One of the mysteries of the English language finally explained.
Any of a class of polymer materials consisting of thermoplastic resins stabilized by ionic cross-linkages, used to make dental cement and sealants.
- ‘the golf ball's mantle is made of firm rubber, unlike other multilayer balls with mantles of ionomers or plastics.’
- ‘The final one, which is 1444, with insertion of glass ionomer followed by composite resin.’
- ‘The most common are called composite and glass ionomer.’
- ‘Most solid balls use an outer layer made of ionomer.’
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