Juntavee Niwut, Juntavee Apa, Srisontisuk Supichaya
Department of Prosthodontics, Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand.
Division of Pediatric Dentistry, Department of Preventive Dentistry, Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand.
J Prosthodont. 2023 Apr;32(S1):20-28. doi: 10.1111/jopr.13549. Epub 2022 Jun 16.
Durability of provisional restoration is crucial for full-mouth reconstruction, which may be influenced by aging. This study evaluated the effect of aging on the flexural strength of provisional materials for oral rehabilitation.
Bar specimens (2×2×25 mm) were fabricated from CAD-CAM [Vita CAD-Temp (VC), Telio CAD (TC), artBloc (RC)], autopolymerized [Protemp™IV (PA), Luxatemp (LA), Unifast™Trad (UA)], and heat-polymerized polymer [Major C & B; (MH)]. Each was divided into aging (AG, 5000 thermocycles of 5°/55°C) and nonaging groups (NG, n = 15/group). Flexural strength (σ, MPa) was determined in a universal testing machine at 1 mm/min crosshead speed. An analysis of variance and multiple comparisons were determined for significant difference (α = 0.05).
TCNG indicated the highest mean of σ (133.49 ±4.32), whereas VCNG indicated the lowest mean of σ (84.62 ±3.73) for nonaging. Upon aging process, TCAG revealed the highest mean of σ (123.11 ±4.55), while VCAG possessed the lowest mean of σ (84.05 ±6.39). Significant differences among various provisional materials were indicated (p = 0.001). Aging significantly affected flexural strength (p = 0.001).
The CAD-CAM provisional material possessed higher flexural strength than heat-polymerized PMMA and autopolymerized PMMA, which was suggested as a provisional material for rehabilitation. Aging reduced strength for all materials tested.
临时修复体的耐久性对于全口重建至关重要，其可能会受到老化的影响。本研究评估了老化对口腔修复临时材料弯曲强度的影响。
从计算机辅助设计与制造（CAD-CAM）材料[维他CAD-Temp（VC）、Telio CAD（TC）、artBloc（RC）]、自凝材料[Protemp™IV（PA）、Luxatemp（LA）、Unifast™Trad（UA）]以及热凝聚合物材料[Major C & B；（MH）]制作条形试件（2×2×25毫米）。每组试件均分为老化组（AG，5000次5°/55°C热循环）和未老化组（NG，每组n = 15）。在万能试验机上以1毫米/分钟的十字头速度测定弯曲强度（σ，兆帕）。采用方差分析和多重比较确定显著差异（α = 0.05）。
对于未老化组，TCNG的σ均值最高（133.49 ± 4.32），而VCNG的σ均值最低（84.62 ± 3.73）。经过老化处理后，TCAG的σ均值最高（123.11 ± 4.55），而VCAG的σ均值最低（84.05 ± 6.39）。不同临时材料之间存在显著差异（p = 0.001）。老化显著影响弯曲强度（p = 0.001）。
CAD-CAM临时材料的弯曲强度高于热凝PMMA和自凝PMMA，建议将其作为修复用临时材料。老化会降低所有测试材料的强度。
