Endodontics and Endodontology Commons^™

Enhancing Severely Compromised Premolar Strength: Role Of Cusp Reduction Design In Cad/Cam Composite Restorations, Shehabeldin Mohamed Saber Prof.Dr.

Dentistry

The objective of this study was to assess the effect of different designs and depths of cusp reduction on fracture resistance of maxillary permanent premolars restored with CAD/CAM composite restorations. A total of 42 sound maxillary premolars were used. Standardized MOD cavities were prepared in all specimens. Teeth were randomly divided according to form of cusp reduction into three main groups (n = 14); G1:MOD cavities restored with inlays with no cusp reduction, G2:MOD cavities restored with overlays with buccal and palatal anatomical cusps reduction, G3; MOD cavities restored with overlays with buccal and palatal flat cusps reduction. Groups 2 …

Endodontic Access Through Zirconia Crowns: A Comparative Evaluation Of 3d Guided Versus Free-Handed Techniques, Maryam Alrughaib

Theses and Dissertations

Objective:

Accessing canals through full-coverage zirconia crowns is challenging and may increase the risk of misdirection, excessive dentin removal, and prolonged chair time. Guided endodontic access has been proposed to improve efficiency and precision. This study compared the accuracy and time efficiency of guided versus free-hand endodontic access through zirconia restorations. The hypothesis was that guided access would enhance canal localization precision and significantly reduce access time.

Methods:

Thirty-two extracted maxillary premolars were restored with 1-mm–reduced monolithic zirconia crowns (3Y-TZP, Katana HTML, Kuraray, Japan) and mounted in Modupro models. Teeth were assigned to two groups (n = 16 each): guided …

Comparative Evaluation Of The Solubility Of Three Commonly Used Root Canal Sealers When Exposed To Xylene And Endosolv: An In Vitro Study, Aparna Palekar, Piyush Mantri, Basawaraj Biradar, Mukund Singh, Vaidehi Joshi, Pushpal Ingle

International Arab Journal of Dentistry

Objectives: This in vitro study compared the solubility of three root canal sealers, AH Plus (epoxy resin-based), MTA Fillapex (MTA-based), and Cerafill RCS (bioceramic), in two solvents: Xylene and Endosolv.

Methods: Sixty standardized cylindrical specimens were prepared using the three sealers of interest. The specimens were divided into six groups (n = 10) and immersed in either Xylene or Endosolv for 10 minutes. Solubility was assessed by calculating the percentage weight loss before and after immersion. Data were analysed using one-way ANOVA and Tukey’s post hoc test (α= 0.05).

Results: All sealers exhibited statistically significant solubility in both solvents (p …

Musculoskeletal Disorders In Dentistry: An Insight Into Dental Techniques And Practices, Mehwash Kashif, Aman Ashar, Amna Rehman, Abdul Aleem, Sidra-Tul-Muntaha Hashmi, Muhammad Yousuf Ali

Journal of Dentistry Indonesia

Objective: Musculoskeletal disorders (MSDs) are common workplace hazards in dentistry resulting from poor ergonomics and static postures, which lead to back, neck, and upper limb (shoulder, elbow, wrist, and hand) problems among dentists, resulting in harm to their health, productivity, and career. This study aimed to assess the frequency of MSDs, risk factors related to MSDs, and awareness of ergonomics among clinicians. Methods: Data were collected from 400 dental professionals, including house officers, postgraduate trainees, general dentists, and teachers/consultants, each with at least 12 months of practice. Data were collected using a structured, closed-ended questionnaire. Before data collection, ethical approval …

Matrix Metalloproteinase-9 (Mmp-9) Levels In Dentinal Fluid As A Diagnostic Biomarker For Irreversible Pulpitis, Aryo Megantoro, Valeria Widita Wairooy, Ratna Meidyawati, Endang Winiati Bachtiar

Journal of Dentistry Indonesia

Objective: Pulpitis is an inflammatory condition of the dental pulp. The inflammatory status can be accurately assessed by histological examination. Biomarkers, such as matrix metalloproteinases (MMPs), are effective indicators of inflammation severity. Among these, matrix metalloproteinase-9 (MMP-9) has emerged as a key mediator of inflammatory processes associated with pulpitis. However, its clinical application as a biomarker remains limited owing to challenges in its extraction. This study aimed to evaluate the effectiveness of MMP-9 extracted from the dentinal fluid as a biomarker for pulpitis. Methods: Dentinal fluid was collected using the blunt tip of a sterile paper point, following clean …

Automated Assessment Of Periapical Health Based On The Radiographic Periapical Index Using Yolov8, Yolov11, And Yolov12 One-Stage Object Detection Algorithms, Shehabeldin Mohamed Saber Prof.Dr., Ahmed A. Torky Phd

Dentistry

This study investigates the application of recent YOLO (You Only Look Once) algorithms for automated detection and classification of apical periodontitis using the Periapical Index (PAI) scoring system (1–5). A dataset of 699 digital periapical radiographs was collected from diverse sources, de-identified, and annotated by calibrated experts before splitting into training, validation, and testing sets. Three deep learning models (YOLOv8m, YOLOv11m, YOLOv12m) were trained and their performance was evaluated using Precision, Recall, F1 score, mean average precision (mAP50), Intersection over union (IoU), and confusion matrices. Two-sided McNemar’s exact test was further conducted to compare models on lesion-level outcomes. The results …

Articulator Volume 31, Issue 4

Metro Denver Dental Society Articulator Magazine

The 4^th Quarter 2025 of the MDDS Articulator Magazine offers a preview of the 2026 Rocky Mountain Dental Convention, taking place January 22–24 in Denver. The collection spotlights RMDC speakers and the future of dentistry, from the rise of AI and the shift toward integrated whole-health care to the hidden challenges of chronic illness, and a commitment to preserving natural dentition. The articles challenge dental professionals to rethink assumptions, embrace interdisciplinary collaboration and adopt more personalized and evidence-driven approaches to care.

Comparative Evaluation Of Heat-Treated Retreatment Files On Canal Transportation And Dentin Thickness In Endodontically Treated Teeth: An In Vitro Cbct Study, Monisha Bhate, Pradeep Solete, Aparna Mohan

International Arab Journal of Dentistry

Introduction: Non-surgical retreatment is a conservative approach for managing recurrent endodontic infections requiring efficient removal of obturating material while preserving dentin. Retreatment file systems,through their design and function,plays a vital role in ensuring effective cleaning and minimal structural compromise.

Methods: Forty-five extracted mandibular molars were decoronated and obturated at a standardized root length of 16 mm in both mesial canals. Samples were divided into three groups (n=15): Group 1 – SoliteRS3, Group 2 – Dentsply Protaper Universal Retreatment Files and Group 3 – Neoendo Retreatment Files. Pre- and postoperative CBCT scans were used to assess remaining dentin thickness, …

Cytotoxicity And Osteogenic Potentials Of Mesenchymal Stem Cells Via A Novel Formulation Of Mineral Trioxide Aggregate: An In Vitro Study, Ahmed Elgendi, Ehab Hassanien, Mohamed Nagy, Iman Fathy, Ashraf Abu Seida, Elhassan Hassanein

International Arab Journal of Dentistry

Objectives: Root perforations can lead to periodontitis and alveolar bone loss. This study compared cytotoxicity and osteogenic potential of zirconia-containing mineral trioxide aggregate (MTA) Matreva (MAT group) to MTA Angelus (ANG group) as root perforation repair materials.

Methods: Bone marrow mesenchymal stem cells (BM-MSCs) were extracted from two albino rats and cultivated. The cytotoxicity of the studied materials was determined using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay at three time points: 3, 7, and 14 days. The evaluated materials were employed to guide the osteogenic differentiation of BM-MSCs into osteoblasts. The osteogenic impact was evaluated by assessing calcium …

Evaluation Of Anti-Bacterial Efficacy Of Ginger, Resin Gum, And Nigella Sativa Irrigants Against Enterococcus Faecalis: An In Vitro Study, Iman El Ghazzawy, Leen Imad Hasbini, Reem Chamseddine, Wael Betbout, Roula Abiad

International Arab Journal of Dentistry

Objectives: To evaluate the antibacterial efficacy of Ginger, Resin Gum, and Nigella Sativa, against Enterococcus Faecalis.

Methods: Thirty-eight extracted single-rooted premolars were inoculated with E.faecalis, except the negative control, and incubated for 4 weeks. After instrumentation samples were divided into 4 groups (n=7) according to final irrigation: NaOCl+EDTA (Group A), Nigella sativa (B), Resin Gum (C), Ginger (D), plus 2 control groups (n=5): Saline (E), and Saline without bacterial inoculation (F). Cultures were collected at baseline and after irrigation.

Results: One-way ANOVA showed that in groups A-D a statistically significant reduction of bacterial load was observed at …

The Science Of Sound: Studying The Cognitive, Emotional, And Physiological Effects Of Frequency, Genre, And Music, Jett Yarborough

Senior Honors Theses

Music influences emotion, physiology, and cognition, yet little is known about how the frequency it is tuned to affects these influences. Prior research has shown that music tuned to 432 Hz can reduce stress, lower blood pressure, and improve sleep. My colleagues and I conducted two studies to investigate this. Our research found that music tuned to 432 Hz promotes a significant increase in memory retention and induces a state of focus and relaxation. These results suggest that shifting from the standard tuning frequency of 440 Hz to 432 Hz could have a profoundly positive impact on our daily lives. …

Neutral Zone Vs. Conventional Denture Fabrication: A Randomized Crossover Study On Denture Performance, Karthik Kannaiyan, Arunima Chauhan, Vijayendranath Nayak, Riyshmaa Devendaran, Dashmita Peterson, Pavittra Kanesan, Vityaa Lakshmi

Journal of Dentistry Indonesia

Objectives: It is challenging to achieve satisfactory outcomes in a complete denture for patients with resorbed residual ridges. Utilization of neutral zone techniques to guide posterior denture tooth arrangement and denture base contouring has been considered for many decades. However, the evidence is still not enough to revise protocols. This study aimed to compare patient satisfaction and stability of neutral zone denture with conventional denture. Methods: A crossover clinical trial was conducted among patients with resorbed mandibular ridges. Each participant received two sets of dentures: one fabricated using the neutral zone technique and one using the conventional method, in a …

Cooling Protocols Impact On Nickel-Titanium Rotary Instruments Cyclic Fatigue Resistance Under Extreme Curvatures And Sodium Hypochlorite, Palak Ravjibhai Ranparia, Chintan Joshi, Mona Somani, Aashray Patel, Urooj Desai, Janki Prajapati

Journal of Dentistry Indonesia

Objective: In this work, Hyflex CM, TruNatomy, and Plex V heat-treated nickel titanium rotary instruments were evaluated at body temperature (36 °C ± 1 °C) with and without a cooling protocol to assess the cyclic fatigue resistance. Methods: A 90° curved stainless-steel block was used for cyclic fatigue tests on 60 randomly selected rotary instruments, divided into two groups of 30: body temperature (n = 10) and body temperature with cooling (n = 10). Instruments were further subdivided into 6 groups of 3 different instruments. Cooling protocol group instruments received 5-second spray cooling every 30 seconds, along with continuous 5% …

Centering And Shaping Abilities Of Three Different Cross-Section Rotary Systems In Curved Canals Using Cbct, Sherif Shafik

Dentistry

ABSTRACT The aim of the study was to examine the centering and shaping abilities of the E3 Azure, T Blue and XPRS rotary devices in severely curved root canals utilizing CBCT. 51 mesial roots were used in this study, then distributed into three groups of 17 mesial canals each according to the instrumentation technique: T-Blue, E3 Azure and XPS. The final apical size of instrumentation was 30/0.04 for all groups. At 2 mm, all pairwise comparisons were statistically significant, with Azure showing the highest transportation, followed by T-Blue, and XPS showing the least (p< 0.001). At 4 mm and 6 mm, Azure and T-Blue showed significantly higher transportation than XPS (p< 0.001). For XP-Shaper files, centering ratios followed a descending order from 6 mm to 4 mm and were lowest at 2 mm, with all pairwise comparisons being statistically significant (p< 0.001). it was concluded that XPS show lesser transportation and better centering ability.

Centering And Shaping Abilities Of Three Different Cross-Section Rotary Systems In Curved Canals Using Cbct, Muhammed Ahmed Omar Abouel Seoud Phd, Maha Nassar

Dentistry

he aim of the study was to examine the centering and shaping abilities of the E3 Azure,T Blue and XPRS rotary devices in severely curved root canals utilizing CBCT. 51 mesial rootswere used in this study, then distributed into three groups of 17 mesial canals each according to theinstrumentation technique: T-Blue, E3 Azure and XPS. The final apical size of instrumentation was30/0.04 for all groups. At 2 mm, all pairwise comparisons were statistically significant, with Azureshowing the highest transportation, followed by T-Blue, and XPS showing the least (p< 0.001). At 4mm and 6 mm, Azure and T-Blue showed significantly higher transportation than XPS (p< 0.001).For XP-Shaper files, centering ratios followed a descending order from 6 mm to 4 mm and werelowest at 2 mm, with all pairwise comparisons being statistically significant (p< 0.001). it wasconcluded that XPS show lesser transportation and better centering ability (PDF) Centering and Shaping abilities of three different cross-section rotary systems in …