MyMedR

Mandibular free-end saddles--a simple & effective method to increase stability and retention

Lam RV

Dent J Malaysia Singapore, 1969 Oct;9(2):26-33.

PMID: 4906530

Matched MeSH terms: Denture Design

Fulltext 30-year life span of a spring cantilever bridge: case report

Lui, J.L.

Ann Dent, 2008;15(1):48-54.

MyJurnal

Besides other indications, the spring cantilever bridge can solve the difficult clinical problem of providing diastema on either side of a pontic. Unlike the conventional bridges, it has a somewhat controversial design in that the anterior pontic is connected to its retainer on a posterior abutment by a relatively long flexible palatal bar. This paper presents a case report of a spring bridge which fractured due to metal fatigue after 30 years of continued service. Other studies reported a mean life span of 8-10 years for conventional bridges. The advantages of the spring cantilever bridge are also discussed.

Matched MeSH terms: Denture Design

Draw to learn: Removable partial denture designing through team-based learning

Sivakumar I, Arunachalam S, Buzayan MM

J Dent Educ, 2023 Jun;87 Suppl 1:892-894.

PMID: 36469857 DOI: 10.1002/jdd.13153

Matched MeSH terms: Denture Design

Fulltext Shape Optimization for Additive Manufacturing of Removable Partial Dentures--A New Paradigm for Prosthetic CAD/CAM

Chen J, Ahmad R, Suenaga H, Li W, Sasaki K, Swain M, et al.

PLoS One, 2015;10(7):e0132552.

PMID: 26161878 DOI: 10.1371/journal.pone.0132552

With ever-growing aging population and demand for denture treatments, pressure-induced mucosa lesion and residual ridge resorption remain main sources of clinical complications. Conventional denture design and fabrication are challenged for its labor and experience intensity, urgently necessitating an automatic procedure. This study aims to develop a fully automatic procedure enabling shape optimization and additive manufacturing of removable partial dentures (RPD), to maximize the uniformity of contact pressure distribution on the mucosa, thereby reducing associated clinical complications. A 3D heterogeneous finite element (FE) model was constructed from CT scan, and the critical tissue of mucosa was modeled as a hyperelastic material from in vivo clinical data. A contact shape optimization algorithm was developed based on the bi-directional evolutionary structural optimization (BESO) technique. Both initial and optimized dentures were prototyped by 3D printing technology and evaluated with in vitro tests. Through the optimization, the peak contact pressure was reduced by 70%, and the uniformity was improved by 63%. In vitro tests verified the effectiveness of this procedure, and the hydrostatic pressure induced in the mucosa is well below clinical pressure-pain thresholds (PPT), potentially lessening risk of residual ridge resorption. This proposed computational optimization and additive fabrication procedure provides a novel method for fast denture design and adjustment at low cost, with quantitative guidelines and computer aided design and manufacturing (CAD/CAM) for a specific patient. The integration of digitalized modeling, computational optimization, and free-form fabrication enables more efficient clinical adaptation. The customized optimal denture design is expected to minimize pain/discomfort and potentially reduce long-term residual ridge resorption.

Matched MeSH terms: Denture Design*

Finite element analysis and clinical complications in mandibular implant-overdentures opposing maxillary dentures

Khuder T, Yunus N, Sulaiman E, Dabbagh A

J Mech Behav Biomed Mater, 2017 11;75:97-104.

PMID: 28709037 DOI: 10.1016/j.jmbbm.2017.06.039

Denture fracture is a common clinical complication caused by improper material selection, design, or fabrication technique. This study aimed to investigate the effect of two attachment systems on fracture risk of the implant-overdentures (IOD) via finite element analysis (FEA), using the force distributions obtained from patients' occlusal analyses and to compare the obtained results with the clinical complications associated with these attachments. A three-dimensional jaw model comprised of the edentulous bones was constructed. Three types of mandibular prostheses including complete denture (CD) (model LCD), IOD with Locator attachment (model LID-L), and IOD with telescopic attachment (model LID-T), as well as a maxillary CD (model UCD) were assembled. The vertical occlusal forces at anterior and posterior quadrants were obtained from the patients wearing mandibular CDs or IODs. The FEA results were further compared with the mechanical failures of different prostheses observed at patient recalls. In overall, the fracture risk of mandibular prostheses was lower than the maxillary compartments. The UCD opposing LCD underwent higher strains than that opposing LID-L and LID-T, which was mostly concentrated at the anterior mid-palatal polished surface. On the other hand, LID-L showed the lowest strain, followed by LID-T, and LCD. The obtained results were consistent with the clinical complications observed in the patient recalls.

Matched MeSH terms: Denture Design*

Prosthetic Rehabilitation of Microstomia Patients: A Systematic Review of Published Case Reports and Case Series

Patil S, Raj AT, Sarode SC, Sarode GS, Menon RK, Bhandi S, et al.

J Contemp Dent Pract, 2019 Apr 01;20(4):508-515.

PMID: 31308286

STATEMENT OF PROBLEM: Prosthetic techniques commonly employed for the rehabilitation of edentulous patients might not be adequate in the treatment of patients with microstomia.

PURPOSE: The purpose of this paper is to systematically review all the prosthetic techniques that have been used in the oral rehabilitation of patients with microstomia.

MATERIALS AND METHODS: Data sources, including PubMed, Google Scholar, SCOPUS and Web of Science, were searched for case reports and case series published through September 2017. Three investigators reviewed and verified the extracted data. Only case reports and case series on prosthetic rehabilitation in microstomia patients published in the English language were considered eligible.

RESULTS: A total of 212 records were identified from the database search. Forty duplicate records were removed. The remaining 172 articles were assessed for eligibility, and 139 articles were removed because they did not satisfy the inclusion criteria. A total of 34 cases (including 32 case reports and 1 case series) were finally included in the qualitative analysis. The review revealed the use of a modified impression technique with flexible and sectional trays to record impressions in patients with microstomia. Modified forms of oral prostheses ranging from sectional, flexible, collapsible and hinged dentures to implant-supported prosthesis were fabricated to overcome the limited mouth opening. The success of the prosthetic technique primarily depended on the extent of the microstomia and the nature of the cause of the microstomia.

CONCLUSION: Even though the patient acceptance of the prosthetic techniques summarized in the systematic review were high, long-term success rates for each option could not be assessed because of the short follow-up time in most of the included case reports and series.

Matched MeSH terms: Denture Design

Fulltext Fit Accuracy of Removable Partial Denture Frameworks Fabricated with CAD/CAM, Rapid Prototyping, and Conventional Techniques: A Systematic Review

Ahmed N, Abbasi MS, Haider S, Ahmed N, Habib SR, Altamash S, et al.

Biomed Res Int, 2021;2021:3194433.

PMID: 34532499 DOI: 10.1155/2021/3194433

Objective: Analyzing and comparing the fit and accuracy of removable partial denture (RPDs) frameworks fabricated with CAD/CAM and rapid prototyping methods with conventional techniques.

Materials and Methods: The present systematic review was carried out according to PRISMA guidelines. The search was carried out on PubMed/MEDLINE, Cochrane collaboration, Science direct, and Scopus scientific engines using selected MeSH keywords. The articles fulfilling the predefined selection criteria based on the fit and accuracy of removable partial denture (RPD) frameworks constructed from digital workflow (CAD/CAM; rapid prototyping) and conventional techniques were included.

Results: Nine full-text articles comprising 6 in vitro and 3 in vivo studies were included in this review. The digital RPDs were fabricated in all articles by CAD/CAM selective laser sintering and selective laser melting techniques. The articles that have used CAD/CAM and rapid prototyping technique demonstrated better fit and accuracy as compared to the RPDs fabricated through conventional techniques. The least gaps between the framework and cast (41.677 ± 15.546 μm) were found in RPDs constructed through digital CAD/CAM systems.

Conclusion: A better accuracy was achieved using CAD/CAM and rapid prototyping techniques. The RPD frameworks fabricated by CAD/CAM and rapid prototyping techniques had clinically acceptable fit, superior precision, and better accuracy than conventionally fabricated RPD frameworks.

Matched MeSH terms: Denture Design/methods*; Denture Design/trends*

Custom ceramometal pontics in a Kennedy Class IV maxillary removable partial denture: a clinical report

Kamsiah GH, Ramli Y, Idris AY

Quintessence Int, 1993 May;24(5):311-2.

PMID: 8362043

A technique in which the custom-made anterior ceramometal pontics are securely attached to the metal framework of a Kennedy Class IV removable partial denture is described. This technique results in a more esthetic prosthesis with less palatal coverage.

Matched MeSH terms: Denture Design

Managing Fibrous Maxillary Ridge: A Case Series of Impression Techniques

Yee A, Meei TI, Ling GC

Prim Dent J, 2023 Mar;12(1):51-56.

PMID: 36916614 DOI: 10.1177/20501684231153909

Fibrous ridges on the edentulous maxillary arch are commonly found in combination syndrome or due to ill-fitting dentures. Often, these cases are managed conservatively using modified impression techniques to achieve better support and peripheral seal without displacing the movable tissue. Many impression techniques were proposed and justified with their respective ideologies, but some may complicate both the clinical and laboratory procedures. In this report, two simplified techniques are demonstrated to make an impression of the maxillary arch with fibrous ridges. Laboratory steps in custom tray fabrication are also emphasised for a successful and predictable impression.

Matched MeSH terms: Denture Design

Managing complications of radiation therapy in head and neck cancer patients: Part III. Provision of dentures

Rahman RA, Ngeow WC, Chai WL, Ramli R

Singapore Dent J, 2006 Dec;28(1):7-10.

PMID: 17378335

Head and neck cancer is becoming a more recognizable pathology to the general population and dentists. The modes of treatment include surgery and/or radiation therapy. Pretreatment dental assessment should be provided for these patients before they undergo radiation therapy. There are occasions, however, whereby head and neck cancer patients are not prepared optimally and, as a result, they succumb to complicated oral adverse effects after radiation therapy. The management of radiation-induced caries, a sequelae of xerostomia has been reviewed in Part II of this series. In this article, the management of difficulty with dentures, another sequelae of xerostomia following radiation therapy is reviewed.

Matched MeSH terms: Denture Design/methods

Fulltext Cobalt chromium denture designs in general practice

Mahmood, W.A., Mohd. Sidek, M.F.

Ann Dent, 2001;8(1):-.

MyJurnal

This is a preliminary survey on cast partial denture designs in the commercial dental laboratories. This survey was carried out for a month in three commercial dental laboratories in Klang Valley and Shah Alam which produce metal dentures in cobalt-chromium. One hundred and ten questionnaires with the designs were collected and analysed. The framework design on the cast was transferred into the design sheet section of the questionnaire. The aim was to investigate communication regarding denture design between clinicians and dental technician and the dentists' dependency on the technician. The design of cobalt-chromium partial dentures in relation to oral health was also assessed. The results indicated that 43.6% of the dentist who used the three laboratories delegated their removable partial design work to the dental technician. More than half of the dentists had some communication with the technicians, and only 18.2 % of the dentists prescribed clear instructions with details of components regarding denture design. Continuing dental education on partial denture design for both clinicians and dental technicians would be of value to provide reinforcement in the knowledge of the basic concept on denture designing. Communication and understanding between both parties would probably improve the quality of cobalt-chromium dentures constructed.

Matched MeSH terms: Denture Design

Fulltext Prevalence of oral tori and exostosis in Malaysian population - A cross-sectional study

Kumar Singh A, Sulugodu Ramachandra S, Arora S, Dicksit DD, Kalyan CG, Singh P

J Oral Biol Craniofac Res, 2017 Sep-Dec;7(3):158-160.

PMID: 29123992 DOI: 10.1016/j.jobcr.2017.08.008

Introduction: Oral tori and exostosis are non-pathological bony protuberances seen on the alveolar surfaces of the jaw bones. These are commonly seen on the palatal surfaces of the maxilla [torus palatinus (TP)] and around the premolars in the lingual surface of the mandible [torus mandibularis (TM)]. The aim of this cross-sectional study was to determine the prevalence of tori/exostosis in the Malaysian population.

Methodology: A total of 2666 patients were examined for the presence of tori and exostosis in the maxilla and mandible and were categorized into TP, TM, and exostosis (facial/labial). Collected data was analysed for obtaining descriptive statistics.

Results: 882 subjects were noticed with oral tori/exostosis among the population studied with a prevalence rate of 33%. TP was seen more in females (35%), compared to males (20%), and this difference was statistically significant (p value design during fabrication of prosthesis, which the dentist should be mindful.

Matched MeSH terms: Denture Design

A practical three visit complete denture system

Ling BC

Ann R Australas Coll Dent Surg, 2000 Oct;15:66-8.

PMID: 11709981

Standard prosthodontic procedures require five visits to construct a set of complete maxillary and mandibular dentures. Various attempts have been made to reduce these procedures to four or three appointments. However, most of these techniques require the use of visible light polymerized resin as the final denture base materials. Visible light-cured resin materials have inferior physical properties and biocompatibility problems as compared with heat cured polymethylmethacrylate. This paper describes a system of complete denture construction which requires three clinical appointments instead of the usual five visits. This system is made possible by using the VLC base/tray material as the preliminary impression material as well as the application of a new biometric wax occlusion rim. It retains the use of polymethylmethacrylate as the denture base material. This system also utilizes all the procedures used in the conventional five appointment system of complete denture construction.

Matched MeSH terms: Denture Design*

A new concept in denture design for patients with few remaining teeth: case reports

Ling BC

Quintessence Int, 1995 Dec;26(12):871-7.

PMID: 8596818

This article presents an alternative to the conventional swing-lock de sign of removable partial denture construction. It incorporates the principles of sectional dentures as well as the swing-lock concept and overcomes some of the limitations of conventional swing-lock dentures. I-bar struts and stainless steel keepers form part of the first section of the denture. The second part of the denture consists of the denture base with the artificial teeth and magnetic retention units. This system has been used successfully in a number of patients whose situations were suitable for the conventional swing-lock design.

Matched MeSH terms: Denture Design*

A three-visit, complete-denture technique utilizing visible light-cured resin for tray and base plate construction

Ling BC

Quintessence Int, 2004 Apr;35(4):294-8.

PMID: 15119715

This article describes a technique of constructing a set of maxillary and mandibular complete dentures in three visits instead of the usual five clinical appointments. This system of complete-denture construction is made possible because of the combined use of visible light-cured material as an impression tray and record base material, as well as the use of new biometric wax occlusion rims. Unlike some earlier techniques that use light-cured resin composites as the denture base materials, this method retains the use of heat-cured polymethylmethacrylate as the denture base material.

Matched MeSH terms: Denture Design*

Relationship of maxillary incisors in complete dentures to the incisive papilla

Isa ZM, Abdulhadi LM

J Oral Sci, 2012;54(2):159-63.

PMID: 22790408

We investigated the relationship of the maxillary central incisors to the incisive papilla in wearers of complete dentures. First, image analyzer software was used to examine the relationship of the midpoint of the incisive papilla to the labial surface of the maxillary central incisors on occlusal photographs of 120 maxillary casts from dentate Malaysian adults. Then, an Alma denture gauge was used to identify the position of the labial surface of the maxillary central incisors in relation to the midpoint of the incisive papilla in complete dentures from 51 patients who requested replacement dentures at the Faculty of Dentistry, University of Malaya. The mean incisor distance to the incisive papilla in dentate adults was 9.59 ± 1.00 mm, while the mean incisor distance to the incisive papilla in complete dentures was 6.34 ± 1.87 mm. Thus, in our sample of edentulous patients, the anterior teeth in complete dentures were positioned approximately 3 mm closer to the incisive papilla, as compared with the position of the central incisors in natural dentition, and did not duplicate the position of the natural anterior teeth.

Matched MeSH terms: Denture Design*

Regression methods to investigate the relationship between facial measurements and widths of the maxillary anterior teeth

Isa ZM, Tawfiq OF, Noor NM, Shamsudheen MI, Rijal OM

J Prosthet Dent, 2010 Mar;103(3):182-8.

PMID: 20188241 DOI: 10.1016/S0022-3913(10)60028-5

In rehabilitating edentulous patients, selecting appropriately sized teeth in the absence of preextraction records is problematic.

Matched MeSH terms: Denture Design*

Maxillary arch and central incisor dimensions of an ethnic Chinese population in relation to complete denture prosthodontics

Keng SB, Foong KW

Int Dent J, 1996 Apr;46(2):103-7.

PMID: 8930682

In the absence of pre-extraction records, investigators have used various methods to aid in the selection and placement of artificial teeth for complete dentures. Natural tooth position and size provide the dentist with an optimal guide. A study was conducted on a group of ethnic Chinese subjects where direct measurements were made of the arch size and width of the maxillary central incisor on stone casts. The anterior arch width represented by the inter-canine cusp tip distance was 35.74 +/- 2.17mm. The mesiodistal diameter of the maxillary central incisor was 8.85 +/- 0.59mm with a range of 7.60mm to 11.20mm. The results of this study was discussed against other findings on the Caucasian, Nigerian and Malay groups. The significance of artificial tooth selection for dentures was highlighted in relation to the results obtained from the study for the group of Chinese and other races.

Matched MeSH terms: Denture Design*

Full-arch metal-resin cement- and screw-retained provisional restoration for immediately loaded implants

Baig MR, Rajan G

J Oral Implantol, 2010;36(3):219-23.

PMID: 20553176 DOI: 10.1563/AAID-JOI-D-09-00048

Abstract This article describes the clinical and laboratory procedures involved in the fabrication of laboratory-processed, provisional, screw-retained, implant-supported maxillary and mandibular fixed complete dentures incorporating a cast metal reinforcement for immediate loading of implants. Precise fit is achieved by intraoral luting of the cast frame to milled abutments. Effective splinting of all implants is attained by the metal substructure and retrievability is provided by the screw-retention of the prosthesis.

Matched MeSH terms: Denture Design*

Closed hollow bulb obturator--one-step fabrication: a clinical report

Buzayan MM, Ariffin YT, Yunus N

J Prosthodont, 2013 Oct;22(7):591-5.

PMID: 23551843 DOI: 10.1111/jopr.12036

A method is described for the fabrication of a closed hollow bulb obturator prosthesis using a hard thermoforming splint material and heat-cured acrylic resin. The technique allowed the thickness of the thermoformed bulb to be optimized for weight reduction, while the autopolymerized seal area was covered in heat-cured acrylic resin, thus eliminating potential leakage and discoloration. This technique permits the obturator prosthesis to be processed to completion from the wax trial denture without additional laboratory investing, flasking, and processing.

Matched MeSH terms: Denture Design

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