Fig. 11From: Soft-tissue grafting for peri-implantitis—a treatment option in case of unsuitable skeletal basic morphology of the alveolar bone and lack of keratinized mucosa: a retrospective clinical cohort studySchematic illustration of the apical base in the mandibular symphysis. A semi-quantitative measurement was made in this area. The vertical red lines represent the width of the alveolar bone in the apical region of the tooth/implantBack to article page