International Journal of Prosthodontics and Restorative Dentistry

Register      Login

VOLUME 9 , ISSUE 1 ( January-March, 2019 ) > List of Articles

Original Article

Effect of Low Power Magnification on Total Occlusal Convergence Angles in Crown Preparation

Abdulrahman Almalki, Sultan Almalki, Tushar Bahgat

Keywords : Crown, Fixed prosthodontics, Magnification, Total occlusal convergence angles

Citation Information : Almalki A, Almalki S, Bahgat T. Effect of Low Power Magnification on Total Occlusal Convergence Angles in Crown Preparation. Int J Prosthodont Restor Dent 2019; 9 (1):13-17.

DOI: 10.5005/jp-journals-10019-1225

License: CC BY-NC 4.0

Published Online: 01-12-2011

Copyright Statement:  Copyright © 2019; The Author(s).


Abstract

Purpose: The purpose of this study was to compare the total occlusal convergence angles of crown prepared teeth with low-power magnifying dental loupes and without dental loupes. Materials and methods: Three different typodent maxillary teeth (incisor, premolar, and molar) were prepared with x2.5 dental loupes and other prepared without dental loupes. A total of 96 were made, 48 with dental loupes, 48 without dental loupes. Teeth were admitted for evaluation of the buccolingual and mesiodistal convergence angles of each prepared tooth with AutoCAD digital software. Results: The average buccolingual and mesiodistal total convergence angles for crown-prepared central incisors with dental loupes were 14.73 degrees and 14.94 degrees without dental loupes. In premolars were 16.18 degrees with dental loupes and 17.74 without dental loupes. In molars were 18.55 degrees with dental loupes and 19.18 without dental loupes. Conclusion: There is no statistically significant difference between crown-prepared teeth with 2.5X dental loupes and other crown-prepared teeth without dental loupes.


PDF Share
  1. Caplan SA. Magnification in dentistry. J Esthet Dent. 1990;2(1): 17-21.
  2. Mamoun JS. A rationale for the use of high-powered magnification or microscopes in general dentistry. Gen Dent. 2009;57(1):18-26.
  3. James T, Gilmour AS. Magnifying loupes in modern dental practice: an update. Dent update.2010;37(9):633-636.
  4. Maillet JP, Millar AM, Burke JM, et al. Effect of magnification loupes on dental hygiene student posture. J Dent Edu. 2008;72(1):33-44.
  5. Robinson PB, Lee JW. The use of real time video magnification for the pre-clinical teaching of crown preparations. Br Dent J. 2001;190(9):506-510.
  6. Maggio MP, Villegas H, Blatz MB. The effect of magnification loupes on the performance of preclinical dental students. Quintessence Int.2011;42(1):45-55.
  7. Leknius C, Geissberger M. The effect of magnification on the performance of fixed prosthodontic procedures. J Calif Dent Assoc.
  8. Christensen GJ. Magnification in dentistry: useful tool or another gimmick? J Am Dent Assoc.2003;134(12):1647-1650.
  9. Del Fabbro M, Taschieri S, Lodi G, et al. Magnification devices for endodontic therapy. Cochrane Database Syst Rev.2009(3):Cd005969.
  10. Friedman MJ. Magnification in a restorative dental practice: from loupes to microscopes. Compend Contin Educ Dent.2004;25(1): 53-55.
  11. Khayat BG. The use of magnification in endodontic therapy: the operating microscope. Pract Periodontics Aesthet Dent.1998;10(1):137- 144.
  12. Behle C. Photography and the operating microscope in dentistry. J Calif Dent Assoc.2001;29(10):765-771.
  13. Shillingburg HT, Hobo S, Whitsett LD, et al. Fundamentals of fixed prosthodontics. 3rd ed: Chicago: Quintessence Publishing; 1997:119- 138.
  14. Tiu J, Al-Amleh B, Waddell JN, et al. Clinical tooth preparations and associated measuring methods: a systematic review. J Prosthet Dent. 2015;113(3):175-184.
  15. Yoon SS, Cheong C, Preisser J, Jr., et al. Measurement of total occlusal convergence of 3 different tooth preparations in 4 different planes by dental students. J Prosthet Dent 2014;112(2):285-292.
  16. Rosella D, Rosella G, Brauner E, et al. A tooth preparation technique in fixed prosthodontics for students and neophyte dentists. Annali di stomatologia. 2015;6(3-4):104-109.
  17. Chan DC, Wilson AH, Jr., Barbe P, et al. Effect of preparation convergence on retention and seating discrepancy of complete veneer crowns. J Oral Rehabil. 2005;32(1):58-64.
  18. Wilson AH, Jr., Chan DC. The relationship between preparation convergence and retention of extracoronal retainers. J Prosthodont.1994;3(2):74-78.
  19. Kaufman EG, Coelho DH, Colin L. Factors influencing the retention of cemented gold castings. J Prosthet Dent.11(3):487-502.
  20. Gilboe DB, Teteruck WR. Fundamentals of extracoronal tooth preparation. Part I. Retention and resistance form. J Prosthet Dent. 1974;32(6):651-656.
  21. el-Ebrashi MK, Craig RG, Peyton FA. Experimental stress analysis of dental restorations. IV. The concept of parallelism of axial walls. J Prosthet Dent. 1969;22(3):346-353.
  22. Rosenstiel SF, Land M, Fujimoto J. Contemporary fixed prosthodontics 5th ed: Mosby Elsevier; 2006.
  23. Park E, Chehroudi B, Coil JM. Identification of possible factors impacting dental students' ability to locate MB2 canals in maxillary molars. J Dent Edu. 2014;78(5):789-795.
  24. Perrin P, Neuhaus KW, Lussi A. The impact of loupes and microscopes on vision in endodontics. Int Endod J. 2014;47(5):425-429.
  25. Lussi A, Kronenberg O, Megert B. The effect of magnification on the iatrogenic damage to adjacent tooth surfaces during class II preparation. J Dent. 2003;31(4):291-296.
  26. Eichenberger M, Biner N, Amato M, et al. Effect of magnification on the precision of tooth preparation in dentistry. Oper Dent. 2018;43(5):501- 507.
  27. Valachi B, Valachi K. Preventing musculoskeletal disorders in clinical dentistry: strategies to address the mechanisms leading to musculoskeletal disorders. J Am Dent Assoc.2003;134(12):1604-1612.
  28. Sato T, Al Mutawa N, Okada D, Hasegawa S. A clinical study on abutment taper and height of full cast crown preparations. J Med Dent Sci. 1998;45(3):205-210.
  29. Nordlander J, Weir D, Stoffer W, et al. The taper of clinical preparations for fixed prosthodontics. J Prosthet Dent.1988;60(2):148-151.
  30. Smith CT, Gary JJ, Conkin JE, et al. Effective taper criterion for the full veneer crown preparation in preclinical prosthodontics. J Prosthodont.1999;8(3):196-200.
  31. Poon BK, Smales RJ. Assessment of clinical preparations for single gold and ceramometal crowns. Quintessence Int.2001;32(8): 603-610.
  32. Leempoel PJ, Lemmens PL, Snoek PA, et al. The convergence angle of tooth preparations for complete crowns. J Prosthet Dent. 1987;58(4):414-416.
  33. Kent WA, Shillingburg HT, Jr., Duncanson MG, Jr. Taper of clinical preparations for cast restorations. Quintessence Int.1988;19(5):339- 345.
  34. Noonan JE, Jr., Goldfogel MH. Convergence of the axial walls of full veneer crown preparations in a dental school environment. J Prosthet Dent.1991;66(5):706-708.
  35. Al-Omari WM, Al-Wahadni AM. Convergence angle, occlusal reduction, and finish line depth of full-crown preparations made by dental students. Quintessence Int.2004;35(4):287-293.
  36. Ayad MF, Maghrabi AA, Rosenstiel SF. Assessment of convergence angles of tooth preparations for complete crowns among dental students. J Dent.2005;33(8):633-638.
  37. Al Ali K, Al Wazzan KA, Al Amri MA et al. Assessment of convergence angle of full veneer preparations carried out by practitioners with different levels of experience. S Dent J.2009;21:37-44.
  38. Parker MH, Calverley MJ, Gardner FM, et al. New guidelines for preparation taper. J Prosthodont.1993;2(1):61-66.
  39. Goodacre CJ, Campagni WV, Aquilino SA. Tooth preparations for complete crowns: an art form based on scientific principles. J Prosthet Dentist.2001;85(4):363-376.
  40. Marghalani TY. Convergence angles of metal ceramic crowns prepared by dental students. J Prosthet Dent. 2014;112(5):1250-1256.
  41. Tran J, Dudley J, Richards L. All-ceramic crown preparations: An alternative technique. Aus Dent J.2017;62(1):65-70.
  42. Al-Dwairi ZN, Bashatwa MM, Lynch E. Assessment of posterior teeth preparations for metal-ceramic crowns. Eur J Prosthodont Restor Dent.2015;23(3):P141-P149.
  43. Tiu J, Lin T, Al-Amleh B, Waddell JN. Convergence angles and margin widths of tooth preparations by New Zealand dental students. J Prosthet Dent. 2016;116(1):74-79.
PDF Share
PDF Share

© Jaypee Brothers Medical Publishers (P) LTD.