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VOLUME 22 , ISSUE 8 ( August, 2021 ) > List of Articles

CLINICAL TECHNIQUE

A Digital Chairside Technique for an Accurate Evaluation of the Taper of the Prepared Teeth for the Restoration of Crowns and Fixed Partial Dentures

Anubhav Koul, Hima B Lanka, Thomas Christy Bobby, Rashmi B Mandokar, Gayathri Devi Sultanpete Krishnappa

Keywords : Abutments, Chairside, Digital technique, Fixed partial denture, Retention, Taper

Citation Information : Koul A, Lanka HB, Bobby TC, Mandokar RB, Krishnappa GD. A Digital Chairside Technique for an Accurate Evaluation of the Taper of the Prepared Teeth for the Restoration of Crowns and Fixed Partial Dentures. J Contemp Dent Pract 2021; 22 (8):969-972.

DOI: 10.5005/jp-journals-10024-3164

License: CC BY-NC 4.0

Published Online: 09-11-2021

Copyright Statement:  Copyright © 2021; The Author(s).


Abstract

Aim: The aim of the article was to provide a digital chairside method for the objective evaluation of the taper of prepared abutment teeth retaining a fixed partial denture (FPD). Background: According to research, the taper of the abutment teeth supporting an FPD has a direct effect on both retention and stress transmission to the abutment teeth. However, no approaches have been documented in the literature that objectively quantify the taper of the prepared teeth chairside, in a simple and cost-effective manner. Technique: The proposed technique utilized an intraoral camera with an on-the-go (OTG) connection, and a silicone dental bite block. The images of the prepared teeth were captured using this camera from the facial aspect. An indigenous program was developed using the MATLAB (Matrix Laboratory 2013) software for the analysis of the images and the taper of each abutment tooth was calculated in degrees using the software. Conclusion: The novel, chairside, digital technique utilizes an intraoral camera and a computer-generated software package to quantify and evaluate the taper of abutment teeth efficiently. This, in turn, can help minimize the errors in the treatment of FPD and improve the retention of the prosthesis. Clinical significance: The current technique enables the clinician to avoid over-preparation of the abutment teeth by assessing its taper chairside. This digital technique can be a beneficial alternative to the existing procedures for an accurate assessment of taper, especially for the inexperienced operator. Hence, the quality of retention, and thereby the long-term success of the crowns and FPDs, can be enhanced.


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  1. Shillingburg HT, Hobo S, Whitsett LD, et al. Principles of tooth preparation. In: Fundamentals of fixed prosthodontics. 3rd ed. Chicago: Quintessence; 1997. p. 119–137.
  2. Blair FM, Wassell RW, Steele JG. Crowns and other extra-coronal restorations: preparations for full veneer crowns. Br Dent J 2002;192(10):561–564, 567. DOI: 10.1038/sj.bdj.4801428.
  3. Willey RL. Retention in the preparation of teeth for cast restorations. J Prosthet Dent 1976;35(5):526–531. DOI: 10.1016/0022-3913(76)90046-9.
  4. Vinnakota DN. Effect of preparation convergence on retention of multiple unit restorations: an in vitro study. Contemp Clin Dent 2015;6(3):409–413. DOI: 10.4103/0976-237x.161904.
  5. Gold HO. Instrumentation for solving abutment parallelism problems in fixed prosthodontics. J Prosthet Dent 1985;53(2):172–179. DOI: 10.1016/0022-3913(85)90103-9.
  6. Goodacre CJ, Campagni WV, Aquilino SA. Tooth preparations for complete crowns: an art form based on scientific principles. J Prosthet Dent 2001;85(4):363–376. DOI: 10.1067/mpr.2001.114685.
  7. Chandra Shekar S, Giridhar K, Suhas Rao K. An in vitro study to evaluate the retention of complete crowns prepared with five different tapers and luted with two different cements. J Indian Prosthodont Soc 2010;10(2):89–95. DOI: 10.1007/s13191- 010-0017-x.
  8. Zidan O, Ferguson GC. The retention of complete crowns prepared with three different tapers and luted with four different cements. J Prosthet Dent 2003;89(6):565–571. DOI: 10.1016/S0022-3913(03)00182-3.
  9. Gerami-Panah F, Mir S, Rezaee M, et al. Effect of taper on stress distribution of all ceramic fixed partial dentures: a 3D-FEA study. J Dent Tehran Univ Med Sci 2005;2(3).
  10. Muruppel AM, Nair D, Thomas J, et al. Assessment of retention and resistance form of tooth preparations for all ceramic restorations using digital imaging technique. J Contemp Dent Pract 2018;19(2):143–149. DOI: 10.5005/jp-journals-10024-2228.
  11. The glossary of prosthodontic terms. J Prosthet Dent 2017;117(5):e1–e105. DOI: 10.1016/j.prosdent.2016.12.001.
  12. Jorgetisen KD. The relationship between retention and convergence angle in cemented veneer crowns. Acta Odontol Scand 1955;13(1): 35–40. DOI: 10.3109/00016355509028171.
  13. 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. PMID: 15119714.
  14. Patil PG, Parkhedkar RD. Dental periscope: a new device to examine the parallelism of abutment teeth. J Indian Prosthodont Soc 2008;8:27–29. DOI: 10.4103/0972-4052.43250.
  15. Nordlander J, Weir D, Stoffer W, et al. The taper of clinical preparations for fixed prosthodontics. J Prosthet Dent 1988;60(2):148–151. DOI: 10.1016/0022-3913(88)90304-6.
  16. Farah RI. A chair-side technique to verify the parallelism of fixed partial denture abutments. Int J Prosthod Restor Dent 2016;6(1):21–23. DOI: 10.5005/jp-journals-10019-1148.
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