1.Hugoson A, Jordan T: Frequency distribution of individuals aged 20–70 years according to severity of periodontal disease. Community Dent Oral Epidemiol 1982, 10(4):187–192.
2.American Academy of Periodontology Task Force Report on the Update to the 1999 Classification of Periodontal Diseases and Conditions. Journal of periodontology 2015, 86(7):835–838.
3.Armitage GC, Research S, Therapy Committee of the American Academy of P: Diagnosis of periodontal diseases. J Periodontol 2003, 74(8):1237–1247.
4.Akesson L, Hakansson J, Rohlin M: Comparison of panoramic and intraoral radiography and pocket probing for the measurement of the marginal bone level. Journal of clinical periodontology 1992, 19(5):326–332.
5.Albandar JM: Validity and reliability of alveolar bone level measurements made on dry skulls. Journal of clinical periodontology 1989, 16(9):575–579.
6.Jeffcoat MK, Reddy MS: Digital subtraction radiography for longitudinal assessment of peri-implant bone change: method and validation. Advances in dental research 1993, 7(2):196–201.
7.Mol A: Imaging methods in periodontology. Periodontology 2000 2004, 34:34–48.
8.Hujoel PP: A meta-analysis of normal ranges for root surface areas of the permanent dentition. Journal of clinical periodontology 1994, 21(4):225–229.
9.Gu Y, Tang Y, Zhu Q, Feng X: Measurement of root surface area of permanent teeth with root variations in a Chinese population-A micro-CT analysis. Archives of oral biology 2016, 63:75–81.
10.Hong HH, Chang CC, Hong A, Liu HL, Wang YL, Chang SH, Yen TH: Decreased Amount of Supporting Alveolar Bone at Single-Rooted Premolars Is Under Estimated by 2D Examinations. Sci Rep 2017, 8:45774.
11.Nunn ME, Fan J, Su X, Levine RA, Lee HJ, McGuire MK: Development of prognostic indicators using classification and regression trees for survival. Periodontology 2000 2012, 58(1):134–142.
12.Penny RE, Kraal JH: Crown-to-root ratio: its significance in restorative dentistry. The Journal of prosthetic dentistry 1979, 42(1):34–38.
13.Avila G, Galindo-Moreno P, Soehren S, Misch CE, Morelli T, Wang HL: A novel decision-making process for tooth retention or extraction. Journal of periodontology 2009, 80(3):476–491.
14.McGuire MK, Nunn ME: Prognosis versus actual outcome. II. The effectiveness of clinical parameters in developing an accurate prognosis. Journal of periodontology 1996, 67(7):658–665.
15.McGuire MK, Nunn ME: Prognosis versus actual outcome. III. The effectiveness of clinical parameters in accurately predicting tooth survival. Journal of periodontology 1996, 67(7):666–674.
16.Kato A, Ohno N: Construction of three-dimensional tooth model by micro-computed tomography and application for data sharing. Clinical oral investigations 2009, 13(1):43–46.
17.Parsa A, Ibrahim N, Hassan B, van der Stelt P, Wismeijer D: Bone quality evaluation at dental implant site using multislice CT, micro-CT, and cone beam CT. Clinical oral implants research 2015, 26(1):e1–7.
18.Ferraz C, Freire AR, Mendonca JS, Fernandes CA, Cardona JC, Yamauti M: Effectiveness of Different Mechanical Methods on Dentin Caries Removal: Micro-CT and Digital Image Evaluation. Operative dentistry 2015, 40(3):263–270.
19.Hong H-H, Liu H-L, Hong A, Chao P: Inconsistency in the Crown-to-Root Ratios of Single-Rooted Premolars Measured by 2D and 3D Examinations. Scientific Reports 2017, 7(1):16484.
20.Hong HH, Hong A, Huang YF, Liu HL: Incompatible amount of 3-D and 2-D periodontal attachments on micro-CT scanned premolars. PloS one 2018, 13(3):e0193894.
21.Novak KF, Takei HH: Determination of prognosis. In: Carranza’s clinical periodontology. 11 edn. 3251 Riverport lane, St. Louis, Missouri 63043: Elsevier, Sauunders; 2014: 373–383.
22.Bragger U: Radiographic parameters: biological significance and clinical use. Periodontology 2000 2005, 39:73–90.
23.Kallestal C, Matsson L: Criteria for assessment of interproximal bone loss on bite-wing radiographs in adolescents. Journal of clinical periodontology 1989, 16(5):300–304.
24.Hausmann E, Allen K, Clerehugh V: What alveolar crest level on a bite-wing radiograph represents bone loss? Journal of periodontology 1991, 62(9):570–572.
25.Jenkins WM, Papapanou PN: Epidemiology of periodontal disease in children and adolescents. Periodontology 2000 2001, 26:16–32.
26.Gargiulo AW, Wentz FM, Orban B: Dimension and relation of dentogingival junction in humans. J Periodontol 1961, 32(3):261–267.
27.Yamamoto T, Kinoshita Y, Tsuneishi M, Takizawa H, Umemura O, Watanabe T: Estimation of the remaining periodontal ligament from attachment-level measurements. Journal of clinical periodontology 2006, 33(3):221–225.
28.Tada S, Allen PF, Ikebe K, Zheng H, Shintani A, Maeda Y: The Impact of the Crown-Root Ratio on Survival of Abutment Teeth for Dentures. Journal of dental research 2015, 94(9 Suppl):220s–225s.