Background:Various classification systems have been devised to classify gingival recession defects (GRDs). Recent evidence has raised many questions on the use of currently popular classification systems. The purpose of this systematic review is to assess various classification systems in the light of the current scientific literature.Methods:A comprehensive and systematic search was done to identify literature related to classification systems for GRD. Sources included books, journals, and online database. The search was done using the predefined criteria; 337 articles were initially identified through online database PubMed (Medline) and 12 from handsearch, of which a total of 10 full text articles were finally selected.Results:The classification systems which were included in the review included the classifications given by Sullivan and Atkins, Miller, Smith, Nordland and Tarnow, Kumar and Masamatti, and Mahajan. The systematic review revealed that the Sullivan and Atkins classification system for gingival recession was the most useful classification system for clinicians till the year 1985 in which P. D. Miller introduced the classification system for marginal tissue recession. From 1985 to till date, the Miller's classification system is the most frequently used and popular classification system.Conclusion:None of the classification systems for GRD fulfilled the ideal criteria; however, some of the recently introduced classification systems have evolved as a more comprehensive and viable alternative to already established classification systems.

Background: Gingival recession is a common periodontal problem encountered in most populations. A number of classification systems are available to classify gingival recession defects (GRDs), but there has been a lack of consensus among the clinicians regarding the choice of classification system to classify GRDs. Recently, Miller's classification has been criticized owing to its inherent limitations. Mahajan's classification was proposed to eliminate the drawbacks of Miller's classification system. To the best of our knowledge, there has been no study testing or comparing the reliability of Miller's classification; therefore, the present study was done to compare the reliability of Miller's classification with Mahajan's classification. Materials and Methods: The sites selected for the study were classified for GRD according to either Miller's classification or Mahajan's classification by the two groups of four examiners. All the examiners were calibrated for the two classification systems and classified the selected sites accordingly. Kappa statistics was performed to analyze the intra-and interrater agreement among the four examiners. Results: A total of 609 gingival recession sites in 91 patients (49 males and 42 females) were classified. At the end of the study, Mahajan's classification had a higher intrarater (κ = 0.93-0.83) and interrater reliability (κ = 0.93) compared to Miller's classification for GRD for both intrarater (κ = 0.57-0.68) and interrater observations (κ = 0.66), respectively. Conclusions: Miller's classification system was less reliable than Mahajan's classification system.

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