CAJ | 학술논문

背景：针对临床颊侧多曲簧活动矫治器中HL-1及HL-2型颊侧多曲簧易断裂的问题，研制了HL-3型颊侧多曲簧。 　　目的：通过颊侧多曲簧仿真模拟试验仪模拟口腔开闭口运动，比较在相同条件下HL-2及HL-3型颊侧多曲簧的抗疲劳断裂强度。 　　方法：将HL-2及HL-3型颊侧多曲簧固定在颊侧多曲簧仿真模拟试验仪上，位置模拟口腔内相应位置，两侧大小、高度、方向完全对称，开动仪器开始模拟口腔开闭口运动直至任意一侧颊侧多曲簧出现断裂并计录此时开闭口循环次数；通过扫描电镜观察断裂颊侧多曲簧的断口形貌特征。 　　结果与结论：HL-3型颊侧多曲簧的开闭口循环次数明显多于HL-2型颊侧多曲簧(P<0.01)，说明HL-3型颊侧多曲簧与HL-2型颊侧多曲簧相比具有更强的抗疲劳断裂强度；扫描电镜观察结果示，HL-2型颊侧多曲簧和HL-3型颊侧多曲簧断口均有明显的疲劳断裂特征，证明HL-2型颊侧多曲簧与HL-3型颊侧多曲簧的断裂均属于疲劳断裂；但在HL-3型颊侧多曲簧疲劳断口上可观察到较HL-2型大的裂纹区，并在断裂纹中可见磨合区，表明HL-3型颊侧多曲簧相对减少了多曲簧出现疲劳断裂的概率，延长了疲劳断裂时间。
배경：침대림상협측다곡황활동교치기중HL-1급HL-2형협측다곡황역단렬적문제，연제료HL-3형협측다곡황。 　　목적：통과협측다곡황방진모의시험의모의구강개폐구운동，비교재상동조건하HL-2급HL-3형협측다곡황적항피로단렬강도。 　　방법：장HL-2급HL-3형협측다곡황고정재협측다곡황방진모의시험의상，위치모의구강내상응위치，량측대소、고도、방향완전대칭，개동의기개시모의구강개폐구운동직지임의일측협측다곡황출현단렬병계록차시개폐구순배차수；통과소묘전경관찰단렬협측다곡황적단구형모특정。 　　결과여결론：HL-3형협측다곡황적개폐구순배차수명현다우HL-2형협측다곡황(P<0.01)，설명HL-3형협측다곡황여HL-2형협측다곡황상비구유경강적항피로단렬강도；소묘전경관찰결과시，HL-2형협측다곡황화HL-3형협측다곡황단구균유명현적피로단렬특정，증명HL-2형협측다곡황여HL-3형협측다곡황적단렬균속우피로단렬；단재HL-3형협측다곡황피로단구상가관찰도교HL-2형대적렬문구，병재단렬문중가견마합구，표명HL-3형협측다곡황상대감소료다곡황출현피로단렬적개솔，연장료피로단렬시간。
BACKGROUND:Concerning the problem of the ruptured phenomenon in clinic work of HL-1 and HL-2 Buccal Multiloops removable appliance, we invented HL-3 Buccal Multiloops. OBJECTIVE:Through the Buccal Multiloops Fatigue Testing Machine which can imitate oral movements, to compare the fatigue strength of the HL-2 and HL-3 Buccal Multiloops in the same condition. METHODS:A pair of the HL-2 or HL-3 Buccal Multiloops with the completely symmetrical size, symmetrical height and symmetrical direction was fixed on the Buccal Multiloops Fatigue Testing Machine which could simulate oral movements, then keep the Buccal Multiloops Fatigue Testing Machine working until any Buccal Multiloops broke. The cyclic loading times of this pair Buccal Multiloops was recorded. Scanning electron microscope was used to observe the appearance of broken end of the Buccal Multiloops. RESULTS AND CONCLUSION:The cyclic loading times of HL-3 Buccal Multiloops were more than HL-2 Buccal Multiloops (P < 0.01), suggesting that HL-3 Buccal Multiloops has stronger fatigue strength than HL-2 Buccal Multiloops. Scanning electron microscope observation showed that the fractures of HL-2 and HL-3 Buccal Multiloops al had the typical fatigue fracture morphology, indicating that the rupture of HL-2 and HL-3 Buccal Multiloops belongs to fatigue fracture. However, HL-3 Buccal Multiloops exhibited bigger crack compared with HL-2 Buccal Multiloops, the presence of running-in region, suggesting that HL-3 Buccal Multiloops reduced the probability of fatigue fracture and prolonged the time of fatigue fracture.