Patent ID: 9717567
Date: 2017-08-01
CPC Classifications: A61C

Claim:
1. A tear-resistant dental dam, comprising: a first thermoplastic elastomeric sheet; and a second thermoplastic elastomeric sheet having an entire first side disposed directly on and contacting the first thermoplastic elastomeric sheet, the first and second thermoplastic elastomeric sheets having a grid pattern of weld joint regions that couple together the first and second thermoplastic elastomeric sheets, the grid pattern of weld joint regions defining a plurality of unwelded regions of the first and second thermoplastic elastomeric sheets, the first side of the second thermoplastic elastomeric sheet is not welded to the first thermoplastic elastomeric sheet in the plurality of unwelded regions, the first side of the second thermoplastic elastomeric sheet contacting and covering the first thermoplastic elastomeric sheet in the plurality of unwelded regions, a combined thickness of the first and second thermoplastic elastomeric sheets in each unwelded region of the plurality of unwelded regions being greater than a combined thickness of the first and second thermoplastic elastomeric sheets in the grid pattern of weld joint regions.