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Objectives The location of the mandibular foramen is essential for the quality of the inferior alveolar nerve block anaesthesia and has often been studied with contradictory results over the years. The aim of this study was to locate the mandibular foramen, according to the dental age of the subject, through 3D analysis. Methods Three-dimensional images were reconstructed from mandibular computed tomography of 260 children, adolescents and adults. The occlusal plane was determined as the average plane passing through the buccal cusps of mandibular molars, premolars, and canines, and through the incisor edge. The mandibular foramen was located three dimensionally in relation to the anterior edge of the ramus (or coronoid notch), the sagittal plane and the occlusal plane. Results All along mandibular growth, the three distances defining the relative position of the mandibular foramen showed negligible changes. The mandibular foramen is located from − 0.4 to 2.9 mm above the occlusal plane. The distance between the mandibular foramen and the leading edge of the mandibular ramus ranged from 17 to 19.5 mm. The angle between the ramus and the sagittal plane ranged from 3° to 5.4°. Conclusion In our sample, and using the occlusal plane and the anterior edge of the ramus as anatomical references, the location of the mandibular foramen was considered to be similar in all patients regardless of age.

Epidermolysis bullosa (EB) is a group of rare skin diseases that can strongly affect the oral mucosa. The aim of the study was to describe the perception of oral health– related quality of life (OHRQoL) in children living with EB. A quantitative and qualitive study was conducted. First, a quantitative analysis was used to compare the Child Oral Health Impact Profile (COHIP) scores of 23 patients living with EB to normative values. Second, a qualitative approach was taken to help understand the oral health experience of 10 children (aged 5–17 y) living with EB until thematic saturation was reached. For every COHIP domain, the scores were significantly lower in patients living with EB than in healthy patients (P = 0.001). The thematic analysis provided several themes: young patients suffer from EB oral complications, with which they deal in different ways; they experience functional disorders, mainly in eating and speaking; and they also require esthetic dental care. The results of this mixed-method study show that, from the perspective of affected children, that EB affects OHRQoL. Using the children’s own words makes it possible to understand both the difficulties they face and their ability to adapt to these difficulties. Their words also show us what they want from the treatment and help us to identify means of improving practices. Knowledge Transfer Statement: The results of this study confirm the difficulties experienced by patients in the oral sphere. They also show that patients are able to adapt and that their demands go beyond functional rehabilitation. This work should encourage dental practitioners to be part of the overall management of the disease, involving regular checkups, preventive dental measures, and oral hygiene education. Therefore, more effective communication is required, not only between the dental and dermatological teams but also with the parents and caregivers.