T Larsen1, N E Fiehn. 1. Department of Oral Microbiology, School of Dentisty, University of Copenhagen, Nørre Alle 20, DK-2200 Copenhagen, Denmark. tl@odont.ku.dk
Abstract
AIM: To evaluate the effect of a disinfectant agent based on hydrogen peroxide (Sterilex Ultra, Sterilex Corporation, Maryland, USA) on the microbiological water quality in dental unit waterlines (DUWL). SETTING: Six older dental units were disinfected with Sterilex Ultra and another six units with sodium hypochlorite. The results were compared to six non-disinfected units examined during a period without patient treatment. OUTCOME MEASURE: The number of colony forming units of bacteria (cfu)/ml of water was determined according to European Standards on water quality. DESIGN: The water quality was initially determined during a six week period, and subsequently in more detail for two weeks. Finally, the effect of prolonged administration of Sterilex Ultra was investigated for six weeks. RESULTS: Instillation of Sterilex Ultra according to the recommendations of the manufacturer initially reduced the number of bacteria in DUWL to <10(2) cfu/ml. However, following daily, as well as prolonged administration of Sterilex Ultra a gradual recolonisation was observed resulting in bacterial numbers >10(4) cfu/ml in a number of units. Major differences between the number of cfu/ml in individual units were observed. CONCLUSION: Neither daily nor extended administration of Sterilex Ultra was capable of maintaining an acceptable water quality in these older dental units.
AIM: To evaluate the effect of a disinfectant agent based on hydrogen peroxide (Sterilex Ultra, Sterilex Corporation, Maryland, USA) on the microbiological water quality in dental unit waterlines (DUWL). SETTING: Six older dental units were disinfected with Sterilex Ultra and another six units with sodium hypochlorite. The results were compared to six non-disinfected units examined during a period without patient treatment. OUTCOME MEASURE: The number of colony forming units of bacteria (cfu)/ml of water was determined according to European Standards on water quality. DESIGN: The water quality was initially determined during a six week period, and subsequently in more detail for two weeks. Finally, the effect of prolonged administration of Sterilex Ultra was investigated for six weeks. RESULTS: Instillation of Sterilex Ultra according to the recommendations of the manufacturer initially reduced the number of bacteria in DUWL to <10(2) cfu/ml. However, following daily, as well as prolonged administration of Sterilex Ultra a gradual recolonisation was observed resulting in bacterial numbers >10(4) cfu/ml in a number of units. Major differences between the number of cfu/ml in individual units were observed. CONCLUSION: Neither daily nor extended administration of Sterilex Ultra was capable of maintaining an acceptable water quality in these older dental units.
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