Migration of foreign bodies
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1 CASE LETTER Atraumatic Removal of an Asymptomatic Migrated Dental Implant Into the Maxillary Sinus: A Case Report Spiros Tsodoulos, DDS, MD, PhD Irene Karabouta, DDS, MD, PhD* Margarita Voulgaropoulou, DDS, MsD Christos Georgiou, DDS, MD INTRODUCTION Department of Oral and Maxillofacial Surgery, Dental School of Thessaloniki, Aristotle University of Thessaloniki, Thessaloniki, Greece. * Corresponding author, syomo@otenet.gr DOI: /AAID-JOI-D Migration of foreign bodies into the maxillary sinuses is a relatively frequent com plication in dental clinical practice. Potential ways of escape for these are penetrating trauma, an oroantral fistula or an iatrogenic displacement during dental procedures such as extractions of teeth, routine endodontic treatment, 1 apical surgery or, lately, dental implant placement. 2 Most common foreign bodies associated with sinus perforation are displaced fractured roots, whole teeth, dental impression materials, dental burs, guttapercha 3 and silver points, amalgam fillings, and dental implants. Examples of more bizarre materials are bullets, pieces of glass, stones, and wood. All of these objects may cause inflammation/sinusitis by interrupting mucociliary clearance or causing a tissue reaction. 4 It is widely recognized that prompt and conservative surgical intervention is desirable to remove these foreign bodies from paranasal sinuses but also to treat a possible hyperplastic or infected sinus mucosa. This early intervention is suggested to prevent or treat the possible sequelae of acute or chronic sinusitis, antrolith formation, mucosal cyst formation, and persistent oroantral communication. 5 Extension of infection intracranially, aspergillosis connected with zinc endodontic obstruction materials, or malignant tumors are rare complications of sinus foreign bodies and pathologic conditions. 5 Displacement of dental implants into the maxillary sinus can violate the anatomic integrity and interfere with the physiologic mechanisms of the maxillary sinus, creating potential complications, like a foreign-body reaction of conventional sinusitis. 6 The failure rate of osseointegration of dental implants is more significant to the maxilla than the mandible because of the anatomy related to the surrounding structures (such as the maxillary sinus), bone quality Class IV (thin cortical bone with spongy or low density), rapid alveolar bone resorption after tooth extraction, maxillary sinus pneumatization, and so on. 7 More precisely, due to the insufficient height of the alveolar ridge, the implants often touch or even slightly perforate the Schneiderian membrane of respiratory epithelium, which lines the floor of the antrum. 8 Moreover, inadequate implant preparation, drilling or installation errors, and Journal of Oral Implantology 189
2 Atraumatic Removal of Asymptomatic Migrated Dental Implant FIGURE 1. View of the presence of the implant into the maxillary sinus. (a) Panoramic X ray. (b) Water s X ray. (c) Computerized tomography scan. excessive tapping during sinus osteotomy procedure 4 can lead to sinus complications related to several maxillary reactions, chronic maxillary sinusitis of dental origin being the more frequent one. 9 Also, the displacement of an implant into the maxillary sinus can result in a foreign-body reaction or a sinus infection secondary to peri-implantitis, 10 or it can remain uneventful for a long period. 11 Nevertheless, cases of complete migration of dental implants into the maxillary sinus 7,9,12 or even into the sphenoid sinus 13 are rarely mentioned in the literature. 10,14 CASE REPORT A 43-year-old white man came to our private practice office with a chief complaint of a mucosal trauma on the left posterior maxillary region caused by the prosthetic rehabilitation of movable overstructure, placed and loaded on dental implants 8 years ago. A careful clinical examination showed the disappearance of an abutment on the posterior left side of the maxilla and the absence of the implant from the same area, though the housing on the overdenture was clearly seen. The conventional panoramic and Water s radiograph revealed migration of the dental implant into the left maxillary sinus, situated in an anterior position attached to the medial wall (Figure 1a and b). The radiographic evaluation was completed by a computerized tomography scan of the facial skeleton (Figure 1c). The patient presented no clinical symptoms from the sinus, like nasal congestion or discharge, facial pain or hyposmia, and no chronic oroantral fistula was observed. After obtaining the patient s consent for suggested treatment, he was treated under general anesthesia by a minimally invasive surgical technique. After the raise of an atraumatic buccal full-thickness flap and the 190 Vol. XXXVIII/No. Two/2012
3 Tsodoulos et al FIGURE 2. Intraoperative view. (a) The osseous window and the holes for its postsurgical stabilization in position. (b) The opened sinus before removal of the implant. use of round bur No. 2 to create a small rectangular osseous window (bone flap) in the anterior wall of the sinus, the implant was detected under direct vision and removed with forceps through the osseous window of the osteotomy. The bone segment (bone lid) that was removed to facilitate access to maxillary sinus was preserved, as it was repositioned at the end of the surgery, guided by small matching holes and stabilized by resorbable stitches. 15 The whole antrum cavity was carefully examined making clear the absence of granulomatous reaction tissue (Figures 2 through 4). The histologic examination showed no inflammatory signs connected to the migrated implant. The immediate and further FIGURE 3. The dental implant after removal from the maxillary sinus. postoperative recovery of the patient was uneventful and no complications occurred. Six months later 2 new osseointegrated implants were placed in the left posterior maxillary region assisted with demineralized bone graft and plasma-rich growth factor, and an overstructure was made with a successful result. DISCUSSION The pathogenesis of migration of an implant into the maxillary sinus is difficult to explain, but 3 probable mechanisms include the changes in intrasinal and nasal air pressure, an autoimmune reaction to the implant causing peri-implant bone destruction and compromising the osseointegration, and a bone resorption produced by an incorrect distribution of occlusal forces. 7 No matter the cause, implant displacement into the maxillary sinus causes chronic maxillary sinusitis due to the foreign-body reaction and needs to be treated with surgical removal of the implant, even when it is asymptomatic. 6,12 In our case, the forces acting on the implant were unclear, and the possibility of a small penetration of the floor of the antrum during the placement existed as well. Also, the duration of the hospitality of the implant is unknown. Treatment modalities for removal of a migrated dental implant initially included the conventional Caldwell-Luc (C-L) procedure, 16 Journal of Oral Implantology 191
4 Atraumatic Removal of Asymptomatic Migrated Dental Implant FIGURE 4. Postoperative X-ray films without the presence of the implant into the maxillary sinus. (a) Water s X ray. (b) Lateral X ray. and in specific situations, preservation alone. 4 Recent minimally invasive attitude in maxillofacial surgery led to transoral 17 or transnasal 18 functional endoscopic sinus surgery (FESS), 19,20 as well as the conservative intraoral approach with the creation of a bony window in the lateral wall of the sinus, 2 and the alternatives of the C-L procedure. 21 The risks of the conventional C-L procedure include infraorbital nerve injury, retraction of the soft tissues of the cheek, replacement of mucosa by scar tissue, or an oroantral fistula if the periosteum is not closed adequately, and can make subsequent implant insertion difficult. 22 FESS is a less invasive procedure as it respects the integrity of the sinus the most and permits infection control of paranasal sinuses secondarily involved, but it cannot close oroantral communications 2 and is usually inadequate to get access to dental materials dislocated anteriorly or to the bottom of the sinus. 23 Also, it has a limitation of use when the object is large or accompanied by a dental cyst, and it requires specific training and equipment. 17 In our case, the intraoral approach with the technique of bone flap (bone lid 24 ) in the anterior wall of the maxillary sinus was preferred because of the position and size of the implant and the requirement of a wide opening for the direct surgical manipulations without other mucosal disturbances. The endoscopic surgery, even though minimally invasive, was not indicated due to the restricted opening and the lower site where it was performed. 17 ABBREVIATIONS C-L: Caldwell-Luc procedure FESS: functional endoscopic sinus surgery REFERENCES 1. Yamaguchi K, Matsunaga T, Hayashi Y. Gross extrusion of endodontic obturation materials into the maxillary sinus: a case report. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2007;104: Chiapasco M, Felisati G, Maccari A, Borloni R, Gatti F, Di Leo F. The management of complications following displacement of oral implants in the paranasal sinuses: a multicenter clinical report and proposed treatment protocols. Int J Oral Maxillofac Surg. 2009;38: Ishikawa M, Mizuno T, Yamazaki Y, Satoh T, Notani K, Fukuda H. Migration of gutta-percha point from a root canal into the ethmoid sinus. Br J Oral Maxillofac Surg. 2004;42: Kluppel LE, Santos SE, Olate S, Freire Filho FW, Moreira RW, de Moraes M. Implant migration into maxillary sinus: description of two asymptomatic cases. Oral Maxillofac Surg. 2010;14: Liston PN, Walters RF. Foreign bodies in the maxillary antrum: a case report. Aust Dent J. 2002;47: Vol. XXXVIII/No. Two/2012
5 Tsodoulos et al 6. Regev E, Smith RA, Perrott DH, Pogrel MA. Maxillary sinus complications related to endosseous implants. Int J Oral Maxillofac Implants. 1995;10: Galindo P, Sánchez-Fernández E, Avila G, Cutando A, Fernandez JE. Migration of implants into the maxillary sinus: two clinical cases. Oral Maxillofac Implants. 2005;20: Jung JH, Choi BH, Jeong SM, Li J, Lee SH, Lee HJ. A retrospective study of the effects on sinus complications of exposing dental implants to the maxillary sinus cavity. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2007;103: Iida S, Tanaka N, Kogo M, Matsuya T. Migration of dental implant into the maxillary sinus. A case report. Int J Oral Maxillofac Surg. 2000;29: Ueda M, Kaneda T. Maxillary sinusitis caused by dental implant: report of two cases. J Oral Maxillofac Surg. 1992;50: Costa F, Emanuelli E, Robiony M, Zerman N, Polini F, Politi M. Endoscopic surgical treatment of chronic maxillary sinusitis of dental origin. J Oral Maxillofac Surg. 2007;65: Raghoebar GM, Vissink A. Treatment for an endosseous implant migrated into the maxillary sinus not causing maxillary sinusitis: case report. Int J Oral Maxillofac Implants. 2003;18: Felisati G, Lozza P, Chiapasco M, Borloni R. Endoscopic removal of an unusual foreign body in the sphenoid sinus: an oral implant. Clin Oral Implants Res. 2007;18: Quiney RE, Brimble E, Hodge M. Maxillary sinusitis from dental osseointegrated implants. J Laryngol Otol. 1990;104: Biglioli F, Goisis M. Access to the maxillary sinus using a bone flap on a mucosal pedicle: preliminary report. J Craniomaxillofac Surg. 2002;30: Caldwell G. Disease of the accessory sinuses of the nose and an improved method of treatment for suppuration of the maxillary antrum. NY Med J. 1893;58: Nakamura N, Mitsuyasu T, Ohishi M. Endoscopic removal of a dental implant displaced into the maxillary sinus. Int J Oral Maxillofac Surg. 2004;33: Kim JW, Lee CH, Kwon TK, Kim DK. Endoscopic removal of a dental implant through a middle meatal antrostomy. Br J Oral Maxillofac Surg. 2007;45: Kitamura A. Removal of a migrated dental implant from a maxillary sinus by transnasal endoscopy. Br J Oral Maxillofac Surg. 2007;45: Varol A, Türker N, Göker K, Basa S. Endoscopic retrieval of dental implants from the maxillary sinus. Int J Oral Maxillofac Implants. 2006;21: Flanagan D. A method to retrieve a displaced dental implant from the maxillary sinus. J Oral Implantol. 2009;35: Lubbe DE, Aniruth S, Peck T, Liebenberg S. Endoscopic transnasal removal of migrated dental implants. Br Dent J. 2008;204: Smith JL 2nd, Emko P. Management of a maxillary sinus foreign body (dental bur). Ear Nose Throat J. 2007;86: Widmark G, Ekholm S, Borrman H, Grangård U, Holmberg K. The use of a bone lid to close the anterior wall defect after surgery in the maxillary sinus. Swed Dent J. 1992;16: Journal of Oral Implantology 193
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