2. Lack of intra-operative periodontal therapy. In spite of the relative suitable oral hygiene exhibited by the patient, no trans-operative periodontal therapy was conducted scaling and root planning. This could have triggered a «sequestration» of bacterial plaque remnants which could have remained underneath the lesion during healing process, causing thus a chronic infectious focus which paved the way for a recurrence.
2. Ausencia de terapia periodontal intraoperatoria: a pesar de la relativa buena higiene oral de la paciente, no se realizó terapia periodontal transoperatoria raspado y alisado radicular, lo que pudo desencadenar un «secuestro» de restos de placa bacteriana que permanecieron debajo de la lesión durante la cicatrización, provocando el proceso infeccioso crónico que dio paso a la recidiva.