the maxilla and mandible (2 drop-outs). A mandibular fixed prosthesis was inserted in 13 participants, who were then divided into 2 groups. One group (n = 7) received long-bar overdentures with palate, then long-bar overdentures without palate. The other group (n = 6) received the same treatments in the reverse order. Mastication tests and psychometric evaluations using Visual Analog Scales and Categorical Scales were performed throughout the study. General satisfaction was very high with both maxillary implant-supported prostheses, as were ratings of almost all psychosocial and functional variables. There were no significant differences between treatments, suggesting that patients are equally satisfied with long-bar overdentures with and without palate when these are opposed by mandibular fixed prostheses. However, the ratings given to the maxillary implant prostheses were not significantly higher than for new conventional maxillary prostheses. This suggests that maxillary implant prostheses should not be considered as a general treatment of choice in patients with good bony support for maxillary conventional prostheses.

Adult↗