Adhesion to Dental Tooth Tissue

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Adhesion to dental tooth tissue.
Adhesive Dentistry is a relatively, new field that has totally revolutionized the face of dentistry. It is based on the concept of adhesion and totally covers the areas of anterior & posterior cosmetic restorations
4. Innovations in dentistry have always been related to the development of new materials , techniques &equipments and thus , were always subject to changing and disappearing with the evolution of newer ones. For the first time, innovation related to adhesion is concept related , whereas the materials & techniques are revolving and changing around this concept to satisfy it and improve it without changing it .
5. The dream of restorative dentistry
6. concept of adhesion and its application in dentistry
7. Historical breakthroughs in adhesive dentistry
8. Historical breakthroughs in adhesive dentistry 2- In 1955 , Dr.Michael Buonocore in usa
9. Historical breakthroughs in adhesive dentistry
10. Terminology Adhesion is the bonding of dissimilar materials by the attraction of atoms or molecules
11. Wetting. It is very difficult to make two solid surfaces to adhere completely
13. Contact angle is the angle formed by the adhesive with the adherend at their interface
Mechanisms of adhesion in restorative dentistry
Retention of adhesive restorations in cavities
reliable and durable adhesive junction between the tooth tissues and the adhesive restorative material
Clinical significance of adhesion
3- Solving the problem of retention especially in anterior teeth
Requirements of a successful adhesive bond
2- Elimination of voids at the interface
3- Stability and longevity - The adhesive joint should be free from any dimensional changes due to hardening or thermal changes
22. Properties that should be present in the tooth tissues (adherend) and in the adhesive in order to provide for a successful adhesive system
23. 5- The adhesive should contain both, hydrophilic components to displace water and properly penetrate the tooth surface
24. Bonding to tooth tissues - Bonding to enamel & dentin is basically mechanical in nature
25. Bonding to tooth tissues
26. Hybrid Layer Resin Tags Dentin Hybrid Layer Hybrid Layer Resin Tags Enamel Hybrid Layer
27. Bonding to dentin is more difficult,complicated and less reliable than bonding to enamel 4- The structure of dentin is heterogenous. Enamel Dentin. Development of dentin bonding agents 1-First generation bonding agents - A co-monomer was used ( primer ) to react chemically inorganic Ca hydroxyapatite collagen of dentin , e.g. NPG-GMA Second generation bonding systems ( phosphate bonding agents ) - Phosphate esters BIS-GMA resins
3- Third generation bonding agents 4- Fourth generation bonding agents
32. 5-Fifth generations dentin bonding agents introduced to minimize the clinical steps of bonding by amalgamating more than one step together (self-etching primer + adhesive) (self-etching adhesive) 크라운 브리지 치아
34. Classification of dental adhesives
36. - Types of adhesives 1-Etch & rinse adhesives(smear layer removing) a- three steps : etching , priming and bonding are done in 3 separate steps
41. nanoleakage phenomenon
42. Self-etch adhesives further classified acidity or aggressiveness into mild (pH more than 2), intermediate (pH = 1.5) & strong (pH less than 1)
45. In particular, high concentrations of water raised questions about potentially harmful effects on polymerization
46. Resin modifies glass inomer adhesive
49. Universal adhesive systems/“multi-mode″ or ″multi- purpose″ adhesives
50. The composition of universal adhesive differs from current SE systems by incorporation monomers
51. Steps of bonding A- Selective acid demineralization (etching , conditioning)
52. Resin Tags Open D.T.
53. Conditioned Dentin Open D.T. Intertubular D. Collagen Network.
54. SEM micrograph resin- dentin interface A, Adhesive; D, residual dentin; H, hybrid layer resin tag.
55.Types acids most commonly used are phosphoric acid (10-37%) and maleic acid (10%)
56. penetrates inside the created pores where it polymerizes forming retention tags inside them from the tooth-tissue side
57. - The primer is applied with small brushes or sponges
58. E. & D. etching Chalky white appearance of Enamel Priming Glossy surface
59. Bonding Agent Application Light curing After Curing
60. Smear layer - Following cutting of dentin with rotary tools, a layer 2-5 microns in thickness is formed on the surface of dentin
61. - Adhesive systems should totally remove this smear layer ,or penetrate through it to provide for efficient bonding
62. Wet bonding versus dry bonding - Following etching & rinsing , enamel dentin present different conditions for priming & bonding
63. Collapse of Etched Dentin.
Lectures Dentist