Kim Jae-Hoon, Eo Soo-Heang, Shrestha Reetu, Ihm Jung-Joon, Seo Deog-Gyu
Department of Dental Education, Dental and Life Science Institute, School of Dentistry, Pusan National University, Dental Research Institute, Yangsan, Republic of Korea.
HUTOM Inc., Seoul, Republic of Korea.
J Dent. 2020 Oct;101:103466. doi: 10.1016/j.jdent.2020.103466. Epub 2020 Aug 31.
This study investigated the distribution of longitudinal tooth fractures (LTFs) according to the patient's age and analyzed the association between visual detection methods and the types of LTFs.
Patients with symptomatic teeth with LTFs were examined at the department of conservative dentistry in a dental hospital from September 1, 2009 to March 31, 2014. Naked eye examination, staining with a dye, operating microscopy, transillunimation, and periapical radiography were used to identify the fracture lines. Diagnostic surgery was performed to visualize the fracture line in some cases with vertical root fractures. The final diagnosis was based on the American Association of Endodontists (AAE) classification: cracked tooth, fractured cusp, split tooth, and vertical root facture. The probability density function for each type of LTF was calculated to assess the risks of LTF development according to age. The association between the detection methods and types of LTFs was identified using the association plot.
A total of 245 teeth with LTFs were enrolled. Overall, 71.8% of LTFs was observed in patients aged 40-69 years, and 65.7% of LTFs were diagnosed as cracked teeth. The mean age in patients with cracked teeth was 49.3 years, while the mean age in patients with fractured cusps was 59.1 years. A significant association was observed between the detection method and type of LTF (p < 0.001).
Cracked tooth was the most common type of LTF. The probability of occurrence of cracked teeth peaked in patients aged approximately 50 years, while the probability of occurrence of fractured cusps peaked in patients aged approximately 60 years. Cracked teeth were detected most often using transillumination.
LTFs occurred mostly in patients aged 40 years and older. Transillumination is useful for the diagnosis of cracked teeth.
本研究根据患者年龄调查纵向牙齿骨折（LTFs）的分布情况，并分析视觉检测方法与LTFs类型之间的关联。
2009年9月1日至2014年3月31日期间，在一家牙科医院的保守牙科科室对有症状的LTFs牙齿患者进行检查。采用肉眼检查、染料染色、手术显微镜检查、透照法和根尖X线片来确定骨折线。在一些垂直根折病例中进行诊断性手术以观察骨折线。最终诊断基于美国牙髓病学家协会（AAE）分类：牙隐裂、牙尖折断、牙裂和垂直根折。计算每种类型LTF的概率密度函数，以评估根据年龄发生LTF的风险。使用关联图确定检测方法与LTFs类型之间 的关联。
共纳入245颗有LTFs的牙齿。总体而言，71.8%的LTFs见于40 - 69岁的患者，65.7%的LTFs被诊断为牙隐裂。牙隐裂患者的平均年龄为49.3岁，而牙尖折断患者的平均年龄为59.1岁。观察到检测方法与LTF类型之间存在显著关联（p < 0.001）。
牙隐裂是LTF最常见的类型。牙隐裂的发生概率在约50岁的患者中达到峰值，而牙尖折断的发生概率在约60岁的患者中达到峰值。牙隐裂最常通过透照法检测到。
LTFs大多发生在40岁及以上的患者中。透照法对牙隐裂的诊断有用。
