Ultraviolet photofunctionalization increases removal torque values and horizontal stability of orthodontic miniscrews

Tabuchi, Masako; Ikeda, Takayuki; Nakagawa, Kahori; Hirota, Makoto; Park, Won-Hee; Miyazawa, Ken; Goto, Shigemi; Ogawa, Takahiro

doi:10.1016/j.ajodo.2015.03.022

Cited by 23 publications

(22 citation statements)

References 33 publications

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“…This torsional moment is analyzed in terms of the placement torque, mainly in situations where a non-osseointegration device response is planned for temporary purposes [4,5,[15][16][17][18][22][23][24][25]. In this work, torque values were measured before and after two different loads conditions with different intensities.…”

Section: Discussionmentioning

confidence: 99%

“…Screw design is dependent of threads and its diameters, shape (geometry, depth, and pitch), self-drilling or self-tapping ability and screw body that might have tapered or cylindrical shape [4,5]. Regarding influence of host tissue in stability, it is mainly ruled by bone features, its elastic modules compatibility with screw alloy, and the thickness, quality and density of cortical and cancellous bone.…”

Section: Introductionmentioning

confidence: 99%

“…In maxillofacial region, different works showed that failures in temporary screws due to its stability loss occurred when screws were placed in the thickest and densest cortical areas available, as observed in the posterior buccal region of a mandible [10][11][12][13]. Innumerous works used placement torque as an adequate method to evaluate the immediate stability after screw insertion [4,5,[14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Primary Stability of Temporary Screws after Dentary and Orthopedic Forces under Static and Dynamic Load Cycles

Fernandes

Barbosa

Ferreira

et al. 2017

Metals

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Abstract:The objective was to analyze the influence of dentary and orthopedic forces under static and dynamic loads in temporary screw stability. Self-drilling titanium (Ti6Al4V) screws (6 × 1.5 mm) were inserted and removed from pig ribs. Screws were loaded by static loads of 2 N and 5 N for 5 weeks. Dynamic force was applied during 56,000 cycles for simulations of a patient's opening-closing mouth movements. Dynamic applied loads ranged from 2 to 5 N and from 5 to 7 N under a frequency of 1 Hz.Torque peak values at placement and removal were measured before and after static and dynamic cycles. Similarities in torque peaks (p = 0.3139) were identified at placement (12.54 Ncm) and removal (11.2 Ncm) of screws after a static load of 2 N. Statistical comparisons showed significant stability loss after dynamic cycles under loads of 2 N (64.82% at p = 0.0005) and 5 N (64.63% at p = 0.0026). Limited stability loss occurred in temporary screws submitted to 2 N static forces (p = 0.3139). The detrimental effects of dynamic cycles in temporary screws stability was attested after the simulation of dentary and skeletal forces, being intermittent forces more relevant in the loss of mechanical stability.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Primary Stability of Temporary Screws after Dentary and Orthopedic Forces under Static and Dynamic Load Cycles

Fernandes

Barbosa

Ferreira

et al. 2017

Metals

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“…In the past, Ogawa 9) reported that machine surface implants treated with ultraviolet light developed a unique electrostatic characteristic, acting as direct cell attractants to effectively reduce the osseointegration period without the aid of ionic or organic bridges, which is a novel physicochemical characteristic of titanium 10) . Ultraviolet photofunctionalization has also been reported to improve the bone-to-implant contact ratio 11) .…”

Section: Introductionmentioning

confidence: 99%

Effect of a Dietary Supplement on Peri-Implant Bone Strength in a Rat Model of Machined Surface Implants

Sato

Watanabe

Takahashi

et al. 2019

J. Hard Tissue Biology.

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Efforts to improve the bone-implant interface to accelerate and improve the quality of osseointegration have generally focused on chemically improving the interface by incorporating inorganic phases on or into the titanium oxide layer or physically improving it by increasing the level of roughness. However, some types of rough-surfaced implants, such as those coated with hydroxyapatite (HA), may result in a higher incidence of complications. Once peri-implantitis occurs, the factors promoting bone integration can turn into risk factors, exacerbating inflammation around the implant fixture. Thus, it is extremely important to study approaches for accelerating bone formation around the machined surface dental implants. Peri-implant bone formation may be enhanced by systemic approaches, such as the use of osteoporosis supplements, to promote bone metabolism. The present study aimed to investigate if peri-implant bone mineral density (BMD) was improved after oral synthetic bone mineral (SBM) intake, which facilitates improved secondary stability of the machined surface dental implants and shortens the healing period. Twenty-four 7-week-old female Wistar rats were randomly assigned to receive a standardized diet with or without SBM (diet with SBM group and diet without SBM group, respectively; n = 12 for both). The rats underwent implant surgery at 9 weeks of age under general anesthesia. The main outcome measures BMD, pull-out strength, real-time PCR and Fluorescence microscopy observations of the implant from the femur were compared at 2 and 4 weeks after implantation using the Mann-Whitney U test. At 2 and 4 weeks after implantation, BMD, pull-out strength, real-time PCR and fluorescence microscopy observations were both significantly greater in the diet with SBM group than in the diet without SBM group. This study demonstrated that SBM could be effective in accelerating peri-implant bone formation for machined surface implants during the healing period after implantation.

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“…These effects are due to decomposition and removal of carbon compounds (such as hydrocarbons) from the Ti surface during photofunctionalization (10)(11)(12). UV treatment of Ti mesh eliminates carbon species from the Ti surface and makes it superhydrophilic, which may improve osteoconductivity (13)(14)(15)(16)(17)(18). Furthermore, the clinical use of photofunctionalization has yielded positive results in dental implants (19)(20)(21)(22)(23).…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet treatment restores bioactivity of titanium mesh plate degraded by contact with medical gloves

Okubo

Tsukimura

Taniyama³

et al. 2018

Journal of Oral Science

Self Cite

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Titanium mesh plate (Ti mesh) used for bone augmentation inadvertently comes into contact with medical gloves during trimming and bending. We tested the hypotheses that glove contact degrades the biological capability of Ti mesh and that ultraviolet treatment (UV) can restore this capability. Three groups of Ti mesh specimens were prepared: as-received (AR), after glove contact (GC), and after glove contact followed by UV treatment. The AR and GC meshes were hydrophobic, but GC mesh was more hydrophobic. AR and GC meshes had significant amounts of surface carbon, and Si content was higher for GC mesh than for AR mesh. UV mesh was hydrophilic, and carbon and silicon content values were significantly lower in this group than in the AR and GC groups. The number, alkaline phosphatase activity, and mineralization ability of attached osteoblasts were significantly lower in the GC group than in the AR group and markedly higher in the UV group than in the AR group. In conclusion, glove contact caused chemical contamination of Ti mesh, which significantly reduced its bioactivity. UV treatment restored bioactivity in contaminated Ti mesh, which outperformed even the baseline Ti mesh.

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Ultraviolet photofunctionalization increases removal torque values and horizontal stability of orthodontic miniscrews

Cited by 23 publications

References 33 publications

Primary Stability of Temporary Screws after Dentary and Orthopedic Forces under Static and Dynamic Load Cycles

Primary Stability of Temporary Screws after Dentary and Orthopedic Forces under Static and Dynamic Load Cycles

Effect of a Dietary Supplement on Peri-Implant Bone Strength in a Rat Model of Machined Surface Implants

Ultraviolet treatment restores bioactivity of titanium mesh plate degraded by contact with medical gloves

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