A New Generation Of Restorative Adhesives

A New Generation Of Restorative Adhesives
2005
Dr Liviu Steier
smile-on
Microfilled composites, hybrid composites and submicrometer hybrid composites have each come with their own advantages and disadvantages. The newest generation of restorative materials are nanofilled composites.
New features as described by the producer:
ÇƒÚNano particle filler technology gives unbeatable polish ability in a high strength, all purpose composite.
New, Polycarbonate/Bis-GMA resin is not only tough, it provides, soft, sculptable handling that doesn't get sticky.
Shades developed the same standards we use for our porcelain systems means reliable shade matching without a lot of fancy techniques or layering.
Research proven to he highly resistant to both occlusal wear and toothbrush abrasion.ÇƒÙ
Using the nanotechnology a higher filler rate could be attained in correspondence to hybrid materials. The excellent polish ability and the shrinkage rate of hybrid composite are unified in this new universal applicable dental restorative material.
What features do dentists look for when faced with a new, universally applicable generation of dental materials?
1. Modelling properties
2. Adaptability
3. Stickiness
4. Stability primary and secondary of use
5. Polishabilty
6. Shade ranges available, colour matching, colour stability
7. Integration in a complex adhesive system.
Modelling properties
a. Posterior restorations:
Static and dynamic occlusal forces are the major factors of influence on these restorations. Restoring a healthy anatomy is the first requirement. The cusp ÇƒÏ fissure contour, triangular ridge modellation, restoration of the contact point / surface can be executed just with a sculptable, firm and condensable material. Compared to competitors, 'Simile' is stiff, well applicable staying put and providing the whole range of requirements.
b. Anterior restorations:
The above mentioned characteristics are, of course, slightly different for the anterior restorations. Softer and smoother applicability is required. Warming the material immediately changes the viscosity properties, guaranteeing the desired features. All these features readily available for the restorative dentist.
Adaptability
Thanks to the recently introduced ÇƒÚNano-BondÇƒÙ, Simile is very well adaptabile even to delicate and difficulte to manipulate margins like those found in posterior cavity design.
The Nano-Bond self-etch primer starts with a PH of 1 and neutralises fast.
NanoÇƒÏBond system is also used in light ÇƒÏ or dual cure modus. NanoÇƒÏBond contains polyhedral ÇƒÏ shaped, surface functional nano-particles. This bridges the property space between hydrocarbon-based plastics and ceramics. It increases the modulus and hardness maintaining the stress and strain characteristics of the base resin.
Stickiness
Simile does not require the use of specially coated instruments.
Stability
Once the material is placed, adapted and burnished to the tooth walls or the anatomy model, there is no concern about bounce back. The restoration keeps the initial form.
Polishability
Polishability is one of the major advantages of this restorative material.
Optimum polishing results can be obtained with the 'Fini' disk system, characterised by an innovative centerless rubber mandrel collar. This disk collar provides a number of benefits:
elimination of gouging;
greater access;
if severe angulations are needed the disk can be used very close to the restoration, with no discoloration risk by handle contact;
having no centre further increases the usable surface area of each disk;
the rubber mandrel collar on each Fini Disk protects incisal edges when polishing lingual surfaces.
These thin, flexible disks are available in 5/16" and 1/2" diameters and are supplied in 4 grits: coarse, medium, fine and extra-fine. A total of 9 different disks are available. The coarse and medium grits are made from silicone carbide. These cut composite materials fast while leaving a moderately smooth surface. The fine and extra-fine disks contain micrograined aluminum oxide grit, which produces an ultra smooth, brilliant finish. To improve handling, the coarse and medium disks are less flexible and conform to the contour of the tooth with light pressure. This easy flexing is ideal for interproximal and marginal areas.
Shade ranges available, colour matching, and colour stability
A wide shade range of dentin, enamel, opaque and special tints is being introduced. The colours match the Vita shade colours very closely. Long-term results cannot be presented yet to prove the long-term colour stability.
Integration in a complex adhesive system
The materials referred to here complement one another and offer dentists a complete armamentarium for anterior and posterior restorations.
Following are three case studies to view:
Case number 1 (Page 2, 3, 4, 5)
Case number 2
Case number 3 (Page 2, 3, 4)
Research
Regarding the newly introduced nanocomposites, research could already prove that:
there is a slightly improvement in wear resistence and mechanical properties with the nanocomposite formulations versus conventional composite materials is existent (1).
all experimental nanocomposites showed excellent polish retention results. In compassion with hybrid and microhybrid composites significant improvements could be achieved with most of the experimental nanocomposites formulations. Nanocomposites did reach similar levels of polish retention as for microfilled composites. (2)
Çƒ? different formulations of nanocomposites display similar or even better results regarding compressive strength and fracture toughness than conventional composite materials (3).
Significant reductions in polymerization stress can be achieved through minor alterations in
composite chemistry (5).
Clinical Tests
The CRA Newsletter (March 2003) wrote the following advantages after being used by testers:
1. 75% of the testers considered that Simile will replace in the future other till now used restorative dental materials.
2. Simile is worth the money.
3. Good manipulation properties.
4. Good colour shades.
5. Easy and fast polishability.
6. Universal indication.
Conclusion
A new standard of dental restorative family is being introduced with very promising features. Every material out of the system is adjusted to each other. Good clinical manipulation, aesthetic results and research assure a brilliant future in up to date adhesive dentistry.
Future long term results will prove the outcame.
Literature
1. Wear resistence and mechanical Properties of Novel Dental Nanocomposites
D. Wu, B.N. Holmes, S.B. Mitra, B.U. Kolb, W.L. Thompson, N. Johnson
2. Aesthetic Properties of Novel Dental Nanocomposites
D. Wu, S.B. Mitra, N. Johnson, B.N. Holmes.
3. Toughness and Strength Properties of Novel Dental Nanocomposites.
D. Wu, B.N. Holmes, S.B. Mitra, B.U. Kolb, W.L. Thompson, N.Johnson
4. Espertise ÇƒÏ Filtek Supreme
C.-P. Ernst
5. Reduced polymerization stress through non-bonded nanofiller particles.
Condon JR, Ferracane JL. Biomaterials. 2002 Sep;23(18):3807-15.