Basic Informations

C.V

Mazen Ahmed Mahmoud Attia

65 Horreya Street, Cairo, Egypt.

Tel: +2 (22400455) Mob: +2 (01002584040)

E-mail: drmazen@hotmail.com

Key Qualifications

Strong communication, presentation and management skills.

Hard worker demonstrate good reasoning abilities and management of pressing situations.

Up to date with the latest developments in dentistry.

EDUCATION :

• Doctor Degree (Ph.D. Fixed Prosthodontics), Faculty of Dental Medicine, Al-Azhar University, 2013.
• Master Degree (M.Sc. Fixed Prosthodontics), Faculty of Dental Medicine, Al-Azhar University, 2010.
• Bachelor Degree (BDS) Faculty of Oral and Dental Medicine, Cairo University, 1994.
• General Certificate of Education G.C.E., Oxford University, 1988.

PROFEESIONAL EXPERIENCE :

January 2016-till present:

• Lecturer of Fixed Prosthodontics, Beni-Suef University.
• Lecturer of Fixed Prosthodontics, Assiut University.
• Head of Continuous Education Unit, Beni-Suef University.

September 2014-January 2016:

• Lecturer of Fixed Prosthodontics Modern University for Technology and Information (MTI).

January 2014-June 2014:

• Lecturer of Fixed Prosthodontics Misr International University (MIU).

January 2001-present:

• Self-owned private practice.
• Working in private hospitals: (Al-Rahma hospital, Al-Afghani hospital).
• Self-owned private dental ceramic laboratory.

October 1996-January 2001:

• Officer at Specialized Dental hospital (Military forces).

December 1995-October1996:

• Kasr Al-Einy Dental hospital, Cairo University.

PUBLICATIONS:

• A Twofold Comparison between Dual Cure Resin Modified Cement and Glass Ionomer Cement for Orthodontic Band Cementation. Open Access Macedonian Journal of Medical Sciences; Vol 4, No 4 (2016): Dec 15 (OAMJMS).
• Flexural strength of small connector designs of zirconia-based partial fixed dental prostheses. J Prosthet Dent. 2016 Feb; 115(2):224-9.
• Effect of metal selection and porcelain firing on the marginal accuracy of titanium-based metal ceramic restorations. Journal of Prosthetic Dentistry, January 2010 (Vol.103, Issue 1, Pages 45-52).
• The effect of different surface treatments on the flexure bond strength of titanium-ceramic interface. Al-Azhar Journal of Dental Science. April 2009 (Vol.12, Issue2, Pages 137-147).
• Mazen A.Attia, Poster presenter and principle investigator in the IADR/AADR/CADR General Session (March 11-14, 2015) Boston, Massachusetts, USA. Title of the poster: “Flexural Strength of Zirconia-Based Fixed Dental Prostheses with Different Connector Designs”.
• Mazen A.Attia, Speaker in the EDSIC 2017 Title of the lecture: Zirconia: What You Really Want To Know.
• Mazen A.Attia, Speaker in many conferences Title of the lecture: Zirconia ceramics Chance or Risk.

Master’s thesis:

Evaluation of the marginal accuracy and bond strength of two forms of titanium-ceramic restorations.

 

Doctor Degree thesis:

Effect of different connector designs on the flexural strength of zirconia-based ceramic restorations.

CONTINUING EDUCATION :

• 29 Sep-1 Oct, 2004, The 3rd international conference of the Egyptian Association of oral and maxillofacial surgeons, Cairo, Egypt.
• 22-24 April 2005, The 2nd Arab African International Dental Congress, Cairo, Egypt. (40 credit hours)
• 5-7 Sep 2006, Advanced techniques in oral implantology, hard and soft tissue management. Boston University, USA. (21 credit hours)
• June 2006, Protaper, Nickel titanium rotary system and the thermafil, the single cone, 3D obturation system. DENTSPLY, UKX, , Cairo, Egypt
• December 2006, Theoretical and practical knowledge in the basic metal-ceramics. DENTSPLY, UKX, Cairo, Egypt. (5 credit hours)
• March 2007, Advanced courses in porcelain buildup, Vita, Germany.
• August 2007, Advanced Restorative Course “Achieving successful and durable esthetic results with direct composite resin restorations”. DENTSPLY, UKX, Cairo, Egypt. (5 credit hours)
• April 2008, Advanced anterior and posterior aesthetic restorations. DENTSPLY, UKX, Cairo, Egypt. (5 credit hours)
• May 2009, Master models (Functional model fabrication/waxing up (crown and bridge work) Renfert GmbH, Cairo, Egypt.
• December 2010, CZR Press-on technique on metal and zirconia frameworks, CAD\CAM construction technique. Noritake Co. Nagoya, Japan.
• 26-29 April 2011, Precision attachments techniques and recent trends for zirconia-ceramics. Bredent, Synden, Germany. (30 credit hours)
• 7-12 July 2011, Phantom Master’s Course for implant surgery training. IFZI, Mauthalle, Nurnberg, Germany. (49 credit hours)

RESEARCH INTERESTS:

• Implants.
• Dental ceramics.
• Dental technology & CAD/CAM.

MEMBERSHIPS:

• Member of the international congress of oral implantologists (ICOI).
• Member of the Egyptian Society of Oral Rehabilitation (ESOR).

LICENSURE:

• Arab Republic Egypt, Ministry of Health #15678.

SPECIAL SKILLS:

Language

• Perfect command of spoken and written Arabic and English.
• Basic knowledge of spoken French.

Computer

• MS Office: Word, Excel, PowerPoint.
• Internet surfing.

Personal

• Hardworking, highly organized.
• Leadership (currently responsible for a team of ten people).

Activities and Interests:

• Sports.
• Reading.
• Travelling.

PERSONAL DATA:

• Nationality: Egyptian.
• Date of Birth: November 15th, 1972.
• Married

Master Title

Evaluation of the marginal accuracy and bond strength of two forms of titanium-ceramic restorations

Master Abstract

Summary The first part of the present study was designed to evaluate the marginal accuracy of two forms of titanium-ceramic restorations. A stainless steel master die with a uniform finish line design (1.2 mm heavy chamfer) was machinery milled. A one stage impression was taken for the original prepared die with polyether using a custom made impression tray. From this duplication process, twenty working dies were fabricated in type IV stone for master die fabrication. A total of twenty copings were constructed according to material type and construction technique, and then divided into four groups of five copings each: Group I: (CP Ti) Grade II (Milling), Group II: (CP Ti) Grade I (Casting), Group III: Ti-6Al-7Nb alloy (Casting), Group IV: Ni-Cr alloy (Casting). A device was designed to apply a uniform static load on the metal copings to ensure accurate seating of the copings on their respective stainless steel master die during measurements. For all groups, the copings were repositioned on the original master die and axially loaded to avoid uncontrolled displacement or seating error by application of finger pressure. Marginal accuracy measurements (in micrometers) were recorded at eight predetermined reference points representing the (mesiolabial, distolabial, mesiolingual, distolingual, mid-buccal, mid-lingual, mid-distal, and mid-mesial) aspects of the die. The vertical marginal discrepancies between the margin of the copings and the external line angel of the heavy chamfer of the stainless steel die were measured at (X40) magnification with a stereomicroscope connected to a computer and a digital camera. The vertical marginal discrepancies for each coping were measured during three stages of coping fabrication: (1) before porcelain application, (2) after opaque application, and (3) after body porcelain application. A total of 480 measurements were recorded, (160) for each stage. The mean of the eight site measurements was obtained for each coping and considered to be the gap measurement. The data of the vertical marginal discrepancies were collected, tabulated and statistically analyzed using one-way (ANOVA) test followed by Student Newman-Keuls multiple comparison (SNK) tests to evaluate the significance between groups including control group. The second part of the present study was designed to evaluate the bond strength between two forms of titanium-ceramic restorations using two different surface treatments. A total of forty machined titanium specimens with (25.0 × 3.0 × 0.5 mm3) dimensions were prepared. In addition, ten specimens were cast from Ni-Cr alloy as the control group. The titanium specimens were equally divided into two main groups: (CP Ti) Grade II and Ti-6Al-4V alloy. Each group of the produced metal specimens for titanium and titanium alloy was divided into two equal subgroups of ten specimens each to receive different surface treatments: (a) 110 µm airborne-particle abrasion, (b) 10% by wt. aqueous solution of hydrochloric acid. Each subgroup was further divided into two divisions of five specimens each to be submitted to thermal cycling which consisted of 3000 cycles from 4°C (±2°C) to 55°C (±2°C) in water. Low-fusing porcelain was fired onto the central portion of the titanium specimens with (8.0 x3.0x1.0 mm3) dimensions in a dental porcelain furnace. For the control group, ten specimens were combined with the conventional porcelain. All groups were subjected to a 3-point bending test in a universal testing machine. Scanning electron microscope (SEM) photomicrographs were taken to characterize the failed surfaces at the titanium-ceramic interfaces. The bond failure data (in MPa) were collected, tabulated and statistically analyzed using two-way analysis of variance (ANOVA) test followed by Student Newman-Keuls multiple comparison (SNK) tests to examine the main effects of surface treatments and thermal cycling and the interactions between these two factors. Conclusions Within the limitations of the present investigation, the following conclusions were drawn: 1. Titanium copings fabricated by the CAD\CAM Everest system demonstrated the best marginal accuracy, when compared with the cast Ti-6Al-7Nb alloy and commercially pure titanium (CP Ti) copings. 2. Cast copings of Ti-6Al-7Nb alloy demonstrated better marginal accuracy than those of commercially pure titanium (CP Ti); however, both castings were clinically acceptable. 3. The marginal accuracy of the milled and cast titanium copings, both before and after porcelain application was within the range of clinical acceptability. 4. The marginal accuracy of the non-precious metal alloy (Ni-Cr) copings was inferior to the titanium copings. 5. The largest marginal discrepancies occurred during the opaque firing cycle. 6. The bond strength of the titanium/low-fusing porcelain system was comparable to that of the Ni-Cr/conventional porcelain system. 7. Surface treatment using airborne-particle abrasion or hydrochloric acid enhanced the titanium-ceramic bond; however, both exceeded the range of clinical acceptability. 8. Thermal cycling to simulate an oral environment did not affect the bond strength of titanium-ceramic system.

PHD Title

Effect of different connector designs on the flexural strength of zirconia-based ceramic restorations

PHD Abstract

Summary The first part of this in-vitro study was designed to determine the effect of different connector designs on the flexural strength of zirconia bars. A total of twenty ceramic bar-shaped specimens (4mm x4mm x30mm) were produced to simulate a 3-unit fixed partial denture (FPD) using a CAD/CAM machine and divided into four groups of five specimens each with four connector designs. In addition, five un-notched bar-shaped specimens served as control. Two connector designs, sharp (0.1±0.001 mm radius of curvature, and round (0.60±0.001 mm radius of curvature), were created. Connector designs were as follows: (I): (2mm H x 3mm W; round), (II): (2mm H x 3mm W; sharp), (III): (3mm H x 3mm W; round), (IV): (3mm H x 3mm W; sharp). The produced specimens were measured and verified by a digital caliper with an accuracy of 0.01 mm. The specimens were subjected to a 3-point flexural strength test in a universal testing machine with a cross head speed of 0.5mm\min until failure. Scanning electron microscope (SEM) was used to examine the fracture surfaces. Two-way (ANOVA) and the Tukey’s post-hoc test were used to analyze the data (a=.05). Mean (SD) failure loads were 891.8 (57.9) MPa for the control group, 682.9 (36.8) MPa for the 3mm x 3mm round group, 583.6 (49.7) MPa for the 2mm x 3mm round group, 502.8 (23.3) MPa for the 3mm x 3mm sharp group, and 486.7 (35.6) MPa for the 2mm x 3mm sharp group. The two-way (ANOVA) results revealed that connector diameter, shape and the interaction between the two variables had a statistically significant effect (P = 0.05) on the mean flexural strength. Within the limitations of this in-vitro study, a round connector design is preferred to improve the flexural strength of zirconia specimens. The second part of the study was designed to evaluate the fracture resistance of zirconia-based ceramic (FPDs) after dynamic loading. Two stainless steel master dies were designed to simulate a prepared second lower molar and a second lower premolar to receive all-ceramic bridges according to the guidelines outlined for all-ceramic (FPDs). A total of thirty-two (3-unit FPDs) partially-sintered zirconia frameworks were produced and divided into four equal groups of eight specimens each. In the first group (ST): full-contoured zirconia frameworks were fabricated with occlusal design without veneering, in the second group (LT): CAD/CAM and traditional layering technique, in the third group (OT): CAD/CAM and press-over technique, and for the forth group (CT): Copy-milling and traditional layering technique. All frameworks were subjected to 600,000 cycles of dynamic loading in water between 0-50 N by means of a hardened steel ball in a dual axis chewing simulator. After dynamic loading, all frameworks were cemented on their stainless steel dies using self-adhesive resin cement and loaded in a universal testing machine until failure occurred. One-way (ANOVA) and the Tukey’s post-hoc test were used to analyze the data (a=.05). Mean (SD) failure loads were 1504.2 (18.1) N for the anatomical group (ST), 1522.7 (40.6) N for the layering group (LT), and 1512 (48.3) N for the press group (OT). There were no statistically significant differences (P>0.05) between all investigated groups, whereas a significant effect was found between the copy-milled group 1010.2 (234.5) N and all CAD/CAM groups as revealed by the one-way (ANOVA) test (P?0.001). Within the limitations of this in-vitro study, Heat pressing glass ceramics or layering feldspathic porcelain did not show any significant difference in the fracture resistance of Y-TZP fixed partial dentures (FPDs). Conclusions Within the limitations of this in-vitro study, the following conclusions were drawn: 1- The flexural strength of the yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) ceramics is affected by the connector design. 2- Round connector design has higher potential than sharp design to withstand occlusal forces. 3- Increasing connector height decreases the failure probability. 4- The radius of curvature at the gingival embrasure strongly affects the flexural strength of simulated three-unit fixed partial dentures (FPDs), while the occlusal embrasure has a minor effect on the fracture resistance. 5- Connectors with minimum cross-section of 9 mm2 are recommended for posterior three-unit (Y-TZP) fixed partial dentures (FPDs). 6- Veneering techniques (heat pressing glass-ceramics or layering feldspathic porcelain) have no effect on the fracture resistance of (Y-TZP) fixed partial dentures (FPDs). 7- CAD/CAM zirconia frameworks elicited higher fracture resistance compared to copy-milled zirconia frameworks. 8- Dynamic loading in water did not have a significant effect on the fracture resistance.