Background: Long term prognosis semms to be reliable only in the front teeth. Exact studies on poor types of prognosis ("moderate" or "questionable") are rare. Hopeless teeth can often be retained unexpectedly long, should patients deny extraction.
Aim: Purpose of this retrospective study is to investigate over a period of 5 years, how teeth with the original prognosis classified "less than good" in patients with periodontitis have developed and possibly changed their prognosis.
Materials and Methods: Records of 43 patients with different types and degrees of severity of periodontitis, which were treated between 2001-2009 at the Bernhard Gottlieb clinic, Vienna were evaluated.
Records included data from the first exam and reevaluation during the first year and 5 years following the first exam. Each patient had undergone at least one series of conservative therapy (scaling and root planning, some received different types of surgical therapy, antibiotics or orthodontic appliances. 8 were smokers, 1 had diabetes and 23 suffered from chronic diseases (heart disease, asthma, allergy, arthritis). A prognosis was assigned to each individual tooth (good, moderate good, questionable and hopeless). Teeth that had been assigned "less than good" were analysed with respect to bone loss level.