Load-related implant reaction of mini-implants used for orthodontic anchorage.

The purpose of this study was to determine the clinical and biomechanical outcome of two different titanium mini-implant systems activated with different load regimens. A total of 200 mini-implants (102 Abso Anchor and 98 Dual Top) were placed in the mandible of eight Göttinger minipigs. Two implants each were immediately loaded in opposite direction by various forces (100, 300 or 500 cN) through tension coils. Additionally, three different distances between the neck of the implant and the bone rim (1, 2 and 3 mm) were used. The different load protocols were chosen to evaluate the load-related implant performance. The load was provided by superelastic tension coils, which are known to develop a virtually constant force. Non-loaded implants were used as a reference. Following an experimental loading period of 22 and 70 days half of the minipigs were sacrificed, and implant containing bone specimens evaluated for clinical performance and implant stability. Implant loosing was found to be statistically dependent on the tip moment (TM) at the bone rim. Clinical implant loosing were only present when load exceeded 900 cN mm. No movement of implants through the bone was found in the experimental groups, for any applied loads. Over the two experimental periods the non-loaded implants of one type of implant had a higher stability than those of the loaded implants. Dual Top implants revealed a slightly higher removal torque compared with Abso Anchor implants. Based on the results of this study, immediate loading of mini-implants can be performed without loss of stability when the load-related biomechanics do not exceed an upper limit of TM at the bone rim.

[1]  D. Tarnow,et al.  Factors affecting implant mobility at placement and integration of mobile implants at uncovering. , 1998, Journal of periodontology.

[2]  Christoph Bourauel,et al.  Bone loading pattern around implants in average and atrophic edentulous maxillae: a finite-element analysis. , 2001, Journal of maxillofacial surgery.

[3]  H. Wehrbein,et al.  Orthodontic anchorage capacity of short titanium screw implants in the maxilla. An experimental study in the dog. , 1997, Clinical oral implants research.

[4]  S. Ferguson,et al.  Biomechanical comparison of the sandblasted and acid-etched and the machined and acid-etched titanium surface for dental implants. , 2002, Journal of biomedical materials research.

[5]  Shouichi Miyawaki,et al.  Factors associated with the stability of titanium screws placed in the posterior region for orthodontic anchorage. , 2003, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[6]  U. Joos,et al.  Microstructural investigations of strain-related collagen mineralization. , 2001, The British journal of oral & maxillofacial surgery.

[7]  F. Isidor,et al.  Histological evaluation of peri-implant bone at implants subjected to occlusal overload or plaque accumulation. , 1997, Clinical oral implants research.

[8]  U. Joos,et al.  Strain-related bone remodeling in distraction osteogenesis of the mandible. , 1999, Plastic and reconstructive surgery.

[9]  W M Smalley,et al.  Osseointegrated titanium implants for maxillofacial protraction in monkeys. , 1988, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[10]  R. Kohal,et al.  Changes in peri-implant tissues subjected to orthodontic forces and ligature breakdown in monkeys. , 1998, Journal of periodontology.

[11]  S. Szmukler‐Moncler,et al.  Timing of loading and effect of micromotion on bone-dental implant interface: review of experimental literature. , 1998, Journal of biomedical materials research.

[12]  H. Wehrbein,et al.  Endosseous titanium implants during and after orthodontic load--an experimental study in the dog. , 1993, Clinical oral implants research.

[13]  H. Wehrbein,et al.  Das Orthosystem — Ein neues Implantatsystem zur orthodontischen Verankerung am Gaumen , 1996, Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie.

[14]  R K Gongloff,et al.  Rigid endosseous implants for orthodontic and orthopedic anchorage. , 1989, The Angle orthodontist.

[15]  Nilgün Akin-Nergiza,et al.  Reactions of peri-implant tissues to continuous loading of osseointegrated implants. , 1998 .

[16]  P. Branemark,et al.  Osseointegrated titanium implants--a new approach in orthodontic treatment. , 1988, European journal of orthodontics.

[17]  P. Diedrich,et al.  Motivation und Erfolgsbeurteilung erwachsener Patienten zur kieferorthopädischen Behandlung-Interpretation einer Befragung , 1990, Fortschritte der Kieferorthopädie.

[18]  F. Isidor,et al.  Loss of osseointegration caused by occlusal load of oral implants. A clinical and radiographic study in monkeys. , 1996, Clinical oral implants research.

[19]  A. Clark,et al.  Studies on the efficacy of implants as orthodontic anchorage. , 1983, American journal of orthodontics.

[20]  W R Krause,et al.  FINITE ELEMENT ANALYSIS OF INTERFACE GEOMETRY EFFECTS ON THE CRESTAL BONE SURROUNDING A DENTAL IMPLANT , 1992, Implant dentistry.

[21]  U. Joos,et al.  Interface reaction at dental implants inserted in condensed bone. , 2005, Clinical oral implants research.

[22]  P Diedrich,et al.  The Orthosystem--a new implant system for orthodontic anchorage in the palate. , 1996, Journal of orofacial orthopedics = Fortschritte der Kieferorthopadie : Organ/official journal Deutsche Gesellschaft fur Kieferorthopadie.

[23]  H. Wiesmann,et al.  IDENTIFICATION OF APOPTOTIC CELL DEATH IN DISTRACTION OSTEOGENESIS , 1999, Cell biology international.

[24]  U. Joos,et al.  Biological and biomechanical evaluation of bone remodelling and implant stability after using an osteotome technique. , 2004, Clinical oral implants research.

[25]  Gero Kinzinger,et al.  The Anchorage Quality of Mini-implants towards Translatory and Extrusive Forces , 2003, Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie.

[26]  C. Goodacre,et al.  Rigid implant anchorage to close a mandibular first molar extraction site. , 1994, Journal of clinical orthodontics : JCO.

[27]  H. Wehrbein,et al.  Enossale Titanimplantate als orthodontische Verankerungselemente , 1994, Fortschritte der Kieferorthopädie.

[28]  H. Frost,et al.  A brief review for orthopedic surgeons: Fatigue damage (microdamage) in bone (its determinants and clinical implications) , 1998, Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association.

[29]  L. Borchers,et al.  Three-dimensional Stress Distribution Around a Dental Implant at Different Stages of Interface Development , 1983, Journal of dental research.

[30]  U. Joos,et al.  Ultrastructural characterization of the implant/bone interface of immediately loaded dental implants. , 2004, Biomaterials.

[31]  H. Hansson,et al.  Osseointegrated titanium implants. Requirements for ensuring a long-lasting, direct bone-to-implant anchorage in man. , 1981, Acta orthopaedica Scandinavica.

[32]  P I Brånemark,et al.  A 15-year study of osseointegrated implants in the treatment of the edentulous jaw. , 1981, International journal of oral surgery.

[33]  H. Tsuru,et al.  The effects of early occlusal loading on one-stage titanium alloy implants in beagle dogs: a pilot study. , 1993, The Journal of prosthetic dentistry.