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| QOL | quality of life | 生活の質 |
| RT | radiation therapy | 放射線治療 |
| radiolucensy | 透過性 | |
| RLA | radiolucent area | 透過像 |
| ranula | ガマ腫 | |
| rapid cycler | 急速交代型 | |
| raspatory | 剥離子 | |
| receptor | 受容体 | |
| Rp. | recipe | 処方 |
| reconstruction | 再建 | |
| recurrence | 再発 | |
| referred pain | 関連痛 | |
| remineralization | 再石灰化 | |
| remission | 寛解 | |
| RPD | removal partial denture | 部分床義歯 |
| resection | 切除 | |
| resorption | 吸収 | |
| RT | retinier tooth | 埋伏歯 |
| retromolar pad | 臼後隆起 | |
| rhenorrhea | 鼻汁 | |
| RCT | root canal treatment | 感染根管治療 |
| rugae palatinae | 口蓋皺襞 | |
| R/O | rule out | 除外する |
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