PDF(Pubmed)
Abstract：
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.
摘要：
通过适当的修复来修复被切除的原发性磨牙对于恢复功能和维护治疗的持久性至关重要。本研究旨在评估和比较不锈钢（ST）冠的表面粗糙度，氧化锆（ZR）冠，玻璃纤维（FG）冠，和二硅酸锂（LD）内牙冠作为牙髓切除的初级磨牙的修复，评估其拮抗剂的表面粗糙度。对60颗下颌第一磨牙进行定性表面粗糙度评估，并根据牙冠类型分为四组（n=15/组）（ST组，组-ZR,group-FG,group-LD)。而其他六十个声音，未准备的上颌第一磨牙用于评估其相对于测试牙冠的表面粗糙度。根据每种牙冠类型和制造商的说明进行样品制备和胶结。使用两体磨损测试进行表面粗糙度。对数据进行统计学分析。所有测试的牙冠显示表面粗糙度变化增加，除了组-ZR,机械磨损后表面粗糙度变化最小,差异无统计学意义(P=0.681)。所有牙冠类型在机械磨损后都显着增加了其对手的表面粗糙度，除ST组无明显影响外(p≥0.05)。与其他组相比，氧化锆冠和二硅酸锂内冠的表面粗糙度变化最小，而SSC在拮抗剂釉质中的牙齿损失最小。
