Original scientific paper
https://doi.org/10.15644/asc58/2/2
Clinical Survival of Reduced-Thickness Monolithic LithiumDisilicate Crowns: A 3-Year Randomized Controlled Trial
Davor Špehar
; Private Dental Office, Trg kralja Tomislava 3, Bjelovar, Croatia
Marko Jakovac
; Professor, Department of Fixed Prosthodontics, School of Dental Medicine, University of Zagreb, Gundulićeva 5, Zagreb, Croatia
Abstract
Objectives: The aim of this randomized controlled trial was to see if the minimally invasive approach
(reduced restoration thickness) would result in good clinical success of monolithic ceramic crowns
compared to conventional layered all-ceramic crowns, and thus be an alternative to conventional
tooth preparation. Materials and methods: The ceramic that was investigated was IPS e.max lithium-disilicate ceramic produced using two different processing methods. A comparison was made between monolithic crowns with reduced thickness and standard layered crowns. Fifty-two patients, who had undergone endodontic treatment on either a premolar or molar, were randomly assigned into two groups. The teeth intended for layered crowns underwent to a 2 mm occlusal reduction with a 1 mm rounded shoulder, whereas the teeth intended for monolithic crowns underwent to a 1 mm reduction in the occlusal area with a 0.6 mm rounded shoulder. The clinical success was evaluated in eight categories using modified United States Public Health Service (USPHS) criteria. The observation period was 36 months, with control appointments every 6 months. Results: There was no significant difference in clinical success between monolithic and conventional layered crowns after 3 years.
One monolithic crown fractured while all other crowns were intact and the survival rate was 96%. All layered crowns were intact and the survival rate was 100%. Conclusion: The results of this study indicate that the minimally invasive approach can be a good alternative to conventional tooth preparation. IPS e.max lithium-disilicate ceramic demonstrated an exceptional three-year survival rate independently of the thickness of the material.
Keywords
Prosthodontic Tooth Preparation; Crowns; Lithium Compounds; Monolithic crown; Layered crown; IPS e.max; Lithiumdisilicate; Reduced thickness; Survival rate
Hrčak ID:
318088
URI
Publication date:
22.6.2024.
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