Venkataraman Karunakaran Jeyaraman, Venkatapathi Aravindhan, Balasubramanian Sathyanarayanan, Palanivelu Chandrika Ramanathan, Swaminathan Senthil Kumar, Samuel Leo Sujith, Thanapathi Sathya
Department of Conservative Dentistry, JKK Nataraja Dental College and Hospital, Komarapalayam, Tamil Nadu, India.
J Pharm Bioallied Sci. 2021 Nov;13(Suppl 2):S1597-S1602. doi: 10.4103/jpbs.jpbs_308_21. Epub 2021 Nov 10.
This study aims to compare fracture resistance of mandibular first molars reinforced with diagonally placed horizontal posts after endodontic therapy.
Thirty-two mandibular first molar teeth were selected, standardized, divided into four groups (GP) - GP I (endodontically treated-no post)), GP II (horizontal post-buccolingual), GP III (horizontal postdiagonal), and GP IV (natural teeth). The individual teeth were mounted on bases, coded, and suitably prepared for the facture testing procedure.
Buccolingual type of fracture was the most common among the experimental groups with a percentage of incidence of 37.50%. The cuspal type of fracture was the next most common with a percentage of incidence of 25.0%. The incidence of mesiodistal, comminuted, and proximal type of fractures was also observed and had a percentage of incidence of 9.38%, 9.38%, and 9.38%, respectively. Group IV had the highest fracture resistance with a mean value of 1279.82 (N). Group I, Group II, and Group III had mean values of 684.16(N), 756.84(N), and 758.17(N), respectively. There was a statistically significant difference between Gp IV and Gp (I-III) in load values of root fracture ( < 0.05).
Within the limitations of this study, it can be concluded that diagonally placed horizontal postdesign has a higher resistance to facture when compared to buccolingually place horizontal postdesign and root canal treated non postgroup. These designs have the potential to be a conservative postendodontic management option. Further evaluation of different horizontal postdesigns and assessment in a clinical setting is recommended.
本研究旨在比较根管治疗后用斜向放置的水平桩增强的下颌第一磨牙的抗折性。
选取32颗下颌第一磨牙，进行标准化处理，分为四组（GP）——GP I（根管治疗后无桩）、GP II（颊舌向水平桩）、GP III（斜向水平桩）和GP IV（天然牙）。将各颗牙齿安装在基座上，编码，并为骨折测试程序进行适当准备。
在实验组中，颊舌向骨折类型最为常见，发生率为37.50%。尖部骨折类型次之，发生率为25.0%。还观察到近远中、粉碎性和近端骨折类型的发生率，分别为9.38%、9.38%和9.38%。GP IV组的抗折性最高，平均值为1279.82（N）。GP I组、GP II组和GP III组的平均值分别为684.16（N）、756.84（N）和758.17（N）。GP IV组与GP（I - III）组在牙根骨折负荷值上存在统计学显著差异（<0.05）。
在本研究的局限性内，可以得出结论，与颊舌向放置的水平桩设计和根管治疗后无桩组相比，斜向放置的水平桩设计具有更高的抗折性。这些设计有可能成为一种保守的根管治疗后管理选择。建议进一步评估不同的水平桩设计并在临床环境中进行评估。
