Prosthodontics and Prosthodontology Commons^™

Comparative Evaluation Of Maxillary Partial Denture Frameworks Additively Manufactured With Different 3d Printing Techniques, Basma Refaat Fayad, Islam Heiba Dr, Eman Gamal Abdelghaffar, Ayman Hany Amin

Dentistry

Objectives: To compare the accuracy of fit, surface roughness, and microstructure of cobalt chromium (Co-Cr) maxillary removable partial denture (RPD) frameworks fabricated using direct metal laser melting (DMLS) and selective laser melting (SLM). Methods: A custom Kennedy Class II maxillary partial edentulous resin model was digitally scanned, and a virtual RPD framework was designed. Frameworks were fabricated using DMLS (Co-Cr, n = 8) and SLM (Co-Cr, n = 8), while a control group was produced using a hybrid digital-conventional protocol by lost-wax casting (CAST-Co- Cr, n = 8), in total 24 frameworks. Overall and point comparison adaptation was assessed using …

Effect Of Acid-Containing Drinks On Surface Roughness And Bacterial Accumulation Of Different Types Of Denture Base Materials, Sara Fikry Dr, Ayman Amin, Eman Khedr, Fatma Makkeya

Dentistry

No abstract provided.

The Impact Of Scan Spans On The Accuracy Of Three Intraoral Scanners: A Comparative Study, Lynn Labban, Louis Hardan, Cynthia Kassis

International Arab Journal of Dentistry

Objectives: In modern dentistry, intraoral scanners (IOSs) have become indispensable tools for capturing accurate digital impressions of patients’ dentition, facilitating the design and fabrication of various dental restorations. However, the accuracy of these scanners can be influenced by factors such as scan span, which refers to the extent of the area scanned during impression taking. Understanding the impact of scan span on scanner accuracy is crucial for optimizing clinical outcomes and ensuring the reliability of digital models. The aim of this study was to evaluate and compare the accuracy, encompassing both trueness and precision, of intraoral scanners (IOSs) across different …

Biomechanicalperformanceofimplant-Tooth-Supportedprostheses:Anumerical3dfiniteelementanalysis, Basma Refaat Fayad, Islam Heiba Dr, Al Hassan Diab

Dentistry

Objective:Toassessthebiomechanicalbehaviourofimplant-tooth-supported(hybrid)pros-theses,comparedwithanimplant-implant-supportedprosthesis,utilisingtwodifferentprostheticmaterials,employingfiniteelementanalysis(FEA).Method:Threedigitalmodels,derivedfromaCBCT-scannededentulousmandible,weredesigned:twohybridconfigurations(M1:distalimplant-firstpremolar;M2:mesialimplant-firstmolar)andanimplant-implant-supportedprosthesis(M3).Abiomechanicalmodellingworkflowwascarriedout(Mimicsforsegmentation,3-Maticforbone/mucosallayerrefinement,ExocadDentalCADandSolidWorksforimplants,abutmentandprosthe-sisintegration,andANSYSformeshingandFEA).Assumingisotropic/elasticmaterialproperties,zirconiaandpolyetherketoneketone(PEKK)wereselectedasprostheticmateri-als.Modelsweresubjectedtoastaticverticalload(100N).vonMisesstressandtotaldefor-mationwereanalysedtoevaluatestructuralresponses.Results:M3demonstratedthemostfavourablebiomechanicalprofile,exhibitingthelowestvonMisesstressmagnitudesalongsidethehighestoveralldeformation.Inhybridmodels(M1,M2),stressmaximawerelocalisedatthepontic−toothconnectorregionsand,inM1-PEKK,reached261MPainthescrew.Corticalboneandpreparedteethexhibitedhigherstressindis-tallyanchoredhybridsystems(M1)comparedtomesiallysupporteddesigns(M2),regardlessoftheprostheticmaterial.Comparativeanalysisrevealedthatzirconia-basedprosthesesgen-eratedhigherstressconcentrationsinbone(≤35MPa)comparedtoPEKK,whereasthePEKKprosthesisitselfexhibitedgreaterstructuraldeformation(70mminM1-PEKK).Conclusion:Hybridimplant-tooth-supportedprosthesescanactasareliablealternativetoimplant-implantonesandeliminatecantileverextensions;however,theiruseshouldbereservedforcarefullyselectedcasestoavoidbiomechanicalincompatibilities.

Effect Of Margin Thickness And Cement Gap On The Fabrication And Fit Accuracy Of Additively Manufactured Crowns In Definitive Resins With Different Filler Content, Mustafa Borga Dönmez, Gülce Çakmak, Çiğdem Kahveci, Amir H. Nejat, Burak Yilmaz, Pinar Altinci

School of Dentistry Faculty Publications

PURPOSE: To evaluate how commercially available composite resins in varying filler content affect the fabrication and fit accuracy (trueness and precision) of additively manufactured (AM) definitive crowns with different margin thickness and cement gaps by comparing them to subtractively manufactured (SM) polymer-infiltrated ceramic crowns. MATERIALS AND METHODS: Two identical unprepared mandibular right first molars were prepared by an experienced prosthodontist for crowns with either 0.5 mm or 1.0 mm chamfer margins, verified using silicone indexes and a periodontal probe, and then digitized with an industrial-grade scanner. These scan files were used to design reference crowns with either 50-µm or 80-µm …

Assessment Of Patient Knowledge And Awareness Of Prosthodontics For Student And Patient Education And Communication, Mijin Choi D.D.S., M.S., M.B.A., Facp, Tejal Gohil B.D.S., Cristina Osorio D.D.S., Hannah Jeong, Thomas S. Giugliano D.D.S.

The New York State Dental Journal

This study evaluates patient understanding of the scope of prosthodontic treatments. Utilizing an 11-question survey, 149 patients at a postgraduate prosthodontic clinic were queried. Data analysis included frequency summaries, cross-tabulations and Pearson Chi-square tests. Results showed 68.4% of respondents knew about the role of prosthodontists. Their main concerns were improving chewing (43.9%) and smile (42.6%), varying by age. While many recognized prosthodontists’ scope, cosmetic and complex dental treatments were less well known as prosthodontic specialties. This highlights a gap in patient awareness regarding the full range of prosthodontic services.

Evaluation Of Marginal And Internal Fit In Cad/Cam-Fabricated Indirect Restorations, Sara Adel Botros, Mohamed Samy Salama, Hend Sayed Ahmed, Ayman Helmy

Dentistry

No abstract provided.

Successful Flexible Bronchoscopic Extraction Of A Dental Foreign Body Aspirated Into The Left Mainstem Bronchus, Alexys Bolden, Hayden Cooper, Lynnetta Payne, Mark Coomes, Mark Cooper

Marshall Journal of Medicine

Foreign body aspiration (FBA) is a potentially life-threatening emergency that commonly occurs in children but varies widely in clinical presentation. Rapid diagnosis and intervention are of the utmost importance to prevent complications such as airway obstruction, infection, and lung injury. While uncommon in adults, most encountered causes occur in the setting of intoxication, neuromuscular weakness, or iatrogenic dental work. Those with dental prostheses are especially susceptible due to the partially attached nature, rendering the risk of accidental dislodgement. This report discusses an uncommon case wherein an 82-year-old male aspirated a dental bridge into his left mainstem bronchus during routine dental …

Pterygoid Implant-Retained Bridge Following Multiple Failed Alveolar Implants In Posterior Maxilla, Kouder Dakhallah Dds, Anish Gupta Dds, Joey Wilmot, Brian Giammalva Dds

The Journal of the Michigan Dental Association

The replacement of multiple teeth with dental implants in the posterior maxilla is challenging due to factors including low density bone and sinus morphology. When considering restoration of this region, prosthetic design will dictate implant placement. Additionally, planning must consider spacing between adjacent implants, spacing between implants and adjacent teeth, and irregular alveolar ridge morphology. These key measurements translate to the final prosthesis design and will affect cleanability and future oral hygiene maintenance. These characteristics subsequently affect overall longevity of the implants and prosthesis.

In the following case, multiple closely-placed implants presenting with poor cleanability consequently failed, requiring removal and …

You Don't Have To Go Far For Great Speakers, James Burns D.D.S.

New Orleans Dental Association News

NODA Annual Session Chair Dr. James Burns reminds members to register for the 2025 New Orleans Dental Conference before March 1. Featured speakers include Dr. Cyrous Ardalan, presenting on “Dental Trauma: Best Practices” and “Restorative-Driven Endodontics,” and Dr. Marco Brindis, discussing “Minimally Invasive Dentistry: A Philosophy.” Enjoy Mardi Gras safely!

Bond Strength Of Thermally Aged Cad/Cam Hybrid Nanoceramic Repaired With Nanohybrid Resin Composite, Mostafa Aboushahba, Sara H. Younis

Future Dental Journal

Purpose. To assess shear bond strength (SBS) of nanohybrid resin composite used to repair CAD/CAM Hybrid Nanoceramic ceramic after various surface treatments.

Materials and Methods. SHOFU HC Hybrid Ceramic disks were sliced to obtain circular-shaped specimens (n= 30) were obtained. All specimens were thermocycled (5000 thermal cycles), then specimens were divided into three groups according to the surface treatment performed (sandblasting, HF acid etching, and laser irradiation) (n = 10). Repair procedure with nanohybrid resin composite was performed. SBS values were obtained, and failure modes were determined. Data were statistically analyzed (P ≤ 0.05). Results. The highest SBS …

Comparison Of Treatment Outcome Of Occlusal Splints And Physiotherapy Regarding Their Effect On Posture: An In Vivo Pilot Study, Bouchra El Fassih, Amine El Zoghbi, Pascal El Braidy

International Arab Journal of Dentistry

Objectives: The primary objective of the research is to assess occlusal splints and physical exercise effect on posture. The secondary objective is to compare which treatment option has more positive feedback regarding posture adjustment.

Methods: twenty patients with temporomandibular disorders (TMD) were divided into two groups equally, one receiving occlusal splints as a treatment for TMD and the other group receiving physical therapy exercises. They underwent a clinical and postural examination at baseline, after 1 week, after 1 month and after 2 months of treatment. Postural stability was assessed using a force platform (SATEL). Subjects were evaluated in …

Evaluation Of Microtensile Bond Strength Of Composite Under Three Aging Conditions: A Comparative In Vitro Study, Fadi Hammoud, Louis Hardan, Maryse Nassif, Tala El Ghoul, Georges Najjar, Cynthia Kassis

International Arab Journal of Dentistry

Objectives: To investigate the effects of different in-vitro artificial aging protocols on the micro tensile bond strength (µTBS) of composite restorations applied to dentin.

Methods: A total of 88 teeth were prepared on dentin and divided into three distinct aging conditions and a control group : G1) Control group with no aging (n=22); G2) Thermal Cycling (Thermocycling) involving 10,000 cycles between 5°C and 55°C, with a dwell time of 20 seconds (n=22); G3) Mechanical Loading (Cyclic loading) with a 50 N load, a frequency of 1.5 Hz, and 10,000 cycles (n=22); G4) Combined Thermo-mechanical cyclic loading (TMCL) using …

Color Stability Of Conventional, 3d-Printed, And Milled Denture Teeth After Immersion In Coloring Agents: An In Vitro Study, Dany Nassif, Nancy Chemaly, Rim Bourgi, Carole Abi-Ghosn, Louis Hardan, Jihad Fakhouri

International Arab Journal of Dentistry

Objectives: This study investigates the color stability of denture teeth made from different materials when subjected to various staining solutions.

Methods: Forty-five A1 shade upper central incisors were divided into three groups: prefabricated, 3D printed, and milled denture teeth (N=45). Each group was further divided into three subgroups, with teeth immersed in coffee, wine, and artificial saliva for up to 120 days (n=5). ∆E values for color change were measured using an Optishade colorimeter.

Results: The type of teeth, type of solution, and immersion time had a significant effect on color stability (p < 0.001). Interactions between the three variables were all significant (p < 0.001). Conventional denture teeth showed slight color changes with saliva (ΔE = 1.256 by day 120), moderate changes with wine (ΔE = 2.893), and more significant changes with coffee (ΔE = 5.208). Milled denture teeth exhibited no color changes with saliva, noticeable changes with wine (ΔE = 5.359), and moderate changes with coffee (ΔE = 3.137). 3D printed denture teeth showed no color changes with saliva, but increased changes with wine (ΔE = 2.533) and highly significant changes with coffee (ΔE = 10.546). Coffee consistently caused the highest ΔE values, especially in 3D printed teeth.

Conclusions: The study …

Comparative Evaluation Of Marginal And Internal Fit Of Zirconia Crown Designed Using Artificial Intelligence And Cad-Cam Software: A Systematic Review, Pritesh Gangde, Sweta Kale Pisulkar, Arushi Beri, Pritam Das

International Arab Journal of Dentistry

Introduction: The long-term performance of dental restorations depends on their internal and marginal fits. Improvements in the fit of restorations, especially zirconia crowns, have been investigated through the use of diverse materials, manufacturing processes, and impression techniques.

Objectives: The purpose of this review was to examine the internal and marginal fit of zirconia crowns made with CAD/CAM software with artificial intelligence (AI) software.

Methods: Using a combination of keywords and MeSH terms, the literature search was carried out across seven databases: PubMed, Scopus, Web of Science, Cochrane Library, Embase, ProQuest, and ScienceDirect from inception till 1st of …

Stress And Burnout Level Among Bhutanese Dentists And Medical Officers In Bhutan, Karma Zangmo

Chulalongkorn University Theses and Dissertations (Chula ETD)

Healthcare professionals, particularly dentists and physicians, are at high risk of stress and burnout due to long working hours, heavy workloads, clinical decision-making responsibilities, and the need for continuous knowledge updates. This study aimed to assess stress and burnout levels among Bhutanese dentists and physicians. A cross-sectional survey was conducted using online questionnaires distributed to 85 dentists and 325 physicians, with response rates of 87.7% and 52.6%, respectively. Stress was measured using the 14-item Perceived Stress Scale (PSS), and burnout was assessed with the 22-item Maslach Burnout Inventory (MBI). Among dentists, 97.8% reported stress, with 91.8% at moderate levels. Among …

Influence Of Shade On Color Reproducibility Of Lithium Disilicate Crowns, Naphat Santiworanart

Chulalongkorn University Theses and Dissertations (Chula ETD)

Objective: This study aimed to evaluate the influence of nominal shade on the color reproducibility of CAD-CAM lithium disilicate glass ceramic crowns.Materials and Methods: An in vitro study was conducted on 16 CAD-CAM lithium disilicate crowns (IPS e.max CAD LT) fabricated in four VITA Classical shades (A3, B3, C3, D3; N=4 per group). Each crown was cemented on a corresponding polymethylmethacrylate (PMMA) abutment of matching shade. Shade determination was performed using a spectrophotometer and an intraoral scanner under controlled conditions. Color trueness was assessed against the VITA Classical shade guide using exact match and broad acceptance criteria. The L*, a*, …

Effect Of Printing Orientation And Surface Treatment On The Surface Roughness, Shear Bond Strength, And Flexural Strength Of 3d-Printed Provisional Materials, Kornrawee Wiroonsri

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aimed to evaluate the influence of printing orientation and surface treatment on the surface roughness, shear bond strength (SBS), and flexural strength of three-dimensional (3D)-printed provisional resin materials. Four printing orientations (0°, 45°, 60°, and 90°) and four surface treatments (no treatment, airborne particle abrasion (APA), tetrahydrofuran (THF), and HC primer) were investigated. A total of 320 specimens were fabricated, post-processed, and tested according to ISO standards. Among these, 240 disk-shaped specimens were utilized for surface roughness assessment, conducted using a non-contact profilometer, and for SBS evaluation through a notched-edge shear test. Additionally, 80 rectangular bar specimens were …

Physico-Mechanical And Antibacterial Properties Of Resin-Based Dental Sealants Modified With Graphene Oxide Nanoparticles, Ploypim Kraisintu

Chulalongkorn University Theses and Dissertations (Chula ETD)

Objectives: This study evaluated the effects of incorporating graphene oxide (GO) nanoparticles at different concentrations (0.1, 0.25, and 0.5 wt%) into resin-based pit and fissure sealants. Mechanical, physical, antibacterial, and cytotoxicity were tested and compared with a commercial reference material.Materials and Methods: An experimental resin-based sealant was formulated and reinforced with GO (G2–G4), while an unmodified resin served as control (G1) and Helioseal® F Plus as commercial comparison (G5). GO morphology was characterized by TEM. Specimens (n=240) were tested for Vickers microhardness, viscosity, surface roughness (DRa) after simulated toothbrushing, and fluorescence (% blue channel). Antibacterial activity against Streptococcus mutans was …

Occlusal Analysis Using A Novel Classification Of Static And Dynamic Articulations In Tmd And Non-Tmd Patients, Uthai Uma

Chulalongkorn University Theses and Dissertations (Chula ETD)

Background: Temporomandibular disorders (TMD) are multifactorial conditions affecting masticatory systems. While occlusal morphology has been suggested as a contributing factor, functional, behavioral, and postural elements may play a more prominent role. This study aimed to evaluate demographic, clinical, occlusal, and functional characteristics associated with TMD in a Thai patient population using a novel articulation classification. Methods: A retrospective analysis of 872 participants (684 TMD, 188 non-TMD) was conducted. Data included demographic characteristics, postural and habitual behaviors, occlusal morphology, articulation classification, articulation ratios, mandibular range of motion, and TMD diagnostic categories. The articulation classification and ratios were designed and tested for …