Single Denture Research Articles

Accuracy And Oral Health-Related Quality of Life in Patients with Selective Laser Melted Versus Conventional Metallic Maxillary Single Denture Base: A Randomized Controlled Crossover Trial

Accuracy And Oral Health-Related Quality of Life in Patients with Selective Laser Melted Versus Conventional Metallic Maxillary Single Denture Base: A Randomized Controlled Crossover Trial

Patient Satisfaction and Oral Health-Related Quality of Life for Four Implant-Assisted Mandibular Overdentures Fabricated with CAD/CAM Milled Poly Methyl Methacrylate, CAD/CAM Milled Poly Ether Ether Keton, or Conventional Poly Methyl Methacrylate. A Cross-Over Clinical Trial.

New materials for overdenture base construction were evolved. Thus, more clinical trials are needed to validate these materials. This study was aimed to compare the difference between CAD/CAM milled Poly methyl methacrylate (PMMA), Poly Ether Ether Keton (PEEK), and conventional mandibular implant assisted overdentures regarding patient satisfaction and oral health-related quality of life (OHRQL). This randomized, crossover, clinical study included 18 completely edentulous subjects rehabilitated with three mandibular implant-assisted overdentures with three different denture base materials opposing a maxillary single denture. These materials were: CAD/CAM milled PMMA, CAD/CAM milled PEEK, and conventional PMMA. Every participant first received each mandibular overdenture in a random manner. After six months of each overdenture use, patient satisfaction and oral health-related quality of life were assessed using Visual Analog Scale (VAS) and Oral Health Impact Profile (OHIP-EDENT-19) respectively, then cross-over to other groups was done. The same was repeated to the last group. Comparison of VAS and OHIP-EDENT-19 between groups were done using Kruskal Wallis test followed by Bonferroni test. Regarding all the VAS items, there were statistically significant higher scores for CAD/CAM Milled PMMA, and PEEK than conventional PMMA base except for speech, esthetic, smell. Regarding OHIP-EDENT-19, many items revealed statistically lower problems scores for CAD/CAM milled PMMA, and CAD/CAM milled PEEK than conventional PMMA base except psychological discomfort, psychological disability and social disability. Within the limit of this study, CAD/CAM milled PMMA, and CAD/CAM milled PEEK were recommended as implant-assisted overdenture bases as it revealed higher patient satisfaction and better oral health-related quality of life in comparison to conventional PMMA implant- assisted overdenture.

Clinical Evaluation of Conventional Maxillary Heat-Cured Acrylic Single Denture Versus PEEK: A Crossover Study of Retention

Purpose: This clinical study aimed to evaluate the retention quality of conventional heat-cured poly methyl methacrylate (PMMA) compared to Poly Ether-Ether Ketone (PEEK) maxillary single dentures. Materials and Methods: Ten participants were eligible having completely edentulous maxillary arches opposed by class I Kennedy mandibular arches. Every patient received two maxillary single dentures fabricated by two different materials and techniques utilizing a crossover design. Each patient was provided with a single maxillary conventional PMMA denture fabricated by the conventional technique (group I) and a PEEK single maxillary denture fabricated by CAD /CAM technique (group II). The force-meter was implemented to measure the retention of the maxillary single dentures at time of denture delivery (T0) and then after 3 months of insertion (T3). Every denture was subjected to a slowly increasing vertical load until it was totally out of place (that was for 5 times at 10-minute intervals). The average retention of maxillary single dentures of both groups was analyzed using Paired t-test. Results: CAD/CAM PEEK maxillary single dentures showed statistically significant higher mean retention values than conventional heat-cured maxillary single dentures at time of insertion (P = 0.031),also, after three months post insertion (P = 0.04). Conclusions: CAD/CAM (PEEK) maxillary single dentures offered significantly higher retention than that of conventional heat polymerized single dentures. CAD/CAM (PEEK) maxillary single dentures could be a suitable choice when retention improvement is required. Recommendation: More long-term studies of variant evaluation methods are thus required to validate the results of this study.

Study on Overdenture of Immediate Implant Placement and Function.

This study aims to investigate the bone remodelling and resorption in immediate implantation and restoration of clinical implant-supported overdentures. Six adult domestic dogs were divided into 2 groups: In the experimental group, 6 implants were immediately placed in each mandible, the distal end implants were inclined distal to the long axis of the tooth at an angle of 30 degrees, and restored immediately. As the control group, the animals underwent immediate implant placement with single denture restoration, respectively, nontilting and tilting at 30 degrees in the long axis of the tooth. The osseointegration index (OI) and rate of bone ingrowth fraction were measured, and the peri-implant bone remodelling was observed. The marginal bone loss was measured in the slices of bone-implant and analyzed. New bone regenerated and had remodelled in each group. The experimental group had no statistically significant differences, when compared with other groups, except the tilted implant control group, in terms of the OI and bone ingrowth fraction. Obvious bone absorption did not statistically significantly occur in implant-supported overdenture of immediate implant placement and function with satisfactory new bone and OI.

Complete denture replacement: a 20-year retrospective study of adults receiving publicly funded dental care.

There is little evidence as to what is the appropriate replacement interval for complete dentures. The aim of this study was to determine the longevity of complete dentures in a population of publicly insured adults across a 20 year observation period. The records of 187,227 Australian adults who accessed complete denture treatment through public clinics between 2000-2019 were assessed. Time to denture replacement was modelled using a Weibull regression and a competing risk regression to adjust for the competing risk of mortality. Over a 20-year period, 27.7% of dentures were replaced, with a mean longevity of 6.06 (SD: 3.93) years. Pairs of complete dentures had greater mean longevity than single dentures (p<0.001). Approximately 4.6% of dentures provided were replaced within 2 years; 18.4% were replaced between 2 and 10 years and 4.6% of replacements occurred after 10 years.Over 70% of adults who received a complete denture did not replace it during the observation period. Dentures provided by denturists had higher levels of replacement than those made by dentists. Participants over 80 years of age had lower rates of denture replacement. Low socio-economic status and living outside a major city were associated with reduced rates of replacement for dentures under 10 years of age. Complete dentures were commonly replaced after 6 years of service. Pairs of dentures lasted longer than single dentures.

Comparing the effect of occlusal adjustment using T scan and articulating paper on the vertical bone height changes around dental implants supporting lower single fixed detachable hybrid prosthesis

The Purpose of this study is to is to compare the effect of occlusal adjustment using T scan III and articulating paper on the vertical bone height changes around dental implants supporting lower single fixed detachable hybrid prosthesis Material and method: Fourteen male patients having completely edentulous mandibular arch and full dentate in the maxillary arch were selected from the outpatient clinic prosthodontics department faculty of dentistry Ain Shams University. All Patients were rehabilitated with six implants retaining mandibular fixed detachable prosthesis designed by CAD/CAM. According to the method of detection of occlusal errors and adjustment the patients were divided into two groups , Group I where T scan III device was used to detect occlusal errors and group II where articulating paper was used and occlusal adjustment were made according to the tool used. Radiographic evaluation using CBCT was done to evaluate the vertical bone loss around the supporting implant throughout the follow –up period. Results : There was increase in vertical bone loss in group I and II through-out the follow up period and on comparing the two groups there was a significant increase in the vertical bone height changes around the supporting implants in group I after one year from the follow up period Conclusion : Within the limitation of this study, it could be concluded that the use of t scan III device allow for better occlusal adjustment in case of implant supported lower single denture than articulating paper and resulting in less vertical bone loss

Patient Satisfaction, Retentive Characteristics and Masticatory Efficiency in Maxillary Single Denture Wearers with Different Denture Bases: A Randomized Crossover Clinical Trial

Purpose: To evaluate patient satisfaction, the retentive characteristics, and the masticatory efficiency in maxillary single denture wearers with 3 different denture bases. Material and Methods: 40 patients; 10 dentate (control group (GC)) and 30 completely edentulous maxillary ridges patients (43-56 years) were selected for this study. The maxillary completely edentulous patients were divided into 3 groups randomly; 10 patients each and received single dentures; Group I (GI) received conventional heat cured acrylic resin (AR) followed by thermoplastic acrylic resin (TAR) then thermoplastic nylon (TN) denture base (GI:AR/TAR/TN), (GII:TAR/TN/AR) and (GIII:TN/AR/TAR). Patient satisfaction, the retentive characteristics and the masticatory efficiency were evaluated 3 months after delivery of each single denture. Results: 27 out of 30 patients had age of (mean 50 ± 3.7 years) accomplished the study. Statistically significant differences were observed in comfort and appearance, p≤ 0.05. No statistically significant differences were observed in phonetics, pain, or ease of cleaning of maxillary single denture, p>0.05. Statistically significant differences were observed in the retentive forces between (AR, TAR and TN), p≤ 0.05 except between (TN and TAR), p>0.05. Statistically significant differences were observed in the masticatory efficiency between (GC, AR, TAR and TN), p≤ 0.05 except between (TAR and TN), p>0.05. Conclusions: Maxillary single dentures with TN denture bases showed the advantage over TAR and AR denture bases in terms of comfort and appearance. Retention forces of TN and TAR were comparable and higher than that of AR denture bases. Type of denture base does not influence the masticatory efficiency of maxillary single denture wearers.

An Overview On Dental Prosthesis Complications And Challenges

Teeth loss and replacement problems have been a bother for centuries. However, back in the 19th century, the science of dental implantology reached its golden era. The restoration procedure employed several materials that were prepared to mimic a natural tooth shaping and function. Nowadays, both fixed supported partial dentures and single dentures are an option of choice. Many studies were conducted to evaluate the survival rates. Good survival rates were reported in both single and multiple im

Effect of Different Denture Base Materials on the Masticatory Muscle Performance in Patients Wearing Single Maxillary Complete Denture: A Cross-over Study

Purpose: The aim of the research was to evaluate the masticatory muscle performance with different resilient denture base materials in maxillary single denture. Material and methods: Six patients were included in this cross over study. In the first stage of the study, the patients were instructed to use the denture (PMMA denture base) for 1 month and the masticatory muscle activity was assessed in the second and fourth weeks after delivery. A wash out period of two weeks was applied in this study to eliminate the effect of the previous denture then the denture material was relined to soft liner, then replaced with breflex flexible material. For each type of denture base relining material, EMG was recorded after 2 weeks form day of denture insertion (adjustment phase) then EMG was recorded after 4 weeks after complete muscles adaptation (adaptation phase). Results: Comparison between three types of denture bases was performed by one way ANOVA test which revealed significant difference between them regarding duration and amplitude of both masseter and temporalis after 2 weeks and after 4 weeks as P <0.05. Conclusion: This in-vivo study, which shows that rehabilitation of correct masticatory muscle function, improved with the proper use of denture base material and which leads to improvement in the patient’s quality of life.

A Comparative Study Between Telescopic and Ball and Socket Attachments Used for Maxillary Implant Supported Single Dentures

Purpose: This study was conducted to compare between maxillary implant-supported overdentures retained by telescopic and ball and socket regarding retention. Material and Methods: seven male patients had completely edentulous maxilla free from any systemic disease that might affect bone metabolism was selected to participate in this study. Each patient received four dental implants in the edentulous maxilla using computer guided surgical stent. Implants had enough antero-posterior spread so that load can be distributed equally. Once the implant osseointegration appears to be satisfactory, the maxillary four implants were loaded with two different attachments as follow; Group I: All patients received maxillary single denture retained with ball and socket attachments and used it for three months. Group II: After a wash up period of two weeks, all patients received another newly constructed maxillary single denture retained with telescopic attachments and used it for another three months. Retention of both groups was measured using universal testing machine. The assessment was made at time of insertion, one month and three months follow-up period. Results: Group II showed higher retention values compared to Group I. Conclusion: ball and socket attachment as well as telescopic attachment showed decrease in retention but telescopic attachment revealed a higher score than ball attachment due to frictional retention.

Window impression technique for a single denture with maxillary anterior flabby ridge

Objective:Theaims to explain the window impression technique for a single denture with flabby tissue area in maxillary anterior ridge in the form of case report.Methods:The clinical examination showed the maxillary complete edentulousridgewithflabbyridgeareainthemaxillaryanteriorregion opposing the anterior natural teeth in the mandibular.Results: There were various impression techniques used in the management of flabby tissue in the maxillary anterior ridge for a single denture cases.Conclusion: The window impression technique is one of the proper techniques used in the management of flabby tissue for the single denture impression.Keyword: Anterior ridge, Flabby ridge, Single denture

Effect of Different Denture Base Material on Electromyographic Activity in Maxillary Single Denture Wearers

Aim of study: was to evaluate and compare the effect of three different denture base material (heat cured acrylic resin, cast metal base and thermoplastic resin) on electromyographic activity of masseter and temporalis muscles in maxillary single denture wearers. Material and methods: Ten completely maxillary edentulous patients were selected with ages ranged from 55-60 years. All patients had received heat cured acrylic resin single maxillary complete denture (Group І) then replacing the denture base through rebasing procedures by cobalt chromium (Co-Cr) (Group ІІ) then thermoplastic resin material (Group ІІІ). All patients were instructed to use their resin dentures for equal periods of three months when EMG records of muscles of mastication (masseter and temporalis) were obtained at insertion then patient recalled after one month and at the end of three months , period of two week interval was left between each group as a washing period. Results: The results of this study showed that there were a significant differences between them, as the thermoplastic resin (group ІІІ) was the best followed by cobalt chromium denture (group ІІ) then heat cured acrylic resin denture base (group І) .Conclusion: EMG activity affected by maxillary denture base material as the lesser effort of masticatory muscles was done by using thermoplastic resin denture base rather than Co-Cr or acrylic resin denture base.

An investigation into denture loss in hospitals in Kent, Surrey and Sussex.

Background The loss of dentures for inpatients can have a detrimental effect on their well-being. Self-respect and dignity become compromised along with their ability to eat meals and communicate clearly, and long-term recovery.Aim This investigation aimed to identify the reported number of dentures lost in hospitals and the financial reimbursements given by trusts to replace them.Method Information on reported denture loss and reimbursement was collected in 12 trusts throughout Kent, Surrey and Sussex.Results Eleven out of 12 trusts returned data about how many dentures were lost in their hospitals, between them 695 dentures were reported lost over five years (2011-16). Seven trusts reported financial reimbursements for dentures losses; results showed £357,672 was reimbursed over six years (2010-16), the highest amount reimbursed for a single denture was £2,200.Conclusion The results indicate that denture loss is a problem in hospitals that contributes to the financial burden for the NHS. Consideration needs to be given by hospitals to find ways to reduce the number of dentures lost every year.

COMPARATIVE STUDY OF RETENTION AND PERI-IMPLANT OUTCOME OF FOUR IMPLANTS USED TO RETAIN MANDIBULAR SINGLE OVERDENTURE PLACED IN LINEAR VERSUS QUADRILATERAL DISTRIBUTION

Purpose: To compare the effect of linear versus quadrilateral distribution of four implants retained mandibular single overdenture using ball attachments on the retention of mandibular overdenture and on peri-implant outcome. Materials and Methods: Twelve patients were selected for this study with average age from 40-60 .They had maxillary dentulous arches opposing mandibular edentulous arches. Maxillary occlusal plane rehabilitation was made .Mandibular single denture was constructed and duplicated in clear acrylic resin to be used as surgical stent. According to the distribution of implants, the patients were randomly divided into two groups; Group I where the four implants were distributed in a linear form in the interforaminal distance, two in the site of mandibular lateral incisor, and two in the mandibular canine site, group II where the implants were distributed in quadrilateral distribution in the canine, second premolar region. After osseointegration period, ball attachments were used to retain the mandibular single overdenture. The retention of the mandibular overdenture and the peri-implant outcome were evaluated using the following variables: (1) modified plaque index; (2) modified bleeding index; (3) probing depth; (4) implant mobility using the Periotest instrument. The measurements were evaluated at time of mandibular single overdenture insertion (T0), six month (T1), and twelve month (T2) after mandibular overdenture insertion. Results: The descriptive statistics of retention showed statistically insignificant difference in the retention measurements at the three periods of time within the same group (p= 0.493 in group I and p= 0.255 in group II). However, there was statistically significant difference between the two studied groups at each observation time (p < 0.001at the three observation times). The comparison of periimplant outcome showed statistically insignificant difference between two groups and statistically significant difference within each group, except implant mobility as it was zero mobility in both groups and along all the period of the study. Conclusion: Quadrilateral distribution of four implants used to retain mandibular single denture is more advantageous than linear distribution, however further radiographic evaluation, and study the effect of using different attachments are recommended.

Triad treatment option to restore full mouth

The primary consideration for continued denture success with a single conventional complete denture is the preservation of that which remains in the oral cavity. The single denture is a complex prosthesis that requires a complete understanding of the basics of denture occlusion. The problems involved in providing comfort, function, proper esthetics, and retention for the maxillary complete denture patient with natural opposing dentition may be challenging. The damage to the edentulous ridge and inability to wear the denture may be avoided by good prosthetic treatment which includes adequate denture base, correct jaw relation record, and proper occlusion. In this case report, a female patient reported with generalized attrition of the remaining maxillary dentition. After clinical evaluation, taking into consideration the patient's expectations, treatment plan was decided. Using fixed, removable, and complete denture prosthesis, patients functional and esthetic requirements were fulfilled, which gave her comfort and satisfaction.

A single complete denture with cheek plumpers to improve facial aesthetics

Presence of teeth in one arch makes it difficult for the operator to fabricate a single denture on the edentulous arch due to altered occlusal schemes, supraerupted teeth and resorbed edentulous ridges. Natural teeth should be preserved but at the same time one should be aware that the edentulous ridge may be destroyed by forces exerted against the denture support. In this case the occlusal correction of the mandibular teeth is done using an acrylic template. Along with replacement of missing teeth emphasis, should be on improvement of facial esthetics. Slumped cheeks are unaesthetic and add to the person’s age. This case shows a way to improve facial aesthetics and function in a maxillary single arch edentulous patient. The missing teeth in the lower arch were rehabilitated with fixed partial denture.

下顎シングルデンチャーにインプラント補綴治療を行なった一症例

下顎シングルデンチャーにインプラント補綴治療を行なった一症例

Clinical evaluations for the masticatory efficiency of heat cure resin and flexible types of denture base materials

The aim of this study was for estimation and comparism of masticatory efficiency in patient wearing heat cured acrylic and flexible base partial denture, finding out the role of peanuts and carrots on the measurement of chewing efficiency, and to find out whether the types of P.D. (being single or two opposing each other) has any effect on the masticatory performance. Materials and methods: Twenty partially edentulous patients were selected. Five of these patients were selected having Kennedy class I with no modification against natural dentition, other 5patients having Cl.I against Cl.I. The other 5 patients having Cl.III against natural dentition and the last 5 patients were with Cl.III against Cl.III. several ways were used for measuring masticatory efficiency including: number of chewing strokes, number of swallows, the mastication time, and measure the masticatory performance by sieving method. Differences between the means of the four groups were analyzed with t-test. Results: The differences between the two denture base types in total number of strokes was significant at (p<0.001) in study group (2,3,4), the study group (4)have the highest mean value of the total number of strokes for acrylic denture during chewing carrots food types(47.6)strokes. The highest mean value of the total chewing time is for the fourth group with the acrylic denture during chewing carrots (35.2 sec.), and the highest masticatory performance index was for the flexible denture in all study groups during chewing the two tested food. Conclusion: The flexible partial denture provide better chewing efficiency than heat cure acrylic partial denture, the masticatory performance was higher for flexible partial denture than heat cure acrylic partial denture, there was significant differences between carrots and peanuts in both flexible and heat cure acrylic partial denture, and patient with single denture show better chewing efficiency than patient with paired denture.

One Versus Two Implant-Retained Dentures: Comparing Biomechanics Under Oblique Mastication Forces

The results from clinical tests of single implant-retained dentures (SIDs) are quite promising. However, the biomechanics of SIDs are still insufficiently determined. The aim of the study was to compare the implant loads and pressures beneath one and two implant-retained dentures (TIDs) under oblique mastication forces. The finite element method was used to conduct a model analysis in order to compare loading of the denture attachment onto the implant that accompanies oblique mastication forces in the cases of SIDs and TIDs. The possibility of a denture detaching and sliding on the mucous membrane surface was simulated. The SID solution faced a more remarkable tilt in the direction of the mastication forces, a higher pressures on the mucous membrane surface, and higher implant loadings. The hingelike restraints in the TID favored utilization of the support in the posterior area. The higher pressure values for the SID can be confusing and could lead to inaccurate conclusions about the acceptability of the SID. In the TID, the same areas of the mucous membrane were persistently loaded, independent of the occlusal force direction. In contrast, in the SID the full freedom of rotational movement enhances alternating use of the mucous membrane. This finding explains the more frequent sores in the mucous membrane beneath the TID than beneath the SID.

Changes in Vertical Dimension of Complete Dentures due to Rebasing with Different Techniques

ABSTRACT Dental literature is devoid of information in respect of altered incisal pin relation due to compression molding in a single denture. It is to be reckoned that in rebasing technique, the entire segment of teeth remain fixed through a matrix of set polymethylmethacrylate that binds all the teeth. Thus, the artificial teeth do not remain as individual but act as a single unified unit of all the teeth. In view of lack of information in change in vertical dimension due to rebasing procedures and with the aim of determining the method of rebasing that result in minimal changes in occlusal discrepancy, the study was undertaken to evaluate the changes in vertical dimension of occlusion after rebasing using two different methods. How to cite this article Mohammed S, Alla RK, Devarhubli A, Shakeel SK. Changes in Vertical Dimension of Complete Dentures due to Rebasing with Different Techniques. World J Dent 2013;4(2):96-99.