engleski

Influence of intraoral application of antiseptics and fluorides during orthodontic treatment on biomechanics of remodeling of dental arches

Objectives: The aim was to investigate how corrosion induced by intraoral application of antiseptics and fluorides during orthodontic treatment influence biomechanics of remodeling dental arches. Methods: Sample consisted of 36 subjects aged 13-42 years, 56% females. There were 12 subjects in each experimetal group – exposed to saliva, chlorhexidine (Curaspet ADS 212, Curaden, Italy) or fluorides (Mirafluor-K-gel, Hager Werken, Germany) for 30 days. Plaster casts of dental arches were made and analyzed when NiTi alloy archwire 0.020x0.020'' (BioForce PLUS, Dentsply GAC International, USA) (T1) was placed intraorally and after 90 days (T2). Change was quantified as the difference in dimensions (T2-T1) in maxilla and mandible. Anterior width-to-lenght ratio was used as a measure for dental arch shape. Results: Changes in dimensions of dental arches were mostly up to 1 mm. Amount of change of dental arch shape in maxilla was similar in experimental groups. In mandible, only NiTi exposed to saliva changed dental arch shape significantly more than those exposed to fluorides or chlorhexidine with large effect size (p=0.004 ; η2=0.408). The change was more significant in lenght with low effect size (p=0.031 ; r=0.199) than in width. Exposing NiTi archwires to fluorides induced the lowest change of dental arch shape, significantly less than exposure to chlorhexidine. Mandibular dental arch exposed only to saliva reshaped to a more rectangular form, while after exposure to antiseptics it became more tapered. Conclusion: Using fluorides or oral antiseptics for caries and gingivitis prevention during orthodontic treatment affects elasticity of NiTi in comparison to effect of saliva exposure itself. Because the shape of dental arch had changed the least after exposure of the wire to fluorides, it seems that fluorides reduce the elasticity of NiTi. However, the amount of changes, though statistically significant, was very small and probably would not have clinical implications in changing orthodontic biomechanics.

NiTi alloys ; Elasticity ; Fluorides ; Oral antiseptic ; Dental arch shape

Rad je izrađen u skopu projekta financiranog od strane Hrvatske zaklade za znanost (Imunosne i regenerativne implikacije korozije dentalnih materijala kod djece i adolescenata - HRZZ-IP-2014-09- 7500)