Electrode Potential of Soldered Gold Crown Bridge in the Mouth

Abstract

The electrode potentials of soldered gold crwon bridges in the mouth were measured in a clinical situation using a pH-meter in conjunction with a platinum micro-probe and a saturated calomel elctrode. Eleven patients who participated in the study were restorated with four onesoldered bridges or nine two-soldered bridges which were prepared from commercial gold alloy and gold solder by conventional prosthetic procedures. During a period of three months after the insertion of bridges the electrode potentials of the bridges in the mouth were in the range of 0.03-0.19 V (SCE) for one-soldered bridges and 0.05-0.24 V (SCE) for two-solderes bridges. It indicated that the soldering under this experimental conditions had little influence on the electrode potentials of soldered gold crwon bridges in the mouth. The measurements of electrode potential in vitro showed that the potentials of the gold alloy and the gold solder in 0.1 N sodium chloride solutions were close to the potentials in the mouth. In acid solutions, however, the electrode potentials of the alloys were noble to those in neutral or alkaline solutions.