Page 199 - Handbook of Adhesion Promoters

192 Selection of Adhesion Promoters for Different

9.13 DENTAL

The adhesion between the root dentin and cement and between the fiber-post and the com-
1
posite core were assessed. The effects of the cleaning with alcohol, sandblasting, hydro-
gen peroxide, phosphoric acid or hydrofluoric acid etching, and silane treatment were
1
studied. Silanization increased the microtensile strength at the resin core. Sandblasting
1
significantly decreased the flexural strength as compared to other surface treatments.
2
Bacterial adhesion on dental implants may cause peri-implant disease. Many factors
affect bacterial adhesion such as surface roughness, surface free energy, surface chemistry,
titanium purity, abutment, cement, saliva, and protein absorbed on the surface of an
2
implant. Many surface modifications were studied, including protein absorption control,
controlled release of antibiotics, silver coating, chemical treatment with chemotherapeutic
agents, antimicrobial peptides, PEEK/nano-fluorohydroxyapatite, surface functionaliza-
2
tion and many more methods are discussed elsewhere.
The salivary pellicle is a biofilm that is formed by a selective adsorption of salivary
3
proteins. The typical functions of the salivary pellicle (lubricating properties, anti-caries
3
properties, etc.) are closely related to its adhesion strength to the tooth surface. The wetta-
bility and ζ-potential of enamel increased after only 1 min. saliva adsorption treatment
3
paving way to microbial colonization. The electrostatic interaction contributed to the
3
adhesion between the initial salivary pellicle and enamel surface.
The role of metal surfaces containing alumina and their interaction with 10-meth-
4
acryloyloxyl-dimethyl phosphate in the bonding process is discussed. Bonded transpala-
tal arch (stainless steel band material) was sandblasted and chemically enhanced with
4
silane.
The adhesion-promoting role of a polyalkenoic-acid conditioner was assessed for the
bonding effectiveness of a resin-modified glass ionomer to differently prepared dentin. 5
The use of conditioner resulted in a significantly higher bond strength only when dentin
5
was prepared by diamond bur (p < 0.05).
Five organosilanes, including 3-acryloxypropyltrimethoxysilane, 3-methacryloxy-
propyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, tetrakis-(2-ethyloxy-
ethoxy)silane and bis-[3-(triethoxysilyl)propyl]tetrasulfide were diluted to 1 vol% and
blended with a non-functional crosslinking silane, 1,2-bis-(triethoxysilyl)ethane (1%), in
95% ethanol, applied onto the silica-coated titanium, and bonded with bis-phenol-A-dig-
6
lycidyldimethacrylate. The primers containing 3-acryloxypropyltrimethoxysilane and 3-
methacryloxypropyltrimethoxysilane produced significantly higher shear bond strength
6
than the standard product used in the clinical dentistry.
The universal dental adhesion promoter composition contains an alkoxysilane mono-
mer (e.g., 3-methacryloxypropyltrimethoxysilane), a phosphoric acid ester monomer (e.g.,
1-methacryloyloxydecane-10-phosphate), a sulfur-containing monomer (e.g., 2,2-bisacry-
7
loylaminodiethyldisulfide) and an organic solvent.
The self-etching, self-conditioning dentine-enamel adhesives are used in restorative
dentistry. These adhesives are constructed such that they contain an adhesion monomer
with acid function, one or more non-acid comonomers, solvent, and a polymerization ini-
8
tiator. Methacrylamide phosphates having a high hydrolysis resistance are suitable as an
8
adhesion component for self-etching dental materials.