Photoelastic effects of maxillary protraction on the craniofacial complex

Itoh, Tetsuhiko; Chaconas, Spiro J.; Caputo, Angelo A.; Matyas, J.

doi:10.1016/0002-9416(85)90235-0

Cited by 64 publications

(34 citation statements)

References 12 publications

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“…15,16 It also has been revealed that, in photoelastic studies 17,18 and in animal studies, 19,20 the expansion force reached to and opened the circumaxillary sutures. The histologic pictures of the circumaxillary sutures showed stretched collagen fibers running across the sutures and immature bony tissue depositing along the borders of the sutures.…”

Section: Discussionmentioning

confidence: 99%

Opening of Circumaxillary Sutures by Alternate Rapid Maxillary Expansions and Constrictions

Wang

Chang

Liou

2009

The Angle Orthodontist

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Objective: To analyze quantitatively the circumaxillary suture opening after alternate rapid maxillary expansions and constrictions (Alt-RAMEC). Materials and Methods: Twelve inbred cats were randomly grouped into two equal groups for 1 week of rapid maxillary expansion (RME) (1 mm/day) or 5 weeks of Alt-RAMEC (1 mm/day). At the end of the experiment, the craniofacial skeleton of each cat was harvested. Each circumaxillary suture was then probed at three sites with a 0.5-mm pointed periodontal probe. A smooth probing without penetration was an ineffective suture opening (Ͻ0.5 mm), while a probing with penetration was an effective suture opening (Ͼ0.5 mm). For each suture, the quantity of suture opening (%) was the effective suture opening/(effective ϩ ineffective suture opening). The intergroup differences were analyzed by chi-square test (P Ͻ .05). Results: Five weeks of Alt-RAMEC opened the circumaxillary sutures significantly more than 1 week of RME. This affected the circumaxillary sutures running coronally and articulating directly to the maxilla (56.9% vs 36.1%, P Ͻ .001), the sutures running sagittally, but articulating indirectly to the maxilla (94.4% vs 64.8%, P Ͻ .001), and the sutures running coronally, but articulating indirectly to the maxilla (58.3% vs 33.3%, P Ͻ .01). The sutures running sagittally were opened significantly more (94.4%-100.0%) than those running coronally (56.9%-58.3%), no matter if they articulated directly or indirectly with the maxilla. Conclusions: Alt-RAMEC opens both the sagittally and coronally running circumaxillary sutures quantitatively more than conventional RME. However, more than 5 weeks of Alt-RAMEC would be needed to increase the opening of the coronally running circumaxillary sutures. (Angle Orthod. 2009:79; )

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Section: Discussionmentioning

confidence: 99%

Opening of Circumaxillary Sutures by Alternate Rapid Maxillary Expansions and Constrictions

Wang

Chang

Liou

2009

The Angle Orthodontist

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“…Numerous studies have reported decreases in the palatal plane angle after RPE and protraction, 7,9,17,24,34 and some studies have reported no significant changes. 19,35 Maxillary rotation has various causes, including the elastic protraction direction and intraoral point of force application.…”

Section: Main Findings In the Context Of The Existing Evidence Intermentioning

confidence: 98%

Effect of maxillary protraction with alternating rapid palatal expansion and constriction vs expansion alone in maxillary retrusive patients: A single-center, randomized controlled trial

Liu

Zhou

Wang

et al. 2015

American Journal of Orthodontics and Dentofacial Orthopedics

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“…2 Although the major effect of this treatment is noticed clinically in the dentition and maxilla area, RME therapy appears to involve an ample portion of the craniofacial complex, 3 as the maxilla is associated with 10 bones in the face and head. [4][5][6] This involvement has been hypothesized following investigations based on histologic methods, 7,8 radiologic imaging, photoelastic models, 7,9 bone scintigraphy, 10 and finite element analysis. [11][12][13][14][15][16][17][18] Histologic studies on animals demonstrated a sign of increased cellular activity at suture level and immature bony tissue depositing along the suture borders.…”

Section: Introductionmentioning

confidence: 99%

Early post-treatment changes of circumaxillary sutures in young patients treated with rapid maxillary expansion

Leonardi¹,

Sicurezza²,

Cutrera³

et al. 2011

The Angle Orthodontist

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Objective: To test the null hypothesis that circumaxillary sutures do not show bony displacement in response to rapid maxillary expansion (RME) therapy. Materials and Methods: Subjects consisted of eight growing patients (two male and six female) with Angle Class I malocclusion, bilateral posterior crossbite, transverse maxillary deficiency, deep palatal vault, and dental crowding at the start of the treatment. A Hyrax palatal expander was used for each patient, and activation protocol required the screw to be turned three times per day (0.25 mm per turn) for an average of 18 days for all subjects. Multislice computed tomography (CT) scans were performed before rapid palatal expansion (time T0) and again at the end of the active expansion phase (time T1) without removing the expander. Measurements were carried out directly on the CT image using the OsiriX Imaging software program. Data were analyzed statistically by using the Wilcoxon signed rank test. Results: All linear measurements showed an increase between T0 and T1 and RME determined a widening of suture; however, sutures far from the maxilla showed a smaller degree of disarticulation. Conclusions: The hypothesis is rejected. Early treatment with RME produced a significant bony displacement by circumaxillary suture opening. The amount of changes of sutures depends on different factors relating to the subjects and varies between different sutures, showing that sutures that articulate directly with the maxilla face a greater influence by the RME compared with those located further away. (Angle Orthod. 2011;81:36-41.)

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Photoelastic effects of maxillary protraction on the craniofacial complex

Cited by 64 publications

References 12 publications

Opening of Circumaxillary Sutures by Alternate Rapid Maxillary Expansions and Constrictions

Opening of Circumaxillary Sutures by Alternate Rapid Maxillary Expansions and Constrictions

Effect of maxillary protraction with alternating rapid palatal expansion and constriction vs expansion alone in maxillary retrusive patients: A single-center, randomized controlled trial

Early post-treatment changes of circumaxillary sutures in young patients treated with rapid maxillary expansion

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