Effect of bracket bevel design and oral environmental factors on frictional resistance

Chang, Ching‐Ping; Lee, Tzer Min; Liu, Jia Kuang

doi:10.2319/101612-808.1

Cited by 26 publications

(26 citation statements)

References 27 publications

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“… 19 This may be explained by the fact that artificial saliva has rheological properties that limit the formation of film. In another paper, 27 in which artificial saliva caused increased friction, brackets were angled, a condition that considerable increases friction and presumably makes lubrication of secondary importance.…”

Section: Discussionmentioning

confidence: 99%

Lubricating conditions: effects on friction between orthodontic brackets and archwires with different cross-sections

Almeida

Amaral

et al. 2019

Dental Press J. Orthod.

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Objective: This study investigated the effect of the condition of lubrication on the friction between brackets and NiTi archwires of different rounded cross-sections. Methods: Brackets (Roth, GAC) were affixed to a device connected to a universal testing machine into which segments of archwire were placed (NiTi, Nitinol, GAC) with cross-sections of 0.012-in, 0.016-in and 0.020-in. Once the wire was in the bracket slot, the following lubricants were applied: human saliva (HS: positive control), distilled water (DI), mucin-based (MUC) or carboxymethylcellulose-based (CMC) artificial saliva. In the negative control group, no lubricant was used. The combination between the wire cross-sections and the lubrication condition generated 15 groups with 15 samples each. Data were submitted to two-way analysis of variance and Tukey’s test. Results: There was no significant interaction between the wire cross-section and the condition of lubrication (p= 0.901). Irrespective of whether lubricants were used or not, there was a significant increase in friction with an increase in the cross-section of the wire (p< 0.001). For any wire, the group tested in the presence of MUC was not different from that in which HS was applied. On the other hand, when the application of lubricants was suppressed, significantly higher friction values were observed. The CMC group and the DI group demonstrated intermediate behavior. Conclusions: Friction increased with the increase of the cross-section of the NiTi archwire, but regardless of the archwire, friction with MUC artificial saliva was similar to that of HS and lower than in dry conditions.

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Section: Discussionmentioning

confidence: 99%

Lubricating conditions: effects on friction between orthodontic brackets and archwires with different cross-sections

Almeida

Amaral

et al. 2019

Dental Press J. Orthod.

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“…It is reported, the sliding friction force between 0.014 inch NiTi wire and the bracket ranged from 2.94 to 31.42 N in a simulated intra-oral environment. After the mechanical test, the presence of deeper binding scratches was observed by SEM (Chang et al 2013). Doshi and Bhad-Patil found a positive correlation between roughness and frictional resistance of orthodontic wires and brackets (Doshi and Bhad-Patil, 2011).…”

Section: Resultsmentioning

confidence: 99%

The effect of the titanium nitride coating on bacterial adhesion on orthodontic stainless steel wires: in vivo study

Amini¹,

Bahador²,

Kiaee³

et al. 2017

Biosci. Biotech. Res. Comm

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The aim of the current study was an in vivo evaluation of the bacterial adhesion on TiN coated orthodontic stainless steel wires in 20 patients (age15-25) undergoing fi xed orthodontic treatment who have the indication for placement of 0.019 ×0.0 25 inch Stainless steel arch wires in both jaws. TiN coatings were formed on orthodontic stainless steel wires by physical vapor deposition (PVD), Then the accuracy of the procedure was detected using SEM microscopy (PHILIPS XL 30) at ×2000 magnify. Each patient will serve as their own control, the coated arch wires will randomly be assigned to one jaw and the opposing jaw will receive a non-coated arch wires. After 4 weeks, the arch wires will be removed and cut at the same lengths (20mm). The samples were placed in sterile dishes containing phosphate buffered saline. After separation of bacteria in trypsin (25%) and ethylene di-amine teta-acetic solutions for 45 minutes, the diluted solution was cultured in blood agar and bacterial colony forming units were counted. According to the results, signifi cant difference detected on colony count on TiN coated orthodontic stainless steel wire (4 ± 3.4 ×10 4 ) compared to non-coated orthodontic stainless steel wire (8 ± 7.4 × 10 4 ) (P = 0.03). These results suggested that the TiN coated orthodontic stainless steel wire decreased bacterial growth and enhanced oral hygiene.

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“…Bracket slot configuration and ligation methods have been reported to affect frictional force and critical contact angle (4,11,13,17,18,(30)(31)(32)(33)(34). When an archwire is engaged in the bracket slot, the effective slot dimension is mainly determined by the fourth slot wall (or ligation method) and the type of tooth displacement.…”

Section: Discussionmentioning

confidence: 99%

Effect of tooth displacement and vibration on frictional force and stick-slip phenomenon in conventional brackets: a preliminary in vitro mechanical analysis

Seo

Lim

Park

et al. 2014

The European Journal of Orthodontics

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SummaryObjective: To evaluate the effects of tooth displacement and vibration on frictional force and stickslip phenomenon (SSP) when conventional brackets were used with a levelling/alignment wire. Materials and Methods:The samples consisted of six groups (n = 10 per group) with combinations of tooth displacement (2 mm lingual displacement [LD], 2 mm gingival displacement [GD], and no displacement [control]) and vibration conditions (absence and presence at 30 Hz and 0.25 N). A stereolithographically made typodont system was used with conventional brackets and elastomeric ligatures. After application of artificial saliva, static/kinetic frictional forces (SFF/KFF) and frequency/amplitude of SSP were measured while drawing a 0.018-inch copper nickel-titanium (Cu-NiTi) archwire at a speed of 0.5 mm/min for 5 minutes at 36.5 degree celsius. Two-way analysis of variance and independent t-test were performed. Results: Tooth displacement increased SFF and KFF (control < LD < GD, all P < 0.001) and reduced SSP frequency (control > [LD, GD], P < 0.01). Vibration reduced SFF, KFF, and SSP amplitude in the control group (P < 0.05, P < 0.05, and P < 0.001, respectively), but not in the LD and GD groups. SSP frequency was increased by vibration in the control, LD, and GD groups (all P < 0.001), and it was lower in the LD and GD groups than in the control group (P < 0.01). Conclusions: When conventional brackets and a 0.018-inch Cu-NiTi archwire were used in the tooth displacement conditions (LD and GD), vibration did not significantly reduce SFF, KFF, or SSP amplitude.

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Effect of bracket bevel design and oral environmental factors on frictional resistance

Cited by 26 publications

References 27 publications

Lubricating conditions: effects on friction between orthodontic brackets and archwires with different cross-sections

Lubricating conditions: effects on friction between orthodontic brackets and archwires with different cross-sections

The effect of the titanium nitride coating on bacterial adhesion on orthodontic stainless steel wires: in vivo study

Effect of tooth displacement and vibration on frictional force and stick-slip phenomenon in conventional brackets: a preliminary in vitro mechanical analysis

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