Long-term evaluation (20 years) of the outcomes of subepithelial connective tissue graft plus coronally advanced flap in the treatment of maxillary single recession-type defects.BACKGROUND
 Subepithelial connective tissue graft with coronally advanced flap (SCTG + CAF) has been considered the best and most predictable root coverage procedure.  1) to evaluate the long-term outcomes following SCTG + CAF in the treatment of gingival recessions (GR) and  2) to explore the influence of several tooth/patient-related factors on the stability of gingival margin at 1 year and at 5,10, 15, and 20 years after surgery.


 Forty-five patients with 45 maxillary GR (Miller's Class I or III) were treated with SCTG + CAF in a private practice between 1990 and 1997.  Recession depth (RD), probing depth (PD), keratinized tissue (KT) width and patient/tooth-associated variables were recorded for each GR at baseline, 1, 5, 10, 15, and 20 years after surgery.  Parametric, non-parametric, and logistic regression statistics were used throughout the study.


 A total of 21 Class I (44.67%) and 24 Class III (53.33%) GR were treated.  Considering all the 45 GR, statistically significant improvements were found for RD in all evaluations (P < 0.05) compared with baseline data.  Over the course of the study, mean root coverage (MRC) decreased from 74.23% (1 year) to 67.69% (20 years).  Within maxillary Class I defects, complete root coverage (CRC) at 1-year follow-up was 57.14% (n = 12) and 47.62% (n = 10) at the end of study period, whereas MRC decreased from 82.37% to 77.62%, respectively.  Within maxillary Class III recessions, CRC of 20.83% (n = 5) was found at both the 1-year and the 20-year follow-ups.  On the other hand, MRC decreased from 66.55% to 58.18%, respectively.  The results of logistic regression analysis showed that the achievement of CRC was associated with sites not presenting interdental tissue loss (i.e., Class I, odds ratio: 5.031, P = 0.024), whereas GR recurrence appeared associated with sites with attached KT < 2 mm (i.e., 5-, 10-, 15- and 20-year follow-ups), to teeth presenting root steps (i.e., 10- and 20-year follow-ups), and smoking (i.e., 15-year follow-up).


 CONCLUSIONS
 Positive RD reduction and KT improvements achieved by SCTG + CAF at short-term may be preserved long-term with the majority of the treated sites not displaying relapse of the gingival margin.  Teeth lacking a minimal 2-mm width of attached KT and presenting non-carious cervical lesions were more prone to develop an apical shift of the gingival margin during a 20-year follow-up period.
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