Ardee liner revisited.
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Consumer Behavior↗
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Results for “Denture Rebasing”
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Effect of 4-META adhesive on the bond strength of different metal framework designs and acrylic resins.
The effect of relining the 4-META adhesive resin onto metal alloy of a partial denture framework was tested. Seventy-two metal frameworks with three different retentive patterns were designed. Half of the specimens were treated with 4-META, the other group was left untreated. Thirty-six specimens were first divided into three groups in which 12 samples had different designs of retention, i.e. mesh, ring-shaped and flat plane. Then, each different retentive design was divided into two groups and in one group Lucitone 199 and the other QC acrylic resin were processed. Finally they were subjected to shear test. While samples with adhesive exhibited greater bond strength than the others, samples without adhesive may be ranked in the order mesh, ring-shaped and flat planes with regard to shear bond strength. In samples with adhesive, the flat plane ones displayed better results. Statistically significant differences were observed in the relationships between the groups.
Acrylic Resins↗
In vivo and in vitro study of fungal presence and growth on three tissue conditioning materials on implant supported complete denture wearers.
In this study three type of tissue conditioning materials were used in vitro and in vivo to investigate the presence and growth of Candida albicans, considered to be the pathogenic member of the genus. In vitro test results of different tissue conditioners showed that they have a tendency to have an inhibiting effect on C. albicans at the third day of incubation. For the in vivo tests tissue conditioners were placed in existing maxillary prosthesis of 21 patients who had been treated with endosseous dental implants (seven in each group). The results showed that yeast forms were observed after 3 days in two patients' dentures which were relined with Fitt. Yeasts forms were also seen in three patients' dentures after 6 days, two of them relined with Fixo-gel and the other one relined with Visco-gel. The hyphal form of Candida was seen in four patients' dentures, relined with Fitt, and also in three patients' dentures, relined with Fixo-gel and Visco-gel.
Acrylic Resins↗
Comparison of four different denture cushion adhesives--a subjective study.
Four cushion adhesives (Fittydent I; Fittydent II, introduced as an advanced formula; Protefix; and Seabond) were compared clinically through patients subjective evaluations. Maxillary dentures of 32 patients were relined and the mandibular dentures were scored by Kapur index before the application of different treatments. The cushion adhesives were used only with the existing mandibular prosthesis. The four treatments were applied to the patients in groups of 8 by allocating each group randomly to one of the four sequences of treatments determined by latin square design. Each patient took each treatment only once. The adhesives were applied by the authors as recommended by the manufacturers. Patients used each material for 24 h and, through a questionnaire, they evaluated the seven following aspects of each different cushion material: retention, duration of retention, effects on ability to chew, effects on other oral functions, cleansing of dentures, cleansing of gums, and an overall evaluation of materials. Both Fittydent products significantly improved denture retention and the ability to chew. The patients who expressed 'much better' chewing with Fittydent products, had mandibular dentures rated poor or fair.
Adhesives↗
Tensile bond strengths of hard chairside reline resins as influenced by water storage.
Due to gradual resorption of the edentulous ridge bone, removable prostheses often require denture base relines to improve fit and stability. This research evaluated the bond strength between one heat-cured acrylic resin (Lucitone 550(R)) and two hard chairside reline resins, after two different periods of storage in water (50 h and 30 days). The bond strength was evaluated using a tensile test. The mode of failure, adhesive or cohesive, was also recorded. The results submitted to the Kruskal-Wallis test indicated that the highest tensile strengths were achieved with intact Lucitone 550(R) denture base resin in both periods of storage in water. After 50 h of storage in water, Duraliner II(R) reline material exhibited the highest bond strength to the denture base resin. After 30 days of storage in water, Duraliner II(R) reline resin demonstrated a significant reduction in adhesion, showing lower tensile bond strength than Kooliner(R) material. Both hard chairside reline materials failed adhesively across Lucitone 550(R) denture base resin, in both periods of time.
Acrylic Resins↗
Method to contour the intaglio surface of an immediate denture when using a chairside soft reline procedure after tooth extraction.
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Denture Rebasing↗
Teaching an abbreviated impression technique for complete dentures in an undergraduate dental curriculum.
STATEMENT OF PROBLEM: Traditional methods for teaching complete denture fabrication are time-consuming, difficult to master, and not used by many general practitioners. PURPOSE: This study compared the efficacy of traditional denture fabrication techniques with a more abbreviated method in a dental school setting. MATERIAL AND METHODS: A retrospective record review of 80 completely edentulous patients treated by predoctoral dental students was completed. Forty patients were treated with traditional denture techniques; the other 40 patients were treated with an abbreviated method. The data abstracted included the number of visits to completion and the number of postinsertion visits and relines required within the first 3 months after delivery. A Wilcoxon rank sum test was performed to determine statistical significance between the groups with regard to number of visits for fabrication and postinsertion adjustments. A test for a difference in proportions by using the normal approximation to the binomial distribution was performed for statistical analysis of the incidence of relines. RESULTS: The abbreviated denture technique resulted in a statistically significant difference in the number of visits for fabrication (P<.01) and postinsertion adjustments (P<.05.) There was no difference (P=.39) in the number of relines between the 2 groups. CONCLUSION: Teaching the abbreviated complete denture technique in an undergraduate dental clinic decreased the number of appointments necessary to complete denture therapy without increasing the number of adjustments or reline procedures.
Appointments and Schedules↗
Prosthodontics for pediatric patients with congenital/developmental orofacial anomalies: a long-term follow-up.
Patients afflicted with congenital/developmental anomalies of the oral/head and neck regions present the prosthodontist with unique esthetic and functional restorative challenges. This article reviews the various pediatric patient categories that would benefit from placement of "vital" overdentures. A long-term follow-up of patients seen over 25 years of practice is presented with a focus on complications such as temporomandibular joint stability, caries, soft tissue and bony support changes, and denture adaptation. Longitudinal follow-up of these patients indicates that, although problems occur with overdenture therapy, the benefits of this treatment far outweigh the complications.
Alveolar Process↗
Prosthetic complications in an implant-retained mandibular overdenture population: initial analysis of a prospective study.
STATEMENT OF PROBLEM: The clinical success of implant-retained, tissue-supported mandibular overdenture prostheses has been documented. However, few studies have evaluated the return visits and associated cost required to maintain these prostheses. PURPOSE: The purpose of this investigation was to evaluate the amount of maintenance required to provide acceptable and satisfactory implant-retained mandibular overdentures in a prospective clinical trial. MATERIAL AND METHODS: Fifty-eight patients received new maxillary and mandibular complete dentures followed by placement of microthreaded/TiOBlast implants in the mandibular left and right canine regions. At 3 months, ball abutments were placed, and the mandibular prostheses were relined to receive Dalla Bona-type ball housings (baseline). Prostheses were prospectively evaluated, and adjustments were made at 3-, 6-, 12-, 24-, and 36-month recall visits and at nonscheduled visits for 9 types of prosthetic complications. RESULTS: Of 58 patients, 6 required no adjustments. The remaining 52 patients made 327 return visits (including 194 nonscheduled visits) for prosthesis and/or abutment adjustments. One hundred and fifteen practitioner hours were required to provide prosthetic solutions to patient concerns at the return visits. The total estimated cost for all professional and laboratory services was $12,624.00 ($218.00 per patient). CONCLUSION: Although mandibular implant-supported overdentures with Dalla Bona-type ball attachments are an acceptable treatment option for edentulous patients, routine maintenance is required to ensure successful long-term outcomes.
Adult↗
Application of a 3-dimensional measurement system to complete denture impressions.
STATEMENT OF PROBLEM: Little is known about tissue displacement at the tissue/denture base interface during impression making. PURPOSE: This study used a new 3-dimensional measurement system to analyze and compare 2 complete denture reline impression techniques (1 occluding and 1 digital) to determine which resulted in less displacement of the tissue/denture base interface during impression making. MATERIAL AND METHODS: The experiment included 10 completely edentulous subjects. For each subject, 3 mandibular casts were obtained: (1) a reference cast of the existing denture base, (2) a cast made with an occluding reline impression technique, and (3) a cast made with a digital reline impression technique. With the use of an optical 3-dimensional measurement system, the corresponding casts in a common coordinate system were analyzed geometrically. For each cast, the coordinates of the barycentric point and the high point were determined. For the same subject, the differences between the coordinates of the barycentric points of the 3 casts were calculated 2-by-2. The same calculation was performed for the high points. To determine whether these differences, which represent the displacements of the barycentric points and the high points, were statistically significant, the Wilcoxon signed-rank test for paired group comparisons was applied (P<.05). Cartographic differences among the casts from the same subject also were compared. RESULTS: The uncertainty of measurement for the location of the barycentric and highest point was +/-57 microm. The uncertainty in the differences among the cartographic displays was +/-0.1 mm. Vertically, the mean distance that separated the barycentric points obtained with the 2 impression methods was 0.04 mm. Cartography data showed that the greatest dimensional differences between the 2 impression techniques (minimum 0.25 mm; maximum 1.5 mm) were located near the retromolar pad and along the lingual flange. CONCLUSION: Within the limitations of this 3-dimensional in vivo study, displacement of the tissue/denture base interface was essentially equivalent with the use of an occluding and a digital mandibular impression technique.
Aged↗
Assessing the space limitation inside a complete denture for implant attachments.
Accurate determination of the space defined by the physiological contouring of a complete denture (before and after implant surgery) is required during the treatment-planning phase for an implant overdenture. This determination assists in formulating the proper surgical treatment plan and in selecting the appropriate independent implant overdenture attachment. This article presents a technique that provides clear, visual space limitation analysis of the removable prosthesis. The described method allows the clinician to determine the available space before the implant or attachment is placed.
Dental Abutments↗
Repair of implant overdenture clip attachments: technical note.
A technique is described for repositioning the clip attachments of implant overdentures during repair or relining procedures using a direct method. During maintenance procedures, clip attachments must be repositioned correctly to prevent torquing of the bar and abutments and precautions taken to avoid locking the prosthesis to the undercut areas of the bar. This technique ensures proper positioning of the attachments and decreases the amount of polymerization shrinkage.
Dental Clasps↗
Fabrication of a single-appointment emergency overdenture using failed fixed prosthetics: a case report.
A single appointment fabrication of an emergency overdenture is described. The technique was used in the treatment of a failed implant-supported fixed bridge that was unable to be reinserted due to fractured components and a lack of passive fit. This technique may also be used for the treatment of a failing natural dentition as well as an implant prosthesis.
Aged↗
Continuing changes in the contour of the maxillary residual alveolar ridge.
Using a cast measuring technique, the change in contour of the residual maxillary alveolar ridge of patients who have worn dentures for a number of years and are then fitted with new dentures, has been investigated. The study confirmed that even after 30 years of denture wearing, further bone resorption may occur beneath new dentures.
Aged↗
Parotid salivary flow rates in two patients during immediate denture treatment.
Parotid salivary flow rates in response to chewing or citric acid stimulation were studied in two patients who had their last maxillary teeth extracted and immediately replaced with complete dentures. The patients were monitored 6 months from the last week before extraction. Parotid salivary flow rate in response to chewing was increased after insertion of the denture. For one of the patients a particularly high output from the parotid gland was found 2 weeks after treatment. Throughout the experiment, parotid salivary flow was higher on the chewing side than on the contralateral side. At the end of the experimental period the dentures were relined. Salivary flow measured immediately after relining was lower than prior to this procedure. An increased salivary response was also observed during citric acid stimulation after transition from the dentate to the denture wearing state. This increase was more marked if the patients had their dentures in situ when the gustatory provocations were performed. It is concluded that parotid salivation increases during masticatory and gustatory stimulation in patients subjected to total extraction and immediate complete denture treatment, and that the presence of a complete denture per se appears to act as an additional mechanical stimulus in the salivary reflexes.
Citrates↗
Age and maintenance of removable dentures in Finland.
The age and maintenance of dentures, and denture-cleaning habits, were studied by an interview survey. The material represented nation-wide the Finnish population aged greater than or equal to 15 years old, and there were 957 interviewees, of whom 328 were denture wearers. In total, 45% of the upper and 40% of the lower dentures were over 10 years old. More than one-third of the dentures more than 5 years old had never been maintained during that time. Individuals whose dentures had been made and fitted by dental technicians visited dentists less frequently than individuals whose dentures had been made by dentists. Over 80% of the denture wearers reported cleaning their dentures by brushing at least once a day, and women cleaned them more frequently than men. The present findings suggest that denture wearers should be a special target group for dental health education, for the development of the latter, and for the development of dental health care services in the future.
Adolescent↗
Studies of changes in occlusion after the insertion of complete dentures. Part I.
The present study aims to investigate changes in the occlusion of complete dentures after their insertion. A total of 85 edentulous patients were provided with new complete dentures. Their individual hinge axes were determined using mechanical axiography and the upper finished dentures were transferred by facebows to Dentatus articulators. The lower dentures were mounted according to an intraoral central bearing point (CBP) registration and equilibrated in terminal hinge position. An articulator specially modified for measurements in the condylar area was used. The differences between the positions of the condylar balls with CBP registration and those after equilibrating the occlusion were determined. On average, 19 days after insertion, 71 patients took part in a follow-up examination. As in the first session, the terminal hinge position was registered with the CBP method using the apex of the Gothic arch. Thus, the positions of the condylar balls immediately after the new registration could be compared with those in equilibrated intercuspation 3 weeks earlier. The differences were found to be 0.5 +/- 0.4 mm (0-2.9 mm) in the three axes (sagittal, coronal and horizontal). They are thought to result from settling into the denture bearing tissues and also from neuromuscular adjustment of the masticatory system. Compulsory remounting of complete dentures after insertion is therefore recommended.
Adaptation, Physiological↗