"Phenomena at the interface fixed attachment/enamel", Oral presentation, World Federation of Orthodontists & 6th International Orthodontic Congress, Paris, Sept 10-14, 2005

"Biomaterials and Health risks", Conference at the Kaunas Univ. of Medicine, Lithuania, Sept. 19, 2005

"Biomaterials and Health risks", Conference at the Riga Stradins University, Stomatological Institute, Sept. 23, 2005

"Biomaterials and Health risks", Conference at the Medical University, Warsaw, Poland: , Sept. 27, 2005

"Surfactants Can Improve the Resin Sealing and Bonding of Hydrophilic Substrates", Conference at the 105 th American Association of Orthodontics Annual Session, May 2005, San Francisco, California.

"The two facets of some dental biomaterials", Conference at the International symposium "Biomaterials and Medical Devices" BiomedD'2004, November 5-7 2004, "Politehnica" University Bucharest and the "Gr. T. Popa" University of Medicine and Pharmacy, Iasi, both in Romania

"Challenges in medical in-situ biomaterials' polymerizations", Matasa CG & Balaban AT, Conference at the International symposium "Biomaterials and Medical Devices" BiomedD'2004, November 5-7 2004, "Politehnica" University, Romania

"Reactive Gel Entrapment, a new Method to Evaluate leaching biomaterials", Conference at the International symposium "Biomaterials and Medical Devices" BiomedD'2004, November 5-7 2004, "Politehnica" University and the "Gr. T. Popa" University of Medicine and Pharmacy, Iasi, both in Romania

"Static magnets, analgesics?", Conference at the 10th International Symposiuum on Molecular Medicine, Univerity of Medicine and Pharmacy "Iuliu Hatieganu" and the Academy of Medical Sciences, Cluj Napoca, May 24, 2004, Romania

"The bond strength of improved resin-based adhesives", Conference at the European Orthodontic Society Annual Meeting in Aarhus, June 2004

"Screening biomaterials for safety", Conference at the European Orthodontic Society Annual Meeting in Prague, June 2003

"Do-it-yourself methods of testing orthodontic attachments". Course at the University of Xi' An, Jiaotong, College of Stomatology, China, September 13, 2002

"Do-it-yourself methods of testing orthodontic attachments". Course at the Nippon Dental University, Tokyo, Japan, September 17, 2002

"Plastics in medicine :progress and problems". Conference awarded with the "Prize for Excellence", Academy of Sciences, Literature and Arts, Oradea, _Romania, June 10, 2002

"Direct bonding brackets. Do-it-yourself methods for testing". Conference at the 102nd American Association of Orthodontists Annual Session, Philadelphia, _May 5, 2002.

"Les nouveaux materiaux au service de l'orthodontie moderne" [French]
_[New materials in modern orthodontics]. Presented at "Les journees de l'orthodontie", French Orthodontic Federation, Palais des Congres, Paris, November 10, _2001.

"Understand your materials"
_Workshop at the 73rd Scientific Reunion of the French Society of Orthopedic Dentistry, Deauville, May 14, 1999.

"Trends in new materials"
_Plenary conference at the 73rd Scientific Reunion of the French Society of Orthopedic Dentistry, Deauville, May 14, 1999.

"Modern methods for the high-tech manufacture of minute steel devices"
_Conference at the international symposium "Traditions and perspectives in the Romanian School of Metallurgy", October 25-26 and at the Institute for
_Non-ferrous and Rare Metals, October 31, 1996, Bucharest, Romania.

"Orthodontic biomaterials: Past, present and future"
_Conference at the IInd Romanian National Assoc. of Orthodontists, Bucharest, Romania, October 25-26, 1996.

"Tendencias en brackets de cementado directo"
_Plenary conference at the 9th Venezuelan Congress of Orthodontics (2 hours), Caracas, Venezuela, Nov. 10, 1995.

"Trends in direct bonding brackets"
_Conference at the IInd Arab Orthodontic Congress, Tunis, Tunisia, Oct. 22, 1995.

"Biomateriaux en medicine et stomatologie. Aspects"
_Conference at the "XIV-eme Session des Journees Medicales Balkaniques", Satu Mare, Romania, Oct. 8, 1995.

"Biomaterials in orthodontics"
_Seminar (full day) given at the GOOD Annual Reunion (Gnathology, Orthopedics and Orthodontics in Dentistry) Concord, CA, September 12, 1995.

"Mechanical and Chemical Properties of Brackets"
_Lecture at the Alexandria University, Faculty of Dentistry, Egypt, March 30, 1995.

"Myths and Facts in Orthodontic Materials"
_Lecture at the Cairo University, School of Dental Medicine, Egypt, March 25, 1995.

"Evolution and Trends in Fixed Attachments"
_Lecture at the M. & G. Goldschleger School of Dental Medicine, Tel Aviv University, Israel, March 23, 1995.

"Myths and Facts in Orthodontic Materials"
_Lecture at the Israeli Orthodontic Society Annual Meeting, Tel Aviv, Israel, March 22, 1995.

"Microbial Attack of Orthodontic Adhesives and Attachments"
_Lecture at the Hebrew University, Jerusalem, Israel, March 20, 1995.

"Microbial Attack of Acrylates"
_Conference at the Second Congress of Dentists,University N. Testemitanu, Kishinev, Moldova, December 1994.

"Corrosion of Stainless Steel in the Oral Environment"
_Conference at the Second Congress of Dentists, University N. Testemitanu, Kishinev, Moldova, December 1994.

"Orthodontic Biomaterials"
_Courses at the I. P. Pavlov Medical University, St. Petersburg, Russia, October 6 and 7, 1994.

"Biomaterials in Fixed Orthodontics"
_Courses at the N. A. Semashko Medical Institute, Moscow, Russia, October 3 and 4, 1994.

"Biomaterials in Orthodontics. Aspects"
_Courses held at the , Kishinev, Moldova, September 28 and 29, 1994.

"Recent Advances in the Biomaterials used in Dentistry"
_Conference at the 3rd International Dental Congress of the Association of Free-lance Dentists, Constanta, Romania, September 24, 1994.

"Bio-Materials in Orthodontics"
_Courses held in tandem with Prof. dr. Oscar J. Quiros A., Chairman and Professor, Orthodontic Dept. of Univ. Central de Venezuela (Caracas), at the Xth _Aniversario Seminario Annual 1984- 1994" of "Centro de Estudios Superiores de Ortodoncia", Mexico City, August 12 and 13, 1994.

"Bio-Materials in Orthodontics"
_Conference held at Sociedad de Exalumnos Unitec-Ortodoncia, Mexico City, August 11, 1994.

"Stainless steels in orthodontics, today"
_Conference at Universidad Latino-Americana, Mexico City, August 10, 1994.

"Influencia de las propriedades clinicas de los brackets, y temas de corosion"
_Courses held at the Centro Europeo de Ortodoncia, CEOSA/ Cervera, Madrid, Spain, July 12, 13 and 14, 1993.

"Bracket-Technologie". Kieferorthopadische Fortbildung im Sommer 1993"
_(Direct bonding brackets. Technological aspects, Summer courses 1993)
_Full day lecture, Innsbruck University, (Prof. Dr. M. Richter Courses), Austria, July 16, 1993.

"Aspects modernes de la bio-compatibilite" ( Modern aspects of bio-compatibility)
_Conference at "Les Journees Stomatologiques Internationales", a joint meeting of "Association Stomatologique Internationale", Paris, "Est-West Ortho-Club", _Brussels, "Entente Medicale Mediteraneene", Bucharest, and "St. Apollonia University", Jassy, Romania, June 8, 1993.

"L' evolution des materiaux en orthodontie fixe. Problemes et solutions"
_(The evolution of the materials used in fixed orthodontics. Problems and solutions)
_Conference at the 66th European Scientific Reunion of the Societe Francaise d'Orthopedie Dento- Faciale, Paris, France, May 31, 1993.

"Trends in Direct Bonding Brackets"
_Lecture at the David B. Kryser Dental Center, College of Dentistry, New York University, December 9, 1992.

"La corrosion de los aparatos fijos" (The corrosion of fixed appliances).
_Conference held at the Vth International Congress of Orthodontics of Central America and Panama (FAOCAP), Tegucigalpa, Honduras, September 3, 1992.

"Optimize your use of direct bonding appliances"
_Conferences held at the "VIII Aniversario Seminario Annual" of the "Centro de Estudios Superiores de Ortodoncia", Mexico City, Febr. 21 to 23, 1992 (Courses _held in tandem with Prof. W. M. Davidson, Chairman and Professor, Orthodontic Dept. of the Univ. of Maryland ).

"Pegar brackets metalicos por metodo directo" (Direct bonding of metallic brackets)
_Conference at the Ist Congress and IIIrd Seminary of the Latin-American Orthodontics Association, Lima, Peru, February 26, 1993.

"Bacterial Oral Decay of Orthodontic Adhesives"
_Conferences at the David B. Kryser Dental Center, College of Dentistry, New York University, April 10, 1992

"What makes 'Memory Wires' tick ?"(Metallurgy and properties of superelastic alloys)
_Lecture presented at the David. B. Kryser Dental Center, College of Dentistry, New York University, Nov. 8, 1991.

"How to Better Use your Direct Bonding Appliances"
_Lecture presented at the David. B. Kryser Dental Center, College of Dentistry, New York University, Nov. 8, 1991.

"Tendencias en Brackets Metalicos de Cementation Directa"
_Conference at the IVth International Congress of Orthodontics of Central America and Panama (FAOCAP), Panama City, Panama, March 21, 1991.

"Trends in Direct Bonding Brackets"
_Conference held at the "Twenty- Fifth Indian Orthodontic Conference", Bombay (India), Jan.1991, and also at the University of the West "Vasile Goldis", Arad _(Romania), October 15, 1991, at the Medical-Pharmaceutical Institute of Bucharest (Romania), October 20, 1991, and at the Faculty of Medicine and Odontology, _N. Testemitanu University, Kishinev, Moldova October 23, 1991.

"Trends in Direct Bonding Appliances"
_Conference at the XVIth "Cours International de Stomatologie Infantile" joint meeting of the Union Medical Balkanique and the Entente Medicale Mediteranee, _Piatra Neamt, Romania, July 1990.

"The Retention of Orthodontic Fixed Appliances"
_Conference held at the Vth General assembly of the Assoc. Latino Americana de Ortodoncia, La Paz, Bolivia, March 28, 1990.

"Systematic Errors in the Manufacture of Fixed Appliances"
_Conference held at the IIIrd International Orthodontic Congress of Central America and Panama (FAOCAP), Guatemala City, Guatemala, March 28, 1990.

"Metal vs. Ceramic in Fixed Orthodontic Appliances"
_Conference at the 1st International Symposium of Orthodontics of the "San Francisco University", Braganca Paulista, Brasil, July 30, 1989.

"Ceramic Brackets: Progress or Problem"
_Conference held at the Associacion Argentina de Ortodoncia, Buenos Aires, Argentina, Aug.3, 1989.

"Direct Bonding Brackets Reconditioning"
_Conference held at the Santiago de Chile University, August 1, 1989.

"Removal and Reconditioning of Direct Bonding Brackets"
_Conference held at Sociedade Paulista de Ortodoncia, Sao Paulo, Brasil, Febr. 14, 1989.

"Metal vs. Ceramic Orthodontic Appliances"
_Conference held at the Sociedad Paranense de Ortodoncia, Curitiba, Brazil, Febr. 15, 1989.