Tiplady Lucy, Karia Sadie
Glasgow Dental Hospital, Glasgow, UK.
Evid Based Dent. 2024 Sep;25(3):152-153. doi: 10.1038/s41432-024-01053-z. Epub 2024 Aug 25.
A multi-centre randomised controlled trial was conducted with paediatric patients requiring crowns after pulp therapy. Participants were randomly divided into two groups: Stainless Steel Crown (SCC) (n = 28) and Resin Crown (RC) (n = 28). RCs were fabricated using a 3D printer with a standardised manufacturing process. The assessment was through periapical radiographs, photographs, quantitative light-induced fluorescence, impressions, and clinical assessment. Quigley-Hein plaque index (QHI), gingival index (GI), occlusal wear, and survival were evaluated.
Participants were selected from two departments of paediatric dentistry at Yonsei University and Kyung Hee University of Dental College. Patients were between 4-7 years old. The tooth must require pulp therapy and crown, be in place for at least 2 years, and be in stable occlusion. Those with systemic illness, disability, poor cooperation, temporomandibular joint disorder, and bruxism were excluded.
Analysis was performed at 1 week, 3 months, 6 months and 12 months. QHI and GI were compared between the two groups. Shapiro-Wilk test was used to analyse the normal distribution of occlusal wear. Comparison was completed using Mann-Whitney U and independent t-tests. Survival rates were assessed using Kaplan-Meier analysis and log-rank tests.
Fifty-six teeth were included initially, with follow-up on 23 RCs and 25 SSCs due to failure or lack of attendance. RCs exhibited a statistically significant increase in wear, with mean root mean square (RMS) values of 0.064 (+/-0.02) at 3 months, 0.079 (+) at 6 months, and 0.125 (+/-0.05) at 12 months. Whereas SSCs demonstrated minimal wear, with mean RMS values ranging from 0.021 (+/-0.01) to 0.025 (+/-0.01). The QHI scores indicated no significant difference, except at 1 week where RC exhibited increased plaque. The GI scores for RCs were significantly higher at 12 months. The survival rate of RCs was significantly lower (82.1%) compared to SSCs (100%).
While RCs offer improved aesthetics over SSCs, they exhibit lower wear resistance and higher plaque accumulation and gingival inflammation. The survival rate of RCs is significantly lower due to fractures. The clinical effectiveness of RCs has not yet been established.
对牙髓治疗后需要做牙冠的儿科患者进行了一项多中心随机对照试验。参与者被随机分为两组：不锈钢冠组（SCC）（n = 28）和树脂冠组（RC）（n = 28）。树脂冠采用3D打印机通过标准化制造工艺制作。通过根尖片、照片、定量光诱导荧光、印模和临床评估进行评估。评估了Quigley - Hein菌斑指数（QHI）、牙龈指数（GI）、咬合磨损和存留情况。
参与者选自延世大学和庆熙大学牙科学院的两个儿童牙科科室。患者年龄在4至7岁之间。患牙必须需要牙髓治疗和做牙冠，已在位至少2年，且咬合稳定。排除患有全身性疾病、残疾、合作性差、颞下颌关节紊乱和磨牙症的患者。
在1周、3个月、6个月和12个月时进行分析。比较两组之间的QHI和GI。使用Shapiro - Wilk检验分析咬合磨损的正态分布。使用Mann - Whitney U检验和独立t检验完成比较。使用Kaplan - Meier分析和对数秩检验评估存留率。
最初纳入56颗牙齿，由于失败或未复诊，对23颗树脂冠和25颗不锈钢冠进行了随访。树脂冠的磨损有统计学显著增加，3个月时平均均方根（RMS）值为0.064（±0.02），6个月时为0.079（+），12个月时为0.125（±0.05）。而不锈钢冠的磨损极小，平均RMS值在0.021（±0.01）至0.025（±0.01）之间。QHI评分显示无显著差异，除了在1周时树脂冠的菌斑有所增加。树脂冠组的GI评分在12个月时显著更高。树脂冠的存留率（82.1%）显著低于不锈钢冠组（100%）。
虽然树脂冠比不锈钢冠美观性更好，但它们的耐磨性较低，菌斑堆积和牙龈炎症更高。由于折断，树脂冠的存留率显著更低。树脂冠的临床有效性尚未确立。
