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At least 181 records · Page 10Linked to original sources
PubMed2005

The neutral zone impression revisited.

The neutral zone technique is an alternative approach for the construction of lower complete dentures. It is most effective for dentures where there is a highly atrophic ridge and a history of denture instability. The technique aims to construct a denture that is shaped by muscle function and is in harmony with the surrounding oral structures. The technique is by no means new but is a valuable one. This paper aims to provide clinicians with the knowledge to use the technique - a list of competencies is included.

Alveolar Bone Loss↗
PubMed1997

Trial of duplication procedure for complete dentures by CAD/CAM.

The purpose of this study was to duplicate the shapes of complete dentures by using a computer-aided design/manufacturing (CAD/CAM) system. The shapes of the complete dentures of an edentulous patient were measured using a non-contact type shape measurement system and morphological data at the interval of 0.25 mm were obtained in the X-axis and Y-axis directions. Measurement was performed from the occlusal surface and mucosal surface sides. Based on the three-dimensional morphological data, cutter paths for cutting were generated. For cutting, the three-step method consisting of rough cutting, finish cutting, and partial finish cutting was used and for duplicating the dentures the modelling wax was cut using a computerized numerical control (CNC) processor and ball-end mills with diameters of 6 mm and 1 mm. The method for the controlling of three axes (X, Y, and Z) of CNC machine was used, and cutting was performed only from two directions. Although further improvements are needed in the measurement and cutting in acute slope areas, the duplication of complete dentures appears to be possible using the CAD/CAM system.

Analog-Digital Conversion↗
PubMed1999

Mastication, deglutition and speech considerations in prosthodontic rehabilitation of a total glossectomy patient.

Prosthetic rehabilitation of a total glossectomized patient and specifications of the appliance, which differs from those previously reported, are presented. The functional considerations and logic used to design such a device are described. Speech performance of the patient with and without the prosthesis, is compared with a perceptibility test. Improvement of the functions of mastication, swallowing and speech were found acceptable.

Deglutition↗
PubMed2000

Changes in the edentulous maxilla in persons wearing implant-retained mandibular overdentures.

STATEMENT OF PROBLEM: It has been suggested that risk for severe resorption in the anterior maxilla is increased in persons wearing mandibular implant-retained overdentures. However, little information is available about the changes in the edentulous maxilla after mandibular implant treatment. PURPOSE: This study determined the possible changes in the width of the maxillary residual ridge 6 years after receiving mandibular implant-supported or implant-mucosa-supported overdentures and evaluated the association between the anatomic changes and subjective complaints with maxillary complete dentures. METHODS AND MATERIAL: The subjects for this study (n = 55), enrolled among the participants of a prospective clinical trial, were randomly assigned into 3 groups treated with: (a) implant-supported overdentures on a transmandibular implant system (n = 21); (b) implant-mucosa-supported overdentures on 2 IMZ implants (n = 20); or (c) conventional complete dentures (n = 14). A lingual contact occlusion concept with anterior open bite was used for tooth arrangement in all subjects. Diagnostic casts were made at baseline, and again at the 6-year follow-up. Most prominent points perpendicular to the crest of residual ridge were located in the incisor, canine, and premolar regions, after which the width of the ridge was recorded at these points with a Boley gage. Subjects' opinions on their dentures were evaluated with a questionnaire. RESULTS: Significant reduction in the width of the ridge was found in all measurement areas (mean difference = 0.4 to 0.6 mm; P <.0001). However, changes were small and not associated with the type of prosthetic restoration in the mandible. In subjects with implant-mucosa-supported overdentures, complaint of loose maxillary denture correlated with the decrement of residual ridge width. CONCLUSION: The width of residual ridge decreases with time, despite the type of mandibular prosthetic restoration.

Aged↗
PubMed2001

Masticatory muscle activity assessment and reliability of a portable electromyographic instrument.

STATEMENT OF PROBLEM: Masticatory muscle hyperactivity is thought to produce muscle pain and tension headaches and can cause excessive wear or breakage of restorative dental materials used in the treatment of prosthodontic patients. The quantification and identification of this type of activity is an important consideration in the preoperative diagnosis and treatment planning phase of prosthodontic care. PURPOSE: This study investigated the quantification process in complete denture/overdenture patients with natural mandibular tooth abutments and explored the reliability of instrumentation used to assess this parafunctional activity. MATERIAL AND METHODS: The nocturnal EMG activity in asymptomatic complete denture/overdenture subjects was assessed with and without prostheses worn during sleep. Because of the large variance within and between subjects, the investigators evaluated the reliability of the 3 instruments used to test nocturnal EMG activity in the sample. RESULTS: Electromyographic activity data of denture/overdenture subjects revealed no differences between prostheses worn versus not worn during sleep but demonstrated a very large variance factor. Further investigation of the instrumentation demonstrated a consistent in vitro as well as in vivo reliability in controlled laboratory studies. CONCLUSION: The portable EMG instrumentation used in this study revealed a large, uncontrollable variance factor within and between subjects that greatly complicated the diagnosis of parafunctional activity in prosthodontic patients.

Analysis of Variance↗
PubMed2001

Fabrication of conventional complete dentures for a left segmental mandibulectomy patient: a clinical report.

Without preprosthetic reconstructive surgery, denture fabrication for mandibulectomy patients becomes extremely difficult. Implant-assisted overdentures may improve denture retention and stability, but some patients cannot afford this treatment. For the segmental mandibulectomy patient described in this report, properly fabricated conventional complete dentures provided comfort and sufficient function.

Aged↗
PubMed2001

Conventional prosthetic rehabilitation after free flap reconstruction of a maxillectomy defect: a clinical report.

Microvascular free flap reconstruction of maxillectomy defects has been advocated as a more desirable treatment option than conventional prosthetic rehabilitation. Free flap reconstruction can successfully separate the oral and sinonasal cavities, but the reconstructed defect may not improve the treatment outcome when compared with conventional prosthetic rehabilitation of a nonsurgically reconstructed defect. In this report, the prosthetic management of a patient who underwent immediate microvascular free flap reconstruction of a unilateral maxillectomy defect is described, and the issue of surgical versus nonsurgical reconstruction is discussed.

Aged↗
PubMed2002

Will there be a need for complete dentures in the United States in 2020?

Currently, there is much speculation among dental educators that the need for complete dentures will decline markedly in the future and that complete denture training should be removed from the dental curriculum. Estimates based on national epidemiologic survey data indicate that edentulism has declined by 10% every decade and that only 90% of edentulous adults obtain and wear complete dentures. However, when the number of adults in each specific age group is multiplied by the percentage who need a complete maxillary or mandibular denture, the results suggest that the adult population in need of 1 or 2 complete dentures will increase from 33.6 million adults in 1991 to 37.9 million adults in 2020. The 10% decline in edentulism experienced each decade for the past 30 years will be more than offset by the 79% increase in the adult population older than 55 years. The clinical implications of these findings are twofold: First, practicing dentists will find that a sizable minority of the patient population will continue to need complete denture services; and second, if training in complete denture prostheses is eliminated from the dental education curriculum, millions of patients will be forced to seek denture services from alternative providers.

Adult↗
PubMed2002

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↗
PubMed2002

Prosthodontic management of a patient with neurological disorders after resection of an acoustic neurinoma: a clinical report.

This clinical report describes the treatment of an edentulous patient who had undergone resection of an acoustic neurinoma and subsequently developed neurological problems. A replacement maxillary denture combined with a mandibular denture placed in the neutral zone was selected as the treatment of choice. A simple procedure for recording the neutral zone is presented.

Aged↗
PubMed2002

Application of cast magnetic attachments to sectional complete dentures for a patient with microstomia: a clinical report.

Patients with microstomia who must wear removable dental prostheses often state that they are unable to insert or remove the prosthesis because of the constricted opening of the oral cavity. This article presents a cast iron-platinum magnetic attachment system applied to sectional collapsed complete dentures for an edentulous patient with microstomia. With the use of lingual and palatal midline hinges and a cast iron-platinum magnetic attachment, the sectional prosthesis was successfully and easily inserted and provided adequate function in the patient's mouth.

Aged↗
PubMed1979

Distribution and evaluation of complete dentures in a population in northern Norway.

The frequency and distribution of complete dentures were studied in a population of 358 persons aged 20--69 living in a community in Northern Norway. Among the 83% who attended the investigation, 49% had a maxillary and 26% a mandibular denture. The occurrence of dentures increased with increasing age and with decreasing income and/or social class, while dentures were almost equally common in both sexes, when differences of age and income were taken into account. Of the participants between 50--69 years 39% had received their first maxillary denture at the age 17--24 years. In the age group 30--49 years the corresponding percentage was 20. Forty-four percent of the participants had maxillary dentures and 33% mandibular dentures which were older than 10 years. According to an index on the clinical evaluation of complete dentures as well as to the denture wearers' own opinion, the insufficiency of the dentures tended to increase with increasing age of the dentures. Sex, age, income and social class, however, were found to have only a minor effect on the age and the condition of the dentures as well as on the denture wearers' degree of satisfaction with their dentures. Persons who had natural mandibular teeth, tended to be less satisfied with their maxillary dentures than persons with complete dentures in both jaws.

Adult↗
PubMed2005

Subjective assessment by patients of the efficiency of two denture adhesive pastes.

PURPOSE: This study evaluated the subjective responses of 30 denture wearers with regard to the effectiveness of two denture adhesive pastes. MATERIALS AND METHODS: Thirty patients responded to questions related to retention, chewing ability, taste, duration of adhesives in the mouth, and removal; comparing the use of two denture adhesives based on polymethylvinylether-maleic anhydride compounds or carboxymethyl cellulose. RESULTS: The denture adhesive paste based on polymethylvinylether-maleic anhydride (PVM-MA) compound was rated higher (73% and 87%) than carboxymethyl cellulose (CC) adhesive paste (60% and 37%) on chewing ability and duration in the mouth (p= 0.0001 and p= 0.0001, respectively) by experienced denture wearers in both maxilla and mandible. There were no statistically significant differences between the two denture adhesive pastes on the retention of maxillary dentures, taste, and removal of the adhesive (p= 0.08, p= 0.67, and p= 0.41, respectively). CONCLUSIONS: All subjects responded that the retention of their dentures was either a little better or much better when using either of the adhesive pastes.

Adhesives↗
PubMed1988

Assessment of denture satisfaction.

The aim of this investigation was to evaluate the reliability and validity of a complaints questionnaire, designed to measure different aspects of denture satisfaction. Two groups of patients with full maxillary and mandibular dentures participated in the study. The patients in Group 1 (n = 113) were on a waiting list for new dentures, patients in Group 2 (n = 102) had recently had new dentures fitted. Five denture complaint scales were constructed from the questionnaire. The internal consistency (coefficient alpha) of the scales varied from 0.65 to 0.92. Furthermore, the scales showed a discriminatory ability between the patient groups (P less than or equal to 0.001) and significant Pearson correlation coefficients with satisfaction-related questions (r = 0.25-0.79). The scores on the scales can be considered a quantitative measure of denture satisfaction.

Consumer Behavior↗
PubMed1989

Assessment of dental anxiety in edentulous subjects.

In this investigation an anxiety scale was constructed to measure dental anxiety in full denture patients. Furthermore, the relationship of this anxiety scale with denture history, denture satisfaction, and personality traits was investigated. A group of 125 patients who were on a waiting list to have new dentures constructed participated in this study. The coefficient alpha value of the anxiety scale was 0.81. Significant correlations were found with number of years with complete dentures (r = -0.20), with denture complaints (r = 0.18-0.19) and with some personality traits (r = 0.21-0.32). Further research into the role of dental anxiety with respect to dental behaviour and dental satisfaction in edentulous populations seems useful.

Anxiety↗