This study aimed to examine the influence of osseointegrated implants on decision making for prosthodontic treatments. Twenty-five randomly selected Japanese dental clinicians in 1995 and 2005 with 5 to 15 years of clinical experience were requested to define bone support levels for prosthodontic treatment options. Comparison of the results expressed with the fuzzy function between 1995 and 2000 showed that indications for extraction have expanded with the prevalence of osseointegration concepts. Further, the definition of poor bone quality has changed. Osseointegration has influenced the decision-making process in prosthodontic treatments related to extraction.