ABSTRACT

Objectives

To investigate the effect of micro-osteoperforation (MOP) on the horizontal and vertical distribution of mandibular trabeculae bone volume fraction in relation to different MOP intervals during canine retraction.

Material and Methods

This single-center, single-blinded, prospective randomized split-mouth clinical trial included 30 healthy participants aged 18 years and older, randomized into three groups of different MOP intervals (4, 8, and 12-weekly). Cone beam computed tomography images were taken to assess the bone volume fraction (bone volume over total volume or BV/TV).

Results

BV/TV was significantly reduced (mean difference: 9.79%, standard deviation [SD]: 11.89%; 95% confidence interval [CI]: 4.77, 14.81%; P < .01) and canine retraction increased (mean difference: -1.25 mm/4 mo, SD: 0.79 mm; 95% CI: -1.59, -0.92 mm; P < .01) with MOP, compared to control sites. MOP significantly changed the vertical and horizontal patterns of trabeculae bone with lower values nearer to intervention sites. Only the 4-weekly MOP interval group showed significant decrease in BV/TV (mean difference: 14.73%, SD: 12.88%; 95% CI: 3.96, 25.50%; P = .01) despite significant increase in canine retraction rate for all interval groups. With the use of MOP, BV/TV was found to be inversely correlated to the rate of canine retraction (r = -0.425; P = .04).

Conclusions

Mandibular trabecular alveolar bone volume fraction was reduced and rate of orthodontic tooth movement increased with MOP, especially in the 4-weekly interval. However, this effect was limited to the immediate interdental region of MOP.

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Author notes

a

Orthodontic Resident, Department of Pediatric Dentistry and Orthodontics, Faculty of Dentistry, University Malaya, Kuala Lumpur, Malaysia.

b

Orthodontic Lecturer, Department of Pediatric Dentistry and Orthodontics, Faculty of Dentistry, University Malaya, Kuala Lumpur, Malaysia.

c

Lecturer, Department of Oral and Maxillofacial Clinical Sciences, Faculty of Dentistry University Malaya, Kuala Lumpur, Malaysia.

d

Associate Professor, Department of Oral and Maxillofacial Clinical Sciences, Faculty of Dentistry University Malaya, Kuala Lumpur, Malaysia.

e

Associate Professor, Department of Pediatric Dentistry and Orthodontics, Faculty of Dentistry, University Malaya, Kuala Lumpur, Malaysia.