Digital Commons Network^™

Pathways For Recognition: Indigenous Land Rights In Panamá, Caruna Gillespie, William Ascher

CMC Senior Theses

Indigenous communities in Panamá face the same challenge that many Indigenous communities experience around the globe: a lack of recognition of their land rights. Over the last several decades, the Panamanian government has developed policies and ratified international agreements that recognize Indigenous rights. The comarcas that institutionalize these rights have had some success. However, despite a seemingly progressive framework for recognition, Indigenous communities across the country continuously have their rights violated by conservation projects and resource extraction efforts in the name of economic development. The Panamanian government crafts recognition policies using loopholes, exceptions, and ambiguous language that allow for them …

Evaluation Of Double Crown Attachments Made Of Polyether –Ketoneketone Secondary Crowns Combined To Primary Crowns Of Two Different Materials For 2-Implant Retained Overdentures, Esraa Wefky Shawkat Elsaba, Noha Ahmed Mansour, Heba Nabil Awad, Radwa Mohsen Kamal Emera

Mansoura Journal of Dentistry

Objective: To assess the retention force using a digital forcemeter, the peri-implant soft tissue health, and the periimplant marginal bone loss of two implant-retained mandibular complete overdentures with double crown attachments made of polyetherketone- ketone (PEKK) secondary crowns combined to primary crowns of two different materials Methods Fourteen healthy male patients, ages 55 to 65 on average, who were entirely edentulous • group I: seven patients were given a mandibular overdenture that was held by two im plants and had telescopic attachments for a primary zirconiabased coping and a secondary PEKK-based coping against a maxillay full denture. • Group II: …

Correlation Of Mandibular Advancement Device For Management Of Obstructive Sleep Apnea And Body Mass Index And Oxygen Saturation. Clinical Prospective Study, Hala G. Elzayady, Noha H. El-Shaheed, Aida M. Yousef, Aisha Z. H. Mostafa

Mansoura Journal of Dentistry

Objective: Reduced oxygen saturation (SaO₂ %) is a clinical sign of obstructive sleep apnea (OSA), It is regarded as one of the medical problems. The study's goal was to investigate the connection between oxygen saturation, body mass index (BMI), and using the Mandibular Advancement Device (MAD) to manage people with obstructive sleep apnea.

Materials and Methods: From the outpatient clinic of the Sleep Medicine Unit, Chest Medicine Department, Faculty of Medicine, Mansoura University, twenty patients with obstructive sleep apnea were chosen. A mandibular advancement was utilized to treat obstructive sleep apnea. Using polysomnography, periodic oxygen saturation and body …

The Use Of Expanded Polytetrafluoroethylene Membrane (E-Ptfe) As A Barrier Membrane For Critical Size Defects Following Jaw Cyst Enucleation, Sara Salem, Ayman Ahmed Yaseen, Mohamed Abdel-Monem Tawfik

Mansoura Journal of Dentistry

Purpose: The use of bone graft following cyst enucleation could lead to infection so, this study was conducted to investigate impact of (e-PTFE) membrane alone without bone graft in promoting bone healing compared to the spontaneous bone regeneration after cyst enucleation.

Materials and methods: Sixteen intra-bony cysts in 16 patients (6 males, 10 females) were included. In study group (e-PTFE) barrier membrane was used alone after enucleation while, in control group the conventional technique was used. The follow up Period was 6 and 12 months postoperatively. Clinically, pain, soft tissue healing, and membrane exposure were assessed. Radiographically, CBCT scans were …

Effect Of Debonding Methods Of Metallic Orthodontic Bracket Bonded To Zirconia On Its Surface Topography, Dina A. Elbialy, Marwa M. Wahsh, Noha E, Sabet, Ghada A. Hussein

Mansoura Journal of Dentistry

Objectives: to evaluate the effect of debonding methods of metallic orthodontic bracket bonded to monolithic zirconia restoration on it’s surface topography. Materials and Methods: Twenty-eight zirconia ceramic restorations were prepared and air abraded. Then twenty-eight metal orthodontic brackets were bonded using MDP containing bond for group M and Non-MDP containing bond for group N. All bonded slices were aged by thermocycling for 5000 cycles. Debonding of the brackets were done by two methods subgroup (L) the brackets was debonded by LASER and subgroup (C) the brackets debonded by conventional bracket removal plier. Results: Regarding MDP-containing Bond: The mean surface roughness …

The Impact Of Birth Characteristics And Feeding Habits On The Eruption Of Primary Teeth: A Cross-Sectional Study, Mai Mounir Okda, Salwa Adel Hegazy, Rasha Ibrahim Ramadan

Mansoura Journal of Dentistry

Objective To evaluate the effect of birth characteristics e.g. (birth weight) and feeding habits e.g. (feeding type) on the eruption of primary teeth of new-born infants. Subjects and Methods A cross-sectional study was designed to collect data for this study by using an interviewer-administered closed-ended questionnaire on 500 mothers of healthy infants who were in age group within the first week of birth to 24 months. Oral examination of those infants was done to ascertain the condition of eruption of primary teeth in addition to teething signs and symptoms. Result The mean time of the eruption of first deciduous tooth …

Variations In Root Anatomy Of Mandibular Third Molars Using Cone Beam Computed Tomography And Personal Identification: A Cross-Sectional Study Amongst Egyptians, Shimaa M Motawei, Bassant Mowafey, Fatma Ata, Mohammad Osama, Osama A. Shabka

Mansoura Journal of Dentistry

Objective: To assess the root canal anatomy and root morphology of mandibular third molars (MTMs) in the Egyptians using cone beam computed tomography (CBCT). Methods: A total of 338 CBCT scans of mandibular third molars (MTMs) were collected and evaluated regarding the related root(s) number and root canal configuration. Statistical analysis highlighted differences between different categories and their prevalence among genders and sides (significance level was set at p < 0.05). Data were presented as frequency and percentage values and were analyzed using a chisquare test followed by pairwise comparisons utilizing multiple Fisher’s exact tests with Bonferroni correction. The significance level was set at p < 0.05 within all tests. Results: A total of 338 MTMs [186 (55%) from male patients, 152 (45%) from female patients] from 279 patients (151 male and 128 female) were evaluated. The majority (82.84%) of the studied MTMs had two roots. single-, triple-, and quadruple-rooted MTMs were less common than double-rooted MTMs, accounting for 10.1%, 5.33%, and 1.18% of the sample, respectively. Regarding root canal anatomy, Vertucci type I was the most seen morphology (61% of all MTMs roots mostly in distal roots (42.41%), followed by Vertucci type III (13.08%). The chi-square test showed no significant difference between males and females (p=0.36) or between the right side and left sides (p=0.691) regarding the number of roots. Conclusion: Within the limitations of the present study, the findings conclude significant variability in the root and root canal anatomy of mandibular third molars (MTMs) within the Egyptian sub-population.

Mechanical And Optical Behavior Of Two Lithium Silicate-Based Glass Ceramics After Aging In Intra-Oral Simulating Condition, Sherief Mowafy, Salwa Abdel Raouf Elnegoly, Hagag Abdelkader Mohammed

Mansoura Journal of Dentistry

Aim This study evaluated the mechanical and optical properties of Zirconia-reinforced lithium disilicate (ZLS) and lithium disilicate (LS) glass ceramics after immersion in artificial saliva solutions with varying pH. Methods A total of 104 samples were fabricated from Vita Suprinity (ZLS) and IPS E.max CAD (LS). Samples were divided into test and control groups, with the test group further divided into neutral (7.2), acidic (5.8), and basic (8.3) pH subgroups. Samples were immersed for 24 hours at 37°C and evaluated for microhardness, fracture toughness, and color stability. Results Significant differences were found in the properties of both materials across the …

Dual Suppression Of Glossina Pallidipes Using Entomopathogenic Fungal-Based Biopesticides And Sterile Insect Technique, Fidelis L.O. Ombura, Adly M.M. Abd-Alla, Komivi S. Akutse, Steven Runo, Paul O. Mireji, Rosemary Bateta, Joseck E. Otiwi, Inusa J. Ajene, Fathiya M. Khamis

All Peer-Reviewed Publications

Tsetse flies and trypanosomosis significantly impact bovine production and human health in sub-Saharan Africa, exacerbating underdevelopment, malnutrition, and poverty. Despite various control strategies, long-term success has been limited. This study evaluates the combined use of entomopathogenic fungi (EPF) and the sterile insect technique (SIT) to combat tsetse flies. Eleven EPF isolates were tested against teneral males of Glossina pallidipes, focusing on mortality rates, radial growth, and impacts on fly fitness. Temperature effects on conidial growth, sporulation, and spore yield of SIT-compatible/tolerant strains were also assessed. The fungal isolates significantly influenced mortality rates in both unirradiated and irradiated (SIT-treated) males (p <  0.0001). Metarhizium anisopliae strains ICIPE 20, ICIPE 32, ICIPE 41, ICIPE 62, ICIPE 78, and Beauveria bassiana ICIPE 603 showed higher SIT compatibility/tolerance with LT50 values of 11–30 days, compared to other more virulent isolates with LT50 values of 4–9 days. Temperature significantly affected the radial growth of SIT-compatible EPF strains (p <  0.0001), with M. anisopliae ICIPE 78 exhibiting the fastest conidia growth at 25°C. Spore yield varied significantly across temperatures (15–40°C), and the thermal range for conidia germination of SIT-compatible strains was 8.1–45.4°C, with an optimal range of 26.7–31.1°C. Moreover, infected unirradiated females and irradiated males (donors) successfully transmitted conidia to untreated flies (receivers) without significant differences in survival rates (p = 0.6438) and no observed sex dimorphism. Our findings highlight the potential of combining EPF and SIT as a novel dual approach that could effectively and synergistically suppress tsetse fly populations.

Characterisation Of ‘Giant’ Cysts Of The Potato Cyst Nematode, Globodera Rostochiensis, Present In Potato Fields In Kenya, James A. Price, Kelsey Hunt, Newton Nyagah, Calvince Orage, Onesmus Mwaura, Solveig Haukeland, Danny Coyne, John T. Jones

All Peer-Reviewed Publications

Potato production in East Africa is seriously impacted by the potato cyst nematode (PCN), Globodera rostochiensis, where it has been recorded in at least three countries. In Kenya, it is widespread in all major potato-growing regions, often at very high densities. Consecutive cropping of potato on the same land and a sub-tropical climate have influenced PCN biology. For example, unusually large cysts have been regularly recovered. We have analysed the biological properties of these ‘giant cysts’. The giant cysts contained more eggs than those recovered from UK fields. Egg size did not differ from UK populations and there was no …

Tissue-Specific Localization Of Tick-Borne Pathogens In Ticks Collected From Camels In Kenya: Insights Into Vector Competence, Rua Khogali, Armanda Bastos, Joel L. Bargul, Dennis Getange, James Kabii, Daniel Masiga, Jandouwe Villinger

All Peer-Reviewed Publications

Background: Tick-borne pathogen (TBP) surveillance studies often use whole-tick homogenates when inferring tick-pathogen associations. However, localized TBP infections within tick tissues (saliva, hemolymph, salivary glands, and midgut) can inform pathogen transmission mechanisms and are key to disentangling pathogen detection from vector competence. Methods: We screened 278 camel blood samples and 504 tick tissue samples derived from 126 camel ticks sampled in two Kenyan counties (Laikipia and Marsabit) for Anaplasma, Ehrlichia, Coxiella, Rickettsia, Theileria, and Babesia by PCR-HRM analysis. Results: Candidatus Anaplasma camelii infections were common in camels (91%), but absent in all samples from Rhipicephalus pulchellus, Amblyomma gemma, Hyalomma dromedarii, …

Bacteria Associated With Parthenium Hysterophorus Root Exudate Influence Olfactory Oviposition Responses Of Anopheles Gambiae, Trizah K. Milugo, Baldwyn Torto, David P. Tchouassi

All Peer-Reviewed Publications

Introduction: Previously, we documented that the malaria vector Anopheles gambiae responds to volatile emissions from the root exudate water of the invasive plant, Parthenium hysterophorus. However, the origin of the volatiles remains to be investigated. Here, we isolated bacteria from the root exudate water of the plant, test the influence of their volatiles in gravid An. gambiae oviposition, and examined relationships between volatile profiles and oviposition. Methods: Bacteria from root exudate water of P. hysterophorus were isolated using culture on Luria Bertani medium and identified by sequencing the 16S rRNA gene. Cultures of individual isolates were evaluated for egg laying …

Integrating Vegetables In Push-Pull Technology: Gendered Preferences Of Smallholder Farmers In Western Kenya, F. O. Ouya, J. O. Pittchar, F. Chidawanyika, Z. R. Khan

All Peer-Reviewed Publications

Transformative rural smallholder agriculture addressing biophysical constraints requires farmer-led innovations for increased technology adoption. Following the need to further intensify the cereal push-pull technology (PPT) for pest and weed control through integration with vegetables, we conducted surveys to determine suitable vegetables across three different counties in Kenya namely Homabay, Siaya, and Trans-Nzoia. Farming in these areas is predominantly maize based and introducing vegetables to the system will improve household food and nutritional security, together with income. A systematic random sampling method was used to sample a total of 124 smallholder farmers who were interviewed during field days where farmer awareness …

Ticks (Acari: Ixodidae) Infesting Cattle In Coastal Kenya Harbor A Diverse Array Of Tick-Borne Pathogens, Joseph Wang Ang A. Oundo, Shewit Kalayou, Quirine Ten Bosch, Jandouwe Villinger, Constantianus J.M. Koenraadt, Daniel Masiga

All Peer-Reviewed Publications

Ticks and the microbes they transmit have emerged in sub-Saharan Africa as a major threat to veterinary and public health. Although progress has been made in detecting and identifying tick-borne pathogens (TBPs) across vast agroecologies of Kenya, comprehensive information on tick species infesting cattle and their associated pathogens in coastal Kenya needs to be updated and expanded. Ticks infesting extensively grazed zebu cattle in 14 villages were sampled and identified based on morphology and molecular methods and tested for the presence of bacterial and protozoan TBPs using PCR with high-resolution melting analysis and gene sequencing. In total, 3,213 adult ticks …

Clinical Outcomes And Implant Stability Changes Associated With Immediately Loaded Implant Of Two Different Types Inserted In Posterior Maxilla, Hossam Mohammed Kamal, Mohamed Zaghloul Amer, Walid Abd El-Ghafar Al-Zordk, Noha Ahmed Mansour

Mansoura Journal of Dentistry

Objectives: To evaluate the implant stability changes associated with immediately loaded implants with specific knife-edge threads versus implants with conventional threads inserted in the posterior maxilla.

Materials and methods: Twenty patients were selected for prosthetic replacement of missed maxillary posterior single tooth by a dental implant. Patients of this study were selected after approval of the Research Ethics Committee with code (A15030821). All patients were divided into two equal groups: Group 1 (Control group): Ten patients received 10 implants of conventional thread design. Group 2 (Study group): Ten patients receiving 10 implants with specific wide knife-edge thread design. Clinical evaluation …

Fixed Detachable Prosthesis Versus Implant-Supported Overdenture For Rehabilitation Of Edentulous Maxilla Opposing 2-Implant Mandibular Overdenture: A Cross-Over Study Of Chewing Efficiency And Maximum Bite Force, Fatma Mahanna

Mansoura Journal of Dentistry

Objective: This study assessed the chewing efficiency and maximum bite force of maxillary implant-supported bar overdentures, and fixed hybrid prostheses opposed by a mandibular overdenture supported by 2 implants. Materials and methods: Six completely edentulous patients enrolled from a previous study installed with a mandibular overdenture comprising two implants. Four parallel maxillary implants were placed in the canines and second premolars region. Each patient randomly received a bar overdenture (BOD) and a fixed hybrid prosthesis (FHP). Using chewing gum and View Gum software, the chewing efficiency was assessed in terms of variance of hue (VOH). Using an occlusal force meter, …

Conventional Vs Compressive Implants For Supporting Immediate Loading Bar-Retained Mandibular Overdenture: A Study Of Peri-Implant Tissue Health And Implant Stability, Mohammed H. Karkash, Khaled M. Zahran, Islam H. Kandil, Ahmad A. Habib

Mansoura Journal of Dentistry

Objective: This study was aimed to compare two implant design concepts used to assist immediately loaded mandibular complete overdenture as regards to the implant stability and peri-implant soft tissue health.

Materials and Methods: Forty-four healthy fully edentate patients were chosen. Patients received conventional complete dentures and randomly divided into; Group I: with four conventional implants. Group II: with four compressive implants. For all patients, implants installed in the inter-foramina areas and were immediately loaded with mandibular complete overdenture containing metal framework housing three clips and retained by implant screwed titanium bar. Implant stability was measured by Periotest^® and the …

Investor-State Climate Litigation: Could International Investment Law Help To Protect The Climate?, Dr. Andreas Buser

Indian Journal of International Economic Law

Climate Protection and International Investment Law have an ambiguous relationship. Whereas some scholars highlight that investment Law could help in protecting green investments many commentators depict investment protection as an obstacle to States’ climate mitigation policies. This article seeks to go beyond that limited dichotomy in assessing whether investment law could be a tool for investors to argue for more, rather than less climate protection. In particular, full protection and security clauses may well be interpreted to contain due diligence obligations to protect climate sensitive investments against effects of climate change. Moreover, if States postpone climate protection to a time, …

Wto Law And Environmental Processes And Production Methods (Ppms): A Deconstruction, Irene Musselli

Indian Journal of International Economic Law

In principle, WTO members can adopt PPM measures to protect the environment, provided certain conditions are met to prevent the misuse of these measures for protectionist purposes. In practice, the judicial review of such measures in the WTO context is punctuated by practical difficulties, and is fraught with intractable uncertainty: most PPM regulations that were challenged passed on principle but failed on specific details related to the dispute at hand. This article aims to contribute to the PPM discussion by providing critical and deconstructive perspectives on trade law. It argues that the challenges in assessing WTO compliance of PPMs stem …

Evaluation Of Soft And Hard Tissue Changes Around Guided Immediate Implants In The Esthetic Area With Immediate Temporization: A Prospective Clinical And Radiological Pilot Study, Pierre Lahoud, Elie Bou Assi, Abdallah Menhall, Lara Nasr, Christian Makary

International Arab Journal of Dentistry

Objectives: This study aimed to assess soft and hard tissue changes occurring 6 and 12 months after guided implant placement into extraction sockets and immediate temporization in the esthetic zone.

Methods: Eight patients requiring single immediate implant placement in the anterior mandible or maxilla were included in this study. A traumatic extractions were performed using ultrasonic instruments and implants were placed into extraction sockets following digitally guided surgery. Gap between implants and buccal bone plate was filled with allogeneic bone substitutes. Implants were immediately temporized with pre-prepared PMMA crowns. Cone Beam Computed Tomography and digital impressions were done …

Comparison Of The Failure Between Conventional Pmma And Milled Pmma Full Arch Maxillary Interim Prosthesis Fixed On 4 Implants: An In Vitro Study, Tatiana Bou Sakr, Hani Tohme, Natalia Bou Sakr, Victor Ghoubril, Carole Abi Ghosn Yared

International Arab Journal of Dentistry

Objectives: The principal objective of this study was to compare the failure load between the conventional heat polymerized PMMA and the CAD/CAM milled PMMA interim full arch implant prostheses. The secondary aim was to evaluate the success of the distal extension of the temporary PMMA prosthesis.

Methods: A metallic edentulous upper arch model with 4 Straumann screw-retained abutment digital analogs was used to create 15 specimens for each of the 2 groups: Conventional and milled. Failure load was measured on 5 different regions on the left and right side of each specimen with the YLE universal testing machine: …

Investigation Of Fracture Resistance With Different Diameters Of Polyetherketoneketone Post And Core Materials: A Pilot Study, Maya Kabbara, Ryan Harouny, Habib Rahme

International Arab Journal of Dentistry

Objectives: The primary objective of this study is to investigate the resistance to fracture of Polyetherketoneketones PEKK, used as post and core by fabrication in different diameters in the canal, and comparing the test results for each group.

Methods: Thirty extracted mandibular premolars were selected, endodontically treated and prepared to receive the post and cores milled from polyetherketoneketone disk. The specimens were randomly divided into five groups (n = 6) respectively: group 1 received pekk post with diameter = 0.70 mm, group 2 received pekk post with diameter = 0.90 mm, group 3 received pekk post with diameter …

Does Reduced Taper Canal Preparation Increase The Load Capacity Of Endodontically Treated Teeth?, Mostafa M.A. Elkholy, Omar Mahmoud Noureldin, Hala Fayek Khalil, Shehabeldin M. Saber

International Arab Journal of Dentistry

Objectives: The aim of this in-vitro study is to assess and compare the load capacity of teeth with canals prepared using progressive taper versus regressive taper.

Methods: Twenty-seven extracted mandibular molars were categorized into three equal groups. The negative control group involved teeth that were accessed and restored with composite resin without canal preparation. The regressive canal preparation group used the TruNatomy file system, while the progressive canal preparation group employed the ProTaper Gold system. Subsequently, all samples underwent loading using a universal testing machine until tooth fracture occurred. The force required to fracture each tooth was recorded …

Digital Assessment Of Soft And Hard Tissue Alterations After Anterior Maxillary Tooth Extraction, Robin Jalkh, Stephanie Mrad, Emile Chrabieh, Joe Bassil

International Arab Journal of Dentistry

Objectives: This study aimed to assess dimensional alterations in soft and hard tissues 12 weeks post-extraction using novel computerized methods. Secondary objectives included exploring potential correlations between soft tissue changes and underlying bone variations, as well as investigating relationships between soft and hard tissue alterations and various contributing factors.

Methods: For all patients, preoperative and postoperative CBCT scans and intra-oral scans were obtained. Soft and hard tissue dimensions before extraction and at 12 weeks post-extraction were measured using 3D-slicer software. Both DICOM and STL files were superimposed, and measurements were taken at 2mm and 4mm from the facial …

Evaluation Of Fracture Resistance Of Composite Resin And Glass Ionomer In Beveled Versus Non-Beveled Class Ii Restorations In Primary Molars: An In Vitro Comparative Study, Suzanne Abou Aziz, Cynthia Kassis, Ryan Harouny, Lara Nasr, Georges El Najjar, Marlene Khoury

International Arab Journal of Dentistry

Introduction: The high viscosity Bulk-Fill composite (Tetric N ceram) and high viscosity glass ionomer cement (Equia Forte GIC) are the most used materials in class II cavities of primary molars. They have the advantages of being placed in a single layer of 4mm and therefore allow better ergonomics and speed of use. Until now, we find failures of restorations at the level of class II cavities of temporary teeth and many authors have tested the role of the bevel in improving the mechanical strength of restorations.

Objectives: The objectives of this study are: to test the role of …

Assessment And Quantification Of The Microbial Flora In The Output Water Of Two Types Of Dental Chairs: A Comparative Study, Khalil Kharma, Louis Hardan, Cynthia Kassis, Rim Bourgi, Regina Geitani, May Mallah, Elie Maalouf, Carina Mehanna Zogheib

International Arab Journal of Dentistry

Objectives: Dental Unit Waterlines (DUWL) have shown to be a perfect host for different pathogenic microorganisms. The purpose of this study was to analyze and compare the level of bacterial contamination in the output water of 2 types of DUWL.

Methods: Dental unit water samples from the air/water syringe of the A-dec (A-dec™ Performer 200, Newberg, USA) DUWL type and KaVo (ESTETICA™ E30/E70/E80 Vision, Kavo, Biberach, Germany) type were collected and analyzed for total aerobic flora, Pseudomonas aeruginosa, faecal coliforms, total coliforms, faecal streptococci and sulfite-reducing anaerobic flora.

Results: The bacteriological analysis of water samples shows the …

Clinical Assessment Of The Abutment Teeth Of Children Undergoing Space Maintainer Therapy: A Randomised Controlled Trial, Ayesha Fathima, Ganesh Jeevanandan, Prabhadevi Maganur, Suman Panda, Ather Syed Ahmed, Satish Vishwanathaiah

International Arab Journal of Dentistry

Introduction: The band and loop space maintainer are one of the most commonly used fixed space maintainers in children. However, prolonged use of appliances in the oral cavity may lead to changes in gingival health and an increased risk of caries.

Objectives: This study aims to evaluate the clinical parameters of the abutment teeth, specifically the banded teeth and the tooth to which the loop is extended.

Methods: This prospective clinical study included 35 children between the age group of 5 to 9 years. The children were examined at baseline and 6-month follow-up. The abutment teeth were …

Comparative Evaluation Of Surface Changes And Bond Strength Of Microabrasion-Bleached Enamel Before And After Remineralization With Nano-Hydroxyapatite Paste: An In Vitro Study, Ridhi Dube, Anita Sanap Tandale, Twinkle Kishore Talreja, Karishma Krishnakumar, Prajakta Kokate, Vaishnavi Jemini Kasat

International Arab Journal of Dentistry

Objectives: Comparative evaluation of surface changes and bond strength of Microabrasion Bleached enamel before and after Remineralization with Nano-hydroxyapatite paste, an In vitro study.

Methods: Enamel samples were divided into - Group I - Conventional bleaching (HB), Group II - Conventional bleaching with remineralization (HB+N-Hp), Group III - Microabrasion-assisted bleaching(M+HB), and Group IV - Microabrasion-assisted bleaching with remineralization(M+HB+NHp). Surface roughness was measured using a profilometer. Samples were stored in artificial saliva for two weeks, then bonded with nanofilled composite resin and subjected to shear bond strength (SBS) analysis.

Results: Group IV (M+HB+N-Hp) showed higher surface roughness than …

A Comparison Between The Flexural Strength Of Milled, Conventional, And Carbon Fiber Pmma For Interim Implant-Supported Fixed Complete Dentures: An In Vitro Study, Jenny Abou Nader, Paul Boulos, Jihad Fakhouri, Nancy Chemaly, Carol Abi Ghosn

International Arab Journal of Dentistry

Objectives: to investigate the flexural strength of three materials commonly used for interim implant-supported fixed complete dentures (ISFCDs): conventional heat cure PMMA, CAD/CAM milled PMMA, and carbon fiber-reinforced PMMA.

Methods: Sixty specimens (n=60) divided equally into three groups (heat cure, milled, carbon fiber) were prepared. Samples were inspected to ensure absence of voids or irregularities and when required, minor adjustments were made to adjust the dimensions. The samples underwent thermocycling (5-55°C for 2500 cycles) and were then tested using a three-point bend test.

Results: There was a statistically significant difference between heat cure PMMA and carbon fiber …

Aesthetic Rehabilitation Of A Complex Crown-Root Fracture By Fragment Reattachment With A Fiber-Reinforced Post: A Case Report, Sarra Saidi, Meriem Fejjeri, Mahdi Tlili, Sabra Jaafoura, Nadia Frih

International Arab Journal of Dentistry

Complex crown-root fractures are characterized by the involvement of both crown and root with pulp exposure. They pose aesthetic, functional, and psychological problems for the patient. Furthermore, they can pose technical difficulties for the practitioner. The purpose of this case report is to describe the management of a complex crown-root fracture of the right upper central incisor with subgingival limit by reattaching the tooth fragment with fiber-reinforced post. We considered a coronal elongation (gingivectomy and osteoplasty) to recreate the biological space and to expose the limit of the fracture line to guarantee the quality of the bond.