Korean J Orthod.  2013 Jun;43(3):120-126. 10.4041/kjod.2013.43.3.120.

Biologic stability of plasma ion-implanted miniscrews

• Cho YC
• Cha JY
• Hwang CJ
• Park YC
• Jung HS
• Yu HS

• KMID: 1975126
• DOI: http://doi.org/10.4041/kjod.2013.43.3.120

Abstract

OBJECTIVE
To gain basic information regarding the biologic stability of plasma ion-implanted miniscrews and their potential clinical applications.
METHODS
Sixteen plasma ion-implanted and 16 sandblasted and acid-etched (SLA) miniscrews were bilaterally inserted in the mandibles of 4 beagles (2 miniscrews of each type per quadrant). Then, 250 - 300 gm of force from Ni-Ti coil springs was applied for 2 different periods: 12 weeks on one side and 3 weeks contralaterally. Thereafter, the animals were sacrificed and mandibular specimens including the miniscrews were collected. The insertion torque and mobility were compared between the groups. The bone-implant contact and bone volume ratio were calculated within 800 microm of the miniscrews and compared between the loading periods. The number of osteoblasts was also quantified. The measurements were expressed as percentages and analyzed by independent t-tests (p < 0.05).
RESULTS
No significant differences in any of the analyzed parameters were noted between the groups.
CONCLUSIONS
The preliminary findings indicate that plasma ion-implanted miniscrews have similar biologic characteristics to SLA miniscrews in terms of insertion torque, mobility, bone-implant contact rate, and bone volume rate.

Keyword

Orthodontic mini-implant; Surface treatment; Histology; Stability

MeSH Terms

Animals
Mandible
Nickel
Osteoblasts
Plasma
Population Characteristics
Titanium
Torque
Nickel
Titanium

Figure

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  Figure 1 Images of a plasma ion-implanted miniscrew (A), an SLA miniscrew (B), and miniscrew insertion (C). After insertion, 250 - 300 gm of force was applied by using a Ni-Ti coil spring.

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  Figure 2 The insertion torque (Ncm) depending on the type of miniscrew. No significant difference was noted between the sandblasted and acid-etched (SLA) and the plasma ion-implanted miniscrews.

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  Figure 3 Change in mobility depending on the type of miniscrew. In the plasma ion-implanted group, the mobility increased up to week 6 and decreased in week 9, but increased again in week 12. In the sandblasted and acid-etched (SLA) group, the mobility increased continuously up to week 12 and then decreased.

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  Figure 4 Histologic images (×100 magnification) of the bone-implant contact according to the loading period in each group. A, Plasma ion planted miniscrew (3 weeks). B, Plasma ion planted miniscrew (12 weeks). C, SLA miniscrew (3 weeks). D, SLA miniscrew (12 weeks). SLA, Sandblasted and acid-etched.

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  Figure 5 Quantification of osteoblasts depending on the type of miniscrew. The 3-week plasma ion-implanted miniscrews showed the highest number of osteoblasts. SLA, Sandblasted and acid-etched.

Reference

1. Wehrbein H, Merz BR, Diedrich P, Glatzmaier J. The use of palatal implants for orthodontic anchorage. Design and clinical application of the orthosystem. Clin Oral Implants Res. 1996. 7:410–416.

2. Park YC, Lee SY, Kim DH, Jee SH. Intrusion of posterior teeth using mini-screw implants. Am J Orthod Dentofacial Orthop. 2003. 123:690–694.

3. Miyawaki S, Koyama I, Inoue M, Mishima K, Sugahara T, Takano-Yamamoto T. Factors associated with the stability of titanium screws placed in the posterior region for orthodontic anchorage. Am J Orthod Dentofacial Orthop. 2003. 124:373–378.

4. Chen CH, Chang CS, Hsieh CH, Tseng YC, Shen YS, Huang IY, et al. The use of microimplants in orthodontic anchorage. J Oral Maxillofac Surg. 2006. 64:1209–1213.

5. Cheng SJ, Tseng IY, Lee JJ, Kok SH. A prospective study of the risk factors associated with failure of mini-implants used for orthodontic anchorage. Int J Oral Maxillofac Implants. 2004. 19:100–106.

6. Büchter A, Wiechmann D, Koerdt S, Wiesmann HP, Piffko J, Meyer U. Load-related implant reaction of mini-implants used for orthodontic anchorage. Clin Oral Implants Res. 2005. 16:473–479.

7. Joos U, Büchter A, Wiesmann HP, Meyer U. Strain driven fast osseointegration of implants. Head Face Med. 2005. 1:6.

8. Huja SS, Litsky AS, Beck FM, Johnson KA, Larsen PE. Pull-out strength of monocortical screws placed in the maxillae and mandibles of dogs. Am J Orthod Dentofacial Orthop. 2005. 127:307–313.

9. Habig KH. Friction and wear of sliding couples coated with TiC, TiN or TiB2. Surf Coat Technol. 1990. 42:133–147.

10. Kim SY, Moon YP, Park GH, Jo HH, Kim WG, Son MK, et al. Surface characteristics and electrochemical behaviors of TiN and ZrN coated orthodontic mini-screw. J Korean Ins Surf Eng. 2008. 41:232–239.

11. Albrektsson T, BråNemark PI, Hansson HA, Lindström J. Osseointegrated titanium implant. Requirements for ensuring a long-lasting, direct bone-to-implant anchorage in man. Acta Orthop Scand. 1981. 52:155–170.

12. Han CH, Johansson CB, Wennerberg A, Albrektsson T. Quantitative and qualitative investigations of surface enlarged titanium and titanium alloy implants. Clin Oral Implants Res. 1998. 9:1–10.

13. Buser D, Schenk RK, Steinemann S, Fiorellini JP, Fox CH, Stich H. Influence of surface characteristics on bone integration of titanium implants. A histomorphometric study in miniature pigs. J Biomed Mater Res. 1991. 25:889–902.

14. Kim HM, Miyaji F, Kokubo T, Nakamura T. Preparation of bioactive Ti and its alloys via simple chemical surface treatment. J Biomed Mater Res. 1996. 32:409–417.

15. Sul YT, Johansson CB, Jeong Y, Wennerberg A, Albrektsson T. Resonance frequency and removal torque analysis of implants with turned and anodized surface oxides. Clin Oral Implants Res. 2002. 13:252–259.

16. Byon E, Moon S, Cho SB, Jeong CY, Jeong Y, Sul YT. Electrochemical property and apatite formation of metal ion implanted titanium for medical implants. Surf Coat Technol. 2005. 200:1018–1021.

17. Wilson AD, Leyland A, Matthews A. A comparative study of the influence of plasma treatments, PVD coatings and ion implantation on the tribological performance of Ti-6Al-4V. Surf Coat Technol. 1999. 114:70–80.