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Protraction headgear compliance and orthognathic surgery in patients with cleft lip and palate

Yi, Cleo (2021) Protraction headgear compliance and orthognathic surgery in patients with cleft lip and palate. Master's Thesis, University of Pittsburgh. (Unpublished)

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Objective: The aim of this study is to assess cephalometric parameters and the need for orthognathic surgery (OS) and its relationship with protraction headgear (PHG) compliance.
Method: 23 patients with nonsyndromic cleft lip and palate and a history of lip and palate repair were treated with PHG and orthodontic treatment. PHG lasted 7.4 months on average and was prescribed with 170-gram elastics worn daily for at least 12 hours. Cephalometric measurements at initial (T1), post-PHG (T2), and pre-surgical or post-orthodontic treatment (T3) of at least age 15 for females and 17 for males and the presence of OS were compared.
Results: 83% (19) of patients reported compliance with therapy. Of those compliant, 68% (13) had OS and 32% (6) did not (p=0.80). Inter-group comparisons between compliant and noncompliant showed no significant differences and between OS and nonOS groups, the nonOS group started with larger nasolabial angles at T1 (p<0.05). At T2, there were no significant cephalometric differences between both groupsets. At T3, compliant patients showed significantly more upper incisor proclination than noncompliant patients. Between OS and nonOS groups, the OS group had significantly decreased ANB, Wits, convexity, and overjet, as well as deeper FMA and larger nasolabial angles at T3 (p<0.05).
Conclusions: Patients compliant with PHG showed no difference in the need for OS compared with those that were not. Compliance with PHG did not create any significant differences, however, after comprehensive orthodontic treatment, compliant patients showed more upper incisor proclination and OS patients with decreased ANB, Wits, convexity, overjet, and FMA, and larger nasolabial angles.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Yi, Cleocjy20@pitt.educjy20
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairSchuster,
Committee MemberBurnheimer, Johnjmb334@pitt.edujmb334
Committee MemberShah, Nileshnhs3@pitt.edunhs3
Date: 7 July 2021
Date Type: Publication
Defense Date: 16 April 2021
Approval Date: 7 July 2021
Submission Date: 8 June 2021
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 44
Institution: University of Pittsburgh
Schools and Programs: School of Dental Medicine > Dental Science
Degree: MDS - Master of Dental Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: cleft lip and palate, protraction headgear, reverse-pull facemask, class III, orthognathic surgery, cephalometrics
Date Deposited: 07 Jul 2021 19:10
Last Modified: 07 Jul 2021 19:10


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