CAJ | 학술논문

背景：以往的观点认为桩可以增强根管治疗牙的抗折裂强度，但近年来这种观念已引起争议，许多学者认为，根管的预备削弱了牙根，桩进一步增加了折裂的危险。目的：评价侧向加载条件下，采用不同纤维桩修复方法对重度楔状缺损前磨牙抗折性能的影响。方法：将50颗正畸拔除的人上颌前磨牙随机分为5组，每组10颗。A组为正常前磨牙；B-E组40颗牙均制备深达颊舌径1/3深度的重度楔状缺损，B组不做任何处理；C组经根管治疗，保留楔状缺损上方颊侧悬突牙体组织，颊、舌根管内采用LuxaPost高强度玻璃纤维桩、LuxaCore双固化冠核复合树脂修复缺损牙体组织；D组经根管治疗，保留楔状缺损上方颊侧悬突牙体组织，颊、舌根管内采用LuxaPost高强度玻璃纤维桩、LuxaCore双固化冠核复合树脂及金属全冠修复缺损牙体组织；E组经根管治疗，去除楔状缺损上方颊侧悬突牙体组织，颊、舌根管内采用 LuxaPost高强度玻璃纤维桩、LuxaCore双固化冠核复合树脂及金属全冠修复缺损牙体组织。检测各组样本折裂强度。结果与结论：A-E组抗折载荷分别为(1002.69±147.62)，(439.28±66.34)，(958.30±101.23)，(1207.09±143.48)，(1056.44±139.30) N。D组抗折载荷最高(P <0.01)，B组最低(P <0.01)，A、C、E三组间抗折载荷比较差异无显著性意义。表明纤维桩能增强重度楔状缺损牙的抗折能力，并且保留牙体组织有助于提高修复体的抗折性。
배경：이왕적관점인위장가이증강근관치료아적항절렬강도，단근년래저충관념이인기쟁의，허다학자인위，근관적예비삭약료아근，장진일보증가료절렬적위험。목적：평개측향가재조건하，채용불동섬유장수복방법대중도설상결손전마아항절성능적영향。방법：장50과정기발제적인상합전마아수궤분위5조，매조10과。A조위정상전마아；B-E조40과아균제비심체협설경1/3심도적중도설상결손，B조불주임하처리；C조경근관치료，보류설상결손상방협측현돌아체조직，협、설근관내채용LuxaPost고강도파리섬유장、LuxaCore쌍고화관핵복합수지수복결손아체조직；D조경근관치료，보류설상결손상방협측현돌아체조직，협、설근관내채용LuxaPost고강도파리섬유장、LuxaCore쌍고화관핵복합수지급금속전관수복결손아체조직；E조경근관치료，거제설상결손상방협측현돌아체조직，협、설근관내채용 LuxaPost고강도파리섬유장、LuxaCore쌍고화관핵복합수지급금속전관수복결손아체조직。검측각조양본절렬강도。결과여결론：A-E조항절재하분별위(1002.69±147.62)，(439.28±66.34)，(958.30±101.23)，(1207.09±143.48)，(1056.44±139.30) N。D조항절재하최고(P <0.01)，B조최저(P <0.01)，A、C、E삼조간항절재하비교차이무현저성의의。표명섬유장능증강중도설상결손아적항절능력，병차보류아체조직유조우제고수복체적항절성。
BACKGROUND:Previous studies show that the fracture resistant force of endodonticaly treated teeth can be improved by post. But this idea has been controversial in recent years. Many scholars believe that the root canal preparation might weaken dental root the post increases the risk of tooth fracture. OBJECTIVE: To evaluate the fracture resistance ability of severe wedge-shaped-defect premolar to oblique loading, which was restored with fiber reinforced composite posts by different therapy methods. METHODS:A total of 50 human maxilary premolars were randomly divided into five groups, with ten teeth in each group. They were given folowing treatments: Group A: 10 untreated premolars; Rest 40 premolars of Groups B, C, D and E were prepared 1/3 bucco-lingual distance for artificial severe wedge-shaped defects at the buccal cervix. Group B: untreated severe wedge-shaped defects premolars; Group C: severe wedge-shaped defects premolars were endodonticaly treated, remaining dentin over hang above the wedge shaped defect, LuxaPost posts reinforced in buccal canal and lingual canal, LuxaCore composite resin restored dentin defect; Group D: severe wedge-shaped defects premolars were endodonticaly treated, LuxaPost posts reinforced in buccal canal and lingual canal, LuxaCore composite resin restored dentin defect, and then covered with ful metal crown; Group E: severe wedge-shaped defects premolars were endodonticaly treated, removing dentin over hang above the wedge shaped defect, LuxaPost posts reinforced in buccal canal and lingual canal, restored with LuxaCore composite resin, and then covered with ful metal crown. Fracture resistance of each specimen was measured in each group. RESULTS AND CONCLUSION: The fracture strength of each group were Group A (1 002.69±147.62) N, Group B (439.28±66.34) N, Group C (958.30±101.23) N, Group D (1 207.09±143.48) N, and Group E (1 056.44±139.30) N. Group D had the highest fracture strength (P < 0.01), while Group B had the lowest fracture strength (P < 0.01). There were no significant difference among the fracture strength of Group A, Group C and Group E. Our findings indicated that the fracture resistance of the severe wedge-shaped defected premolar can be improved by fiber reinforced composite post and dentin above wedge shaped defect remained.