EFFECTS OF INSERTION ANGLE AND BODY SHAPE ON THE PRIMARY STABILITY OF ORTHODONTIC MINISCREWS*

Year 2025, Volume: 34 Issue: 1, 113 - 120, 07.04.2025

Cansu Düzgün , Serdar Toroğlu

https://doi.org/10.34108/eujhs.1433626

Abstract

In this study, we aimed to analyze the maximum insertion torque, pull-out and shear strength of the samebrand mini screws with different body structures that were inserted at 30°,45°,60°and, 90° in order to compare their stability. The study consisted of 144 self-drilling, 1.4×8 mm titanium alloy minis crews (Abso-Anchor conical, Abso-Anchor cylindrical). Each group of mini screws were inserted in fresh male bovine hip bone segments at four different angles and the maximum insertion torque was recorded. Pull-out and shear force resistance values were measured and recorded until 1.5 mm displacement occurred. The data was analyzed with the use of the IBM SPSS program. Statistical analyses were conducted with Shapiro-Wilk, One-Way ANOVA, Tukey HSD and Student's t-test. It was determined that the maximum insertion torque and force resistance values of the conical mini screws and an insertion angle of 45° were significantly higher than those of the other groups. The Abso-Anchor conical group was the most resistant to failure. To achieve the best primary stability, the use of aconical shape is advisable. The insertion angle of 45° is more favorable than excessive oblique or vertical angles.

Keywords

Mini screw, primary stability, pull-out test, shear test

Project Number

THD-2017-8555

ORTODONTİK MİNİ VİDALARIN YERLEŞTİRME ANGULASYONUNUN VE GÖVDE YAPISININ PRİMER STABİLİTEYE ETKİSİ

Abstract

Çalışmanın amacı 30°, 45°, 60° ve 90° de yerleştirilmiş, aynı markanın farklı gövde yapısına sahip mini vidalarının maksimum yerleştirme torkunu, pull-out ve shear kuvvet dayanımını ölçmek ve stabilitelerini karşılaştırmaktır. Çalışmada 1.4×8 mm ebatlarında toplamda 144 tane titanyumalaşım, self-drilling mini vida (Abso-Anchor konik, Abso-Anchor silindirik) kullanılmıştır. Her iki grup dört farklı açıda yerleştirilmiş ve maksimum yerleştirme torkları kaydedilmiştir. Daha sonra vidalara pull-out ve shear kuvvet testleri, vida başı 1.5 mm yer değiştirinceye kadar uygulanmış ve gösterdikleri kuvvet dayanımları Ncm cinsinden kaydedilmiştir. Veriler IBM SPSS programıyla analiz edilmiştir. İstatistiksel analizler; Shapiro-Wilk, tek yönlü Anova, Tukey HDS ve Student t testleriyle yapılmıştır. En fazla maksimum yerleştirme tork değeri ve kuvvet dayanımı, konik gövde yapısı ve 45° yerleştirme açısında görülmüştür. Abso-Anchor konik grubu primer stabilite yönünden diğer gruptan daha başarılı bulunmuştur. En yüksek primer stabilite için konik gövde yapısı tavsiye edilmektedir. 45° yerleştirme açısı, aşırı eğimli veya dik açılara göre daha uygundur.

Keywords

Mini vida, primer stabilite, pull-out test, shear test

Project Number

THD-2017-8555

References

• Reynders R, Ronchi L, Bipat S. Mini-implants in orthodontics: a systematic review of the literature. Am J Orthod Dentofacial Orthop. 2009;135(5):564.e1-564.e19. doi:10.1016/J.AJODO.2008.09.026
• Sana S, Reddy R, Talapaneni AK, Hussain A, Bangi SL, Fatima A. Evaluation of stability of three different mini-implants, based on thread shape factor and numerical analysis of stress around mini-implants with different insertion angle, with relation to en-masse retraction force. Dental Press J Orthod. 2020;25(6):59-68. doi:10.1590/2177-6709.25.6.059-068.OAR
• Yu WP, Yu JH, Wang SH, Hsu JT. The Effects of Diameter, Length and Insertion Method on the Stability of Orthodontic Miniscrew. J Med Biol Eng. 2022;42(4):508-515. doi:10.1007/S40846-022-00737-0
• Mohan S, Srinivasan D, Arumugam E, Devasahayam D, Kannan R. Effect of placement angle, diameter, length and bone density on the pull-out strength of orthodontic mini-implants: An in vitro study. J Orthod. 2022;49(2):143-150. doi:10.1177/14653125211053338
• Chen Y, Kyung HM, Zhao WT, Yu WJ. Critical factors for the success of orthodontic mini-implants: A systematic review. Am J Orthod Dentofac Orthop. 2009;135(3):284-291. doi:10.1016/J.AJODO.2007.08.017/
• Araghbidikashani M, Golshah A, Nikkerdar N, Rezaei M. In-vitro impact of insertion angle on primary stability of miniscrews. Am J Orthod Dentofac Orthop. 2016;150(3):436-443. doi:10.1016/J.AJODO.2016.02.020/
• Wilmes B, Ottenstreuer S, Su YY, Drescher D. Impact of implant design on primary stability of orthodontic mini-implants. J Orofac Orthop. 2008;69(1):42-50. doi:10.1007/S00056-008-0727-4
• Wilmes B, Rademacher C, Olthoff G, Drescher D. Parameters affecting primary stability of orthodontic mini-implants. J Orofac Orthop. 2006;67(3):162-174. doi:10.1007/S00056-006-0611-Z
• Brinley CL, Behrents R, Kim KB, Sridhar C, Kyung HM, Buschang PH. Pitch and longitudinal fluting effects on the primary stability of miniscrew implants. Angle Orthod. 2009;79(6):1156-1161. doi:10.2319/103108-554R.1
• Drago CJ, Del Castillo RA. A retrospective analysis of osseotite NT implants in clinical practice: 1-year follow-up. Int J Periodontics Restorative Dent. 2006;26(4):337-345. https://pubmed.ncbi.nlm.nih.gov/16939015/. Accessed May 13, 2024.
• Jong-Wan Kim 1, Seung-Hak Baek, Tae-Woo Kim YIC. Comparison of stability between cylindrical and conical type mini-implants. Mechanical and histological properties- PubMed. ( Angle Orthod. 2008;78(4):692-8. doi:10.2319/0003-3219(2008) 078[0692:COSBCA]2.0.CO;2.)
• Cha JY, Kil JK, Yoon TM, Hwang CJ. Miniscrew stability evaluated with computerized tomography scanning. Am J Orthod Dentofacial Orthop. 2010;137(1):73-79. doi:10.1016/J.AJODO.2008.03.024
• Carano A, Lonardo P, Velo S, Incorvati C. Mechanical properties of three different commercially available miniscrews for skeletal anchorage. Prog Orthod. 2005;6(1):82-97. https://pubmed.ncbi.nlm.nih.gov/15891787/. Accessed May 13, 2024.
• Motoyoshi M, Matsuoka M, Shimizu N. Application of orthodontic mini-implants in adolescents. Int J Oral Maxillofac Surg. 2007;36(8):695-699. doi:10.1016/J.IJOM.2007.03.009
• Park HS, Jeong SH, Kwon OW. Factors affecting the clinical success of screw implants used as orthodontic anchorage. Am J Orthod Dentofacial Orthop. 2006;130(1):18-25. doi:10.1016/J.AJODO.2004.11.032
• Deguchi T, Nasu M, Murakami K, Yabuuchi T, Kamioka H, Takano-Yamamoto T. Quantitative evaluation of cortical bone thickness with computed tomographic scanning for orthodontic implants. Am J Orthod Dentofacial Orthop. 2006;129(6):721.e7-721.e12. doi:10.1016/J.AJODO.2006.02.026
• Kyung H-M, Park H-S, Bae S-M, Sung J-H, Kim I-B. Development of orthodontic micro-implants for intraoral anchorage. J Clin Orthod. 2003;37(6):321-328; quiz 314. https://pubmed.ncbi.nlm.nih.gov/12866214/. Accessed May 13, 2024.
• Jariyapongpaiboon P, Chartpitak J. Effect of Angular Insertion of Orthodontic Miniscrews on Primary Stability. Taiwan J Orthod. 2020;32(3). doi:10.38209/2708-2636.1032
• Woodall N, Tadepalli SC, Qian F, Grosland NM, Marshall SD, Southard TE. Effect of miniscrew angulation on anchorage resistance. Am J Orthod Dentofacial Orthop. 2011;139(2). doi:10.1016/J.AJODO.2010.08.017
• Pickard MB, Dechow P, Rossouw PE, Buschang PH. Effects of miniscrew orientation on implant stability and resistance to failure. Am J Orthod Dentofacial Orthop. 2010;137(1):91-99. doi:10.1016/J.AJODO.2007.12.034
• Kim JW, Ahn SJ, Chang Y Il. Histomorphometric and mechanical analyses of the drill-free screw as orthodontic anchorage. Am J Orthod Dentofacial Orthop. 2005;128(2):190-194. doi:10.1016/J.AJODO.2004.01.030
• Cha JY, Yoon TM, Hwang CJ. Insertion and removal torques according to orthodontic mini-screw design. Korean J Orthod. 2008;38(1):5-12. doi:10.4041/KJOD.2008.38.1.5
• Wilmes B, Drescher D. Impact of insertion depth and predrilling diameter on primary stability of orthodontic mini-implants. Angle Orthod. 2009;79(4):609-614. doi:10.2319/071708-373.1
• Evans FG. Springfield CCT. Mechanical properties of bone. In: Evans FG editors., ed.; 1973:p 56-60.
• Uyar V. Yeni geliştirilen mini implant ring aparatının farklı yönlerdeki kuvvetler karşısında minivida stabilitesi ve kuvvet direncine olan etkisi. 2012.
• Redžepagić-Vražalica L, Mešić E, Pervan N, Hadžiabdić V, Delić M, Glušac M. Impact of implant design and bone properties on the primary stability of orthodontic mini-implants. Appl Sci. 2021;11(3):1-10. doi:10.3390/APP11031183
• Tatli U, Alraawi M, Toroğlu MS. Effects of size and insertion angle of orthodontic mini-implants on skeletal anchorage. Am J Orthod Dentofacial Orthop. 2019;156(2):220-228. doi:10.1016/J.AJODO.2018.08.026
• Wu JH, Lu PC, Lee KT, Du JK, Wang HC, Chen CM. Horizontal and vertical resistance strength of infrazygomatic mini-implants. Int J Oral Maxillofac Surg. 2011;40(5):521-525. doi:10.1016/J.IJOM.2011.01.002
• Whang CZY, Bister D, Sherriff M. An in vitro investigation of peak insertion torque values of six commercially available mini-implants. Eur J Orthod. 2011;33(6):660-666. doi:10.1093/EJO/CJQ129
• Wilmes B, Su YY, Drescher D. Insertion angle impact on primary stability of orthodontic mini-implants. Angle Orthod. 2008;78(6):1065-1070. doi:10.2319/100707-484.1
• A C, M R, B M. Miniscrews as orthodontic anchorage: a preliminary report. Int J Adult Orthodon Orthognath Surg. 1998;13(3):201-209. https://pubmed.ncbi.nlm.nih.gov/9835819/. Accessed May 25, 2024.
• Liou EJW, Pai BCJ, Lin JCY. Do miniscrews remain stationary under orthodontic forces? Am J Orthod Dentofac Orthop. 2004;126(1):42-47. doi:10.1016/j.ajodo.2003.06.018
• McManus MM, Qian F, Grosland NM, Marshall SD, Southard TE. Effect of miniscrew placement torque on resistance to miniscrew movement under load. Am J Orthod Dentofacial Orthop. 2011;140(3). doi:10.1016/J.AJODO.2011.04.017
• Brettin BT, Grosland NM, Qian F, et al. Bicortical vs monocortical orthodontic skeletal anchorage. Am J Orthod Dentofacial Orthop. 2008;134(5):625-635. doi:10.1016/J.AJODO.2007.01.031
• Lim SA, Cha JY, Hwang CJ. Insertion torque of orthodontic miniscrews according to changes in shape, diameter and length. Angle Orthod. 2008;78(2):234-240. doi:10.2319/121206-507.1
• Zhao L, Xu Z, Wei X, et al. Effect of placement angle on the stability of loaded titanium microscrews: a microcomputed tomographic and biomechanical analysis. Am J Orthod Dentofacial Orthop. 2011;139(5):628-635. doi:10.1016/J.AJODO.2009.06.040
• Kuroda S, Sugawara Y, Deguchi T, Kyung HM, Takano-Yamamoto T. Clinical use of miniscrew implants as orthodontic anchorage: success rates and postoperative discomfort. Am J Orthod Dentofacial Orthop. 2007;131(1):9-15. doi:10.1016/J.AJODO.2005.02.032
• Park HS, Bae SM, Kyung HM, Sung JH. Micro-implant anchorage for treatment of skeletal Class I bialveolar protrusion. J Clin Orthod. 2001;35(7):417-422. https://pubmed.ncbi.nlm.nih.gov/11494827/. Accessed May 25, 2024.
• Lee KJ, Joo E, Kim KD, Lee JS, Park YC, Yu HS. Computed tomographic analysis of tooth-bearing alveolar bone for orthodontic miniscrew placement. Am J Orthod Dentofacial Orthop. 2009;135(4):486-494. doi:10.1016/J.AJODO.2007.05.019
• Lim JE, Won HL, Yoon SC. Quantitative evaluation of cortical bone thickness and root proximity at maxillary interradicular sites for orthodontic mini-implant placement. Clin Anat. 2008;21(6):486-491. doi:10.1002/CA.20671
• Xu Z, Wu Y, Zhao L, et al. Effect of placement angle on the stability of loaded titanium microscrews in beagle jaws. Angle Orthod. 2013;83(4):659-666. doi:10.2319/081612-660.1