Effects of thread depth, taper shape, and taper length on the mechanical properties of mini-implants

Chang, Jenny Zwei-Chieng; Chen, Yi-Jane; Tung, Yuan-Yi; Chiang, Yu-Ying; Lai, Eddie Hsiang-Hua; Chen, Weng-Pin; Lin, Chang‐Ching

doi:10.1016/j.ajodo.2011.09.008

Cited by 90 publications

(74 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The maintenance of the screw stability after 5 weeks under an immediate static load of 2 N demonstrated an adequate device stability to support grouped teeth movements during dental treatments. The screw placement torque of the present work was in line with the literature and was considered safe to prevent the transmission of excessive strains and the appearance of cracks, which contribute to the reduction of the device stability [4,30].…”

Section: Discussionsupporting

confidence: 69%

“…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%

“…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%

“…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%

See 3 more Smart Citations

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

Fernandes

Barbosa

Ferreira

et al. 2017

Metals

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionsupporting

confidence: 69%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Fernandes

Barbosa

Ferreira

et al. 2017

Metals

View full text Add to dashboard Cite

show abstract

“…19,20 Kwon et al 19 did not find significant mechanical and histological differences, in terms of removal torque and bone/implant contact, when comparing implants with and without microthreads. However, Chang et al, 20 using mechanical and finite element analysis, concluded that modification of MI design can affect mechanical properties, improving primary stability. The authors observed high stresses on the uppermost thread at the neck of MI near the margin of the bone.…”

Section: Declaration Of Interestsmentioning

confidence: 99%

Influence of cortical thickness on the stability of mini-implants with microthreads

et al. 2015

View full text Add to dashboard Cite

The objective of this study was to assess the influence of cortical thickness and bone density on the insertion torque of a mini-implant (MI) with microthreads. Mini-implants with lengths of 6 and 8 mm in the active part were inserted into synthetic bone blocks (polyurethane resin). The density of these blocks was 20 pounds per cubic foot (pcf), simulating bone marrow, and that of blocks 1, 2, and 3-mm-thick blocks was 40 pcf, simulating cortical bone. Blocks with uniform density of 40 pcf were also used to simulate bone areas of greater density. Insertion torque was quantified with a universal testing machine (EMIC). For both MIs, increasing insertion torque was associated with increasing cortical bone thickness. For the same MI length, significant differences were observed among all assessed groups. The insertion torque of the 6-mm-long MI inserted in a 3-mm-thick cortical bone was equivalent to that of the 8-mm-long MI inserted in a 1-mm-thick cortical bone. MIs inserted in bone blocks of greater density presented insertion torque values almost twice as high as those in other groups. The shorter MI, the lower the insertion torque, and the greater the cortical bone thickness, the greater the insertion torque. To minimize fracture risk, the size of MI should be selected according to the insertion site.

show abstract

Maximising Mini‐Implant Success: Design Factors

Cousley

2013

The Orthodontic Mini‐Implant Clinical Handbook

View full text Add to dashboard Cite

Effects of thread depth, taper shape, and taper length on the mechanical properties of mini-implants

Cited by 90 publications

References 24 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

Influence of cortical thickness on the stability of mini-implants with microthreads

Maximising Mini‐Implant Success: Design Factors

Contact Info

Product

Resources

About