Formation of the periodontal ligament.
D000818:Animals; D001641:Bicuspid; D003766:Dental Occlusion; D000882:Haplorhini; D010513:Periodontal Ligament / Q000254:growth & development; D010519:Periodontium / Q000033:anatomy & histology / Q000254:growth & development*; D014078:Tooth Eruption; D014092:Tooth Root / Q000254:growth & development