背景:由于持续的牙槽脊吸收,数字制作义齿可能需要换衬。然而,缺乏评估与义齿衬垫粘合的数字制造义齿的拉伸粘合强度(TBS)的研究。本研究旨在评估自聚合的TBS,热聚合,碾磨,和3D打印义齿基托材料粘合到2个丙烯酸基和2个有机硅基牙衬垫,在热循环之前和之后。此外,还评估了热循环对TBS的影响。
方法:4种不同义齿基托材料的TBS(Palapress(PL),顶点快速简化(VR),微笑CAM总假体(SC),和NextDent义齿3D(ND))粘合到2个丙烯酸基(GC软衬垫(GC)和TokuyamaRebaseII(RB))和2个有机硅基(UfiGelP(UP)和SofrelinerToughM(ST))义齿衬垫进行了测试。样品(n=8)分为非热循环和热循环组。非热循环试样在24小时水浸后进行测试,而热循环标本进行了5000个周期,并立即进行了测试。在立体显微镜下检查故障模式。数据采用双向方差分析和TukeyHSD检验(α=0.05),非热循环组和热循环组之间TBS的独立样本t检验(α=0.05)。
结果:对于非热循环组,在相同的义齿衬垫材料内,义齿基托材料之间没有发现显著差异,除ND+RB组外,TBS显著降低。对于热循环组,在相同的义齿衬垫材料内,PL组TBS最高,ND组最低。在相同的义齿基托材料内,在非热循环和热循环组中,ST组的TBS表现最高;相比之下,在GC组中表现最低。在非热循环组和热循环组之间的TBS没有观察到显著差异,除与ST组粘合的义齿基托材料外,SC+UP,和ND+UP组。
结论:铣削义齿基托可以与丙烯酸基或硅酮基义齿衬垫一起使用。然而,更换3D打印义齿基托时应注意。热循环不会影响丙烯酸基义齿衬垫和义齿基托之间的TBS。相比之下,它影响了硅胶基义齿衬垫和义齿基托之间的结合。
BACKGROUND: Digitally fabricated dentures may require relining due to continual alveolar ridge resorption. However, studies evaluating the tensile bond strength (TBS) of digitally fabricated dentures bonded to denture liners are lacking. This study aimed to evaluate the TBS of autopolymerized, heat-polymerized, milled, and 3D printed denture base materials bonded to 2 acrylic-based and 2 silicone-based denture liners, both before and after thermocycling. Additionally, the impact of thermocycling on the TBS were also evaluated.
METHODS: The TBS of 4 different denture base materials (Palapress (PL), Vertex Rapid Simplified (VR), Smile CAM total prosthesis (SC), and NextDent denture 3D+ (ND)) bonded to 2 acrylic-based (GC Soft-Liner (GC) and Tokuyama Rebase II (RB)) and 2 silicone-based (Ufi Gel P (UP) and Sofreliner Tough M (ST)) denture liners were tested. Specimens (n = 8) were divided into non-thermocycling and thermocycling groups. Non-thermocycling specimens were tested after 24-hours water immersion, while thermocycling specimens were underwent 5000 cycle and were immediately tested. Mode of failure was examined under a stereomicroscope. Data were analyzed using 2-way ANOVA and Tukey HSD tests (α = 0.05), and independent samples t test (α = 0.05) for TBS between non-thermocycling and thermocycling groups.
RESULTS: For the non-thermocycling groups, within the same denture liner material, no significant differences were found between denture base materials, except the ND + RB group, which had significantly lower TBS. For the thermocycling groups, within the same denture liner material, the TBS in the PL group exhibited the highest and the ND group exhibited the lowest. Within the same denture base material, in both non-thermocycling and thermocycling groups, the TBS in the ST group exhibited the highest; in contrast, that in the GC group exhibited the lowest. No significant differences were observed in TBS between non-thermocycling and thermocycling groups, except for denture base materials bonded to the ST group, SC + UP, and ND + UP groups.
CONCLUSIONS: Milled denture base can be relined with acrylic-based or silicone-based denture liner. However, cautions should be exercised when relining 3D printed denture base. Thermocycling did not affect TBS between acrylic-based denture liners and denture bases. In contrast, it affected the bond between silicone-based denture liner and denture base.