September, 2006, Vol. 8, No. 3
CONTENTS
SCIENTIFIC ARTICLES
Factors related to apical root resorption of maxillary incisors in orthodontic patients
76-79
Effect of the lower third molars on the lower dental arch crowding
80-84
Changes in the periodontal condition after replacement of swaged crowns by metal
85-87
Surgical lengthening of the clinical tooth crown
88-95
The relationship between blood serum lipids and periodontal condition
96-100
© 2006 Stomatologija
Stomatologija 2006; 8 (3): 67-69 
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Evaluation of diametral tensile strength and knoop microhardness of five nanofilled composites in dentin and enamel shades
Eduardo Gonçalves Mota, Hugo Mitsuo Silva Oshima, Luiz Henrique Burnett Jr., Luiz Antonio Gaieski Pires, Rogério Simões Rosa
Summary
The purpose of this study was to evaluate and compare the mechanical behavior of five nanofilled composites with dentin and enamel shades trough diametral tensile strength and knoop microhardness. 4 Seasons (Ivoclar Vivadent), Esthet X improved (Dentsply), Filtek Supreme (3M), Grandio (Voco) and Palfique Estelite (Tokuyama Dental Corp.) were used in this research. Twenty samples (6 mm diameter and 3 mm thickness) of each material were used. Ten samples were submitted to knoop microhardness and the others to diametral tensile strength examinations. The results were submitted to ANOVA and Tukey statistical tests (a=0.05). There were significant differences between the tested groups (p<0.05). The diametral tensile strength ranged from 36.08 (4 Seansons dentin) to 49.24 (Grandio enamel). The knoop microhardness ranged from 54.45 (Esthet X improved enamel) to 123.90 (Grandio dentin). A great variability in the mechanical behavior of the nanofilled composites was observed. However it was not recorded with dentin and enamel shades with the exception of Grandio.
Key words: nanofilled composite, diametral tensile strength, knoop microhardness.
Received: 07 08 2006
Accepted for publishing: 26 09 2006
*Pontifical Catholic University of Rio Grande do Sul, Brazil
Eduardo Goncalves Mota* – DDS, MS, PhD, assoc. prof.
Hugo Mitsuo Silva Oshima* – DDS, MS, PhD, assoc. prof.
Luiz Henrique Burnett Jr.* – DDS, MS, PhD, assoc. prof.
Luiz Antonio Gaieski Pires* – DDS, MS, graduate program student
Rogerio Simoes Rosa* – DDS, graduate program student
Address correspondence to Eduardo Goncalves Mota, Av. Ipiranga, 6681 - Building 6, Porto Alegre - Rio Grande do Sul, Brazil, ZIP code: 90619-900.
E-mail: eduardo.mota@pucrs.br