The aim of the present study is the clinical evaluation of a
new composite material, specifically designed for direct restorations of
posterior sectors of the oral cavity (Estelite Sigma Quick Posterior® - Tokuyama
This material has excellent mechanical, physical properties
and introduces important innovations, such as RAP technology (Radical Amplified
Photopolymerization Technology), allowing for a rapid material polymerization
(the polymerization time is about one-third shorter than other composite resins)
and a good stability to light.
Another advantage is the presence of hybrid fillers,
constituted by 0.2 µm spherical particles obtained by sol-gel process (ensuring
excellent material moldability and polishing) and 3 µm irregular particles
obtained by smash process, which implement the mechanical characteristics.
MATERIALS AND METHODS
our clinical experimentation was based on 10 direct restorations of posterior
sectors, using the above-mentioned material (restorations performed between June
2010 and March 2011).
We evaluated the clinical characteristics of the material and
patient feedback both at time zero (immediately after restoration) and at time
one, that is to say six months after restoration.
The criteria we used are based on the modified United States
Public Healt Service (USPHS) criteria, which constitute a system of clinical
evaluation suggesting an anamnestic, visual and instrumental (bodkin) analysis,
in order to evaluate:
integrity of restoration
anatomical form of the marginal ridge
anatomical form of the whole surface
margin discoloration; abrasion; postoperative sensitivity
Each of these criteria was rated (A= excellent; B =
acceptable; C = filling reconstruction; D = unacceptable), allowing for a global
evaluation of the characteristics of the material.
Estelite ∑ Quick Posterior ®
a single CQ molecule, if excited, allows to obtain more molecules of
radical anions (RA), which cause concurrent polymerization of more
Filler characteristics: SEM vision (2000 X magnification)
Filler volume: 86%
MPa Flexural strength: 215 MPa
Vickers hardness:87 Kg/mm after
30s of polumerization
Contraction stress:0.73 mPa
Light stability: 50s at 10000 lux
Polymerization time: 10s
Diagnosis of carious lesion Tooth isolation using the dental dam
3) Tissue removal using a diamond coated cylindrical burr, mounted on a
turbine, followed by cavity finishing using a tungsten carbide round bur
mounted on a micromotor.
4) The mordant was 37% phosphoric acid for 30s on the enamel and for 20s on the
dentin, followed by 30s rinsing and 20s drying
5) Application of EDTA for 20s, followed by
rinsing and application of 0.2 % chlorhexidine for other 20s.
6) Application of primer
7) Application of bonding, followed by polymerization for 20s.
8) Application of composite using the incremental procedure, modeling
each layer which is then polymerized for 20s.
9) Occlusal control after dam removal.
10) Finishing and polishing
Both at time 0 and time 1, Estelite Posterior produced excellent results for all
the examined criteria, with a few infrequent exceptions, confirming the
properties advertised by the manufacturer, from both a mechanical and clinical
perspective (See the graph below). Therefore, this material can be included in
the category of the best commercially available composite materials for
restorations of posterior sectors.
Congresso Nazionale dei Docenti di Discipline Odontostomatologiche e Chirurgia Maxillo Facciale
Firenze - Siena, 14-16 Aprile 2011
Universitą degli Studi di Bari
Dipartimento di Odontostomatologia e Chirurgia
Direttore: Prof.ssa D. DE VITO
Calabrodental S.r.l. Unitą Operativa di Chirurgia Maxillo-Facciale Regione Calabria Crotone Dir. San: Dott. M. W.
F.Inchingolo, V. Picciariello, F.
Inchingolo, G. Dipalma, A. Fioriello, M. Tatullo, A. M. Inchingolo, F. Pettini,
M. Marrelli, A. D. Inchingolo, M. De Carolis, A. Palladino
1) Brenna, Breschi, Spreafico et al: Odontoiatria Restaurativa, procedure di
trattamento e prospettive future, Ed. Elsevier, 2009;
2) J.L. Ferracane: Developing a more complete understanding of stresses
produced in dental composites during polymerization; J. Dent Mater 21 (1)
3) S.C. Bayne, G. Schmalz: Reprinting the classic article on USPHS
evaluation methods for measuring the clinical research of performance of
restaurative materials; Clin Oral Invest, 2005.