Clinical Evaluation of Full Coverage Crowns Ten Years after Placement
Clinical Evaluation of Full Coverage Crowns Ten Years after Placement
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放置十年后全覆盖牙冠的临床评估
DOI：
10.2186/prp.1.82
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
S. Itoh
中科院分区：
文献类型：
--
作者：
Tsukasa Shioyama;S. Nagai;M. Fujisawa;K. Ishibashi;K. Furukawa;S. Itoh
目的：本研究的目的是澄清冠失败的频率和原因，根据寿命和质量的全覆盖冠评价在226 patients.Materials和方法：共529例患者谁收到全覆盖冠1980年至1987年在学生诊所，226（42.7%）响应要求参加召回考试。根据岩手医科大学牙科学系固定修复学系学生临床手册，以统一的方式制作和交付牙冠。结果：226名参与者（61名男性和165名女性，平均年龄41.6岁）在1996年和1997年之间参加了回忆检查。牙周袋深度为2.2±0.1 mm（平均值±标准差）。初始检查时为2.2±0.8 mm（平均值±标准差）在召回考试中。初次就诊时的牙龈指数表明，90.3%的召回受试者有轻微的牙龈炎症或根本没有。对388个牙冠进行了10-16年的随访检查，发现38个牙冠（9.8%）因牙周病、龋齿和/或骨折而丢失或更换。在失败的冠中，19个基牙被拔除，11个冠被移除并重新制作为固定桥基牙，8个冠被替换为新冠。在5年，10年和16年后的冠的生存率分别为96.9%，93.3%，84.9%，respectively.Conclusion：虽然召回率的后续研究是低的，这表明，牙周状况在治疗的初始阶段发挥了重要作用，在实现高存活率的冠。遵循经批准的程序手册以及制作手册，并由高级指导员仔细检查，也被认为有助于提高牙冠的存活率。
Purpose : The goal of this study was to clarify the frequency and reasons for crown failure, based on the longevity and quality of full coverage crowns evaluated in 226 patients.Materials and Methods : Of a total of 529 patients who received full coverage crowns between 1980 and 1987 at the student clinic, 226 (42.7%) responded to a request to attend a recall examination. The crowns were fabricated and delivered in a uniform way according to the students' clinical manual used in the Department of Fixed Prosthodontics, School of Dentistry, Iwate Medical University.Results : The 226 participants (61 men and 165 women with a mean age of 41.6 years) attended a recall examination between 1996 and 1997. Periodontal pocket depth was 2.2±0.1 mm (mean±S.D.) at the initial examination and 2.2±0.8 mm (mean±S.D.) at the recall examination. The gingival index at the initial visit indicated that 90.3% of recall subjects had either slight gingival inflammation or none at all. A 10-16 year follow-up examination on the 388 crowns revealed that 38 crowns (9.8%) were lost or replaced due to periodontal disease, caries, and/or fracture. Of the failed crowns, 19 abutments were extracted, 11 crowns were removed and remade as an abutment of a fixed bridge, and 8 crowns were replaced by new crowns. The survival rates of the crowns at 5, 10 and 16 years after placement were 96.9, 93.3, and 84.9%, respectively.Conclusion : Although the recall rate of this follow-up study was low, it is suggested that the periodontal status at the initial stage of treatment played an important role in achieving a high survival rate of the crown. Following an approved procedural manual together with a fabrication manual and careful checking by a senior instructor were also thought to contribute to the excellent survival rate of the crowns.