Conferences

• First Dental Course in Spanish, Director and Invited Speaker, October 15-17, 1984.
• Baylor College of Dentistry.
• Meeting of the Dental Federation of Central America and Panama, December 1984, San José, Costa Rica, Central America.
• "Combined Fixed and Removable Oral Rehabilitation”
• "Problems in Metal Porcelain Restoration"
• "Design of Metallic Structures for Porcelain”.
• Study group Julio Oscar Novoa, December 12, 1984, San Salvador, El Salvador, Central America, "Problems in Restorations in Metal Porcelain"
• Salvadorian Association of Dental Technicians, December 13, 1984, San Salvador, El Salvador, Central America.
• "Alternatives in alloys for porcelain".
• "Problems in Porcelain Metal Restoration".
• "Design of metal structures for porcelain”.
• University of El Salvador, Dental Faculty, December 14-25, 1984, San Salvador, El Salvador, Central America.
• "Functional and Esthetic Oral Rehabilitation".
• "Design of metallic structures for porcelain”.
• "Complete Rehabilitation with fixed prosthesis"
• Unitek Laboratory Symposium, May 16, 1985, Harlingen, Texas, "Framework Design in Ceramic-metal Restorations.”
• American Association of Dental Research, April 1985, Las Vegas, Nevada, “Strength of Soldered Joints for Pd-Rich and Au-Pd casting Alloys.”
• Annual Seminar of Study Group, Ciudad Acuña. October 10-13, 1985, Ciudad Acuña Coahuila, México.
• “Preparations in fixed prosthesis”.
• “Structural design in fixed prosthesis”.
• “Porcelain creations”.
• “Esthetic functions in oral rehabilitation”.
• “Complete rehabilitation with fixed prosthesis”.
• Salvadorian Dental Association, Dentist’s week Annual Meeting, October 3-4, 1985. San Salvador, El Salvador, Central America.
  "Preparations in fixed prosthesis".
  "Structural design in fixed prosthesis".
  "Porcelain creations".
  "Esthetic functions in oral rehabilitation".
  "Complete rehabilitation with fixed prosthesis".
• American Association of Dental Research, March 1986, Washington, D.C.
• "Comparison of Pd-based and Au Alloys for Ceramometal Restoration".
• New Concepts in Periodontics – Prosthodontics, October 25, 1986, Baylor College of Dentistry, Dallas, Texas, presented by Dr. Rafael E. Lorenzana and Dr. Hilton Israelson.
• New Concepts in Periodontics – Prosthodontics, Graduate Periodontics, University of Nuevo León, April 22, 1987, Baylor College of Dentistry, Dallas, Texas.
• Dental Society of El Salvador, Odontologist´s week, October 4 - 5, 1988, San Salvador, El Salvador, Central America, "Prosthetic rehabilitation over implants".
• Dallas Country Dental Society, "Dallas Mid-Winter Dental Clinic", January 28, 1989, Dallas, Texas – Perio-Prosthodontics".
• Texas Dental Association, "119th TDA Annual Session ", May 6, 1989, San Antonio, Texas, "Dental Implants: A Prosthodontist Approach".
• Advances in Implantology, Dallas, Texas. October, 1991.
• Dental Implants and Prosthodontics, Plano Study Group, Plano, Texas, July 1992.
• Congress of the Dental Federation of Central America and Panama, Nov. 1992, San Salvador, El Salvador, Central America, "Rehabilitation with fixed prosthesis."
• Congress of the Dental Federation of Central America and Panama, Nov. 1993. San Salvador, El Salvador, Central America.
• "Complex Rehabilitations with fixed prosthesis”.
• Texas Dental Association "T.D.A. Annual Session", May 1994, “Complete Dentures".
• "Implantology in general dentistry". Oral – B, August 25, 1994. San Salvador, El Salvador, Central America.
• Western Dental Association, January 28, 1995. Santa Ana, El Salvador, Central America.
• "Complete Prosthesis".
• Eastern Dental Association, March 11, 1995. San Miguel, El Salvador, Central America.
• "Oral Implantology" San Salvador, El Salvador, Central America..
• Salvadorian Association of Dental Enterprises, March 31, 1995, San Salvador, El Salvador, Central America.
• "Prosthesis and Implantology".
• Dental Association of El Salvador, May 12, 1995. San Salvador, El Salvador, Central America.
• "Fixed prosthesis innovations". Colombian Association of Prosthodontics, August 25-26, 1995, Santa Fé de Bogotá, D.C. Colombia.
• "Osseo integrated implants, surgery and rehabilitation” Colombian Association of Prosthodontics, August 25-26, 1995, Santa Fé de Bogotá, D.C. Colombia.
• Dental Association of Suchitepéquez, A.O.S. August 31, September 1°-2, 1995, Mazatenango, Suchitepéquez, Guatemala, Central America. "Dental Implantology".
• Prosthodontics Association of El Salvador, February 1996, San Salvador, El Salvador, Central America. Invited speaker in the Second Meeting of Prosthodontics.
• Salvadorian University "Alberto Masferrer", June 27, 1996, San Salvador, El Salvador, Central America.
• "Oral Implantology".
• International Meeting of the Latin American Odontological Organization, November 27-30, 1997, Perú, South America.
• "Prosthesis supported by implants" XXX Dental Panamenian Annual Meeting, January, 28-31, 1998, Panamá, Central America.
• "Design of metallic structures for porcelain” XXX Dental Panamenian Annual Meeting, January, 28-31, 1998, Panamá, Central America.
• Fixed Prosthesis, XXX Dental Panamenian Annual Meeting, January, 28-31, 1998, Panamá, Central America.
• "Complete rehabilitation with fixed prosthesis". XXVIII Meeting of the Dental Federation of Central America and Panama, March 2-6, 1998. Managua, Nicaragua, Central America.
• "Functional and Esthetic Oral Rehabilitation ". 1st Latin American Meeting and 4th National Symposium of Education and Prevention of Oral Health organized by the Dental Confederation of Argentina, April 29 – May 1, 1999.
• "Implants over Prosthesis”, Dominican Dental Association, Dominican Republic, 26-30 May 1999.
• Health Care Reform Environmental Commission, “Universal Insurance”, 20-21 July, 1999.
• Health Care Reform in El Salvador- National Council of Health Care Reform, 2000.
• Health Care Reform in Colombia- National Council of Health Care Reform, February 2000.
• “Surgical and Prosthetics Considerations in Implantology”, Evangelic University, invited Speaker. San Salvador, El Salvador. Central America. October 2008.
• “Dental & Cosmetic Tourism”, Medical Tourism Congress, organized by the Medical Tourism Association, Invited Speaker, Los Angeles, California, USA, 2009.

Relevat Professional Activities

• Evaluation of Colombia Health Care System. Bogotá Colombia 28 October - 1 November 1998.
• Evaluation of Costa Rica Health Care System Costa Rica, San José 2-6 November 1998.

Publications Articles

• "Optimum Thickness of Opaque and Body Porcelain", Lorenzana, R.E., and Barghi, N., Journal of Dental Research, March 1980.
• "Fractured Porcelain Under Impact Loading and Slow Application of Load", Barghi, N., Pedrero, A., Lorenzana, R. E., Journal of Dental Research, March 1981.
• "Strength of Soldered Joints for Pd-Rich and AU-Pd Casting Alloys" Lorenzana, R.E., Staffanou, R.S., Marker, V.A., Austin, L.K., and Okabe, T., Journal of Dental Research, April 1985.
• Ceramo-metal Bond Strength of Four Palladium-Rich Alloys", Lorenzana, R. E., Chambless, L.A., Marker, V.A., and Staffanou, R.S., Journal of Dental Research, April, 1985.
• "Ceramo-metal Bond Strength of Four Palladium-Rich Alloys", Lorenzana, R. E., Chambless, L.A., Marker, V.A., and Staffanou, R.S., and Chambless, L.A., Journal of Dental Research, April 1985.
• "Ceramo-metal Bond Strength of Four Palladium-Rich Alloys", Lorenzana, R. E., Chambless, L.A., Marker, V.A., and Staffanou, R.S., Reprinted Journal of Prosthetic Dentistry 54:585, October 1985.
• Comparison of Pd based and Au-alloy for Ceramo Metal Restorations, Lorenzana, R.E., Marker, V. A., Staffanou, R. S., Chambless, L.A., submitted to the American Association Of Dental Research.

Other Articles

• "Antibiotics in Dentistry", Castro, S. M., Lorenzana, R. E., Graduation Thesis, University of El Salvador, 1972.