Clinical success of zirconium oxide posts with resin composite or glass-ceramic cores in endodontically treated teeth: a 4-year retrospective study

[1]Paul S. J., Werder P. Clinical success of zirconium oxide posts with resin composite or glass-ceramic cores in endodontically treated teeth: a 4-year retrospective study. International Journal of Prosthodontics, 2004, 17(5): 524-528

PURPOSE: This study retrospectively evaluated zirconium oxide posts with either direct resin composite cores or indirect glass-ceramic cores after several years of clinical service.

MATERIALS AND METHODS: One hundred forty-five endodontically treated teeth in 88 patients were restored with zirconium oxide posts; 87 teeth were restored with direct composite cores, and 58 were restored with Empress cores prior to crowning. Seventy-nine posts with direct composite cores in 52 patients and 34 posts with glass-ceramic cores in 19 patients were reevaluated clinically and radiographically after a mean clinical service of 57.7 months and 46.3 months, respectively.

RESULTS: Periodontal probing depths remained on a healthy clinical level, and esthetics were judged excellent for the majority of teeth in both groups. In the group with direct composite cores, no failures were observed in the 79 posts that were reevaluated. In the group with indirect glass-ceramic cores, three failures were observed after 42, 43, and 55 months of clinical service. All failures were due to loss of retention. In a best-case scenario posts that could not be reevaluated were considered successful, and in a worst-case scenario they were considered failures; respective success rates were 100% and 91% in the direct group and 95% and 53% in the indirect group.

CONCLUSION: The observed clinical success of zirconium oxide posts with direct composite cores suggests that this method of post-and-core reconstruction is clinically promising. Zirconium oxide posts with indirect glass-ceramic cores displayed a significantly higher failure rate and a high dropout rate that precludes valid conclusions.

目的：本回顾性研究对氧化锆桩配合直接树脂核或间接瓷核进行了临床评价。

材料与方法：88位患者的145个患牙中87颗为直接树脂核，随访到52位患者（79颗），平均57.7个月。58颗为瓷核，随访到19位患者（34颗），平均46.3个月。评估主要包括临床和放射学评价。

结果：牙周探诊维持在临床健康水平，美观效果非常好。直接树脂核组没有发现失败病例。瓷核组发现3例失败，分别出现在42、43和55个月后。所有失败都是由于脱落。如果按最好结果计算，未随访者视为成功。两组成功率分别为100%和91%。如果按最差结果计算，未随访者视为失败。两组成功率为95%和53%。

结论：观察到的直接树脂核配合瓷桩的临床成功提示该方法有很好的临床前景。氧化锆桩配合瓷核显示出显著高的失败率和失访率妨碍作出有效的结论。