Basic Informations

C.V

 

Personal information:

Name                : Doaa Abd ELAziz Ahmad Helal .

Date of birth    : 22/6/1975.

Email address  : doaahelal@bent.bsu.edu.eg

Mobile no.       : 00201006610275.  

Address            : Moustafa Alnahas St., Nasr City, Cairo, Egypt.                     

Social status     : married

Current Job       :  lecturer at Beni-suef University, faculty of dentistry, Fixed Proshtodontic department.

Qualifications:

1-Phd.in crown and bridge, crown and bridge department, march 2010, faculty of dentistry, Ain Shams University.

   Thesis Title: “comparing the effect of early full and progressive loading with two veneering materials on the osseointegration of single early loaded implants”.  

2-  MSC. in Restorative dentistry,  Fixed prosthodontics Department, August 2004,Faculty of Oral and Dental Medicine, Cairo University.

Thesis title: ‘’The effect of air abrasion on the strength of resin repaired fiber reinforced composite restorations’’.

MSC. studies included the following branches: Fixed Prosthodontics, Endodontics, Operative dentistry and Dental material.

3- Bachelor degree: Faculty of Oral and Dental Medicine, Cairo University, Egypt.

Graduation grade: very good with honors.

Graduation year: 1997.

Previous Work Experience:

a-Three years as a fixed prosthodontics lecturer at faculty of dentistry , Benisuef University, Egypt since 2015 till now.

b-since 2011 till 2015 I worked as an assistant professor of fixed prosthodontics at Alqassim university, faculty of dentistry for girls, KSA.

c- Eight years Experience in Teaching as a demonstrator, then as assistant lecturer and as a lecturer in Misr University for Science and Technology(MUST).

d- Alzahraa university hospital, Alazhar University for girls, for five years.

e- One year as an intern  in Kasr Elaini (for 6 months) , and Alzahraa hospital( for 6 months). Since first of November 1997 till 31 november1998.

Master Title

The effect of air abrasion on the strength of resin repaired fiber reinforced composite restorations (in-vitro study)

Master Abstract

Summary Fiber reinforced composite restorations are promising alternatives to all ceramic and ceramometallic restorations. repair of minor defects of the veneering material, can save the restoration from replacement . This study was designed to measure the shear bond strength of resin repaired Targis/Vectris restorations after using three different air abrasion pressures as a surface treatment . The Fracture strength of unrepaired Targis/Vectris crowns was measured and compared to the fracture strength of standardizedly repaired crowns using the most appropriate and selected pressure for surface treatment of the repair site. This was done to compare the effect of the repair procedures on the fracture strength of Targis/Vectris crowns. 50 standardized Targis/Vectris discs were fabricated and classified according to surface treatment protocol. Samples were classified into 5 groups (10 samples each). Group: A: control group, Targis/Vectris samples, Group B: no air abrasion treatment samples, Group C: air abraded samples using 40 psi., Group D: air abraded samples using 60 psi., and Group E : air abraded samples using 80 psi. Different air abrasion pressures were applied at a fixed distance of 2 cm. for 5 seconds, using a specially designed holder. Repair material was applied in a standardized form using a specially designed teflon mold (mold 2). To simulate conditions in the oral environment, each group was subdivided into 2 subgroups (5 samples each). The first Subgroup samples were water stored for 24 hours and the other subgroup samples were thermocycled for 500 cycle, before being tested. Shear bond strength between Vectris surface and the repair material was measured using Instron testing machine. Results were tabulated and statistically analyzed. Selected fractured samples, from each group, were subjected to scanning electron microscopic examination. Results of scanning electron microscopic examination and statistical analysis suggested the use of 40 psi. to be the most appropriate pressure for repair. This pressure caused a significantly high bond strength without compromising the microstructure of Vectris material. 10 standardized Targis/Vectris crowns were fabricated with the aid of polyethylene templates of the unprepared tooth. Epoxy resin material was poured inside the crowns to form the dies. Crown samples were divided into 2 groups (5 samples each). For the first group, the fracture strength of the unrepaired crowns was measured using Instron testing machine. Load was applied perpendicular to the long axis of the crown. For the second group, a standardized round area, of 5 mm. diameter, was removed from Targis material opposite to the mesiobuccal cusp of the crown. This area was then subjected to air abrasion of 40 psi. at 2 cm. diatance for 5 seconds prior to bonding agent application. The repair material was then applied. The fracture strength, of the repaired crowns, was measured in the same way and compared to the fracture strength of the unrepaired crowns. Results showed that the repair of a limited area, using the selected air abrasion pressure, did not cause a significant decrease in the fracture strength of the repaired crowns which furtherly confirm its safety use. Conclusions Under the testing conditions of this study the following conclusions could be drawn: 1- Among the two tested surface treatment protocols, air abrasion plus adhesive bonding produced the strongest bond that exceeds the shear bond strength of Targis/Vectris material regardless of the used pressure level. 2- Among the different tested pressures, the use of 40psi. air abrasion pressure was the most appropriate since it was capable of producing superficial surface roughening sufficient for achieving high bond strength without compromising the microstructure. Whereas, other pressures of 60 and 80psi. were too aggressive when used for 5 seconds at 2 cm. distance. 3- Repairing the restorations by composite resin plus adhesive bonding with no surface treatment significantly decreased the shear bond strength. 4- Thermocycling negatively affected the repair bond strength. 5- Targis/Vectris restorations with limited area of destruction can be successfully repaired using the selected 40 psi pressure for 5 seconds at 2 cm. distance without alteration in their resistance to fracture, thus furtherly confirming its safety use.

PHD Title

Comparing the Effect of Full and Progressive Loading Modalities with Two Veneering Materials on Osseointegration of Early Loaded Single-Tooth Implant

PHD Abstract

Comparing the Effect of Full and Progressive Loading Modalities with Two Veneering Materials on Osseointegration of Early Loaded Single-Tooth Implant A Thesis Submitted to The Faculty of Dentistry, Ain-Shams University In Partial Fulfillment of the Requirements of the Doctor Degree in Fixed Prosthodontics By Doaa Abd El Aziz Ahmed Helal B.D.S.( Cairo University, 1997) M.Sc.( Cairo University, 2004) Faculty of Dentistry Ain-Shams University 2009 Supervisors Dr. Mona Ali Shoeib Dr. Amina Mohamed Hamdy Professor of Oral Medicine, Diagnosis and Periodontogy Faculty of Oral and Dental Medicine Cairo University Associate Professor of Fixed Prosthodontics Head of Crown and Bridge Department Faculty of Dentistry Ain- Shams University Dr. Salah Abdel Fatah Ahmed Dr. Jehan Farouk Younis Assocociate Professor of Oral Surgery Faculty of Dentistry Ain-Shams University Assocociate Professor of Fixed Prosthodontics Faculty of dentistry Ain- Shams University Summary and Conclusions The use of an implant-supported single crown as a treatment for a single missing tooth is considered a highly successful treatment option. Early loading protocol with a reduced healing time can increase the patient satisfaction both functionally and esthetically. Progressive loading is a gradual prosthetic loading treatment option that was recommended to be used in cases of reduced bone density to improve its quality. The purpose of this study was to compare the effect of full and progressive loading modalities with two veneering materials (Porcelain and composite resin) on osseointegration of early loaded single tooth implant. Twenty implant-supported single crowns were loaded following the early loading protocol after one month from the surgery. In the first group, ten patients received fully loaded implant-supported single crowns. In the second group, ten patients received progressively loaded implant-supported single crowns. Progressive loading was carried out by using heat-cured acrylic resin temporary crowns placed out of occlusion for two month. Then, by addition of self cure acrylic resin on the occlusal table, crowns were placed into full occlusion for another 2 months. After that, defentive restorations were delivered five months from the surgery date. For both groups, defentive restorations were full veneered single crowns with either porcelain (Vita VM9) or composite resin (SR Adoro) as a superstructure veneering material. Implants and peri-implants soft and hard tissues were evaluated clinically and radiographically. Clinical evaluation included recording gingival index, probing depth and implants mobility that were measured using the periotest. Radiographic evaluation of the cases was done using standardized periapical radiographs with aluminium step wedges fixed to the front side of the film packing's. Digora software was used to measure the crestal bone loss and the equivalent aluminium thickness values of peri-implants bone density. Data were recorded, collected and statistically analyzed. Results of the study revealed statistically significant improvement in mean implant mobility, tatistically significant increase of the mean probing depth during the study time. In addition to this, results of the radiographic tests revealed a statistically significant improvement of the peri-implant bone density. Results showed a statistically significant increase in the peri-implants crestal bone loss. However, no statically significant change of the gingival index was found. All implants were both clinically and radiographically successful. Within the limitations of this study, the following was concluded: 1-The early loading protocol (after 1 month from surgery) produced successful results, both clinically and radiographically, and proved to provide a reliable and effective loading protocol. 2- The full and progressive early loading protocols produced similar effect on peri-implant hard and soft tissues. 3-The used superstructure veneering materials (Vita VM9 porcelain and SR Adoro composite resin) had similar effect on peri-implants hard and soft tissues. 4-A statistically significant improvement of the bone density and implant stability was observed, during the study time. 5-A statistically significant increase of the crestal bone loss and the probing depth was observed, during the study time. 6- The use of full and progressive early loading protocols with the used superstructure veneering materials did not adversely affect the health of the peri-implant gingival tissues.