Tření ortodontických zámků
| Title in English | Friction in orthodontic brackets |
|---|---|
| Authors | |
| Year of publication | 2015 |
| Type | Article in Periodical |
| Magazine / Source | Ortodoncie |
| MU Faculty or unit | |
| Citation | |
| Field | ORL, ophthalmology, stomatology |
| Keywords | static friction dynamic friction angulation |
| Description | The aim of study was to measure static and dynamic friction in different types of orthodontic brackets in vitro, to determine whether the friction values change with modified angulation of the bracket, and to compare friction in groups of brackets made of different materials. 24 types of orthodontic brackets were measured. Measurements were done with the tensile test machine ZWICK Z020 in all 72 orthodontic brackets with one orthodontic wire made of stainless steel. All measurements were performed under standard conditions in a laboratory, in a dry environment and in angulation of 0, 52 and 10 degrees. If follows from the results that both static and dynamic friction is different for different types of brackets. The highest values are found in the brackets made of monocrystalline ceramics. Increasing angulation corresponds proportionally to increasing values of friction. Between the orthodontic brackets made of the same materiál (metal, plastic, ceramic, and with an inserted metal slot) we did not find a statistically significant difference in the value of dynamic friction. Though in vitro condition when examining friction of materials of orthodontic brackets differs from in vivo condition of mouth cavity, the effort to reduce the friction of orthodontic materials by influencing mechanical factors is very important. |