Thais Piragine Leandrin, DDS, MSc, PhD, Restorative Dentistry Department, Araraquara Dental School, Univ Estadual Paulista, Araraquara, São Paulo, Brazil.
*Eduardo Fernández, DDS, PhD, Professor Titular, Universidad de Chile Facultad de Odontologia, Santiago, Chile and Instituto de Ciencias Biomédicas, Universidad Autónoma de Chile, Providencia, Santiago, Chile.
Oper Dent. 2022 Jan 1;47(1):E22-E34. doi: 10.2341/20-117-L.
This study aimed to evaluate the effect of fiber post customization on the bond strength (24 hours and 6 months), resin cement thickness, and dentinal penetrability of Adper Scotchbond Multi-Purpose - RelyX ARC (AS-RA), RelyX U200 (R2), and Scotchbond Universal - RelyX Ultimate (SU-RU) cementation systems to root dentin from the cervical-, middle-, and apical-thirds of the post space.
One hundred twenty bovine incisors were endodontically treated. After post space preparation, the roots were divided into six groups, according to the luting protocols (AS-RA, R2, SU-RU) and the type of fiber post [noncustomized post (NC) and customized post (C)]. Customization procedures were peformed using a resin composite (Z350 XT). 24 hours (n=60) or 6 months later (n=60), specimens from the cervical-, middle-, and apical-thirds of the post space were submitted to cementation system thickness measurement, bond strength evaluation, and dentinal penetrability analysis with Confocal Laser Scanning Microscopy (CLSM). Failure mode was classified as adhesive, cohesive, or mixed. Data were submitted to ANOVA and Tukey tests (α=0.05).
Cementation protocols with customized fiber posts presented the lowest cementation system thickness, regardless of the cementation system or post space-third (p<0.05), and the highest bond strength values (p<0.05), regardless of the third space (p>0.05), for both periods (24 hours or 6 months). The comparison of push-out bond strength values between 24 hours and 6 months showed a reduction in all groups for the cervical-third (p<0.05). For the middle-third, only noncustomized groups showed reduction (p<0.05). For the apical-third, no reduction was observed (p>0.05).
Anatomical customization favored both the bond strength of cements to dentin and the dentinal penetrability, but with lower cementation system thickness, regardless of cement composition and adhesive strategy.
本研究旨在评估纤维桩定制对 Adper Scotchbond Multi-Purpose - RelyX ARC（AS-RA）、RelyX U200（R2）和 Scotchbond Universal - RelyX Ultimate（SU-RU）粘接系统与根管牙本质之间的粘接强度（24 小时和 6 个月）、树脂水泥厚度和牙本质渗透性的影响，用于从根管颈-中-根尖三分之一处制备的纤维桩粘接。
120 颗牛切牙进行根管治疗。根管预备后，根据粘接剂系统（AS-RA、R2、SU-RU）和纤维桩类型[非定制桩（NC）和定制桩（C）]将牙根分为六组。定制程序使用树脂复合材料（Z350 XT）进行。24 小时（n=60）或 6 个月后（n=60），从根管颈-中-根尖三分之一处的样本进行粘接系统厚度测量、粘接强度评估和牙本质渗透性分析，采用共聚焦激光扫描显微镜（CLSM）。失效模式分为粘接性、内聚性或混合性。数据采用方差分析和 Tukey 检验（α=0.05）。
无论粘接系统或根管空间三分之一如何，使用定制纤维桩的粘接剂系统均表现出最低的粘接剂系统厚度（p<0.05）和最高的粘接强度值（p<0.05），在两个时期（24 小时或 6 个月）均无差异。24 小时和 6 个月的推出粘接强度值比较显示，所有组的颈三分之一均有降低（p<0.05）。对于中三分之一，只有非定制组显示出降低（p<0.05）。对于根尖三分之一，未观察到降低（p>0.05）。
解剖学定制有利于粘接剂与牙本质的粘接强度和牙本质渗透性，但无论粘接剂成分和粘接策略如何，粘接系统厚度都较低。
