Comparison between CAD-CAM and hot-press lithium disilicate crowns

Hristov, Vasko and Arlamova, Zivanka and Mitevski, Kiril and Apostoloski, Pavle (2019) Comparison between CAD-CAM and hot-press lithium disilicate crowns. In: Dental summer school & Second International Student’s Congress in Dental Medicine 2019, 23-26 May 2019, Ohrid, Macedonia.

	Text Comparison between CAD-CAM and hot-press lithium disilicate crowns.pdf Download (2MB)
	Text Comparison between CAD-CAM and hot-press lithium disilicate (ОХРИД).pdf Download (207kB)

Abstract

Hot-pressing and computer-aided design and computer-aided manufacturing (CAD-CAM) are major techniques for the
fabrication of lithium disilicate crowns. They exhibit different accuracies regarding marginal fit, an important factor in
restoration survival. However, studies comparing the marginal fit of different fabrication methods are lacking.
Purpose: The purpose of this in vitro study was to compare the marginal discrepancy (MD) and absolute marginal
discrepancy (AMD) of lithium disilicate crowns produced by the hot-press and CAD-CAM techniques.
Meterial and methods: Thirty typodont teeth were divided into 2 groups. Fifteen teeth were scanned with the CEREC
Omnicam intraoral scanner, and crowns were fabricated with the CEREC MC XL chairside CAD-CAM milling unit from IPS
e.max CAD blocks. Fifteen typodont teeth were sent to a dental laboratory, and lithium disilicate crowns were fabricated
from IPS e.max press ingots using the hot-press technique. The 30 crowns were cemented and then sectioned with a
precision saw. The MD and AMD were measured for each crown with a light microscope. One-way ANOVA was conducted
to analyze significant differences in crown marginal fit between the fabrication systems (α=.05).
Results: For the CAD-CAM technique, the mean values of the AMD measurements were 115 μm, and for the hot-press
technique, 130 μm. The MD measurements were 87 μm for the CAD-CAM technique and 90 μm for the hot-press technique.
Conclusons: No significant differences were found between the fabrication methods tested. Both the CAD-CAM and hotpress
techniques for producing monolithic lithium disilicate crowns produced MD values of less than 120 μm, within the
clinically acceptable range.

Item Type:	Conference or Workshop Item (Speech)
Subjects:	Medical and Health Sciences > Other medical sciences
Divisions:	Faculty of Medical Science
Depositing User:	Pavle Apostoloski
Date Deposited:	21 Sep 2023 08:31
Last Modified:	21 Sep 2023 08:31
URI:	https://eprints.ugd.edu.mk/id/eprint/26568

Actions (login required)

View Item