Treatment response and stability of slow maxillary expansion using Haas, hyrax, and quad-helix appliances: A retrospective study

Huynh, Thuylinh; Kennedy, David B.; Joondeph, Donald R.; Bollen, Anne Marie

doi:10.1016/j.ajodo.2007.08.026

Cited by 74 publications

(82 citation statements)

References 31 publications

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“…Maxillary intercanine width increased 4.56 mm (P , .001) and an intermolar width increased 4.32 mm (P , .001) during active expansion (Table 2). This intermolar expansion is less than that reported by Huynh et al 22 because our sample included only UPXB cases, not UPXB and bilateral PXB cases together. These results are comparable to those reported by Bell and LeCompte 11 and Boysen et al, 26 who both used methodologies similar to this study, treating 8-yearold patients with the quad helix appliance and SME.…”

Section: Pretreatment Comparisons (T1)contrasting

confidence: 43%

“…7,[14][15][16][17][18][19][20][21] Since RME studies used fixed appliances post expansion, the effects of pure expansion alone on arch dimensions remain unanswered. [18][19][20][21] Huynh et al 22 demonstrated 84% long-term success in treating early mixed dentition UPXB and bilateral posterior crossbite with their data referring successful and unsuccessful cases. There are no data on arch dimensions after successful early treatment of UPXB.…”

Section: Introductionmentioning

confidence: 99%

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Arch dimension changes from successful slow maxillary expansion of unilateral posterior crossbite

Wong¹,

Sinclair²,

Keim³

et al. 2011

The Angle Orthodontist

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Objective: To evaluate the long-term effects of successful slow maxillary expansion without fixed appliances or retainers in the mixed dentition on patients with unilateral crossbites, using Haastype, hyrax, or quad helix appliances. Materials and Methods: Serial dental casts of 110 patients were evaluated at three time points: preexpansion (T1) (mean age 7 years/7 months), postexpansion (T2) (mean age 8 years/ 8 months), and approximately 4 years later in the permanent dentition (T3) (mean age 12 years/ 9 months). Maxillary and mandibular intercanine and intermolar widths, arch length, and perimeter and molar angulation were measured at all three time intervals with the Michigan published growth norms serving as a control. Results: Successful treatment by slow maxillary expansion (SME) produced similarly favorable expansion by all three expanders in all measurements for both arches. Maxillary arch widths were narrower than controls pretreatment (T1) and wider than controls immediately post treatment (T2). Long-term (T3) maxillary intermolar width was the same as controls, with intercanine width significantly wider than controls. Maxillary intercanine and intermolar width increased from T1 to T3, by 4.5 mm and 3.5 mm, respectively, with 98% of intercanine and 80% of intermolar expansion remaining at T3. Maxillary arch circumference increased by 1 mm from T1 to T3. Mandibular width did not change significantly. Conclusion: Maxillary arch dimensions in early mixed dentition in patients with unilateral posterior crossbite showed good stability 4 years post treatment in the permanent dentition. (Angle Orthod. 2011;81:616-623.)

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Section: Pretreatment Comparisons (T1)contrasting

confidence: 43%

Section: Introductionmentioning

confidence: 99%

Arch dimension changes from successful slow maxillary expansion of unilateral posterior crossbite

Wong¹,

Sinclair²,

Keim³

et al. 2011

The Angle Orthodontist

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“…This type of malocclusion may be corrected in different manners, including slow expansion, [1][2][3] rapid expansion [4][5][6] and surgically assisted expansion. 7,8 Most rapid maxillary expansion treatments employ fixed tooth-tissue-borne and tooth-borne expanders.…”

Section: Introductionmentioning

confidence: 99%

Rapid palatal expansion: a comparison of two appliances

Rodrigues¹,

Monini

Gandini

et al. 2012

Braz. oral res.

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Rapid palatal expansion: a comparison of two appliancesAbstract: This study analyzed occlusal radiographs to compare the transverse changes produced in patients treated with rapid maxillary expansion using two types of appliances. The sample consisted of 31 children aged 7 to 10.6 years, of both genders, with posterior cross-bite. Fifteen children were treated with a tooth-borne expander and 16 were treated with a tooth-tissue-borne expander. Occlusal radiographs obtained at treatment onset and at the end of the retention period were digitized. The following variables were measured: intermolar distance (IMD), interapical distance (IApD), interbase distance (IBaD) and interarm distance (IArD). The results revealed increases in all measurements in both groups after rapid maxillary expansion. Comparison between groups revealed that the increases were greater in patients treated with the tooth-borne expander, except for the IArD measurement, which presented the same increase in both groups. Even though the IMD measurements differed between expanders, they were proportional to the activation of the appliances (IBaD). The increase in the IApD measurement was proportionally greater in the group treated with the tooth-borne expander (0.7:1.0) than in that treated with the tooth-tissue-borne expander (0.4:1.0). It was concluded that both appliances had similar effects, although the tooth-tissue-borne expander produced a lesser opening at the apical region of the incisors.

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“…Orthodontic approaches aiming at buccal inclination are often insufficient as a stand-alone treatment to achieve stable occlusal relationships, which determine permanent therapeutic success. Most authors agree that the orthodontic treatments exert their dentoalveolar effect, whereas surgical approaches result in the actual increase of the maxillary bone base [2,8,9,14,17,18,27,28].…”

Section: Discussionmentioning

confidence: 99%