Oral Health Prev Dent. 2022 Jun 28;20:271-278. doi: 10.3290/j.ohpd.b3170031.
Conservative restorations of endodontically treated premolars have yielded mixed results. The present study aimed to compare fracture resistance of endodontically treated premolars with Class II mesial-occlusal cavity preparations, restored with either Smart Dentin Replacement (SDR; Dentsply Sirona) material, Biodentine (Septodont) or ceramic inlays.
Thirty-two extracted premolars were randomly divided into four equal groups (n = 8): Group 1 served as a control group with teeth left intact; teeth in the remaining three groups received root canal treatment followed by a mesio-occlusal cavity preparation. These crowns were restored with: Biodentine in group 2, SDR in group 3 and ceramic inlays in group 4. A computer-controlled Instron universal testing machine subjected all specimens to compressive load until failure. Force at failure and fracture mode (above or below the cementoenamel junction) were recorded. The data were analysed using Fisher's exact test and one-way ANOVA followed by the post-hoc Tukey's test. Statistical significance was set at p < 0.05.
The lowest mean load at failure was recorded for the inlay group. Loads at failure were statistically significantly higher for teeth restored with Biodentine than with SDR (p = 0.012) and ceramic inlays (p = 0.007). There were no statistically significant differences between the groups in terms of fracture mode (p = 0.440).
Endodontically treated premolars with mesial-occlusal cavity preparation restored with Biodentine were more resistant to fracture than those restored with either SDR or ceramic inlays. Biodentine may prove a promising material to restore endodontically treated teeth with one missing proximal wall.
根管治疗后的前磨牙的保守修复效果不一。本研究旨在比较使用 Smart Dentin Replacement（SDR；登士柏西诺德）材料、Biodentine（赛普敦）或陶瓷嵌体修复近中-𬌗面 II 类洞型的根管治疗后的前磨牙的抗折能力。
32 颗离体前磨牙随机分为四组（n = 8）：第 1 组为对照组，牙齿保持完整；其余三组进行根管治疗后，制备近中-𬌗面洞型。这些牙冠分别用以下材料修复：第 2 组用 Biodentine，第 3 组用 SDR，第 4 组用陶瓷嵌体。所有样本均用电脑控制的 Instron 万能试验机进行压缩加载直至破坏。记录破坏时的力和破坏模式（牙釉牙骨质界上方或下方）。使用 Fisher 确切检验和单向方差分析，随后进行 Tukey 事后检验对数据进行分析。统计显著性设为 p < 0.05。
嵌体组的平均破坏载荷最低。用 Biodentine 修复的牙齿的破坏载荷明显高于用 SDR（p = 0.012）和陶瓷嵌体（p = 0.007）修复的牙齿。各组的破坏模式无统计学差异（p = 0.440）。
与用 SDR 或陶瓷嵌体修复相比，用 Biodentine 修复近中-𬌗面洞型的根管治疗后的前磨牙具有更高的抗折能力。Biodentine 可能是修复缺失近中壁的根管治疗牙的一种有前途的材料。
