Early Photobiomodulation for Post-Traumatic Trigeminal Neuropathy After Posterior Mandibular Implant Retreatment: A Case Report

Early Photobiomodulation for Post-Traumatic Trigeminal Neuropathy After Posterior Mandibular Implant Retreatment: A Case Report | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Case Report Early Photobiomodulation for Post-Traumatic Trigeminal Neuropathy After Posterior Mandibular Implant Retreatment: A Case Report Maurício Veríssimo Pereira, Guilherme Miguel Moreira de OLIVEIRA, and 4 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8545219/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 10 You are reading this latest preprint version Abstract Background Implant dentistry has advanced steadily since the advent of osseointegration with endosseous implants in the latter half of the 20th century. Despite overall safety, surgical complications, such as injuries to adjacent tissues and neural structures, remain a concern. These complications are often attributable to the anatomy of the operative site and can lead to significant sensory disturbances and persistent neuropathic hyperalgesia, with consequent functional impairment and psychological distress for patients. Case Presentation A 63-year-old man developed severe neuropathic pain and sensory deficit in the mental region days after reimplantation with short implants. To enable a more precise phenotypic characterization, pain was assessed with the Neuropathic Pain Symptom Inventory (NPSI) and Numeric Rating Scale (NRS). A combined therapeutic approach was implemented, integrating pharmacotherapy with early photobiomodulation (PBM) to the mental region (660/808 nm diodes, contact mode, 6 J per point; three sessions). As a result, the report of global pain intensity, measured by the NRS, dropped from 8 (severe intensity) in the baseline NPSI to zero (no pain) after the first PBM session and remained thereafter, allowing early discontinuation of analgesics. The NPSI Score decreased from 63/100 to 2/100 (96.8% reduction) with no domain-level worsening. Conclusions This case illustrates the feasibility of early, focal PBM as an adjunct for painful post-traumatic trigeminal neuropathy following implant retreatment, with rapid symptom relief, functional recovery and a potential role in preventing the chronification of neurosensory symptoms related to mental nerve injury and supports further study to define optimal timing and dosimetry. Photobiomodulation neuropathic pain inferior alveolar nerve implant retreatment case report Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Review Version 1 posted Editorial decision: Revision requested 11 Feb, 2026 Reviews received at journal 27 Jan, 2026 Reviews received at journal 27 Jan, 2026 Reviewers agreed at journal 25 Jan, 2026 Reviewers agreed at journal 23 Jan, 2026 Reviewers agreed at journal 22 Jan, 2026 Reviewers invited by journal 20 Jan, 2026 Editor assigned by journal 09 Jan, 2026 Submission checks completed at journal 09 Jan, 2026 First submitted to journal 07 Jan, 2026 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-8545219","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Case Report","associatedPublications":[],"authors":[{"id":574678565,"identity":"cd7057ba-fc6f-4c7b-91e3-4188c57294c1","order_by":0,"name":"Maurício Veríssimo 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Report","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":true,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"bmc-oral-health","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"ohea","sideBox":"Learn more about [BMC Oral Health](http://bmcoralhealth.biomedcentral.com/)","snPcode":"","submissionUrl":"https://www.editorialmanager.com/ohea/default.aspx","title":"BMC Oral Health","twitterHandle":"BMC_series","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"em","reportingPortfolio":"BMC Series","inReviewEnabled":true,"inReviewRevisionsEnabled":true},"keywords":"Photobiomodulation, neuropathic pain, inferior alveolar nerve, implant retreatment, case report","lastPublishedDoi":"10.21203/rs.3.rs-8545219/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-8545219/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003ch2\u003eBackground\u003c/h2\u003e \u003cp\u003eImplant dentistry has advanced steadily since the advent of osseointegration with endosseous implants in the latter half of the 20th century. Despite overall safety, surgical complications, such as injuries to adjacent tissues and neural structures, remain a concern. These complications are often attributable to the anatomy of the operative site and can lead to significant sensory disturbances and persistent neuropathic hyperalgesia, with consequent functional impairment and psychological distress for patients.\u003c/p\u003e\u003ch2\u003eCase Presentation\u003c/h2\u003e \u003cp\u003eA 63-year-old man developed severe neuropathic pain and sensory deficit in the mental region days after reimplantation with short implants. To enable a more precise phenotypic characterization, pain was assessed with the Neuropathic Pain Symptom Inventory (NPSI) and Numeric Rating Scale (NRS). A combined therapeutic approach was implemented, integrating pharmacotherapy with early photobiomodulation (PBM) to the mental region (660/808 nm diodes, contact mode, 6 J per point; three sessions). As a result, the report of global pain intensity, measured by the NRS, dropped from 8 (severe intensity) in the baseline NPSI to zero (no pain) after the first PBM session and remained thereafter, allowing early discontinuation of analgesics. The NPSI Score decreased from 63/100 to 2/100 (96.8% reduction) with no domain-level worsening.\u003c/p\u003e\u003ch2\u003eConclusions\u003c/h2\u003e \u003cp\u003eThis case illustrates the feasibility of early, focal PBM as an adjunct for painful post-traumatic trigeminal neuropathy following implant retreatment, with rapid symptom relief, functional recovery and a potential role in preventing the chronification of neurosensory symptoms related to mental nerve injury and supports further study to define optimal timing and dosimetry.\u003c/p\u003e","manuscriptTitle":"Early Photobiomodulation for Post-Traumatic Trigeminal Neuropathy After Posterior Mandibular Implant Retreatment: A Case Report","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2026-01-16 11:00:51","doi":"10.21203/rs.3.rs-8545219/v1","editorialEvents":[{"type":"communityComments","content":0},{"type":"decision","content":"Revision requested","date":"2026-02-11T05:33:59+00:00","index":"","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2026-01-27T20:47:39+00:00","index":"hide","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2026-01-27T18:03:17+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"135887530438205921248877844735467335455","date":"2026-01-25T21:12:20+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"303539300131166803087350318658236451739","date":"2026-01-23T16:18:42+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"44573353907155287570367380414047472268","date":"2026-01-22T15:45:32+00:00","index":"hide","fulltext":""},{"type":"reviewersInvited","content":"","date":"2026-01-20T15:38:52+00:00","index":"","fulltext":""},{"type":"editorAssigned","content":"","date":"2026-01-09T15:49:31+00:00","index":"","fulltext":""},{"type":"checksComplete","content":"","date":"2026-01-09T15:49:03+00:00","index":"","fulltext":""},{"type":"submitted","content":"BMC Oral Health","date":"2026-01-07T21:15:04+00:00","index":"","fulltext":""}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"bmc-oral-health","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"ohea","sideBox":"Learn more about [BMC Oral Health](http://bmcoralhealth.biomedcentral.com/)","snPcode":"","submissionUrl":"https://www.editorialmanager.com/ohea/default.aspx","title":"BMC Oral Health","twitterHandle":"BMC_series","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"em","reportingPortfolio":"BMC Series","inReviewEnabled":true,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"c585a880-c983-4ee5-9c57-c9f51e38e202","owner":[],"postedDate":"January 16th, 2026","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"under-review","subjectAreas":[],"tags":[],"updatedAt":"2026-05-18T12:38:32+00:00","versionOfRecord":[],"versionCreatedAt":"2026-01-16 11:00:51","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-8545219","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-8545219","identity":"rs-8545219","version":["v1"]},"buildId":"XKTyCvWXoU3ODBz1xrDgd","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}