Predetermınatıon of Root Coverage for Recessıons Treated wıth Coronally Advanced Flap wıth Connectıve Tissue Graft: An Exploratıve Study

The coronally advanced flap (CAF) with connective tissue graft (CTG) has been confirmed as the gold standard for treatment of gingival recessions ). CTG-based procedures provide the best outcomes with superior percentages of mean root coverage (MRC) and complete root coverage (CRC) and keratinized tissue (KT) gain. Data in previous reports show CRC range from 18% to 83% after CAF+CTG in Miller Classes I and II defects which are associated with no inter-dental clinical attachment loss (interdental-CAL) (Recession Type 1-RT1)

The use of CTG under CAF significantly enhances the probability to achieve CRC (%57) in recessions in which interdental-CAL is equal or smaller than the buccal attachment loss (Recession Type 2-RT2). It has been emphasized that CRC percentage was very similar to the result (60%) of a multicentre study on the treatment of RT1 recessions (Cortellini et al. 2009). Moreover, CRC was higher than most of the reports on treatment of RT1 or Miller I and II defects (more than 80%) when baseline interdental-CAL was between 1 and 3 mm Therefore, various CRC outcomes of the literature indicate that there is need for additional defect defining criteria for predicting the outcomes of root coverage (RC) in RT 1 and RT2 (interdental-CAL≤ 3mm) recession defects.

Predetermination of final RC which is important for distinguishing 'expected versus actual' amount of RC was found to be related to inter-dental papilla height (IPH) and inter-dental clinical attachment level (ICAL) by the clinical studies which reported correlation between these two anatomical characteristics and CRC. Recently a new predictive classification of gingival recessions using the baseline avascular exposed root surface area (AERSA) as an identification criterion has been proposed. AERSA resulted as a strong predictor of final RC after laterally positioned flap (LPF) leading to a prognostic model with AERSA explaining 86% of the mean root coverage. In addition, due to anatomic variations, some Miller Class I defects may have larger AERSA than Miller Class II and III defects or there may be smaller Miller Class III defects than Miller Class I and II defects which may significantly influence the treatment results. These results could help to explain the outcome variations among previous studies.

The prognostic anticipation of a certain amount of RC is a complex process including patient-related, tooth/site-related (GRD, root abrasion, ICAL, tooth type, the dimension of inter-dental papilla, AERSA) and technique-related (e.g. quality of the CTG) factors and operator's skill. It is essential to define the most potent prognostic factors' combination which can increase the success and predictability rates, to make CAF+CTG the most convenient RC technique for patients and clinicians. Therefore the aim of this study was to explore the predictive values of baseline IPH, AERSA and ICAL measurements on the final RC outcomes after CAF+CTG in RT1 and RT2 class GR defects.