CAJ | 학술논문

背景：纤维桩具有与天然牙本质接近的弹性模量，在受外力时能够与根管壁保持广泛面接触，与牙本质形成一同质的整体，使应力沿根管壁均匀传导，减少根折的发生。 　　目的：观察牙槽骨高度和纤维桩长度对上颌中切牙抗折性能的影响。 　　方法：将48颗离体上颌中切牙随机分为6组，每组8颗。A，B，C组牙槽骨距离釉质牙骨质界的距离为2 mm，纤维桩长度分别为5，7，9 mm；D，E，F组牙槽骨距离釉质牙骨质界的距离为5 mm，纤维桩长度分别为5，7，9 mm。截冠、根管治疗、纤维桩树脂核及铸造金属全冠修复后，将试样牙置于电子万能试验机上，与牙体长轴呈45?的加载方向，以1 mm/min的加载速度，持续加载至试样牙发生折裂。记录折裂时的加载强度和折裂模式。 　　结果与结论：牙槽骨高度对试样牙的抗折性能有显著影响(F=560.943，P<0.05)；纤维桩长度对试样牙的抗折性能没有显著影响(P>0.05)。牙槽骨高度正常各组试样牙断裂模式多为可修复性断裂模式，牙槽骨高度降低各组试样牙断裂模式多为不可修复性断裂模式，差异有显著性意义(χ2=5.689，P <0.05)。说明在牙槽骨高度降低的情况下，增加纤维桩的长度不能提高牙齿的抗折性能。
배경：섬유장구유여천연아본질접근적탄성모량，재수외력시능구여근관벽보지엄범면접촉，여아본질형성일동질적정체，사응력연근관벽균균전도，감소근절적발생。 　　목적：관찰아조골고도화섬유장장도대상합중절아항절성능적영향。 　　방법：장48과리체상합중절아수궤분위6조，매조8과。A，B，C조아조골거리유질아골질계적거리위2 mm，섬유장장도분별위5，7，9 mm；D，E，F조아조골거리유질아골질계적거리위5 mm，섬유장장도분별위5，7，9 mm。절관、근관치료、섬유장수지핵급주조금속전관수복후，장시양아치우전자만능시험궤상，여아체장축정45?적가재방향，이1 mm/min적가재속도，지속가재지시양아발생절렬。기록절렬시적가재강도화절렬모식。 　　결과여결론：아조골고도대시양아적항절성능유현저영향(F=560.943，P<0.05)；섬유장장도대시양아적항절성능몰유현저영향(P>0.05)。아조골고도정상각조시양아단렬모식다위가수복성단렬모식，아조골고도강저각조시양아단렬모식다위불가수복성단렬모식，차이유현저성의의(χ2=5.689，P <0.05)。설명재아조골고도강저적정황하，증가섬유장적장도불능제고아치적항절성능。
BACKGROUND:The elastic modulus of the fiber post is close to that of the dentine, so it can form a homogeneous whole and share the masticatory force, which can ease the stress concentration of dentine and prevent from tooth fracture. OBJECTIVE:To investigate the effect of alveolar bone height and fiber post length on the fracture resistance of endodontical y treated maxil ary central incisors. METHODS:Forty-eight human maxil ary central incisors were assigned randomly to six groups (n=8) of three different post insertion depths (5, 7, 9 mm) and two alveolar bone levels (2 and 5 mm) from the cement-enamel junction. Al of them were restored by glass fiber posts with composite resin core and cast metal crown. The samples were loaded in a testing machine with a crosshead speed of 1 mm/min at a 45° angle to the long axis of the tooth on the palatal surfaces until tooth fracture occurred. The maximum load and failure mode were recorded. RESULTS AND CONCLUSION:Alveolar bone height had a significant influence on the fracture resistance (F=560.943, P>0.05), but fiber post length did not have a significant influence on it (P>0.05). Significant differences were found between the normal and resorbed alveolar bone groups in the number of repairable fracture patterns (χ2=5.689, P<0.05). Under the circumstance of lowered alveolar bone height, lengthening fiber post cannot enhance fracture resistance of the teeth.