Profile: Space Maintainers NE Inc. provides practice building products for the general dentist, pediatric, orthodontic, and periodontic practice.. Our product line includes removable appliance, fixed appliance, pediatric products, adult products, disposable products, educational products and laboratory products. We offer 4 in one quad tray which is ideal for space maintainers, space re-gainers, and crown and bridge impression. Its multiple perforations allow for superb retention of all impression materials. The unique design of the 360° swivel handle permits impressions of the upper or lower, right or left quadrants.