Immunological and Microbiological Assessment of Maxillary Acrylic Resin Complete Dentures Reinforced by Gold Plated Cr-Co Palatal Plate
Phase: NA
Conditions: Denture Stomatitis
Sponsor: Badr University

Immunological and Microbiological 
Assessment of Maxillary Acrylic Resin 
Complete Dentures Reinforced by Gold 
Plated Cr-Co Palatal Plate  
 [NCT ID not yet assigned] 
Unique Protocol ID: 01012336911 
Document Date: 15/7/2022 
 
 
 
 
 
 
 
 
 

A. Use of gold in complete denture: 
The alloys which are still used in dentistry nowadays, are placed within 
several groups. These are the noble ones, that have a high content of noble metals 
(gold, platinum, palladium), and the non-noble metals (base metals). Gold alloys 
have been used in dentistry since 1932. Back in that time, after several attempts to 
mix gold with silver, copper or platinum, these alloys were categorized in the 
following way: soft, mid, hard, super-hard. It was quickly noticed that gold alloys 
(with gold content lower than 65%) corroded too quickly. This problem was solved 
in 1948, when palladium was added. Later, in the 1950s, gold alloys were 
supplemented with platinum. This lowered its expansion and improved the 
connectivity of metal and ceramics. 
Gold is a metal that has been known for hundreds of years. Thanks to its 
properties, among these being specific weight of 19.3, melting point 1062°C, boiling 
point 2600°C, ductility and plasticity, as well as thermal or electric conductivity, it 
is frequently used in everyday dental practice, chiefly as a substructure for prosthetic 
restorations. 
Today, gold is widely used in prosthetics. Its use ranges from being employed 
in the fabrication of removable dentures, where the inner surface permanently 
touching oral cavity tissues, through to fixed dentures, and even some structures of 

certain implantological systems. All such items can be made of galvanized gold.  
Thus, new technologies have made gold and its alloys a kind of a universal material. 
B. Statistical Analysis: 
Data were presented as means and standard deviation (SD) values. The 
comparison between any two groups were done using independent t-test (Student`s 
t-test).  
Statistical analysis was performed with SPSS 20® (Statistical Package for 
Social Science) and Microsoft Excel2010. The significant level was set at P ≤ 0.05.