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the broxo electric toothbrush was introduced in the usa by e. r. squibb and sons pharmaceuticals in 1959.
==zgodovina==prva električna zobna ščetka, broxodent, so zasnovali v Švici leta 1954, razvil jo je dr. philippe-guy woog.
in 1992, the us fda first allowed the use of ultrasound at a frequency of 1.6 mhz in a toothbrush.
==varnost ultrazvoka==ultrazvok se v medicini uporablja že skoraj pol stoletja, skozi celotno obdobje pa so preučevali tudi njegovo varnost.
the effectiveness of an electric toothbrush depends not only on its type of action and on correct use, but also on the condition of the brush head.
ultrazvočnim zobnim ščetkam za vsakodnevno domačo rabo je ameriška agencija za hrano in zdravila (fda) odobrila delovanje pri frekvenci 1,6 mhz oziroma 192.000.000 gibov na minuto.
== history ==the first electric toothbrush, the broxodent, was conceived in switzerland in 1954 by dr. philippe-guy woog.
leta 1993 je ameriški inštitut za ultrazvok v medicini (american institute of ultrasound in medicine, aium), v povezavi z national electrical manufacturers association (nema) razvil standard output display standard (ods), ki vključuje indeks toplote in mehanski indeks, katera sta bila dodana v nove predpise fda za ultrazvočne naprave.
in order for a toothbrush to be considered "ultrasonic" it has to emit a wave at a minimum frequency of 20,000 hz or 2,400,000 movements per minute.
večina sodobnih akumulatorskih električnih zobnih ščetk, kot naprimer sonicare in oral-b, sodi v to kategorijo in ima frekvenco delovanja v področju od 200 do 400 hz, kar ustreza 12.000-24.000 pulzov oziroma 24.000-48.000 gibov na minuto.
== history ==the first ultrasonic toothbrush, initially branded ultima® and later ultrasonex® by sonex corporation, was first patented in the usa in 1992 by robert t. bock, the same year the fda gave it approval for daily home use.
najpogostejša frekvenca ultrazvočnih zobnih ščetk, pri kateri so bile tudi izvedene številne znanstvene študije , je v območju približno 1,6 mhz oziroma 96.000.000 pulzov ali 192,000,000 gibov na minuto.