RT Generic T1 Gingivitis descamativa crónica A1 Pinilla Calle, Carlos YR 2012 FD 2012 LK https://hdl.handle.net/20.500.14352/46578 UL https://hdl.handle.net/20.500.14352/46578 LA spa DS Docta Complutense RD 10 abr 2025