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Poster 229: Severe Root Resorption of the Lower Second Molar Associated With Third Molar Position
Scientific Poster Session the tip of drill and the tooth was ascertained on the screen during surgery. The depth and direction of the drill could be visualized in the CT images. The tooth was segmented with the crown and root without injuring inferior alveolar nerve. They were removed via a minimally invasive access without SSRO. Postoperative course was uneventful without inferior alveolar nerve palsy. Conclusion: Image guided surgery of the mandible is more safe and less invasive for anatomical structures than conventional methods. It can also provide reliability during the operation for surgeons. References Susarla SM, Dodson TB: Preoperative computed tomography imaging in the management of impacted mandibular third molars. J Oral Maxillofac Surg 65:83, 2007 Suarez-Cunqueiro MM, Schoen R, Schramm A, et al: Endoscopic approach to removal of an ectopic mandibular third molar. Br J Oral Maxillofac Surg 41:340, 2003. Eggers G, Muhling J, Marmulla R: Template-based registration for image-guided maxillofacial surgery. J Oral Maxillofac Surg 63:13301336, 2005
second molar, and the pulp tissue was replaced by immature or fibrous granulation tissue. Case 2: A 32-yearold man with partial eruption of a lower right third molar felt swelling and pain over a 5 month period at third molar region. The lower right third molar was inclined medially and the distal portion of the crown was visible. Probing depth on the distal of the adjacent second molar was 9mm. On the radiographs, bone resorption was evident under the third molar crown. Root resorption of second molar was detected also. The second molar was removed revealing a distal root deeply resorbed. Pulp necrosis was observed histologically. Conclusion: Although severe resorption leading to removal of the second molar is thought to be rare, assessing this potential outcome from retained impacted third molars should be included in a data based monitoring protocol yet to be developed. References Yamaoka M, Furusawa K, Ikeda M, et al: Root resorption of mandibular second molar teeth associated with the presence of the third molars. Australian Dental Journal 44: 112-116, 1999. Nance PE, White RP Jr., Offenbacher S et al: Change in third molar angulation and position in young adults and follow-up periodontal pathology. J Oral Maxillofac Surg 64: 424-428, 2006.
POSTER 229 Severe Root Resorption of the Lower Second Molar Associated With Third Molar Position Akihiko Iida, DDS, PhD, Division of Oral and Maxillofacial Surgery, Niigata University Graduate School of Medicine and Dental Sciences, 2-5274 Gakkocho, Chuo-ku Niigata, 951-8514, Japan (Takagi R; Maruyama S; Saku T; Saito I; White RP Jr.) Statement of the Problem: Severe root resorption of lower second molar is associated with third molar anatomic position. Materials and Methods: Report of 2 cases with severe root resorption of the lower second molar associated with third molar position. Method of Data Analysis: Descriptive analysis of clinical cases was used to document the association between third molar anatomic position and second molar root resorption. Results: Case 1: A 32-year-old woman reported pain at lower right third molar region 2 months prior, and was referred for evaluation. The lower right third molar was unerupted. A 6mm probing depth was evident on the distal of the second molar. On the radiographs, the lower right third molar was inclined medially, and the medial part of the crown was superimposed on the root of second molar. The deep resorption of distal root of lower second molar was observed. We removed second molar and the third molar was repositioned orthodontically. Root resorption extended to pulp cavity of the AAOMS • 2007
POSTER 230 Development of New Ultrasonic Probe for Intraoral Use With Improvements for Differential Diagnosis on Oral Disease Koichi Matsumoto, DDS, 1830-1 Yoshioka, YotsukaidoCity, Chiba, 284-0032, Japan (Matsumoto K; Shinozaki Y; Osano H; Jinbu Y; Taniguchi N; Kusama M) Statement of the Problem: A new probe was devised to improve the diagnostic and operative ability. This probe consisted mainly of a cubic column with straight cable inside and a scanning element. The prolonged column was useful for griping and handling at our discretion. The scanning component enabled clinicians to recognize a precise appearance of the impaired lesions. The outer surface of this probe was covered with hard cuboid column except the searching prove including covered water bag. Materials and Methods: This element was linear type and the range of examining view was 10 mm. Scanning was performed by the pulse Doppler method to obtain color tomograms in the B mode.The prove that we have developed in this study could make close contact with the target organs by expanding water bag. Good resoluti on and clear focal distance were successfully obtained by this devised instrument. Method of Data Analysis: Precise ultrasonic analysis of internal-, marginal-, posterior-, and vascular- echoes were indispensable for the accurate diagnosis. 43.e127
second molar, and the pulp tissue was replaced by immature or fibrous granulation tissue. Case 2: A 32-yearold man with partial eruption of a lower right third molar felt swelling and pain over a 5 month period at third molar region. The lower right third molar was inclined medially and the distal portion of the crown was visible. Probing depth on the distal of the adjacent second molar was 9mm. On the radiographs, bone resorption was evident under the third molar crown. Root resorption of second molar was detected also. The second molar was removed revealing a distal root deeply resorbed. Pulp necrosis was observed histologically. Conclusion: Although severe resorption leading to removal of the second molar is thought to be rare, assessing this potential outcome from retained impacted third molars should be included in a data based monitoring protocol yet to be developed. References Yamaoka M, Furusawa K, Ikeda M, et al: Root resorption of mandibular second molar teeth associated with the presence of the third molars. Australian Dental Journal 44: 112-116, 1999. Nance PE, White RP Jr., Offenbacher S et al: Change in third molar angulation and position in young adults and follow-up periodontal pathology. J Oral Maxillofac Surg 64: 424-428, 2006.
POSTER 229 Severe Root Resorption of the Lower Second Molar Associated With Third Molar Position Akihiko Iida, DDS, PhD, Division of Oral and Maxillofacial Surgery, Niigata University Graduate School of Medicine and Dental Sciences, 2-5274 Gakkocho, Chuo-ku Niigata, 951-8514, Japan (Takagi R; Maruyama S; Saku T; Saito I; White RP Jr.) Statement of the Problem: Severe root resorption of lower second molar is associated with third molar anatomic position. Materials and Methods: Report of 2 cases with severe root resorption of the lower second molar associated with third molar position. Method of Data Analysis: Descriptive analysis of clinical cases was used to document the association between third molar anatomic position and second molar root resorption. Results: Case 1: A 32-year-old woman reported pain at lower right third molar region 2 months prior, and was referred for evaluation. The lower right third molar was unerupted. A 6mm probing depth was evident on the distal of the second molar. On the radiographs, the lower right third molar was inclined medially, and the medial part of the crown was superimposed on the root of second molar. The deep resorption of distal root of lower second molar was observed. We removed second molar and the third molar was repositioned orthodontically. Root resorption extended to pulp cavity of the AAOMS • 2007
POSTER 230 Development of New Ultrasonic Probe for Intraoral Use With Improvements for Differential Diagnosis on Oral Disease Koichi Matsumoto, DDS, 1830-1 Yoshioka, YotsukaidoCity, Chiba, 284-0032, Japan (Matsumoto K; Shinozaki Y; Osano H; Jinbu Y; Taniguchi N; Kusama M) Statement of the Problem: A new probe was devised to improve the diagnostic and operative ability. This probe consisted mainly of a cubic column with straight cable inside and a scanning element. The prolonged column was useful for griping and handling at our discretion. The scanning component enabled clinicians to recognize a precise appearance of the impaired lesions. The outer surface of this probe was covered with hard cuboid column except the searching prove including covered water bag. Materials and Methods: This element was linear type and the range of examining view was 10 mm. Scanning was performed by the pulse Doppler method to obtain color tomograms in the B mode.The prove that we have developed in this study could make close contact with the target organs by expanding water bag. Good resoluti on and clear focal distance were successfully obtained by this devised instrument. Method of Data Analysis: Precise ultrasonic analysis of internal-, marginal-, posterior-, and vascular- echoes were indispensable for the accurate diagnosis. 43.e127