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- Bioceramics (4)
- Biomaterials (4)
- Dentistry (4)
- Zirconia (4)
- Alumina (3)
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- Alumina-Composite (3)
- Functionally Graded Concept (3)
- Hydroxyapatite (3)
- Metal-ceramic functionally graded materials (3)
- Titanium (3)
- Dental post (2)
- GUTTA-PERCHA (2)
- ROOT CANAL SYSTEM; RESILON (2)
- Yemen (2)
- Alumina-zirconia nanocomposites (1)
- CAD/CAM (1)
- Crowding (1)
- Dental Anxiety (1)
- Dental Arch Dimensions (1)
- Dental Education (1)
- Dental Fear (1)
- Dental Health (1)
- Dentistry; endodontic repair filling materials; calcium hydroxide; mineral trioxide aggregate; biodentine; EndoSequence; BioAggregate. (1)
- Evaluation of the occlusion and maxillary dental arch dimensions in the mixed dentitions of Yemeni population (1)
- FUNCTIONALLY GRADED DESIGN; MULTI LAYERED POST; FUNCTIONALLY GRADED DENTAL POST; DENTAL MATERIALS; ENDODONTICS; LOADING (1)
- FUNCTIONALLY GRADED DESIGN; MULTI LAYERED POST; FUNCTIONALLY GRADED DENTAL POST; Finite Element; Multilayered Structured (1)
- Functionally graded concept (1)
- Functionally graded design (1)
- Functionally graded materials (1)
- Heterogeneous structure (1)
Articles 1 - 14 of 14
Full-Text Articles in Medicine and Health Sciences
Evaluation Of The Occlusion And Maxillary Dental Arch Dimensions In The Mixed Dentitions Of Yemeni Population, Ahmed A. Madfa
Evaluation Of The Occlusion And Maxillary Dental Arch Dimensions In The Mixed Dentitions Of Yemeni Population, Ahmed A. Madfa
Ahmed A. Madfa
Determination the dental arch dimensions in human populations is necessary for various fields of dental sciences. This study was designed to evaluate the maxillary dental arch dimensions of Yemeni children aged (10-12) years. The sample was gathered from primary and intermediate school in Sana'a city, Yemen. Clinical examination was performed on 200 subjects (100 males and 100 females) that fulfillment the criteria of this study. The examination was carried out for subjects that have either normal occlusion or class I with anterior dental crowding. Pairs of studying models for the dental arch was constructed and evaluated by special software for …
Prevalence Of Dental Anxiety And Fear Among Medical Students At University Of Thamar, Ahmed A. Madfa
Prevalence Of Dental Anxiety And Fear Among Medical Students At University Of Thamar, Ahmed A. Madfa
Ahmed A. Madfa
Background/purpose: Fear from dental treatment is widespread distressing problem for the dentist. Anxiety may have an impact to the dentist-patient relationship and it may cause to misdiagnosis. Therefore, this study aimed to assess the levels of dental anxiety and fear among medical students at University of Thamar.Materials and methods: Dental anxiety scale (DAS) and Dental Fear Survey (DFS) were completed by one hundred undergraduate medical students. Cross-tabulations were applied to determine the levels of DAS and DFS. Pearson’s correlation was used to analyse the association among the dental anxiety measurements. Pearson’s correlation also was used to investigate the association between …
Endodontic Repair Filling Materials: A Review Article., Ahmed A. Madfa
Endodontic Repair Filling Materials: A Review Article., Ahmed A. Madfa
Ahmed A. Madfa
The emergence of Mineral Trioxide Aggregate (MTA) as endodontic repair filling material has generated a lot of interest due to its superior sealing ability and biocompatibility. Although MTA possesses superior sealing ability to traditional endodontic repair filling materials, such as calcium hydroxide, but it has poor handling characteristics. A novel endodontic repair filling materials with similar chemical composition, but improved handling characteristics, was recently developed. Recently, BioAggregate repair filling materials is claimed as biocompatible material and promotes cementogenesis and forms a hermetic seal inside the root canal. More recently, Biodentine and EndoSequence endodontic repair materials introduced to the market. Both …
Use Of Zirconia In Dentistry: An Overview., Ahmed A. Madfa
Use Of Zirconia In Dentistry: An Overview., Ahmed A. Madfa
Ahmed A. Madfa
Due to an increasing interest in esthetics and concerns about toxic and allergic reactions to certain alloys, zirconia was proposed as a new ceramic material in the later part of 20th century. It has become a popular alternative to alumina as biomaterial and is being used in dental applications for fabricating endodontic posts, crown and bridge restorations and implant abutments. It has also been applied for the fabrication of esthetic orthodontic brackets. This article presents a brief history, dental applications and new methods for fabrication of zirconia improving its mechanical properties. Additionally, the bonding between zirconia and resin cements as …
Advantage Of Combined Amalgam-Composite Restoration: In Vitro Leakage Study, Ahmed A. Madfa
Advantage Of Combined Amalgam-Composite Restoration: In Vitro Leakage Study, Ahmed A. Madfa
Ahmed A. Madfa
Purpose: Evalute the leakage of Class II box composite restorations and compared with composite lined by flowable composite and combined amalgam-composite restoration. Method: Fifty-four Class II box shaped cavities were on the distal (1 mm below CEJ) surfaces, 18 cavities for each. Scotchbond Multi-Purpose adhesive system, Filtek Z250 composite, and a metal band system were used for all. After thermocycling test (1000 cycles, 5–55°C with 30 s) and dye immersion, the teeth were sectioned longitudinally in a mesio-distal direction and dye penetration was recorded. Results: Combine amalgam-composite restorations showed less gingival leakage than composite alone and composite lined by flowable …
Application Of Calcium Phosphate Materials In Dentistry, Ahmed A. Madfa
Application Of Calcium Phosphate Materials In Dentistry, Ahmed A. Madfa
Ahmed A. Madfa
Calcium phosphate materials are similar to bone in composition and in having bioactive and osteoconductive properties. Calcium phosphate materials in different forms, as cements, composites, and coatings, are used in many medical and dental applications. This paper reviews the applications of these materials in dentistry. It presents a brief history, dental applications, and methods for improving their mechanical properties. Notable research is highlighted regarding (1) application of calcium phosphate into various fields in dentistry; (2) improving mechanical properties of calcium phosphate; (3) biomimetic process and functionally graded materials. This paper deals with most common types of the calcium phosphate materials …
Fracture Resistance Of Endodontically Teeth Restored With Functionally Graded Posts, Ahmed A. Madfa
Fracture Resistance Of Endodontically Teeth Restored With Functionally Graded Posts, Ahmed A. Madfa
Ahmed A. Madfa
Objectives: To evaluate the fracture resistance and failure mode of endodontically teeth restored with functionally graded structured (FGS) posts compared to titanium and cast posts. Methods: Single canals in 70 bovine incisors were instrumented, irrigated, obturated and divided into seven groups. They were then root restored with titanium, cast and 3 experimental FGS posts of different compositions; ZrO2-Ti-HA, Al2O3-Ti-HA and Ti-HA. Two control groups were also included; sound teeth and those root treated only. All posts were cemented with zinc phosphate cement and built up with composite core. Crowns margins of 1 mm chamfer finishing line were prepared to receive …
3d-Fe Analysis Of Functionally Graded Structured Dental Posts, Ahmed A. Madfa
3d-Fe Analysis Of Functionally Graded Structured Dental Posts, Ahmed A. Madfa
Ahmed A. Madfa
This study aimed to compare the biomechanical behaviour of functionally graded structured posts (FGSPs) and homogenous-type posts in simulated models of a maxillary central incisor. Two models of FGSPs consisting of a multilayer xTi-yHA composite design, where zirconia and alumina was added as the first layer for models A and B respectively were compared to homogenous zirconia post (model C) and a titanium post (model D). The amount of Ti and HA in the FGSP models was varied in gradations. 3D-FEA was performed on all models and stress distributions were investigated along the dental post. In addition, interface stresses between …
A New Multilayer Composite With Functionally Graded Design For Endodontic Application., Ahmed A. Madfa
A New Multilayer Composite With Functionally Graded Design For Endodontic Application., Ahmed A. Madfa
Ahmed A. Madfa
Multilayer composite with FG structure were fabricated using zirconia (ZrO), alumina (AI2O3), Hydroxyapatite (HA) and titanium (Ti) micropowders. Powder selection and their combination in each layer were according to the results of finite element analysis.
Microstructural Characteristics Of Functionally Graded Materials Designed As Dental Post, Ahmed A. Madfa
Microstructural Characteristics Of Functionally Graded Materials Designed As Dental Post, Ahmed A. Madfa
Ahmed A. Madfa
To study the interfaces and microstructure of multilayered materials fabricated based on functionally graded concept for use as dental posts.
New Generation Of The Dental Posts For Endodontic Application., Ahmed A. Madfa
New Generation Of The Dental Posts For Endodontic Application., Ahmed A. Madfa
Ahmed A. Madfa
Fabricated multilayer dental post with the functionally graded design is a novel product that exhibits graded properties varied from coronal to apical parts of the tooth. The new dental post definitely performs better than posts available in the market and improves the quality of human life
A Finite Element Study Of The Multilayered Structured Dental Post, Ahmed A. Madfa
A Finite Element Study Of The Multilayered Structured Dental Post, Ahmed A. Madfa
Ahmed A. Madfa
Ideally, dental post should have stiffness that is similar to the crown at the coronal part and stiffness similar to the dentine at the apical part. This will reduce stress concentration at either coronal or the apical parts of the dentine and minimize the chance of interfacial loosening and enhance the reliability of post. Objective: To investigate the biomechanical behaviour of Multilayered Structured Dental Posts (MSDPs) using finite element analysis (FEA). Methods: Two models of MSDPs consist of multilayer design of xTi-yHA composition added to a zirconia layer (model A) and the same compositions added to alumina layer (model B) …
Evaluation Of Obturation Quality In Round And Irregular Root Canals, Ahmed A. Madfa
Evaluation Of Obturation Quality In Round And Irregular Root Canals, Ahmed A. Madfa
Ahmed A. Madfa
Objective: This study compared the quality of root canal obturation in round and irregular-shaped canals at two cross-sectional levels by evaluating the canal area filled by two core materials using two obturation techniques. Methods: Single canals in 60 mandibular premolars were instrumented, irrigated and divided into four equal groups. They were root filled as follows: lateral compaction/RealSeal™ (LC/R), lateral compaction/gutta-percha (LC/GP), warm vertical compaction/RealSeal™ (WC/R) and warm vertical compaction/gutta-percha (WC/GP). The teeth were sectioned horizontally at 3 mm (L3) and 6 mm (L6) intervals from the obturated canal terminus. Shapes of canals in all cross-sections were examined using a Leica …
Warm Vertical Compaction Versus Lateral Compaction For Root Canal Obturation, Ahmed A. Madfa
Warm Vertical Compaction Versus Lateral Compaction For Root Canal Obturation, Ahmed A. Madfa
Ahmed A. Madfa
Objectives: This study compared warm vertical compaction with lateral compaction for obturating root canals with either a polymer-based resin system or gutta-percha. Quality of obturation was evaluated by (i) analysis of the canal area occupied by filling core materials, sealers and voids at three cross-sectional levels and (ii) SEM examination. Methods: Single canals in 64 mandibular premolars were instrumented, irrigated and divided into four equal groups. They were root filled as follows: lateral compaction/resin (RealSeal™, SybronEndo) (LC/R), lateral compaction/gutta-percha with AH Plus™ (LC/GP), warm compaction/resin (WC/R) and warm compaction/gutta-percha (WC/GP). One specimen from each group, randomly chosen for SEM examination, …