Societa Italiana di Odontoiatria Conservatrice (SIDOC) This Society, the equivalent of the British Association for Teachers of Conservative dentistry (BACTD) was formed by Professor Guido Goracchi, and other Italian Professors of Conservative Dentistry, in the 1990s. The society, which continues to thrive and hold an annual congress, has had two ties ( Original - 22686.9 – condition, worn; replacement - 22686.6 – condition, good).