Accelerated fatigue resistance and color stability of endodontically treated bleached maxillary incisors restored with and without a post.
Int J Esthet Dent
; 18(1): 26-37, 2023 Feb 03.
Article
em En
| MEDLINE
| ID: mdl-36734423
ABSTRACT
PURPOSE:
The present study aimed to assess fatigue resistance and color modifications of endodontically treated incisors (ETIs) submitted to internal bleaching and restored using three different techniques. MATERIALS ANDMETHODS:
Forty-five maxillary central incisors received endodontic treatment and were internally bleached. After the completion of bleaching, the ETIs were divided into three groups (n = 15) according to the different restoration procedures 1) glass-ionomer cement base covered with composite resin (GI); 2) short fiber-reinforced composite resin base with composite resin (SF); 3) composite resin restoration over a fiberglass post (FP). Specimens were subjected to accelerated fatigue testing frequency of 5 Hz, beginning with a load of 100 N for 5000 cycles and a 25-N load increase applied every 1700 cycles until a load of 1200 N was reached. Samples were loaded until fracture. The Kaplan-Meier survival analysis with the log-rank post hoc test were performed (α = 0.05). Tooth color was measured 4 weeks after the bleaching treatment and again after the final restoration procedure using a spectrophotometer and the Commission Internationale de l'Eclairage (CIE) L*a*b* system. L* values of the specimens were analyzed using the Shapiro-Wilk and paired sample t tests (α = 0.05).RESULTS:
All groups showed similar survival mean cycles until failure (P = 0.332) and presented a major number of nonrestorable failures. The GI group presented the lowest number of nonrepairable fractures (GI = 68%, SF = 79%, FP = 86%) and showed the most stable L* value (P = 0.987).CONCLUSIONS:
The fatigue survival of internally bleached ETIs was not affected by the restorative technique utilized. Retaining the glass-ionomer base and covering the surface with composite resin should provide optimal color stability.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fraturas dos Dentes
/
Técnica para Retentor Intrarradicular
/
Dente não Vital
Limite:
Humans
Idioma:
En
Revista:
Int J Esthet Dent
Ano de publicação:
2023
Tipo de documento:
Article