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- Title
Evaluation of the fracture resistance of premolars with extensive and medium cavity preparations restored with direct restoring systems.
- Authors
Pottmaier, Larissa Fernanda; de Azevedo Linhares, Ludmilla; Baratieri, Luiz Narciso; Cardoso Vieira, Luiz Clovis; Linhares, Ludmilla de Azevedo; Vieira, Luiz Clovis Cardoso
- Abstract
<bold>Context: </bold>Studies have been conducted to measure the fracture resistance of restored teeth with the current restorative materials. However, most of those studies disregard the cavity size as an influencing variable.<bold>Aims: </bold>To evaluate the fracture resistance of prepared and restored maxillary premolars with medium and large preparations.<bold>Materials and Methods: </bold>Seventy superior and sound premolars were randomly divided: G1 (control) - sound tooth; G2, G3, and G4 received a Class II mesial-occlusal-distal (MOD) preparation with an occlusal box width 1/3 of the intercuspal distance, and were restored with Filtek Z350 XT, IPS Empress Direct, and Charisma Diamond, respectively; G5, G6, and G7 received a Class II MOD preparation with an occlusal box width 2/3 of the intercuspal distance, and were restored with Filtek Z350 XT, IPS Empress Direct, and Charisma Diamond, respectively. After storage in water, at 37°C, the specimens were subjected to a fracture test under compression in a universal testing machine where the loads were applied vertically and at a speed of 0.5 mm/min.<bold>Statistical Analysis Used: </bold>Data were analyzed with two-way ANOVA and Tukey's multiple comparison post hoc test (P < 0.05).<bold>Results: </bold>G1 presented a fracture resistance significantly higher (P = 0.005) than any other experimental groups. Among the experimental groups, only G5 showed a significantly low fracture resistance (P = 0.019) when compared to the other groups. For the other resins, the change in intercuspal distance from 1/3 to 2/3 the intercuspal distance did not significantly reduce the fracture resistance (P > 0.05).<bold>Conclusions: </bold>The cavity preparation weakens the remaining tooth structure; however, its resistance could be partially restored using direct adhesive restorations.
- Subjects
DENTAL cavity preparation; DENTAL drilling; DENTAL fillings; TOOTH fractures; DENTAL bonding
- Publication
Indian Journal of Dental Research, 2018, Vol 29, Issue 4, p465
- ISSN
0970-9290
- Publication type
journal article
- DOI
10.4103/ijdr.IJDR_602_16