Gingival retraction methods for fabrication of fixed partial denture: literature review

Fixed dental prosthesis success requires appropriate impression taking of the prepared finish line. This is critical in either tooth supported fixed prosthesis [crown and bridge] or implant supported fixed prosthesis [solid abutment]. If the prepared finish line is adjacent to the gingival sulcus, gingival retraction techniques should be used to decrease the marginal discrepancy among the restoration and the prepared abutment. Accurate marginal positioning of the restoration in the prepared finish line of the abutment is required for therapeutic, preventive and aesthetic purposes. In this article, conventional and modern methods of gingival retraction in the fixed tooth supported prosthesis and fixed implant supported prosthesis are expressed. PubMed and Google Scholar databases were searched manually for studies on gingival tissue managements prior to impression making in fixed dental prosthesis since 1975. Conclusions were extracted and summarized. Keywords were impression making, gingival retraction, cordless retraction, and implant. Gingival retraction techniques can be classified as mechanical, chemical or surgical. In this article, different gingival management techniques are discussed

[Control and eradication program for bovine brucellosis in Iran: an epidemiological survey]

Brucellosis is a zoonotic disease that is widely distributed throughout the developing countries. The status of bovine brucellosis combating program in Iran from beginning to now was reviewed. The information of 59 year combating against bovine brucellosis were obtained from Iran Veterinary Organization. Bovine brucellosis was first recognized in 1944 in Iran and is now endemic. In 1949, a bovine brucellosis combating program was setup which included vaccination of female calves with strain S19/RB51, infection diagnostic testing and slaughtering the infected cattle. Prevalence of brucellosis among industrial and semi-industrial dairy cattle calculated as 0.3%. Controlling and prevention of bovine brucellosis is far more complex than vaccination, testing and slaughtering the infected livestock. A financially well- supported control and eradication program and joint efforts between the farmers and governmental authorities are needed as a mean to prevent the spreading of disease. Without these, even a very good strategy will fail