Effects of bite-jumping appliances on mandibular advancement in growing rats: A radiographic study

ABSTRACT

Objective: The aim was to evaluate the effects of the use of mandibular advancement appliances on mandibular growth in growing rats. Materials and Methods: Twenty-four 8-week-old male Wistar albino rats were randomly divided into two experimental groups (12 rats each): Group I was a control group, and Group II was the mandibular advancement appliance group. A functional bite-jumping appliance was used in Group II to promote mandibular advancement. Anatomical changes in the condyle and mandible were evaluated by comparing radiographic results from before and after the study, with angular and linear measurements. Friedman and Mann-Whitney U-tests were used in statistical analysis. Results: According to the radiographic results, the growth of mandibles and condyles in Group II was significantly greater than with the length of the condylar process (A-B) and distance from condyle to menton (A-D) variables (P < 0.05). In addition, Group I showed greater mandibular base growth than did Group II (P < 0.05). Conclusions: We conclude that the use of an intraoral bite-jumping appliance can stimulate condylar growth and increase sagittal mandibular advancement in growing rats.

Key words:

Bite-jumping appliance - mandibular advancement - rat condyle

• REFERENCES

• 1 El-Bialy T, El-Shamy I, Graber TM. Growth modification of the rabbit mandible using therapeutic ultrasound: Is it possible to enhance functional appliance results?. Angle Orthod 2003; 73: 631-9
• 2 Bishara SE, Ziaja RR. Functional appliances: A review. Am J Orthod Dentofacial Orthop 1989; 95: 250-8
• 3 Patel HP, Moseley HC, Noar JH. Cephalometric determinants of successful functional appliance therapy. Angle Orthod 2002; 72: 410-7
• 4 Panigrahi P, Vineeth V. Biomechanical effects of fixed functional appliance on craniofacial structures. Angle Orthod 2009; 79: 668-75
• 5 Owtad P, Potres Z, Shen G, Petocz P, Darendeliler MA. A histochemical study on condylar cartilage and glenoid fossa during mandibular advancement. Angle Orthod 2011; 81: 270-6
• 6 Xiong H, Hägg U, Tang GH, Rabie AB, Robinson W. The effect of continuous bite-jumping in adult rats: A morphological study. Angle Orthod 2004; 74: 86-92
• 7 Taira K, Iino S, Kubota T, Fukunaga T, Miyawaki S. Effects of mandibular advancement plus prohibition of lower incisor movement on mandibular growth in rats. Angle Orthod 2009; 79: 1095-101
• 8 Rabie AB, Leung FY, Chayanupatkul A, Hägg U. The correlation between neovascularization and bone formation in the condyle during forward mandibular positioning. Angle Orthod 2002; 72: 431-8
• 9 Gungor AY, Turkkahraman H, Yilmaz HH, Yariktas M. Cephalometric comparison of obstructive sleep apnea patients and healthy controls. Eur J Dent 2013; 7: 48-54
• 10 Killiany DM, Johnson ON, Johnston Jr LE. Combined cephalometric and transcranial radiography of the rat condyle. Angle Orthod 1987; 57: 162-7
• 11 Ghafari J, Degroote C. Condylar cartilage response to continuous mandibular displacement in the rat. Angle Orthod 1986; 56: 49-57
• 12 Rabie AB, Zhao Z, Shen G, Hägg EU, Dr O, Robinson W. Osteogenesis in the glenoid fossa in response to mandibular advancement. Am J Orthod Dentofacial Orthop 2001; 119: 390-400
• 13 Charlier JP, Petrovic A, Herrmann-Stutzmann J. Effects of mandibular hyperpropulsion on the prechondroblastic zone of young rat condyle. Am J Orthod 1969; 55: 71-4
• 14 Liu C, Kaneko S, Soma K. Effects of a mandibular lateral shift on the condyle and mandibular bone in growing rats. Angle Orthod 2007; 77: 787-93