Furcation depth and interroot separation dimensions for 5 different tooth types

The purpose of this study was to document mean, standard deviation, and ran ge of furcation depth and interroot separation dimensions of 5 multi-rooted tooth types. A total of 412 extracted teeth were examined and classified a s: maxillary first molar maxillary second molar maxillary first premolar ma ndibular first molar. and mandibular second molar The furcation depth was m easured at the level of the furcation dome and 3 and 5 mm apical to the dom e. Interroot separation was measured 3 and 5 mm apical to the furcation dom e. Mean furcation depth at the dome was 7.48 mm buccally and 6.67 mm mesiod istally for maxillary first molars. 6.69 mm buccally and 5.94 mm mesiodista lly for maxillary second molars, 3.54 mm mesiodistally for maxillary first premolars; 7.96 mm buccolingually for mandibular first molars; and 7.46 mm buccolingually for mandibular second molars. Interroot separation dimension s 3 mm epical to the dome were: 2.56 mm buccally 4.17 mm mesially and 4.48 mm distally for maxillary first molars, 1.92 mm buccally 3.89 mm mesially a nd 4.04 mm distally for maxillary second molars, 2.47 mm mesially and 2.58 mm distally for maxillary first premolars. 3.15 mm buccally and 2.95 mm lin gually for mandibular first molars,. and 2.54 mm buccally and 2.75 mm lingu ally for mandibular second molars.