Latar belakang: Skeling dan penghalusan akar (SPA) dapat mengubah komposisi bakteri patogen. Tujuan: Mengetahui efek klinis dan mikrobiologis (P. gingivalis, T. forsythia) setelah SPA pada periodontitis kronis poket 4-6 mm. Metode: Empat puluh tiga subjek diperiksa kedalaman poket, indeks pendarahan gingiva, sampel plak subgingiva, serta dilakukan SPA pada kunjungan awal, bulan kedua, ketiga, keenam. Hasil: Kedalaman poket, pendarahan gingiva, populasi P. gingivalis, T. forsythia menurun (p<0,05). Penurunan kedalaman poket tidak berhubungan dengan penurunan populasi P.g (p>0,05). Kesimpulan: SPA meningkatkan kondisi klinis dan mikrobiologis poket 4-6 mm. Perbaikan kondisi klinis berhubungan dengan penurunan kedua bakteri kecuali kedalaman poket dengan populasi P.gingivalis.

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Background: Scaling and root planing (SRP) can change the composition of bacterial pathogens.

Objective: To know the clinical and microbiological effects (P.gingivalis and T. forsythia) of SRP at 4-6 mm pocket depth of chronic periodontitis.

Method: Forty-three subject were performed with SRP on the initial visit, two, three, six month. Pocket depth, gingival bleeding index (PBI) and subgingival plaque samples were examined.

Result: (There is a) decrease in pocket depth, gingival bleeding index, populations of P. gingivalis and T. forsythia (p <0.05). The decrease in pocket depth was not associated with a decrease in the population of P.g (p >0.05).

Conclusion: SRP can improve clinical and microbiological condition in the treatment of chronic periodontitis with 4-6 mm pocket depth. The improvement of clinical condition is associated with the decreasing of bacteria population, except pocket depth is not associated with the P. gingivalis population.