Pediatric Dentistry, Preventive Dentistry, and Dental Public Health Department, Faculty of Dentistry, Suez University, Suez, Egypt.
Pediatric Dentistry, Oral Health and Preventive Dentistry Department, Faculty of Dentistry, Tanta University, Tanta, Egypt.
Sci Rep. 2024 Aug 11;14(1):18640. doi: 10.1038/s41598-024-68689-w.
Rehabilitation of pulpotomized primary molars with an appropriate restoration is essential for recovering function and safeguarding the durability of the treatment. This study aimed to assess and compare the surface roughness of stainless steel (ST) crowns, zirconia (ZR) crowns, fiberglass (FG) crowns, and lithium disilicate (LD) endo-crowns as a restoration for pulpotomized primary molars also, evaluating the surface roughness of their antagonists. Sixty pulpotomized primary mandibular first molars were used for qualitative surface roughness evaluation and divided into four groups (n = 15/group) according to the crown type (group-ST, group-ZR, group-FG, group-LD). While the other sixty sound, unprepared primary maxillary first molars were used for evaluation of their surface roughness against the tested crowns. Specimens' preparation and cementation were carried out according to each crown type and manufacturer's instructions. The surface roughness was done using a two-body wear test. The data were statistically analyzed. All tested crowns showed an increased change in surface roughness, except group-ZR, which had the least change in surface roughness after mechanical wear with no statistically significant difference(P = 0.681). All crown types significantly increased the surface roughness of their antagonists after mechanical wear, except group-ST which showed insignificant affection (p ≥ 0.05). Zirconia crowns and lithium disilicate endo-crowns had the least change in surface roughness compared to other groups while SSCs showed the least tooth loss in the antagonist enamel.
对已行活髓切断术的乳磨牙进行适当的修复对于恢复功能和保障治疗的耐久性至关重要。本研究旨在评估和比较不锈钢（ST）冠、氧化锆（ZR）冠、玻璃纤维（FG）冠和锂硅二酸盐（LD）嵌体作为已行活髓切断术的乳磨牙修复体的表面粗糙度，同时评估其对颌牙的表面粗糙度。将 60 颗下颌乳切牙随机分为 4 组（n=15/组），根据冠类型（ST 组、ZR 组、FG 组和 LD 组）进行定性表面粗糙度评估。同时，将 60 颗未处理的上颌正常乳切牙随机分为 4 组，用于评估与测试冠的表面粗糙度。根据每个冠类型和制造商的说明进行样本制备和粘固。使用双体磨损试验进行表面粗糙度测量。对数据进行统计学分析。除 ZR 组外，所有测试冠的表面粗糙度均有增加，而 ZR 组的表面粗糙度在机械磨损后变化最小，差异无统计学意义（P=0.681）。所有冠类型在机械磨损后均显著增加了对颌牙的表面粗糙度，除 ST 组外，差异无统计学意义（P≥0.05）。与其他组相比，氧化锆冠和锂硅二酸盐嵌体的表面粗糙度变化最小，而 SSCs 对颌牙釉质的牙体损耗最小。
