Tomographic evaluation of the mandibular nerve in the mental region and its surgical implications: a cross-sectional study |
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| Affiliation: | 1. Department of Postgraduation, ILAPEO College, Curitiba, Paraná, Brazil;2. Department of Dentistry, State University of Ponta Grossa, Ponta Grossa, Paraná, Brazil;3. School of Life Sciences, Pontifícia Universidade Católica do Paraná, Curitiba, Paraná, Brazil;1. The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine – Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, China;2. Department of Oral Maxillofacial–Head Neck Oncology, School and Hospital of Stomatology, Wuhan University, Wuhan, China;1. Faculty of Health, Social Care and Medicine, Edge Hill University, Ormskirk, UK;2. Liverpool Head and Neck Centre, Liverpool University Hospital Aintree, Liverpool, UK;3. Astraglobe Ltd, Congleton, Cheshire, UK;4. Department of Sport & Physical Activity, Edge Hill University, Ormskirk, UK;1. Department of Oral and Maxillofacial Surgery, School of Dentistry, University of Alabama at Birmingham, Birmingham, Alabama, USA;2. Department of Oral and Maxillofacial Surgery, School of Medicine, Emory University, Atlanta, Georgia, USA;3. Department of Anesthesiology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA;1. Plastic and Maxillo-facial Surgery Department, University Hospital Center of Toulouse, Toulouse, France;2. Otolaryngology, Head & Neck Surgery, King Khalid University, Kingdom of Saudi Arabia;3. Anatomy Laboratory, Paul Sabatier-Toulouse III University, Toulouse, France |
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| Abstract: | ![]()
The aim of this study was to evaluate the prevalence and length of the anterior loop (AL) of the inferior alveolar nerve, nerve emergence from the mental foramen, and prevalence of sensory disorders after implant placement in the interforaminal region. Four hundred and fifty hemimandibles (225 patients) were evaluated using cone beam computed tomography and panoramic radiographs. Information on the presence of sensory disorders was obtained from the medical records. AL prevalence was 13.6% and mean AL length was 1.25 mm. The false-negative rate for the identification of the AL using panoramic radiography was 58.6%. Straight nerve emergence from the mental foramen was the most prevalent (62.7%), followed by anterior (21.8%) and posterior (15.6%) emergence. The incidence of sensory disorders was 4.4%, and 1.1% were related to the presence of the AL. When implants were placed within the planned distance of the mental foramen or further, 1.2% had sensory problems associated with the presence of the mandibular incisive canal. In cases of distances smaller than planned, 12.9% had sensory alterations. Only five (1.1%) had the AL, with a length between 0 and 4.5 mm. However, in four cases, the planned distance was respected and, even so, there was a sensory disorder. Posterior nerve emergence from the mental foramen was associated with a higher prevalence of AL. |
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| Keywords: | cone-beam computed tomography mandibular nerve mental foramen dental implants anatomic variation |
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