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A Comparative in vitro Study. Estudio Comparativo in vitro. The use of indirect restorations have increased in tooth with great dental destruction due to their physical and mechanical properties that bestow higher durability than other type of restoration. The aim of the study was to compare the flexural resistance of four indirect restoration materials composite Filtek P60; ceromers Adoro and Ceramage; ceramic IPS e.
Filtek P60 flexural resistance is significantly higher than Ceramage. Adoro flexural resistance is significantly lower than all the other materials.
Dentalees is necessary to make absolutely clear that the research was executed in vitro, whereby its resistances may differ than in mouth because of the cementation and the “mono-block” formation.
Through the research it was determined that Filtek P60 is significantly higher than Ceramage, and that Adoro is significantly less than all the other compared materials regarding flexural resistance; whereby the raised hypothesis is nullified.
Since the beginning of history people have been concerned with their smile aesthetics, and for this reason improvements are constantly made in biomaterials. The first restorative materials were very durable, but their aesthetic was poor, since they were grey or metallic color.
Through the years aesthetics evolved and patients no longer wanted to have metal in their mouths, so they asked for a material that had the same color as their teeth and that concealed the restoration at the same time. This is how more aesthetic material that fulfilled these demands was developed: There are two different types of restoration: The last ones generally require the patient to visit the dental clinic two times or more, before finishing the restoration ADA Council on Scientific Affairs, ; Lanata, The use of indirect restorations have increased in tooth with great dental destruction due to their physical and mechanical properties that bestow higher durability than other type of restorations and guarantee resistance to the remaining tooth.
Another advantage is that multiple laboratory stages can be done without the patient, thereby avoiding additional time spent in the dental office ADA Council on Scientific Affairs. The more used indirect restorations materials are composites, ceramics and ceromers.
The first one, also known as compound resin, is a biphasic material whose components are represented by an organic matrix and a ceramic filling that grants the optical and mechanical properties needed ceromeroe restoration Lanata; Macchi, Ceramics, a material formed by non-metallic inorganic denales, which joined with metallic oxides originates the known dental porcelain Lanata; Macchi.
Ceromers, a biphasic material formed by an organic matrix modified with polymers and a ceramic filling that grants the mechanical and optical properties Lanata; Macchi.
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All these materials have excellent aesthetic results, making cermeros restoration almost imperceptible, but like all restorative material they have their disadvantages; in this case, their limited resistance to the forces produced inside the oral cavity. The three-point analysis employs rectangular bar samples submitted to a central loading, creating a non-uniform stress field Fischer et al.
The resistance to flexion is reflected in the capacity of a material to endure traction efforts and therefore the risk of fracture Enqvist et al. The material was compacted inside a stainless steel mold positioned between dentals glass slides. The same mold was used. The excesses drntales eliminated with a Sof-Lex strip. For the IPS e. Wax patterns were made with the aforementioned measures and injected ceramic was used to make the samples.
These were cooked in a dental laboratory, using a ceramics cooking oven at a temperature and time determined by the manufacturer. All the samples were stored in distilled water at 37 degree Celsius for twenty-four hours and their measures were checked with a digital caliper Digimatic caliper, Mitutoyo Corp. The maximum breaking load of each specimen was obtained, and the flexural resistance MPa was calculated using the following formula: Maximum ceromerso in Newton l: Distance between the supports b: Ten bars of each material were submitted to a three-point test until fracture, to determine the resistance to flexion.
The statistical analysis pointed out significant differences between materials for the flexural strength Table I. Average flexural strength MPa and standard deviation for each material.
An interesting finding was that ceromers values were quite dissimilar, showing differences between materials of the same type but different manufacture Fig.
Flexural strength values can be arranged from highest to lowest in the following order: In this health technology evaluation study, the main purpose was to compare the resistance to flexion of composite Filtek P60, ceramic IPS e. According to the values obtained after the test, the composite presented the highest flexural resistance, while the ceromer Adoro showed the lowest value.
The Filtek P60 is a photo-curable resin that has a particle size of 0. Its composition is basically UDMA and Bis-EMA, which gives special properties like less contraction to curing, a high resistance to traction and flexion; in addition its handling is much softer Rodrigues Junior et al. Adoro is compounded by nanometric particles and unaliphatic dimethacrylate of low viscosity manufactured by the same company to replace Ceromerks and Bis-EMA, having and easier manipulation and chromatic stability.
Through the research it was determined that Filtek P60 is significantly higher than Ceramage, and that Adoro dentwles significantly lesser than all the other compared materials regarding flexural resistance; whereby the raised hypothesis is nullified.
Deentales results of the study can lead to new research, like testing the effect on the flexural strength of pre-heating the composite before polymerization. Additionally it is recommended to study the elastic module on the materials used in this research, to have more parameters to compare the materials with.
Also a flexural resistance dentlaes of the different types of materials in teeth could be done to determine the flexural resistance in a “mono-block”.
Direct and indirect restorative materials. Chicago, American Dental Association, New American Dental Association specification N 27 for direct filling resins. Flexural and diametral tensile strength of composite resins. Flexural strength measurement of ceramic dental restorative materials.
Flexural strength of veneering ceramics for zirconia. Buenos Aires, Grupo Guia, ceromeeos Buenos Aires, Medica Panamericana, Alternative methodology for flexural strength testing in natural teeth. Flexural strength and modulus of elasticity of different types of resin-based composites.