Ye Liu, Xiao-Lei Ge, Shi-Long Zhang, Yuan Qin, Yan Hou, Hai-Yan Lu, Wen-Sheng Ma
{"title":"[改良上颌前突矫治器治疗骨骼Ⅲ级错牙合伴拥挤患者的评估]。","authors":"Ye Liu, Xiao-Lei Ge, Shi-Long Zhang, Yuan Qin, Yan Hou, Hai-Yan Lu, Wen-Sheng Ma","doi":"","DOIUrl":null,"url":null,"abstract":"<p><strong>Purpose: </strong>To investigate the efficacy of a modified maxillary protraction appliance in patients of skeletal Class Ⅲ with crowding.</p><p><strong>Methods: </strong>Forty patients with skeletal Class Ⅲ malocclusion were divided into two groups, with 20 patients in each group. The experimental group had molar in a neutral or distal relationship and applied a modified maxillary protraction appliance, while the control group had molar mesial relationship and applied a conventional maxillary protraction appliance. Lateral cephalometric radiographs were taken before and after treatment in both groups for comparison. SPSS 22.0 software package was used for data analysis.</p><p><strong>Results: </strong>The angle measurements taken before and after treatment showed a significant increase in SNA, ANB, SN-MP and U4-SN(P<0.01), while SNB decreased(P<0.01) in both groups. SN-OL changes were statistically different before and after treatment in the experimental group(P<0.05). The sagittal measurements before and after treatment in both groups showed significant alterations in all(P<0.05) but the length of the maxillary arch in both groups. For vertical measurements, U1-PP, L1-MP, U4-SN, U6-SN, and ANS-ME all increased (P<0.05), while the changes of U4-PP and U6-PP in the two groups before and after treatment were statistically different(P<0.05). Compared with the control group, the experimental group had a significantly increased maxillary arch length, a more remote location at U6, and a less variable molar relationship after treatment(P<0.01). The two groups showed a variable amount of cephalometric measurements before and after treatment: the experimental group had a significant increase in maxillary arch length, a more remote position at U6, and a smaller change in molar relationship compared to the control group(P<0.01).</p><p><strong>Conclusions: </strong>The modified maxillary protraction appliance showed good results for maxillary protraction and pushing the molar distally in patients with skeletal Class Ⅲ with crowding at neutral or distal molar relationship.</p>","PeriodicalId":21709,"journal":{"name":"上海口腔医学","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"[Evaluation of a modified maxillary protraction appliance for the treatment of patients with skeletal Class Ⅲ malocclusion associated with crowding].\",\"authors\":\"Ye Liu, Xiao-Lei Ge, Shi-Long Zhang, Yuan Qin, Yan Hou, Hai-Yan Lu, Wen-Sheng Ma\",\"doi\":\"\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Purpose: </strong>To investigate the efficacy of a modified maxillary protraction appliance in patients of skeletal Class Ⅲ with crowding.</p><p><strong>Methods: </strong>Forty patients with skeletal Class Ⅲ malocclusion were divided into two groups, with 20 patients in each group. The experimental group had molar in a neutral or distal relationship and applied a modified maxillary protraction appliance, while the control group had molar mesial relationship and applied a conventional maxillary protraction appliance. Lateral cephalometric radiographs were taken before and after treatment in both groups for comparison. SPSS 22.0 software package was used for data analysis.</p><p><strong>Results: </strong>The angle measurements taken before and after treatment showed a significant increase in SNA, ANB, SN-MP and U4-SN(P<0.01), while SNB decreased(P<0.01) in both groups. SN-OL changes were statistically different before and after treatment in the experimental group(P<0.05). The sagittal measurements before and after treatment in both groups showed significant alterations in all(P<0.05) but the length of the maxillary arch in both groups. For vertical measurements, U1-PP, L1-MP, U4-SN, U6-SN, and ANS-ME all increased (P<0.05), while the changes of U4-PP and U6-PP in the two groups before and after treatment were statistically different(P<0.05). Compared with the control group, the experimental group had a significantly increased maxillary arch length, a more remote location at U6, and a less variable molar relationship after treatment(P<0.01). The two groups showed a variable amount of cephalometric measurements before and after treatment: the experimental group had a significant increase in maxillary arch length, a more remote position at U6, and a smaller change in molar relationship compared to the control group(P<0.01).</p><p><strong>Conclusions: </strong>The modified maxillary protraction appliance showed good results for maxillary protraction and pushing the molar distally in patients with skeletal Class Ⅲ with crowding at neutral or distal molar relationship.</p>\",\"PeriodicalId\":21709,\"journal\":{\"name\":\"上海口腔医学\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-04-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"上海口腔医学\",\"FirstCategoryId\":\"3\",\"ListUrlMain\":\"\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"Medicine\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"上海口腔医学","FirstCategoryId":"3","ListUrlMain":"","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"Medicine","Score":null,"Total":0}
[Evaluation of a modified maxillary protraction appliance for the treatment of patients with skeletal Class Ⅲ malocclusion associated with crowding].
Purpose: To investigate the efficacy of a modified maxillary protraction appliance in patients of skeletal Class Ⅲ with crowding.
Methods: Forty patients with skeletal Class Ⅲ malocclusion were divided into two groups, with 20 patients in each group. The experimental group had molar in a neutral or distal relationship and applied a modified maxillary protraction appliance, while the control group had molar mesial relationship and applied a conventional maxillary protraction appliance. Lateral cephalometric radiographs were taken before and after treatment in both groups for comparison. SPSS 22.0 software package was used for data analysis.
Results: The angle measurements taken before and after treatment showed a significant increase in SNA, ANB, SN-MP and U4-SN(P<0.01), while SNB decreased(P<0.01) in both groups. SN-OL changes were statistically different before and after treatment in the experimental group(P<0.05). The sagittal measurements before and after treatment in both groups showed significant alterations in all(P<0.05) but the length of the maxillary arch in both groups. For vertical measurements, U1-PP, L1-MP, U4-SN, U6-SN, and ANS-ME all increased (P<0.05), while the changes of U4-PP and U6-PP in the two groups before and after treatment were statistically different(P<0.05). Compared with the control group, the experimental group had a significantly increased maxillary arch length, a more remote location at U6, and a less variable molar relationship after treatment(P<0.01). The two groups showed a variable amount of cephalometric measurements before and after treatment: the experimental group had a significant increase in maxillary arch length, a more remote position at U6, and a smaller change in molar relationship compared to the control group(P<0.01).
Conclusions: The modified maxillary protraction appliance showed good results for maxillary protraction and pushing the molar distally in patients with skeletal Class Ⅲ with crowding at neutral or distal molar relationship.