Effects of mandibular protraction appliance-IV in the treatment of class II malocclusion: A cephalometric investigation

Jena, Ashok Kumar; Duggal, Ritu; Panda, Sujit

doi:10.1016/s0970-2199(10)44001-1

Cited by 1 publication

(3 citation statements)

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“…This reciprocal force will cause retraction of the maxillary central incisors and changes the relation of the lower lips to the upper lips. 10 Khoja et al reported that Z angle increased when compared between treatment and control group and the results are significant. 21 Similar results were reported in Turkey, whereby the Z angle showed significant difference before and after Twin Block treatment.…”

Section: Discussionmentioning

confidence: 95%

“…However, many researchers reported no restraint in the maxilla forward growth therefore it is not a major factor in functional appliance therapy. 10 A significant lengthening of the mandible can be achieved when a functional appliance therapy is performed at pubertal or immediately postpubertal periods of skeletal development. Recent study reported that functional appliance therapy indicated at pubertal spurt followed by fixed appliance is very successful in treating patients with unfavorable Class II malocclusion.…”

Section: Discussionmentioning

confidence: 99%

“…Twin Block appliance has greater skeletal effect in molar correction and overjet reduction in comparison to Mandibular Protraction Appliance-IV (MPA-IV). 10 The Twin Block appliance has gained popularity in the United Kingdom. It consists of upper and lower separable acrylic blocks trimmed to an angle of 70 degrees.…”

Section: Discussionmentioning

confidence: 99%

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Changes in soft tissue facial profile of class II skeletal malocclusion patients with retrognathic mandible treated with twin block appliance

2019

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Introduction: The soft tissue aspect in orthodontics treatment has gained attention in the last few years. The soft tissue profile is said to reflect the underlying skeletal profile, which causes a convex profile in patients with class II skeletal malocclusion. This research was aimed to determine the changes in the soft tissue facial profile of class II skeletal malocclusion patients with retrognathic mandible after twin block treatment. Methods: The type of research used in this study was retrospective descriptive research with paired t-test. The population was children aged 10-13 years old with class II skeletal malocclusion that were treated with twin block appliance in the Faculty of Dentistry Universitas Padjadjaran, Indonesia. The results of soft tissue changes before and after twin block treatment were compared. Results: There was an insignificant increase in soft tissue profile angle and Holdaway’s soft tissue angle after twin block treatment (p > 0.05). Whereas, Holdaway’s H-angle was decreasing and Merrifield’s Z-angle was increasing after twin block treatment, with statistically significant difference (p < 0.05). Conclusion: There was a decrease of H-angle, indicates a reduction in facial convexity and improvement of the facial profile after twin block treatment, but no difference in soft tissue profile angle and Holdaway’s soft tissue angle after twin block treatment. Keywords: Facial soft tissue profile, class II skeletal malocclusion, retrognathic mandible, twin block appliance

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%