Impact of bone quality, implant type, and implantation site preparation on insertion torques of mini-implants used for orthodontic anchorage

Wilmes, Benedict; Drescher, Dieter

doi:10.1016/j.ijom.2010.08.008

Cited by 107 publications

(76 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In this region, a mini-implant of 6 mm should be sufficient, 1 and the consequent higher insertion torque moment could even call for predrilling in order to decrease the risk of implant fracture or secondary implant failure. 24,25 The relatively short distance to the maxillary sinus from the outer alveolar cortical bone found in the present study implies a risk of perforation of the maxillary sinus if mini-implants are planned for insertion with an apical inclination. A recent study 10 measured the bone depth perpendicular to the bone a The 90u and 45u indicate the degrees at which measurements were performed in relation to the long axis of the teeth at the mid-root level.…”

Section: Discussionmentioning

confidence: 75%

An evaluation of insertion sites for mini-implants

Laursen

Melsen

Cattaneo

2012

The Angle Orthodontist

View full text Add to dashboard Cite

Objective: (1) To report the thickness of the cortical bone in insertion sites commonly used for orthodontic mini-implants, (2) to assess the impact of a change in insertion angle on primary cortical bone-to-implant contact, and (3) to evaluate the risk of maxillary sinus perforation. Materials and Methods: At autopsy, 27 human samples containing three to five adjacent teeth were excised and scanned using a table-top micro-computed tomography system. Bone thickness measurements were taken at 45u and 90u to the long the axis of the adjacent teeth, simulating a mini-implant insertion at the mid-root level. Results: In the maxilla, the overall mean cortical thickness at 90u was 0.7 mm buccally in the lateral region, 1.0 mm buccally in the anterior region, and 1.3 mm palatally. In the mandible, the mean cortical thickness was 0.7 mm buccally and 1.8 mm lingually in the anterior region; 1.9 mm buccally and 2.6 mm lingually in the lateral region. Changing the insertion angle from 90u to 45u increased the cortical bone-to-implant contact by an average of 47%. Perpendicular insertion at the mid-root level only rarely interfered with the sinus, whereas apically inclined insertion increased the risk of sinus perforation. Conclusions: Buccally and palatally in the maxilla and buccally in the anterior mandible, the thickness of the alveolar cortical bone is often less than 1 mm. In contrast, the alveolar cortical bone is frequently thicker than 2 mm laterally in the mandible. Changing the insertion angle to 45u will generally enhance implant stability but increase the risk of perforation to the maxillary sinus. (Angle Orthod. 2013;83:222-229.)

show abstract

Section: Discussionmentioning

confidence: 75%

An evaluation of insertion sites for mini-implants

Laursen

Melsen

Cattaneo

2012

The Angle Orthodontist

View full text Add to dashboard Cite

show abstract

“…The ability to hold the screw in the bone is defined by parameters such as: 1. tightening torque and 2. pull out force. Experimental studies have revealed a positive correlation between these two variables and the thickness and density of the cortical plate and density of the cancellous bone, [21][22][23][24] further supported by the results of research on human cadavers. 25 Motoyoshi et al have established that the critical thickness ensuring sufficient primary stability is 1 mm.…”

Section: Bone Anatomy and Histologymentioning

confidence: 64%

Fundamental factors related to orthodontic micro-implant stability: Review of the literature

Łyczek¹,

Antoszewska-Smith²

2017

Dent. Med. Probl.

View full text Add to dashboard Cite

The development and introduction of temporary intraoral anchorage devices (TISAD) in the beginning of the 21 st century had a great impact on contemporary orthodontics. The enhancement of the scope of orthodontic treatment, improved efficiency, reduction of both the treatment time and need for the patient's compliance, all of these are the crucial advantages the TISAD have provided to our profession. However, there are also some limiting factors pertaining to this anchorage reinforcement technique which must be borne in mind prior to clinical application. Among some others, premature failure of the micro-implants is the most significant problem related to their utilization, as it entails a repetition of the insertion procedure, increasing the cost and duration of treatment and causing the patient's discomfort. Therefore, recognition of the factors related to the stability of orthodontic micro-implants is necessary for their efficient clinical application and maximum survival rates. Since over the last decade there has been noteworthy progress in the research investigating the issue of micro-implant stability, a review of the most current literature pertaining to this topic was the aim of our article, and ultimately providing clinical recommendations.

show abstract

“…12,13 Predrilling reduces miniimplant insertion torque, especially with larger-diameter drills. 2,4,14 Insertion torque also decreases as the predrilling depth increases, with the reduction being most pronounced within the cortical layer. Mini-implant stability can be assessed using insertion and removal torques, pullout strength, the Periotest, and resonance frequency analysis; however, insertion torque appears to be the most reliable and relevant measure of primary stability.…”

Section: Introductionmentioning

confidence: 99%

“…A positive relationship between cortical bone depth and insertion torque has been demonstrated by a number of studies. [2][3][4][5][6] Insertion and removal torque have also been reported to increase significantly with increased bone density in homogeneous artificial bone. Mini-implant design features (eg, body diameter and shape) have been reported to affect primary stability, with insertion torque reported to be higher for tapered than for cylindrical mini-implants.…”

Section: Introductionmentioning

confidence: 99%

An in vitro study of factors affecting the primary stability of orthodontic mini-implants

Holm

Cunningham

Petrie

et al. 2012

The Angle Orthodontist

View full text Add to dashboard Cite

Objectives: To evaluate the effects of mini-implant features (length, design, core diameter), insertion technique (insertion angle, cortical punch), and cortical bone depth and density on miniimplant primary stability. The effect of mini-implant reinsertion was also investigated. Materials and Methods: Two hundred and sixty Infinitas mini-implants of two lengths (9 mm and 6 mm), two core diameters (0.8 mm and 0.9 mm) for an external diameter of 1.5 mm, and four designs (two tapered, external diameter 1.5 mm; two cylindrical, external diameters 1.5 mm and 2.0 mm) were inserted into synthetic bone blocks, and the maximum insertion torque (MIT) was recorded. The cortical layer of the blocks varied in density (30 and 50 lb per cubic foot) and depth (1 mm and 2 mm). Three angles of insertion (90u, 75u, and 60u) and two methods of insertion (direct and cortical punch) were tested. Forty mini-implants were also removed and reinserted. Results: A significant increase in the average MIT occurred when cortical bone density increased and when mini-implants were reinserted. The 1.5 mm diameter cylindrical design had significantly lower MIT than the 1.5 mm tapered and the 2.0 mm cylindrical designs. The other variables did not have a significant effect on MIT. Conclusions: Mini-implants achieved greater primary stability in higher-density cortical bone, and the 1.5 mm diameter tapered and 2.0 mm cylindrical designs offered greater primary stability than the 1.5 mm cylindrical design. Reinserting mini-implants resulted in significantly increased MIT, possibly because of blunting of the threads.

show abstract

Impact of bone quality, implant type, and implantation site preparation on insertion torques of mini-implants used for orthodontic anchorage

Cited by 107 publications

References 23 publications

An evaluation of insertion sites for mini-implants

An evaluation of insertion sites for mini-implants

Fundamental factors related to orthodontic micro-implant stability: Review of the literature

An in vitro study of factors affecting the primary stability of orthodontic mini-implants

Contact Info

Product

Resources

About