Three orthodontic cases groups have been studied in order to analyze third lower molar: first lower molar extraction cases,
first lower bicuspid and non extraction cases. Eruption space for the wisdom lower molar has been established, through different
values: distance to the anterior border of the ramus and inclination of the third molar crown. Results of the study show a better
eruption pattern in the first lower molar extraction cases, and a more favourable uprighting of the wisdom molar in the bicuspid
extraction cases. Both values results show a bad eruption pattern in the non extraction cases.
(Rev Esp Ortod. 2003;33(3):233-248)