Flabby Ridge, a Challenge for Making Complete Dentures

In the case of old mobile denture wearers, one of the main problems is related to the dentures’ retention and insufficient stability. Our goal was to improve support and stability using a different type of final impression, with different types of impression materials. In this study we chose a number of three complete edentulous patients who presented for complete oral rehabilitation. They were wearing full acrylic dentures with poor support and stability. Complete examination revealed the presence of the flabby ridge. The impression methods for the prosthetic fields with a flabby ridge differ from the classical method by using techniques that involve the use of at least two impression materials with fluid consistency to record all the details of the prosthetic fields in the final impression, this being done in two steps; the impression of the flabby ridge areas must be done without pressure, in its resting position. The impression methods we applied led to the expected results, and the dentures succeeded in offering the patient the desired functional comfort. Using fluid impression material for the flabby ridge in a resting position, and a fenestrated custom tray, offered a good quality in adaptation, maintenance and stability of the final dentures.

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Efficacy of silicone as a dowel impression material

Bangladesh Journal of Medical Science ◽

10.3329/bjms.v11i4.12614 ◽

2012 ◽

Vol 11 (4) ◽

pp. 331-334

Author(s):

Tariq Hasan Howlader ◽

Mohammad Khursheed Alam ◽

Alia Sultana

Keyword(s):

Medical Science ◽

Void Formation ◽

Injection Technique ◽

Absolute Accuracy ◽

Impression Material ◽

Impression Materials ◽

Different Types ◽

Similar Accuracy

Background: Different types of impression materials and different procedures or methods have been introduced in Dentistry for preparing dowel crown.Materials and Methods: Injection technique with silicone impression materials are being extensively used by the materials to get an accurate impression. But whether this material neither ensures similar accuracy nor produces absolute accuracy. This study evaluate silicone impression material was efficient enough to produce nearest to actual intraradicular surface reproduction by assessing the void formation and dimensional accuracy.Conclusion: By assessing all the parameters the silicone impression material was proved to be the efficient for intraradicular surface reproduction. DOI: http://dx.doi.org/10.3329/bjms.v11i4.12614 Bangladesh Journal of Medical Science Vol. 11 No. 04 Oct12

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In Vitro Comparative Evaluation of Different Types of Impression Trays and Impression Materials on the Accuracy of Open Tray Implant Impressions: A Pilot Study

International Journal of Dentistry ◽

10.1155/2017/6306530 ◽

2017 ◽

Vol 2017 ◽

pp. 1-8 ◽

Cited By ~ 2

Author(s):

Sonam Gupta ◽

Aparna Ichalangod Narayan ◽

Dhanasekar Balakrishnan

Keyword(s):

Reference Model ◽

Coordinate Measuring Machine ◽

Dimensional Accuracy ◽

Impression Material ◽

Impression Materials ◽

Significant Difference ◽

Different Types ◽

Measuring Machine ◽

The Difference

Purpose. For a precise fit of multiple implant framework, having an accurate definitive cast is imperative. The present study evaluated dimensional accuracy of master casts obtained using different impression trays and materials with open tray impression technique.Materials and Methods. A machined aluminum reference model with four parallel implant analogues was fabricated. Forty implant level impressions were made. Eight groups (n=5) were tested using impression materials (polyether and vinylsiloxanether) and four types of impression trays, two being custom (self-cure acrylic and light cure acrylic) and two being stock (plastic and metal). The interimplant distances were measured on master casts using a coordinate measuring machine. The collected data was compared with a standard reference model and was statistically analyzed using two-way ANOVA.Results. Statistically significant difference (p<0.05) was found between the two impression materials. However, the difference seen was small (36 μm) irrespective of the tray type used. No significant difference (p>0.05) was observed between varied stock and custom trays.Conclusions. The polyether impression material proved to be more accurate than vinylsiloxanether impression material. The rigid nonperforated stock trays, both plastic and metal, could be an alternative for custom trays for multi-implant impressions when used with medium viscosity impression materials.

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To Evaluate the Effect of Storage Temperature on the Linear Dimensional Accuracy of Delayed and Repeat Pours of Two Addition Silicone Impression Materials

Journal of Advances in Medicine and Medical Research ◽

10.9734/jammr/2019/v30i1130250 ◽

2019 ◽

pp. 1-20

Author(s):

Manish Sen Kinra

Keyword(s):

Storage Temperature ◽

Dimensional Accuracy ◽

Clinical Situation ◽

Impression Material ◽

Type Iv ◽

Impression Materials ◽

Group I ◽

Different Types ◽

Significant Change ◽

Standard Steel

Background: Addition silicone elastomers are the most commonly used impression materials for making final impression for fpd, implants and rpd. The dimensional stability and accuracy of addition silicone impression material are influenced by the storage time, temperature and repeat pour. Aim and Objectives: To evaluate the accuracy of two different types of addition silicone elastomeric impression materials, stored at a different temperature. To evaluate the accuracy of two different types of addition silicone elastomeric impression materials, after delayed and repeated pour. To compare the linear dimensions of two different types of addition silicone elastomeric impression materials with a control die. Materials and Methods: A machined standard steel master die and metal custom impression tray was made for making a final impression of machined standard steel master die. Final impression was made by using two different brands of addition silicone impression materials (Aquasil Ultra Impression material, Dentsply/ Caulk, Milford, D & 3M ESPE). Double step putty light body impression technique was used for making final impression. In this manner total numbers of 80 impressions were made and they were divided into two groups Group I and Group II. To study the effect of delayed pours and storage temperature were divided into 4 sub-groups, 10 impressions each. All the ten impressions of each sub groups were stored at 40°C in acrylizer, 24 hours at -10°C, 48 hours at -2°C and 1 week respectively at 0°C inside a refrigerator in a sealed plastic bags before been poured with type IV die stone. To study the effect of repeat pours on the accuracy of stone casts, all ten impressions of each sub groups was immediately re poured with type IV die stone after the removal of first set of casts. Thus again a fresh set of 80 cats were obtained having 40 casts belongs to each group. Results: When impressions were stored at 40°C in acrylizer, 24 hours at -10°C, 48 hours at -2°C and 1 week respectively at 0°C addition silicone impression materials did not show any significant change when compared to control samples. Conclusion: Both types of addition silicone elastomeric impression materials maintained their accuracy after delayed poured and repeat pours. Storing impressions under different conditions caused no adverse effect upon the accuracy of both types of addition silicone elastomeric impression materials. There was no significant change in the dimensions of stone casts obtained from both impression materials as compared to the dimensions of a master die. If addition silicone impression material is delayed pour up to 1 week, repeat pour and exposed from -10°C to 40°C in that clinical situation also linear dimensional accuracy will not be adversely effected.

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Comparison of speech articulation and intelligibility in palatally contoured dentures using a novel rugae duplication technique: A clinical study

International Journal of Dental Research ◽

10.14419/ijdr.v3i2.5076 ◽

2015 ◽

Vol 3 (2) ◽

pp. 15 ◽

Cited By ~ 1

Author(s):

Priya Vaswani ◽

Pronob Sanyal ◽

Ankur Prajapati

Keyword(s):

Rating Scale ◽

Statistical Significance ◽

Matched Pair ◽

Impression Material ◽

Impression Materials ◽

Wax Pattern ◽

Speech Pathologist ◽

Activity Loss ◽

Edentulous Patients ◽

Eventual Loss

Background: Speech is essential to human activity. Loss of teeth is usually accompanied by eventual loss of oral morphology responsible for articulation. Palatal rugae contour has an important role in phonetics by production of linguo-palatal sounds that involves the contact between tongue and palate.Objectives: To analyze the improvement in linguo-palatal sounds by duplicating the existing rugae in maxillary complete denture prosthesis using two different impression materials in shallow, medium & deep palatal vault configuration.Methods: Twenty four completely edentulous patients were selected that were categorized eight in each category of shallow, medium & deep palatal vaults. Existing rugae were duplicated using mucocompressive and mucostatic impression material, wax pattern obtained through these impressions were incorporated in maxillary dental prosthesis. Later speech was recorded and analyzed by a speech pathologist with an aid of speech rating scale over a period of eight weeks.Results: Mann-Whitney U test and Wilcoxon matched pair test showed statistical significance in speech improvement (p<0.05) when mucostatic impression derived rugae pattern was incorporated in upper arch prosthesis.Conclusion: Using the presently described rugae duplication technique, speech improvement is rapid in case when mucostatic impression material was used.

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Oral Rehabilitation utilizing Complete Dentures

Annals of Japan Prosthodontic Society ◽

10.2186/ajps.9.216 ◽

2017 ◽

Vol 9 (3) ◽

pp. 216-217

Author(s):

Hiroshi Murata ◽

Hisashi Koshino

Keyword(s):

Complete Dentures ◽

Oral Rehabilitation

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The use of vinyl polysiloxanes and quick setting epoxies in paleontology

Journal of Paleontology ◽

10.1017/s002233600001934x ◽

1989 ◽

Vol 63 (2) ◽

pp. 256-256 ◽

Cited By ~ 1

Author(s):

Patrick Leiggi

Keyword(s):

Fast Method ◽

Impression Material ◽

Impression Materials ◽

Dental Impression

Quick setting dental impression materials are nothing new in the paleontology laboratory. In a paleontological note published in the Journal of Paleontology on “The Use of Dental Impression Material For Molding Macrofossils” (Quilty & Williams, 1975), the products Xantopren and Optosil were introduced as a simple and fast method of obtaining precision molds in 1-3 minutes. Since the mid-1970's these products have been replaced by vinyl polysiloxanes.

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Effect of mandibular complete dentures relining on occlusal force distribution using T-scan system

Bulletin of the National Research Centre ◽

10.1186/s42269-021-00537-7 ◽

2021 ◽

Vol 45 (1) ◽

Author(s):

Eman M. Ibraheem ◽

Hisham S. ElGabry

Keyword(s):

Trial Registration ◽

Force Distribution ◽

Complete Dentures ◽

Clinical Trial Registration ◽

Occlusal Force ◽

Left Posterior ◽

Before And After ◽

Soft Denture Liner ◽

Edentulous Patients ◽

Posterior Area

Abstract Background This study aimed to evaluate the effect of mandibular complete dentures relining using soft relining material on the distribution of various occlusal forces using T-Scan system. Fifty completely edentulous patients having their conventional complete dentures earlier fabricated and utilized were selected for this study. Patients were controlled diabetics, characterized by having their residual alveolar ridges moderately developed and lined with firm mucoperiosteum. Mandibular complete dentures were relined with soft denture liner and T-Scan device was used for occlusal force distribution measurement prior to denture relining and three months thereafter the relinning procedure. Results Comparison between occlusal forces percentages before and after denture relining revealed that occlusal forces percentages was significantly lower after denture relining in anterior area, significantly higher after denture relining in right posterior area, where it was insignificantly higher after relining in left posterior area. Conclusions Our findings revealed that the use of soft denture liner for mandibular complete denture relining significantly improved the occlusal load distribution. Clinical trial registration Trial registration NCT, NCT04701970. Registered 23/11/2020—Retrospectively registered, https://clinicaltrials.gov/ct2/show/NCT04701970

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Restorative Space Analysis by Jaw Motion Tracking Using a Template in Completely Edentulous Patients

Applied Sciences ◽

10.3390/app11093933 ◽

2021 ◽

Vol 11 (9) ◽

pp. 3933

Author(s):

Chol-Gwan Han ◽

Young-Bum Park ◽

June-Sung Shim ◽

Jong-Eun Kim

Keyword(s):

Computer Aided Design ◽

Motion Tracking ◽

Alternative Technique ◽

Optical Scanner ◽

Movement Data ◽

Impression Materials ◽

Computer Aided ◽

Edentulous Patients ◽

Manufacturing Technologies ◽

Opening And Closing

Improvements in computer-aided design/computer-aided manufacturing technologies have led to multiple attempts being made to simplify and improve the workflow of prosthesis fabrication for completely edentulous patients. However, most attempts still involve the conventional methods of impression-making and recording the maxillomandibular relationships using alginate, rubber impression materials, and wax materials. In the case of a completely edentulous arch, the presence of movable tissues and the absence of stable landmarks make it difficult to perform direct digitization using an intraoral scanner and to digitally determine the vertical dimension. In the alternative technique described herein, data are obtained by scanning a template such as the patient’s existing old dentures and jaw movement data using target materials and an optical scanner, and an appropriate maxillomandibular relationship that has the desired restorative space is determined on the basis of the obtained trajectory of mandibular movements while opening and closing the mouth. After designing dentures on the basis of the newly established maxillomandibular relationships and performing a try-in process, the final dentures can be manufactured. This alternative technique can reduce the need for multiple visits and complex procedures, improving the workflow for fabricating prostheses with the correct maxillomandibular relationships for individual patients.

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How Do Parameters of Implant Primary Stability Correspond with CT-Evaluated Bone Quality in the Posterior Maxilla? A Correlation Analysis

Materials ◽

10.3390/ma14020270 ◽

2021 ◽

Vol 14 (2) ◽

pp. 270

Author(s):

Ji-Hyun Kim ◽

Young-Jun Lim ◽

Bongju Kim ◽

Jungwon Lee

Keyword(s):

Bone Density ◽

Bone Quality ◽

Objective Assessment ◽

Primary Stability ◽

Insertion Torque ◽

Hounsfield Units ◽

Stability Parameters ◽

Posterior Maxilla ◽

Different Types ◽

Edentulous Patients

The aim of the present study was to evaluate correlations between bone density and implant primary stability, considering various determinants such as age, gender, and geometry of implants (design, diameter). Bone density of edentulous posterior maxillae was assessed by computed tomography (CT)-derived Hounsfield units, and implant primary stability values were measured with insertion torque and resonance frequency analysis (RFA). A total of 60 implants in 30 partially edentulous patients were evaluated in the posterior maxilla with two different types of dental implants. The bone density evaluated by CT-derived Hounsfield units showed a significant correlation with primary stability parameters. The bone quality was more influenced by gender rather than age, and the type of implant was insignificant when determining primary stability. Such results imply that primary stability parameters can be used for objective assessment of bone quality, allowing surgical modifications especially in sites suspected of poor bone quality.

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Digital Workflow to Fabricate Complete Dentures for Edentulous Patients Using a Reversing and Superimposing Technique

Applied Sciences ◽

10.3390/app11135786 ◽

2021 ◽

Vol 11 (13) ◽

pp. 5786

Author(s):

Hwa-Jung Lee ◽

Jeongho Jeon ◽

Hong Seok Moon ◽

Kyung Chul Oh

Keyword(s):

Additive Manufacturing ◽

Computer Aided Design ◽

Digital Data ◽

Complete Dentures ◽

Intraoral Scanner ◽

Digital Workflow ◽

Denture Base ◽

Scan Data ◽

Edentulous Patients ◽

Aided Design

This technical procedure demonstrates a 4-step completely digital workflow for the fabrication of complete dentures in edentulous patients. The digital scan data of the edentulous arches were obtained using an intraoral scanner, followed by the fabrication of modeless trial denture bases using additive manufacturing. Using the trial denture base and a wax rim assembly, the interarch relationship was recorded. This record was digitized using an intraoral scanner and reversed for each maxillary and mandibular section individually. The digital scan data directly obtained using the intraoral scanner were superimposed over the reversed data, establishing a proper interarch relationship. The artificial teeth were arranged virtually and try-in dentures were additively manufactured. Subsequently, the gingival and tooth sections were additively manufactured individually and characterized. Thus, fabrication of digital complete dentures can be accomplished using digital data characteristics. The workflow includes data acquisition using an intraoral scanner, data processing using reverse engineering and computer-aided design software programs, and additive manufacturing.

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