Mucogingival Versus Guided Tissue Regeneration Procedures in the Treatment of Deep Recession Type Defects

T he objective of the study was to compare the clinical efficacy of 3 surgical approaches in the treatment of deep recession type defects. Fifty‐four (54) gingival recessions ≥ 5 mm were randomly assigned, to 1 of the 3 treatment groups by blocking the prognostic variables. The first group was treated with a guided tissue regeneration (GTR) procedure using a bioabsorbable membrane, the second with non‐resorbable membrane, and the third with a mucogingival surgical approach consisting of a connective tissue graft combined with a coronally advanced flap (bilaminar technique). No differences, in terms of baseline oral hygiene and defect characteristics, were observed among the 3 groups showing an effective blocking approach. The 1‐year results indicated that 1) all treatment approaches resulted in clinically significant root coverage and attachment gain; 2) a statistically significant treatment effect ( P = 0.012, ANOVA) was observed comparing the bioabsorbable (4.9 ± 0.3 mm), the non‐resorbable (4.5 ± 0.8 mm), and the bilaminar (5.3 ± 0.7 mm) groups, in terms of root coverage; 3) the difference in terms of root coverage between the bilaminar and the non‐resorbable membrane groups was statistically significant while differences between the 2 GTR groups or between the bilaminar and the bioabsorbable membrane groups did not reach statistical value; 4) the 95% confidence intervals for the proportions of complete successes showed a similar pattern; 5) no statistical difference was demonstrated in the amount of attachment gain among the 3 groups ( P = 0.73, ANOVA). A regression model showed that the amount of root coverage was significantly affected by the initial recession depth, the procedure and smoking habits: a poorer root coverage result is expected in case of shallow recession type defects, when either bioabsorbable ( P < 0.05) or non‐resorbable ( P < 0.001) membranes are used instead of a bilaminar technique and if the patient smokes ( P < 0.01). It was concluded that the mucogingival bilaminar technique is at least as effective as GTR procedures in the treatment of gingival recession ≥ 4 mm and thus recession depth is not the parameter which influences the selection of the surgical procedure. J Periodontol 1998;69:138–145 .