ABSTRAK
Tujuan penelitian ini untuk mengetahui pengaruh pH minuman kemasan terhadap gayaregang power chain. Digunakan 28 power chain merk ormco, tipe tertutup, bening, yangdiregangkan pada 2 titik berjarak 40 mm pada plat akrilik dan direndam dalam larutan tehbotol, buavita, coca cola dan aquades. Gaya regang (grf) power chain diukur menggunakanforce gauge dan dicatat gaya awal, setelah 1 jam, 24 jam, 48 jam, 72 jam, 168 jam dan 336jam perendaman. Terjadi penurunan gaya regang power chain yang signifikan, namun tidakterdapat perbedaan signifikan terhadap setiap waktu perendaman dalam perbedaan pH larutanteh botol, buavita, coca cola dan aquades.

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ABSTRACT
The aim of the study was to evaluate the effect of teh botol, Buavita, coca cola and distilledwater toward force decay of orthodontic power chain. Twenty eight power chains (Ormo,closed type, tranparant) were fixed on acrylic framework (40 mm of distance) and immersedin teh botol, buavita, coca cola and distilled water. Force decay were measured using tensiongauge (grf) and recorded at initial force, 1 hour, 24 hour, 42 hour, 72 hour, 168 hour and 336hours of immersion. There was a decrease of force, however acidity did not influence forcedegradation of power chain statistically.