Four or more standard size implants are placed and joined by bars similar to the above clip on but removable denture over bars. In this case, however, the denture is screwed onto the bar and not removable by the patient. These appliances allow 60 - 80% of maximum chewing ability. Since they can not be removed for cleaning after each meal, the denture borders are raised off the gum tissue enough to allow floss to pass under the base. Also frequent brisk rinsing and use of an irrigator such as a "Water-Pik" are highly recommended for cleaning several times each day.
The bar under-structure is similar to the previous over denture however the denture is not removable by the patient since it is screwed down to the bars.