| http://www.w3.org/ns/prov#value | - Afterwards, many investigations were carried out for developing etch patterns by changing the etching solution, etching time, and temperature. [18],[19],[20],[21] However, through recent progresses in material science, various surface treatments with the purpose of increasing tensile bond strength of luting cements to metal surfaces have been introduced, e.g. alumina blasting, tin plating, silicoa
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