Coelho Sérgio Murilo, Pandolfo Mariana Travi, Bortoluzzi Eduardo Antunes, Rossetto Hebert Luís, Pereira Roberta Pinto, Minamisako Mariana Comparotto, Rodrigues Paulo Marcelo, Netto Vicente Ribeiro, Ramos Tatiana da Silva, Teixeira Cleonice da Silveira, Garcia Lucas da Fonseca Roberti
Department of Dentistry - Endodontics Division, Health Sciences Center, Federal University of Santa Catarina, Florianópolis, SC, Brazil.
Department of Diagnosis & Oral Health - Endodontics Division, University of Louisville, Louisville, Kentucky, USA.
Int J Paediatr Dent. 2024 Jan;34(1):3-10. doi: 10.1111/ipd.13073. Epub 2023 Apr 21.
The literature is scanty regarding the effect of radiation therapy (RT) on the mechanical properties of immature permanent teeth.
To evaluate the effect of RT on the fracture resistance of simulated immature teeth submitted to different types of root reinforcement.
Sixty-four human teeth simulating the Cvek stage 3 of root development were distributed into eight groups (n = 8), according to exposure or not to RT (70 Gy) and the root reinforcement method: Group NR (control)-no reinforcement/no RT; Group NR + RT (control)-no reinforcement/RT; Group PO-tricalcium silicate-based cement (TS) apical plug/canal obturation/no RT; Group PO + RT-TS apical plug/canal obturation/RT; Group TS-canal filling with TS/no RT; Group TS + RT-canal filling with TS/RT; Group FP-TS apical plug/fibreglass post/no RT; and Group FP + RT-TS apical plug/fibreglass post/RT. Fracture resistance was determined using a universal testing machine (0.5 mm/min).
In the intergroup comparison, nonirradiated teeth had higher fracture resistance (p < .05). Groups FP and FP + RT had higher fracture resistance (p < .001).
Radiotherapy affected the fracture resistance of simulated immature teeth. Reinforcement with fibreglass posts increased the fracture resistance, regardless of the radiation.
关于放射治疗（RT）对未成熟恒牙力学性能影响的文献较少。
评估RT对接受不同类型牙根强化的模拟未成熟牙齿抗折性的影响。
根据是否接受RT（70 Gy）以及牙根强化方法，将64颗模拟牙根发育Cvek 3期的人牙分为8组（n = 8）：NR组（对照组）-无强化/无RT；NR + RT组（对照组）-无强化/RT；PO组-硅酸三钙基水泥（TS）根尖充填/根管充填/无RT；PO + RT组-TS根尖充填/根管充填/RT；TS组-根管充填TS/无RT；TS + RT组-根管充填TS/RT；FP组-TS根尖充填/玻璃纤维桩/无RT；以及FP + RT组-TS根尖充填/玻璃纤维桩/RT。使用万能试验机（0.5 mm/min）测定抗折性。
组间比较中，未照射牙齿具有更高的抗折性（p <.05）。FP组和FP + RT组具有更高的抗折性（p <.001）。
放射治疗影响模拟未成熟牙齿的抗折性。无论是否接受放射，使用玻璃纤维桩进行强化均可提高抗折性。
