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Won Moon - One of the best experts on this subject based on the ideXlab platform.

  • effects of monocortical and bicortical mini implant anchorage on bone borne Palatal Expansion using finite element analysis
    American Journal of Orthodontics and Dentofacial Orthopedics, 2017
    Co-Authors: Robert J Lee, Won Moon, Christine Hong
    Abstract:

    Introduction Bone-borne Palatal Expansion relies on mini-implant stability for successful orthopedic Expansion. The large magnitude of applied force experienced by mini-implants during bone-borne Expansion may lead to high failure rates. Use of bicortical mini-implant anchorage rather than monocortical anchorage may improve mini-implant stability. The aims of this study were to analyze and compare the effects of bicortical and monocortical anchorages on stress distribution and displacement during bone-borne Palatal Expansion using finite element analysis. Methods Two skull models were constructed to represent Expansion before and after midPalatal suture opening. Three clinical situations with varying mini-implant insertion depths were studied in each skull model: monocortical, 1-mm bicortical, and 2.5-mm bicortical. Finite element analysis simulations were performed for each clinical situation in both skull models. Von Mises stress distribution and transverse displacement were evaluated for all models. Results Peri-implant stress was greater in the monocortical anchorage model compared with both bicortical anchorage models. In addition, transverse displacement was greater and more parallel in the coronal plane for both bicortical models compared with the monocortical model. Minimal differences were observed between the 1-mm and the 2.5-mm bicortical models for both peri-implant stress and transverse displacement. Conclusions Bicortical mini-implant anchorage results in improved mini-implant stability, decreased mini-implant deformation and fracture, more parallel Expansion in the coronal plane, and increased Expansion during bone-borne Palatal Expansion. However, the depth of bicortical mini-implant anchorage was not significant.

  • Non-surgical treatment of transverse deficiency in adults using Microimplant-assisted Rapid Palatal Expansion (MARPE).
    Dental press journal of orthodontics, 2017
    Co-Authors: Daniel Paludo Brunetto, Andre Wilson Machado, Eduardo Franzzotti Sant’anna, Won Moon
    Abstract:

    Introduction Maxillary transverse deficiency is a highly prevalent malocclusion present in all age groups, from primary to permanent dentition. If not treated on time, it can aggravate and evolve to a more complex malocclusion, hindering facial growth and development. Aside from the occlusal consequences, the deficiency can bring about serious respiratory problems as well, due to the consequent nasal constriction usually associated. In growing patients, this condition can be easily handled with a conventional rapid Palatal Expansion. However, mature patients are frequently subjected to a more invasive procedure, the surgically-assisted rapid Palatal Expansion (SARPE). More recently, researches have demonstrated that it is possible to expand the maxilla in grown patients without performing osteotomies, but using microimplants anchorage instead. This novel technique is called microimplant-assisted rapid Palatal Expansion (MARPE). Objective The aim of the present article was to demonstrate and discuss a MARPE technique developed by Dr. Won Moon and colleagues at University of California - Los Angeles (UCLA). Methods All laboratory and clinical steps needed for its correct execution are thoroughly described. For better comprehension, a mature patient case is reported, detailing all the treatment progress and results obtained. Conclusion It was concluded that the demonstrated technique could be an interesting alternative to SARPE in the majority of non-growing patients with maxillary transverse deficiency. The present patient showed important occlusal and respiratory benefits following the procedure, without requiring any surgical intervention.

  • Microimplant-assisted rapid Palatal Expansion appliance to orthopedically correct transverse maxillary deficiency in an adult
    American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists its constituent socie, 2016
    Co-Authors: Chuck Carlson, Andre Wilson Machado, Jay Sung, Ryan W. Mccomb, Won Moon
    Abstract:

    This case report describes the use of a microimplant-assisted rapid Palatal Expansion (MARPE) appliance to orthopedically correct a transverse maxillary deficiency in an adult patient. Expansion forces transmitted through the teeth in traditional rapid Palatal Expansion appliances create unwanted dental effects rather than true skeletal Expansion, particularly in older patients with more rigid interdigitation of the midPalatal suture. This 19-year-old patient had maxillary constriction with a unilateral posterior crossbite. A MARPE appliance secured to the Palatal bones with 4 microimplants was expanded by 10 mm. Pre-MARPE and post-MARPE cone-beam computed tomography cross sections demonstrated 4 to 6 mm of Expansion of the maxillofacial structures, including the zygoma and nasal bone area, and widening of the circummaxillary sutures. Minor buccal tipping of the dentition was observed, but the integrity of the alveolar bone was preserved. This report demonstrates that careful design and application of the MARPE appliance can achieve successful transverse Expansion of the maxilla and the surrounding structures in a patient beyond the age typically considered acceptable for traditional rapid Palatal Expansion.

  • The effects of micro-implant assisted rapid Palatal Expansion (MARPE) on the nasomaxillary complex—a finite element method (FEM) analysis
    Progress in Orthodontics, 2014
    Co-Authors: Matt Macginnis, George Youssef, Howard Chu, Andre Wilson Machado, Won Moon
    Abstract:

    Background Orthodontic Palatal Expansion appliances have been widely used with satisfactory and, most often, predictable clinical results. Recently, clinicians have successfully utilized micro-implants with Palatal expander designs to work as anchors to the palate to achieve more efficient skeletal Expansion and to decrease undesired dental effects. The purpose of the study was to use finite element method (FEM) to determine the stress distribution and displacement within the craniofacial complex when simulated conventional and micro-implant-assisted rapid Palatal Expansion (MARPE) Expansion forces are applied to the maxilla. The simulated stress distribution produced within the palate and maxillary buttresses in addition to the displacement and rotation of the maxilla could then be analyzed to determine if micro-implants aid in skeletal Expansion. Methods A three-dimensional (3D) mesh model of the cranium with associated maxillary sutures was developed using computed tomography (CT) images and Mimics modeling software. To compare transverse Expansion stresses in rapid Palatal Expansion (RPE) and MARPE, Expansion forces were distributed to differing points on the maxilla and evaluated with ANSYS simulation software. Results The stresses distributed from forces applied to the maxillary teeth are distributed mainly along the trajectories of the three maxillary buttresses. In comparison, the MARPE showed tension and compression directed to the palate, while showing less rotation, and tipping of the maxillary complex. In addition, the conventional hyrax displayed a rotation of the maxilla around the teeth as opposed to the midPalatal suture of the MARPE. This data suggests that the MARPE causes the maxilla to bend laterally, while preventing unwanted rotation of the complex. Conclusions In conclusion, the MARPE may be beneficial for hyperdivergent patients, or those that have already experienced closure of the midPalatal suture, who require Palatal Expansion and would worsen from buccal tipping of the teeth or maxillary complex.

  • The effects of micro-implant assisted rapid Palatal Expansion (MARPE) on the nasomaxillary complex--a finite element method (FEM) analysis.
    Progress in orthodontics, 2014
    Co-Authors: Matt Macginnis, George Youssef, Howard Chu, Andre Wilson Machado, Won Moon
    Abstract:

    Orthodontic Palatal Expansion appliances have been widely used with satisfactory and, most often, predictable clinical results. Recently, clinicians have successfully utilized micro-implants with Palatal expander designs to work as anchors to the palate to achieve more efficient skeletal Expansion and to decrease undesired dental effects. The purpose of the study was to use finite element method (FEM) to determine the stress distribution and displacement within the craniofacial complex when simulated conventional and micro-implant-assisted rapid Palatal Expansion (MARPE) Expansion forces are applied to the maxilla. The simulated stress distribution produced within the palate and maxillary buttresses in addition to the displacement and rotation of the maxilla could then be analyzed to determine if micro-implants aid in skeletal Expansion. A three-dimensional (3D) mesh model of the cranium with associated maxillary sutures was developed using computed tomography (CT) images and Mimics modeling software. To compare transverse Expansion stresses in rapid Palatal Expansion (RPE) and MARPE, Expansion forces were distributed to differing points on the maxilla and evaluated with ANSYS simulation software. The stresses distributed from forces applied to the maxillary teeth are distributed mainly along the trajectories of the three maxillary buttresses. In comparison, the MARPE showed tension and compression directed to the palate, while showing less rotation, and tipping of the maxillary complex. In addition, the conventional hyrax displayed a rotation of the maxilla around the teeth as opposed to the midPalatal suture of the MARPE. This data suggests that the MARPE causes the maxilla to bend laterally, while preventing unwanted rotation of the complex. In conclusion, the MARPE may be beneficial for hyperdivergent patients, or those that have already experienced closure of the midPalatal suture, who require Palatal Expansion and would worsen from buccal tipping of the teeth or maxillary complex.

Geng Hai-xia - One of the best experts on this subject based on the ideXlab platform.

  • A study of maxillary protraction and rapid Palatal Expansion on the treatment of growing patients with skeletal class III malocclusion
    Journal of Jining Medical University, 2009
    Co-Authors: Geng Hai-xia
    Abstract:

    Objective To evaluate the effect of maxillary protraction and rapid Palatal Expansion on growing patients with skeletal class Ⅲ malocclusion.Methods 30 growing patients with skeletal class Ⅲ malocclusion were divided into 2 groups.15 patients were treated with maxillary protraction and rapid Palatal Expansion as treatment group.The others were treated with maxillary protraction without rapid Palatal Expansion as control group.Cephalometric analysis was compared using lateral cephalograms taken before and after treatment.there no significant different between maxillary protraction and rapid Palatal Expansion treatment group.Results Maxillary protraction and rapid Palatal Expansion effectly promote the development of maxilla,while was no significant effect on mandible.Conclusion Maxillary protraction and rapid Palatal Expansion on the treatment of growing patients with skeletal class Ⅲ malocclusion was improvement of the maxillary transverse deficiency.

Andre Wilson Machado - One of the best experts on this subject based on the ideXlab platform.

  • Non-surgical treatment of transverse deficiency in adults using Microimplant-assisted Rapid Palatal Expansion (MARPE).
    Dental press journal of orthodontics, 2017
    Co-Authors: Daniel Paludo Brunetto, Andre Wilson Machado, Eduardo Franzzotti Sant’anna, Won Moon
    Abstract:

    Introduction Maxillary transverse deficiency is a highly prevalent malocclusion present in all age groups, from primary to permanent dentition. If not treated on time, it can aggravate and evolve to a more complex malocclusion, hindering facial growth and development. Aside from the occlusal consequences, the deficiency can bring about serious respiratory problems as well, due to the consequent nasal constriction usually associated. In growing patients, this condition can be easily handled with a conventional rapid Palatal Expansion. However, mature patients are frequently subjected to a more invasive procedure, the surgically-assisted rapid Palatal Expansion (SARPE). More recently, researches have demonstrated that it is possible to expand the maxilla in grown patients without performing osteotomies, but using microimplants anchorage instead. This novel technique is called microimplant-assisted rapid Palatal Expansion (MARPE). Objective The aim of the present article was to demonstrate and discuss a MARPE technique developed by Dr. Won Moon and colleagues at University of California - Los Angeles (UCLA). Methods All laboratory and clinical steps needed for its correct execution are thoroughly described. For better comprehension, a mature patient case is reported, detailing all the treatment progress and results obtained. Conclusion It was concluded that the demonstrated technique could be an interesting alternative to SARPE in the majority of non-growing patients with maxillary transverse deficiency. The present patient showed important occlusal and respiratory benefits following the procedure, without requiring any surgical intervention.

  • Microimplant-assisted rapid Palatal Expansion appliance to orthopedically correct transverse maxillary deficiency in an adult
    American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists its constituent socie, 2016
    Co-Authors: Chuck Carlson, Andre Wilson Machado, Jay Sung, Ryan W. Mccomb, Won Moon
    Abstract:

    This case report describes the use of a microimplant-assisted rapid Palatal Expansion (MARPE) appliance to orthopedically correct a transverse maxillary deficiency in an adult patient. Expansion forces transmitted through the teeth in traditional rapid Palatal Expansion appliances create unwanted dental effects rather than true skeletal Expansion, particularly in older patients with more rigid interdigitation of the midPalatal suture. This 19-year-old patient had maxillary constriction with a unilateral posterior crossbite. A MARPE appliance secured to the Palatal bones with 4 microimplants was expanded by 10 mm. Pre-MARPE and post-MARPE cone-beam computed tomography cross sections demonstrated 4 to 6 mm of Expansion of the maxillofacial structures, including the zygoma and nasal bone area, and widening of the circummaxillary sutures. Minor buccal tipping of the dentition was observed, but the integrity of the alveolar bone was preserved. This report demonstrates that careful design and application of the MARPE appliance can achieve successful transverse Expansion of the maxilla and the surrounding structures in a patient beyond the age typically considered acceptable for traditional rapid Palatal Expansion.

  • The effects of micro-implant assisted rapid Palatal Expansion (MARPE) on the nasomaxillary complex—a finite element method (FEM) analysis
    Progress in Orthodontics, 2014
    Co-Authors: Matt Macginnis, George Youssef, Howard Chu, Andre Wilson Machado, Won Moon
    Abstract:

    Background Orthodontic Palatal Expansion appliances have been widely used with satisfactory and, most often, predictable clinical results. Recently, clinicians have successfully utilized micro-implants with Palatal expander designs to work as anchors to the palate to achieve more efficient skeletal Expansion and to decrease undesired dental effects. The purpose of the study was to use finite element method (FEM) to determine the stress distribution and displacement within the craniofacial complex when simulated conventional and micro-implant-assisted rapid Palatal Expansion (MARPE) Expansion forces are applied to the maxilla. The simulated stress distribution produced within the palate and maxillary buttresses in addition to the displacement and rotation of the maxilla could then be analyzed to determine if micro-implants aid in skeletal Expansion. Methods A three-dimensional (3D) mesh model of the cranium with associated maxillary sutures was developed using computed tomography (CT) images and Mimics modeling software. To compare transverse Expansion stresses in rapid Palatal Expansion (RPE) and MARPE, Expansion forces were distributed to differing points on the maxilla and evaluated with ANSYS simulation software. Results The stresses distributed from forces applied to the maxillary teeth are distributed mainly along the trajectories of the three maxillary buttresses. In comparison, the MARPE showed tension and compression directed to the palate, while showing less rotation, and tipping of the maxillary complex. In addition, the conventional hyrax displayed a rotation of the maxilla around the teeth as opposed to the midPalatal suture of the MARPE. This data suggests that the MARPE causes the maxilla to bend laterally, while preventing unwanted rotation of the complex. Conclusions In conclusion, the MARPE may be beneficial for hyperdivergent patients, or those that have already experienced closure of the midPalatal suture, who require Palatal Expansion and would worsen from buccal tipping of the teeth or maxillary complex.

  • The effects of micro-implant assisted rapid Palatal Expansion (MARPE) on the nasomaxillary complex--a finite element method (FEM) analysis.
    Progress in orthodontics, 2014
    Co-Authors: Matt Macginnis, George Youssef, Howard Chu, Andre Wilson Machado, Won Moon
    Abstract:

    Orthodontic Palatal Expansion appliances have been widely used with satisfactory and, most often, predictable clinical results. Recently, clinicians have successfully utilized micro-implants with Palatal expander designs to work as anchors to the palate to achieve more efficient skeletal Expansion and to decrease undesired dental effects. The purpose of the study was to use finite element method (FEM) to determine the stress distribution and displacement within the craniofacial complex when simulated conventional and micro-implant-assisted rapid Palatal Expansion (MARPE) Expansion forces are applied to the maxilla. The simulated stress distribution produced within the palate and maxillary buttresses in addition to the displacement and rotation of the maxilla could then be analyzed to determine if micro-implants aid in skeletal Expansion. A three-dimensional (3D) mesh model of the cranium with associated maxillary sutures was developed using computed tomography (CT) images and Mimics modeling software. To compare transverse Expansion stresses in rapid Palatal Expansion (RPE) and MARPE, Expansion forces were distributed to differing points on the maxilla and evaluated with ANSYS simulation software. The stresses distributed from forces applied to the maxillary teeth are distributed mainly along the trajectories of the three maxillary buttresses. In comparison, the MARPE showed tension and compression directed to the palate, while showing less rotation, and tipping of the maxillary complex. In addition, the conventional hyrax displayed a rotation of the maxilla around the teeth as opposed to the midPalatal suture of the MARPE. This data suggests that the MARPE causes the maxilla to bend laterally, while preventing unwanted rotation of the complex. In conclusion, the MARPE may be beneficial for hyperdivergent patients, or those that have already experienced closure of the midPalatal suture, who require Palatal Expansion and would worsen from buccal tipping of the teeth or maxillary complex.

Wang Fen - One of the best experts on this subject based on the ideXlab platform.

  • Effects of icariin on rapid Palatal Expansion induced root resorption:An scanning electron microscopic investigation
    Chinese Journal of Conservative Dentistry, 2013
    Co-Authors: Wang Fen
    Abstract:

    AIM:To investigate the effect of icariin on Palatal Expansion induced root resorption in rats.METHODS:48 male Wistar rats were divided randomly into 3 groups(n=16) as A(negative control,untreated),B(positive control,treated with rapid Palatal Expansion) and C(experimental,treated with rapid Palatal Expansion and intragastric administration of icariin at 2.5 mg/kg·day).In group B and C an initial force of 50 g was applied to the area between the right and left upper first molars of the rats for 21days for Palatal Expansion.The root resorption index(RRI) was determined with scanning electron microscopy(SEM).RESULTS:In group A,B and C RRI was 0.50 ±0.06、25.12±2.54 and 3.40±0.48 respectively(between each 2 groups,P0.05).SEM observation revealed reparative cementum in the icariin-treated rat samples.CONCLUSION:Icariin has a reparative effect on rapid Palatal Expansion induced root resorption in rats.

Deng Xi-h - One of the best experts on this subject based on the ideXlab platform.

  • Palatal changes after maxillary protraction with rapid Palatal Expansion in early skeletal class III malocclusion with posterior crossbite
    Journal of Clinical Stomatology, 2009
    Co-Authors: Deng Xi-h
    Abstract:

    Objective:To evaluate the Palatal changes after maxillary protraction with rapid Palatal Expansion in early skeletal class Ⅲ malocclusion with posterior crossbite. Methord:12 cases of the primary and early mixed dentition skeletal class Ⅲ malocclusion with posterior crossbite. Hyrax rapid Palatal Expansion were used for 2～3 weeks in the first period ,Palatal cusps of upper molars in contact with vestibular cusps of lower molar,rapid Palatal Expansion was terminated at this point.In second period ,patients got anterior teeth overbite 2～4 mm with maxillary protraction. Casts were taken befor and afer treatment.The differences were compared with t tests. Result:Palatal width change was1.98 mm±0.97 mm,intermolar width change was 5.04 mm±1.30 mm,Ratio Palatal width change/intermolar width change was 41%,maxillary alveolar tipping change was 8.57°±4.05°,left maxillary molar tipping change was 8.99°±4.06°,right maxillary molar tipping change was 8.34° ±3.94° ,differences were statistically significant.Palatal depth changes was not statistically significant. Conclusion:Maxillary protraction with rapid Palatal Expansion was a good way to treat early sketetal class Ⅲ maocclusion with posterior crossbite.Significant increases were found in Palatal width,intermolar width,alveolar tipping,molar tipping.No significant changes were found in Palatal depth.

  • Upper arch changes after maxillary protraction with rapid Palatal Expansion in skeletal Class III patients by anchoring to the primary teeth
    Beijing Journal of Stomatology, 2009
    Co-Authors: Deng Xi-h
    Abstract:

    Objective To evaluate the changes of dentoskeletal profile and maxillary arch after maxillary protraction with rapid Palatal Expansion in the early mixed dentitions of skeletal classⅢ patients.Methods Serious skeletal Class Ⅲ patients were selected in the early mixed dentitions,6 males and 4 females.Cephalograms and casts were taken before treatment(T1) and after teatment(T2).Dentoskeletal and maxillary arch changes were compared statistically.Results After treatment,lateral profile changed significantly.SNA,ANB and Wits increased by 2.70±0.97°,3.99±1.95°and 3.21±1.00 mm respectively compared with pretreatment(P0.001).The increased maxillary arch width gradually reduced from anterior to the posterior and the arch perimeter increased by 4.66+0.93mm(P0.001).Conclusion Maxillary protraction with rapid Palatal Expansion by anchoring to the primary teeth for skeletal Class Ⅲ patients could change the lateral dentoskeletal profile markedly.