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Current Strategy for Successful Periradicular Surgery Tamotsu Tsurumachi1,2)

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Current Strategy for Successful Periradicular Surgery Tamotsu Tsurumachi1,2) 267 Journal of Oral Science, Vol. 55, No. 4, 267-273, 2013 Review Current strategy for successful periradicular surgery Tamotsu Tsurumachi1,2) 1)Department of Endodontics, Nihon University School of Dentistry, Tokyo, Japan 2)Division of Advanced Dental Treatment, Dental Research Center, Nihon University School of Dentistry, Tokyo, Japan (Received September 30, 2013; Accepted November 21, 2013) Abstract: Periradicular surgery is often used as a tions in techniques and instruments have contributed to last resort to save an endodontically treated tooth the development of endodontic surgery (3-5). with a persistent periapical lesion. The introduction One treatment option in endodontic surgery is peri- of surgical microscopes, ultrasonics, and compatible radicular surgery, which includes four critical steps to root-end filling materials has made periradicular eliminate persistent endodontic pathogens: 1) surgical surgery a much more predictable treatment. The removal of the periapical lesion, 2) root-end resection, advantages of modern periradicular surgery 3) root-end cavity preparation, and 4) root-end filling include easier identification of root apices, smaller (6). The main objectives of periradicular surgery and osteotomines, shallower resection angles, and tight conventional root canal therapy are the same—to provide sealing within the prepared root-end cavity. Modern conditions that facilitate healing and repair of periapical periradicular surgical thus has a much higher success tissue. These conditions are created by removing necrotic rate than traditional periradicular surgery. tissue and tissue breakdown products from the apical root (J Oral Sci 55, 267-273, 2013) canal system, eliminating bacterial organisms in the root canal system, and sealing the root canal. The relevant Keywords: endodontic surgery; periapical lesion; peri- clinical factors in deciding to perform periradicular radicular surgery; root-end filling; root-end surgery have been classified as technical, biological, and resection; root-end cavity preparation. a combination of these (7). Technical factors include the presence of a crown, post, and/or broken instruments that may prevent access to the infected root canal. Previously, Introduction root canal therapy through such a restoration was not In cases of endodontic failure, non-surgical endodontic recommended, as it was considered risky and believed retreatment or endodontic surgery is indicated. Non- to be associated with poor outcomes. When removal surgical endodontic retreatment is generally considered of restorations was not practical, periradicular surgery the treatment of choice. Endodontic surgery should be became the last resort for salvaging the affected tooth restricted to cases in which a non-surgical approach (Fig. 1). is impossible or has failed (1,2). Recent advances in This review summarizes the available literature on endodontic surgery have enabled practitioners to save periradicular surgery and recommends management teeth that would have been extracted previously. Innova- strategies based on the latest research. Do surgery and endodontic retreatment Correspondence to Dr. Tamotsu Tsurumachi, Department of have the same indications? Endodontics, Nihon University School of Dentistry, 1-8-13 Surgical endodontics is an important part of endodontic Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8310, Japan Fax: +81-3-3219-8348 practice. Periradicular surgery may be performed after E-mail: [email protected] unsuccessful endodontic retreatment or when orthograde doi.org/10.2334/josnusd.55.267 retreatment is contraindicated (1,2). When an improper DN/JST.JSTAGE/josnusd/55.267 or defective root canal filling is the cause of endodontic 268 A B C D E F Fig. 1 Traditional periradicular surgery. (A) Clinical view of maxillary left lateral incisor. (B) Preoperative radiograph showing post, poor root canal filling, and periapical radiolucency. (C) Intraoperative view after root-end resection and root-end filling with gutta- percha. (D) Radiograph immediately after periradicular surgery. (E) Two-year follow-up radiograph showing that the periapical lesion is smaller. (F) Four-year follow-up radiograph showing excellent periapical healing. Reproduced from Tsurumachi T. The Quintessence (2009) 28, 1357-1359. failure, and the root canal is coronally accessible and Periapical radiographs are used clinically to diagnose negotiable, surgical treatment is not considered the treat- apical periodontitis. Successful treatment is defined as ment of choice (8). The success rate for periradicular absence of symptoms and periapical radiolucency after surgery is lower than that of root canal retreatment. treatment. Posttreatment disease is diagnosed when a Previous studies reported a success rate of between periapical radiolucency remains at 4 years after treatment 50-90% for periradicular surgery, which is not higher (14). For some time, absence of a periapical radiolu- than that for conventional root canal treatment (9-12). cency on a periapical radiograph was used to confirm a Furthermore, any periradicular surgery will be of little healthy periapex. However, a periapical radiograph is a value for teeth with poorly condensed filling or untreated two-dimensional aspect of a three-dimensional structure root canals. In such cases, the surgical procedure will (15). Periapical lesions confined within cancellous bone simply transfer the apical foramen to a more coronal are usually not detected (15-18). Cone-beam computed position, creating an open apex that will predispose the tomography (CBCT) scans were able to detect periapical tooth to new or recurrent infection. Therefore, endodontic lesions in many cases in which a periapical radiolucency retreatment is recommended over periradicular surgery was absent in a periapical radiograph (19-22). The unless non-surgical retreatment is not possible or the absence of a radiolucency on a periapical radiograph risks of retreatment are excessive (13). does not guarantee a healthy periapex, and a CBCT scan may thus be better for diagnosis (23-26). When a surgical Clinical and radiographic evaluation approach is chosen, it is essential to know the precise Routine clinical examination procedures are used to extent of the apical lesion and its relation to the root and evaluate signs and symptoms such as loss of function, neighboring structures. For treatment planning in peri- tenderness to percussion or palpation, subjective discom- radicular surgery, CBCT provides additional beneficial fort, mobility, sinus tract formation, signs of infection or information not available from two-dimensional radio- swelling, and periodontal pocket formation. graphs. 269 A B C D E F Fig. 2 Modern periradicular surgery using an M651 surgical microscope (Leica). (A) Preoperative view of maxillary right central and lateral incisors. Note swelling with the sinus tract. (B) Preoperative radiograph of lateral incisor showing a separated instrument and periapical radiolucency. The lesions in the maxillary central and lateral incisors were treated by periradicular surgery. (C) Intraoperative view after root-end resection and root-end filling with MTA. (D) Postoperative radiograph at completion of periradicular surgery. (E) One-year follow-up radiograph showing that the periapical lesion is smaller. (F) Two-year follow-up radiograph showing excellent periapical healing. Success and failure requirements in achieving a predictable outcome after A thorough history, clinical examination, and good-quality periradicular surgery (5,33). Periradicular surgery can periapical radiographs are essential in preoperative and be performed using traditional or modern techniques. postoperative assessment of teeth selected for periradic- Traditional periradicular surgery included root-end ular surgery. Evaluation of the outcome of periradicular resection with a 45° bevel angle and root-end cavity surgery is mostly based on clinical and radiographic preparation using a carbide round bur. The introduction criteria for healing of periapical tissues (27,28). The of surgical microscopes, ultrasonics, and compatible healing classification is as follows: 1) complete healing root-end filling materials has made modern periradicular as defined by re-establishment of the lamina dura, 2) surgery more predictable, and success rates are now high incomplete healing, 3) uncertain healing, and 4) unsatis- (34-36). Current microsurgical techniques permit precise factory healing (4,10,29-32). The criteria for a successful performance of endodontic surgical procedures, thus outcome include absence of clinical signs or symptoms, eliminating the disadvantages of traditional periradicular and radiographic evidence, of complete or incomplete surgery (Fig. 2). US studies show that the use of a dental healing. The criteria for failure include clinical signs or microscope among endodontists has increased from 52% symptoms, and radiographic evidence, of uncertain or in 1999 (37) to 90% in 2007 (38). unsatisfactory healing. Flap designs Modern surgical procedures Various flap designs are described in the literature Periradicular surgery includes surgical debridement (39-42). Flap design affects access, visibility, anatomical of pathologic periapical tissue, root-end resection, structures, repositioning, suturing, postoperative care of root-end cavity preparation, and placement of root-end the surgical site, and postoperative sequelae. If access filling to seal the root canal. Location, cleaning, and and visibility are limited by a flap
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