World Journal of Dentistry

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VOLUME 12 , ISSUE 2 ( March-April, 2021 ) > List of Articles

ORIGINAL RESEARCH

A Novel 20° X-ray Angle Shifter for Superimposed Canal Separation

La-ongthong Vajrabhaya, Suwanna Korsuwannawong, Piyanuch Karnasuta, Boonkanda Kaewduang, Poonnika Ratanachai, Sirikarn Aneakgerawat, San Kuntiyaratana, Witchakorn Thanakittipoom, Orachorn Thongburan

Keywords : 20° angle, Canal separation, Radiograph

Citation Information : Vajrabhaya L, Korsuwannawong S, Karnasuta P, Kaewduang B, Ratanachai P, Aneakgerawat S, Kuntiyaratana S, Thanakittipoom W, Thongburan O. A Novel 20° X-ray Angle Shifter for Superimposed Canal Separation. World J Dent 2021; 12 (2):126-130.

DOI: 10.5005/jp-journals-10015-1808

License: CC BY-NC 4.0

Published Online: 00-04-2021

Copyright Statement:  Copyright © 2021; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Aim and objective: The purpose of this study was to evaluate the efficacy and frequency of a 20° angle Shifter in separating superimposed canals on multirooted tooth radiographs. Materials and methods: Radiographs from patients with 38, 44, and 39 of two-canal maxillary premolars, three- and four-canal mandibular molars, respectively, were taken at a horizontal 20° mesial and distal shift using the Shifter. The radiographs were evaluated by two examiners using the PowerPoint program. The percentage of distinctly separated canals in both shifted radiographs was analyzed using the Chi-square test (p = 0.05). The strength of agreement between each examiner (intra and inter) was evaluated using kappa statistics (p < 0.05). Results: The percentage of acceptable radiographs using the mesial and distal shift for both examiners was similar for maxillary premolars. However, the distal and mesial shift was superior compared with the mesial and distal shift in separating the root canals in three- and four-canal mandibular molars, respectively. The strength of agreement between examiners evaluated using kappa statistics (p < 0.05) was substantial-almost perfect. Conclusion: The Shifter efficiently separates superimposed canals. The advantage of the Shifter is the precise radiograph angle taken and at the same position during the multiple steps requiring radiographs in endodontic treatment. Clinical significance: The same position of the tooth on the multiple-step radiographs in endodontics is the benefit of this novel shifter.


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  1. Sjogren U, Hagglund B, Sundqvist G, et al. Factors affecting the long-term results of endodontic treatment. J Endod 1990;16(10):498–504. DOI: 10.1016/S0099-2399(07)80180-4.
  2. Tabassum S, Khan FR. Failure of endodontic treatment: The usual suspects. Eur J Dent 2016;10(1):144–147. DOI: 10.4103/1305-7456.175682.
  3. Gargon MPJ, Chandler NP. Electronic apex locators. Int Endod J 2004;37(7):425–437. DOI: 10.1111/j.1365-2591.2004.00835.x.
  4. Gulabivala K, Opasanon A, Ng YL, et al. Root and canal morphology of Thai mandibular molars. Int Endod J 2002;35(1):56–62. DOI: 10.1046/j.1365-2591.2002.00452.x.
  5. Bulut DG, Kose E, Ozcan G, et al. Evaluation of root morphology and root canal configuration of premolars in the Turkish individuals using cone beam computed tomography. Eur J Dent 2015;9(4):551–557. DOI: 10.4103/1305-7456.172624.
  6. Goerig AC, Neaverth EJ. A simplified look at the buccal object rule in endodontics. J Endod. 1987;13(12):570–572. DOI: 10.1016/s0099-2399(87)80008-0.
  7. Vajrabhaya L, Karnasuta P, Korsuwannawong S, et al. Evaluation of 20 degree shifted radiographs in endodontic treatment. J Dent Associat Thailand 2018;68(3):249–255. DOI: 10.14456/jdat.2018.30.
  8. Haghani J, Raoof M, Pourahmadi S. Ex-vivo evaluation of X-ray horizontal angle for separating the canals of four-canal first mandibular molars. Iran Endod J 2008;2(4):143–146. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3834632/pdf/iej-02-143.pdf/?tool=EBI.
  9. Klein RM, Blake SA, Nattress BR, et al. Evaluation of X-ray beam angulation for successful twin canal identification in mandibular incisors. Int Endod J 1997;30(1):58–63. DOI: 10.1111/j.1365-2591.1997.tb01099.x.
  10. Zhang LD, Chen XW, He Y, et al. Evaluation of X-ray beam angulation for successful four canals identification in the mandibular first molars. Shanghai Kou Qiang Yi Xue 2010;19(4):354–358. https://pubmed.ncbi.nlm.nih.gov/20871950/.
  11. Landis JR, Koch GG. The measurement of observer agreement for categorical data. Biometrics 1977;33(1):159–174. DOI: 10.2307/2529310.
  12. Walton RE. Endodontic radiographic technics. Dent Radiogr Photogr 1973;46(3):51–59. https://pubmed.ncbi.nlm.nih.gov/4517157/.
  13. Martinez-Lozano MA, Forner-Navarro L, Sanchez-Cortes JL. Analysis of radiologic factors in determining premolar root canal systems. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 1999;88(6):719–722. DOI: 10.1016/s1079-2104(99)70016-8.
  14. Wang Q, Yu G, Zhou XD, et al. Evaluation of X-ray projection angulation for successful radix entomolaris diagnosis in mandibular first molars in vitro. J Endod 2011;37(8):1063–1068. DOI: 10.1016/j.joen.2011.05.017.
  15. Farman AG. ALARA still applies. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2005;100(4):395–397. DOI: 10.1016/j.tripleo.2005.05.055.
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