Article (Scientific journals)
Clinical behavior of second-generation zirconia monolithic posterior restorations: Two-year results of a prospective study with Ex vivo analyses including patients with clinical signs of bruxism.
KOENIG, Vinciane; Wulfman, Claudine; BEKAERT, Sandrine et al.
2019In Journal of Dentistry, 91, p. 103229
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Keywords :
Computer-Aided design/Computer-Aided manufacturing; Dental prosthesis; Wear; Zirconia
Abstract :
[en] OBJECTIVES: This study aimed to investigate (1) clinical outcomes of second-generation zirconia restorations, including patients with bruxism clinical signs, and (2) the material wear process. METHODS: A total of 95 posterior monolithic zirconia tooth-elements in 45 patients were evaluated, 85 on implants and 10 on natural teeth, and 20.3% of restorations being fixed partial dentures (FPDs). Occlusal contact point areas were determined and half of those areas were left unglazed and just polished. Restorations were clinically evaluated following criteria of the World Dental Federation and antagonistic teeth were examined at each evaluation time. Wear ex vivo analyses using SEM and 3D laser profilometry were performed at baseline and after 6 months, 1year, and 2 years respectively, temporarily removing the prostheses. RESULTS: The Kaplan-Meier survival rate of restorations was 93.3% (100% for FPDs) and the success rate was 81.8%, with 4 abutment debondings, 3 tooth-supported crown debondings (provisional cement use), 1 restoration fracture, 1minor chipping, 1 core fracture, 1 root fracture, and 2 implant losses. 80% of catastrophic failures occurred in patients with clinical signs of bruxism (61.7% of patients). Complications were also observed on antagonistic teeth (3 catastrophic failures). Clinical evaluation of the restorations showed good results from the aesthetic, functional, and biological perspective. Zirconia wear was inferior to 15mum, while glaze wear was observed on all occlusal contact areas after 1year. CONCLUSIONS: Monolithic zirconia FPDs are promising but the failure rate of single-unit restorations was not as high as expected in this sample including patients with bruxism clinical signs. CLINICAL SIGNIFICANCE: Within study limitations, FPDs showed excellent short-term results but further research is needed for single-unit restorations considering samples, which do not exclude bruxers. The weak link is the restoration support or the antagonist tooth, one hypothesis being that zirconia stiffness and lack of resilience do not promote occlusal stress damping.
Research center :
d‐BRU - Dental Biomaterials Research Unit - ULiège [BE]
Disciplines :
Dentistry & oral medicine
Author, co-author :
KOENIG, Vinciane ;  Centre Hospitalier Universitaire de Liège - CHU > Département de dentisterie > Service prothèse fixée
Wulfman, Claudine
BEKAERT, Sandrine ;  Centre Hospitalier Universitaire de Liège - CHU > Département de dentisterie > Service prothèse fixée
DUPONT, Nathalie ;  Centre Hospitalier Universitaire de Liège - CHU > Département de dentisterie > Service prothèse fixée
Le Goff, Stéphane;  Université Paris Descartes
Eldafrawy, Maher ;  Université de Liège - ULiège > Doct. sc. dent. (paysage)
Vanheusden, Alain ;  Université de Liège - ULiège > Département de sciences dentaires > Prothèse dentaire fixe - Anatomie bucco-dentaire
Mainjot, Amélie  ;  Université de Liège - ULiège > Département de sciences dentaires > Biomatériaux dentaires
Language :
English
Title :
Clinical behavior of second-generation zirconia monolithic posterior restorations: Two-year results of a prospective study with Ex vivo analyses including patients with clinical signs of bruxism.
Publication date :
2019
Journal title :
Journal of Dentistry
ISSN :
0300-5712
eISSN :
1879-176X
Publisher :
Elsevier, Netherlands
Volume :
91
Pages :
103229
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
Copyright (c) 2019 Elsevier Ltd. All rights reserved.
Available on ORBi :
since 14 December 2019

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