Acta Scientific Dental Sciences (ISSN: 2581-4893)

Research Article Volume 6 Issue 8

Placement of Borders of Metal and Ceramic Copings and their Influence on Aesthetics of Crowns an in vitro study conducted on extracted premolars using spectrophotometer

Pavan TP1, K Chandrasekharan Nair2*, Divya Hegde3 and Jaykar Shetty3

1Reader, Department of Prosthodontics, KGF College of Dental Sciences and Hospital, Kolar Gold Fields, Kolar, Karnataka, India
2Professor Emeritus, Department of Prosthodontics, Sri Sankara Dental College, Akathumuri, Thiruvananthapuram, Kerala, India
3Former Professor, Department of Prosthodontics, AECS Maaruti College of Dental Sciences, Bangalore, India

*Corresponding Author: K Chandrasekharan Nair, Professor Emeritus, Department of Prosthodontics, Sri Sankara Dental College, Akathumuri, Thiruvananthapuram, Kerala, India.

Received: July 13, 2022; Published: July 29, 2022


Objectives: To find out the colour change that occurs in the metal-ceramic and all-ceramic crowns, with full collar, 1 mm and 2 mm cutbacks employed in the substructure, using spectrophotometer.

Materials and Methods: Three recently extracted maxillary premolars with no signs of damage or discoloration were mounted on an acrylic block. Color of the teeth was measured using spectrophotometer before the preparation and teeth were prepared conventionally to receive full coverage restorations. For each of the prepared tooth metal-ceramic and all ceramic (IPS Empress -lithium disilicate, Zirconia) crowns with full collar, 1 mm and 2mm cutbacks in their substructure were prepared and colour was measured using Spectrophotometer.

Results: Among the materials Zirconia showed the maximum colour change and among the collars full collar showed the highest colour change.

Conclusions: 1. Among the materials higher colour changes were recorded with Zirconia followed by IPS-Empress, and metal ceramic. 2. Among the three collars, higher colour changes were recorded with full collar, followed by 2mm cut back and 1 mm cut back. 3. Among all-ceramic crowns IPS Empress crowns showed less change in colour than the Zirconia. 4. Amongst the three types of crowns fabricated, zirconia exhibited higher change in colour than IPS Empress and metal-ceramic. 5.Presence of a full collar in the metal-ceramic crowns, IPS Empress and zirconia crowns can cause colour change. To obtain colour match it is desirable to employ cutback preferably of 2 mm.


Keywords: Metal Ceramic Crowns; Zirconia; IPS Empress Crowns; Cutback; Spectrophotometer


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Citation: K Chandrasekharan Nair., et al. “Placement of Borders of Metal and Ceramic Copings and their Influence on Aesthetics of Crowns an in vitro study conducted on extracted premolars using spectrophotometer". Acta Scientific Dental Sciences 6.8 (2022): 125-134d.


Copyright: © 2022 K Chandrasekharan Nair., et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


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