{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T11:13:27Z","timestamp":1789038807034,"version":"build-2803163510"},"reference-count":18,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T00:00:00Z","timestamp":1788998400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Reports"],"abstract":"<jats:p>Background and Clinical Significance: In two-stage implant treatment the cover screw must be removed at second-stage surgery. Removal is occasionally prevented by cold welding or seizure. When the drive slot is damaged by escalating torque, no standard salvage protocol has been established, and the implant body itself may ultimately require removal. Case Presentation: During second-stage surgery for three implants placed in the mandibular right posterior region (#44, #45, #46) of a 68-year-old man, the cover screw at the #46 site was seized and could not be loosened with a manual screwdriver. An attempt at removal with a contra-angle implant driver, set first to 20 Ncm and then to 35 Ncm, stripped the drive slot. The procedure was suspended, and a revision was performed two weeks later. A tungsten carbide bur was used under water irrigation to prepare a straight slot across the damaged screw head, and a crown remover with a narrowed flat-blade tip was engaged in this slot. The screw was retrieved intact and the internal connection of the implant remained serviceable. A healing abutment was connected and the implant was restored with a definitive prosthesis, which was in function at the most recent review. At seven weeks after delivery, the distance from the implant platform to the crestal bone was greater at #46 than at the two adjacent implants. Conclusions: This report describes a salvage technique that preserved the implant body without the use of a system-specific retrieval kit. The peri-implant bone level observed at the treated site indicates that the procedure may have been accompanied by a loss of crestal bone, and whether the technique is reproducible will require further cases.<\/jats:p>","DOI":"10.3390\/reports9030304","type":"journal-article","created":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T10:27:21Z","timestamp":1789036041000},"page":"304","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Stepwise Technique for Retrieval of a Seized and Stripped Dental Implant Cover Screw: A Case Report"],"prefix":"10.3390","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6130-1259","authenticated-orcid":false,"given":"Keisuke","family":"Seki","sequence":"first","affiliation":[{"name":"Implant Dentistry, Nihon University School of Dentistry Dental Hospital, Tokyo 101-8310, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kenji","family":"Ito","sequence":"additional","affiliation":[{"name":"Department of Partial Denture Prosthodontics, Nihon University School of Dentistry, Tokyo 101-8310, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Juntaro","family":"Sanada","sequence":"additional","affiliation":[{"name":"Department of Partial Denture Prosthodontics, Nihon University School of Dentistry, Tokyo 101-8310, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Taiki","family":"Akiyama","sequence":"additional","affiliation":[{"name":"Department of Comprehensive Dentistry and Clinical Education, Nihon University School of Dentistry, Tokyo 101-8310, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yoshiyuki","family":"Hagiwara","sequence":"additional","affiliation":[{"name":"Implant Dentistry, Nihon University School of Dentistry Dental Hospital, Tokyo 101-8310, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"733","DOI":"10.1111\/jcpe.12898","article-title":"A retrospective study of 30,959 implants: Risk factors associated with early and late implant loss","volume":"45","author":"Lin","year":"2018","journal-title":"J. Clin. Periodontol."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1257","DOI":"10.14219\/jada.archive.2010.0054","article-title":"Outcomes of one-stage versus two-stage implant placement","volume":"141","author":"Byrne","year":"2010","journal-title":"J. Am. Dent. Assoc."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"493","DOI":"10.1016\/j.ijom.2014.11.011","article-title":"Immediately loaded non-submerged versus delayed loaded submerged dental implants: A meta-analysis","volume":"44","author":"Chrcanovic","year":"2015","journal-title":"Int. J. Oral Maxillofac. Surg."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"97","DOI":"10.1111\/j.1600-0501.2007.01439.x","article-title":"Comparison of survival and complication rates of tooth-supported fixed dental prostheses (FDPs) and implant-supported FDPs and single crowns (SCs)","volume":"18","author":"Pjetursson","year":"2007","journal-title":"Clin. Oral Implants Res."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"66","DOI":"10.4103\/jdi.jdi_1_18","article-title":"Cold welding: A possible mechanical complication related to a failing dental implant cover screw","volume":"8","author":"Jancsik","year":"2018","journal-title":"J. Dent. Implants"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1854","DOI":"10.1002\/ccr3.2375","article-title":"A novel technique to retrieve cold-welded implant abutment: A case series","volume":"7","author":"Arshad","year":"2019","journal-title":"Clin. Case Rep."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1388","DOI":"10.1016\/j.jhsa.2012.04.027","article-title":"Titanium integration with bone, welding, and screw head destruction complicating hardware removal of the distal radius","volume":"37","author":"Yao","year":"2012","journal-title":"J. Hand Surg. Am."},{"key":"ref_8","first-page":"2642","article-title":"A technique elucidating the retrieval of an adhered cover screw in a dental implant: A case report","volume":"7","author":"Bhuvaneswarri","year":"2013","journal-title":"J. Clin. Diagn. Res."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"287","DOI":"10.4103\/jispcd.JISPCD_318_21","article-title":"Retrieval of fractured implant abutment screws: A narrative review","volume":"12","author":"Nayana","year":"2022","journal-title":"J. Int. Soc. Prev. Community Dent."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Shiers-Gelalis, F., Matthews, H., Rodham, P., Giannoudis, V.P., and Giannoudis, P.V. (2025). Systematic review of incidence of cold-welding phenomenon in use of implants for fracture fixation and collation of removal techniques. J. Clin. Med., 14.","DOI":"10.3390\/jcm14134564"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"218","DOI":"10.1016\/j.jclinepi.2017.04.026","article-title":"CARE guidelines for case reports: Explanation and elaboration document","volume":"89","author":"Riley","year":"2017","journal-title":"J. Clin. Epidemiol."},{"key":"ref_12","unstructured":"(2017). Standard Specification for Unalloyed Titanium, for Surgical Implant Applications (UNS R50250, UNS R50400, UNS R50550, UNS R50700) (Standard No. ASTM F67-13(2017))."},{"key":"ref_13","unstructured":"Br\u00e5nemark, P.-I., Zarb, G.A., and Albrektsson, T. (1985). Patient selection and preparation. Tissue-Integrated Prostheses: Osseointegration in Clinical Dentistry, Quintessence."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"306","DOI":"10.1016\/j.jobcr.2023.02.009","article-title":"Mechanical failures of dental implants and supported prostheses: A systematic review","volume":"13","author":"Verma","year":"2023","journal-title":"J. Oral Biol. Craniofac. Res."},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Manfredini, M., Poli, P.P., Giboli, L., Beretta, M., Maiorana, C., and Pellegrini, M. (2024). Clinical factors on dental implant fractures: A systematic review. Dent. J., 12.","DOI":"10.3390\/dj12070200"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"4198","DOI":"10.6026\/973206300214198","article-title":"In vitro study on the mechanical strength of abutment screw head under compressive forces","volume":"21","author":"Chaudhary","year":"2025","journal-title":"Bioinformation"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"1404","DOI":"10.1080\/00140130701393775","article-title":"Evaluation of handle design characteristics in a maximum screwdriving torque task","volume":"50","author":"Kong","year":"2007","journal-title":"Ergonomics"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"32","DOI":"10.1186\/s40729-020-00231-9","article-title":"Influence of antihypertensive medications on the clinical parameters of anodized dental implants: A retrospective cohort study","volume":"6","author":"Seki","year":"2020","journal-title":"Int. J. Implant Dent."}],"container-title":["Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2571-841X\/9\/3\/304\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T10:57:01Z","timestamp":1789037821000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2571-841X\/9\/3\/304"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,9,10]]},"references-count":18,"journal-issue":{"issue":"3","published-online":{"date-parts":[[2026,9]]}},"alternative-id":["reports9030304"],"URL":"https:\/\/doi.org\/10.3390\/reports9030304","relation":{},"ISSN":["2571-841X"],"issn-type":[{"value":"2571-841X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,9,10]]}}}