1. Fuster-Torres MA , Gargallo-Albiol J, Berini-Aytés L, Gay-Escoda C. Evaluation of the indication for surgical extraction of third molars according to the oral surgeon and the primary care dentist. Experience in the Master of Oral Surgery and Implantology at Barcelona University Dental School. Med Oral Patol Oral Cir Bucal. 2008;13:E499-504.

PMid:18667984

2. Alfadil L, Almaied E. Prevalence of impacted third molars and the reason for extraction in Saudi Arabia. Saudi Dent J. 2020;32:262-8.

https://doi.org/10.1016/j.sdentj.2020.01.002

PMid:32647474 PMCid:PMC7336025

3. Khojastepour L , Khaghaninejad M, Hasanshahi R, Forghani M, Ahrari F. Does the Winter or Pell and Gregory classification system indicate the apical position of impacted mandibular third molars? J Oral Maxillofac Surg. 2019;77:2222.e1-2222.e9.

https://doi.org/10.1016/j.joms.2019.06.004

PMid:31306615 

4. Bali A, Bali D, Sharma A, Verma G. Is Pederson index a true predictive difficulty index for impacted mandibular third molar surgery? A meta-analysis. J Maxillofac Oral Surg. 2013;12:359-64.

https://doi.org/10.1007/s12663-012-0435-x

PMid:24431870 PMCid:PMC3777040

5. Akadiri O, Obiechina AE. Assessment of difficulty in third molar surgery- a systematic review. J Oral Maxillofac Surg. 2009;67:771-4.

https://doi.org/10.1016/j.joms.2008.08.010

PMid:19304033 

6. Al-Samman AA. Evaluation of Kharma scale as a predictor of lower third molar extraction difficulty. Med Oral Patol Oral Cir Bucal. 2017;22:e796-e99.

https://doi.org/10.4317/medoral.22082

PMid:29053661 PMCid:PMC5814000

7. Roy I, Baliga S, Louis A, Rao S. Importance of clinical and radiological parameters in assessment of surgical difficulty in removal of impacted mandibular 3rd molars: a new index. J Maxillofac Oral Surg. 2015;14:745-9.

https://doi.org/10.1007/s12663-014-0731-8

PMid:26225071 PMCid:PMC4511907

8. Sammartino G, Gasparro R, Marenzi G, Trosino O, Mariniello M, Riccitiello F. Extraction of mandibular third molars: proposal of a new scale of difficulty. Br J Oral Maxillofac Surg. 2017;55:952-7.

https://doi.org/10.1016/j.bjoms.2017.09.012

PMid:29054564 

9. de Carvalho RWF, Vasconcelos BC. Pernambuco index: predictability of the complexity of surgery for impacted lower third molars. Int J Oral Maxillofac Surg. 2018;47:234-40.

https://doi.org/10.1016/j.ijom.2017.07.013

PMid:28818641 

10. Santamaria J, Arteagoitia I. Radiologic variables of clinical significance in the extraction of impacted mandibular third molars. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 1997;84:469-73.

https://doi.org/10.1016/S1079-2104(97)90259-6

PMid:9394375 

11. Yuasa H, Kawai T, Sugiura M. Classification of surgical difficulty in extracting impacted third molars. Br J Oral Maxillofac Surg. 2002;40:26-31.

https://doi.org/10.1054/bjom.2001.0684

PMid:11883966 

12. Susarla SM, Dodson TB. Estimating third molar extraction difficulty: a comparison of subjective and objective factors. J Oral Maxillofac Surg. 2005;63:427-34.

https://doi.org/10.1016/j.joms.2004.12.003

PMid:15789312 

13. Jaroń A, Trybek G. The pattern of mandibular third molar impaction and assessment of surgery difficulty: A retrospective study of radiographs in East Baltic population. Int J Environ Res Public Health. 2021;18:6016.

https://doi.org/10.3390/ijerph18116016

PMid:34205078 PMCid:PMC8199855

14. Diniz Freitas M, Lago-Mendez L, Gude-Sampedro F, Somoza-Martin JM, Gándara-Rey JM, García-García A. Pederson scale fails to predict how difficult it will be to extract lower third molar. Br J Oral Maxillofac Surg. 2007;45:23-6.

https://doi.org/10.1016/j.bjoms.2005.12.004

PMid:16434132 

15. García AG, Sampedro FG, Rey JG, Vila PG, Martin MS. Pell-Gregory classification is unreliable as a predictor of difficulty in extracting impacted lower third molars. Br J Oral Maxillofac Surg. 2000;38:585-7.

https://doi.org/10.1054/bjom.2000.0535

PMid:11092770 

16. Park KL. Which factors are associated with difficult surgical extraction of impacted lower third molars? J Korean Assoc Oral Maxillofac Surg. 2016;42: 251-8.

https://doi.org/10.5125/jkaoms.2016.42.5.251

PMid:27847732 PMCid:PMC5104866

17. Gay-Escoda C, Sánchez-Torres A, Borrás-Ferreres J, Valmaseda-Castellón E. Third molar surgical difficulty scales: systematic review and preoperative assessment form. Med Oral Patol Oral Cir Bucal. 2022;27:e68-76.

https://doi.org/10.4317/medoral.24951

PMid:34874928 PMCid:PMC8719785

18. Barreiro-Torres J, Diniz-Freitas M, Lago-Méndez L, Gude-Sampedro F, Gándara-Rey JM, García-García A. Evaluation of the surgical difficulty in lower third molar extraction. Med Oral Patol Oral Cir Bucal. 2010;15:e869-74.

https://doi.org/10.4317/medoral.15.e869

PMid:20526272 

19. Komerik N, Muglali M, Tas B, Selcuk U. Difficulty of impacted mandibular third molar tooth removal: predictive ability of senior surgeons and resident. J Oral Maxillofac Surg. 2014;72:e1-6.

https://doi.org/10.1016/j.joms.2014.01.023

PMid:24656427 

20. Sánchez Jorge MI, Ocaña RA, Valle Rodríguez C, Peyró Fernández-Montes B, Rico-Romano C, Bazal-Bonelli S, et al. Mandibular third molar extraction: perceived surgical difficulty in relation to professional training. BMC Oral Health. 2023;23:485.

https://doi.org/10.1186/s12903-023-03131-7

PMid:37452399 PMCid:PMC10349451

21. Cuschieri S. The STROBE guidelines. Saudi J Anaesth. 2019;13:S31-34.

https://doi.org/10.4103/sja.SJA_543_18

PMid:30930717 PMCid:PMC6398292

22. Susarla SM, Dodson TB. How well do clinicians estimate third molar extraction difficulty? J Oral Maxillofac Surg. 2005;63:191-9.

https://doi.org/10.1016/j.joms.2004.05.220

PMid:15690287 

23. Ferrús-Torres E, Gargallo-Albiol J, Berini-Aytés L, Gay-Escoda C. Diagnostic predictability of digital versus conventional panoramic radiographs in the presurgical evaluation of impacted mandibular third molars. Int J Oral Maxillofac Surg. 2009;38:1184-7.

https://doi.org/10.1016/j.ijom.2009.06.023

PMid:19660912 

24. Pippi R. Evaluation capability of surgical difficulty in the extraction of impacted mandibular third molars: a retrospective study from a post-graduate institution. Ann Stomatol (Roma). 2014;31:7-14.

https://doi.org/10.11138/ads/2014.5.1.007

PMid:24753796

25. Macluskey M, Slevin M, Curran M, Nesbitt R. Indications for and anticipated difficulty of third molar surgery: a comparison between a dental hospital and a specialist high street practice. Br Dent J. 2005;199:671-5.

https://doi.org/10.1038/sj.bdj.4812931

PMid:16311571 

26. Renton T, Smeeton N, McGurk M. Factors predictive of difficulty of mandibular third molar surgery. Br Dent J. 2001;190:607-10.

https://doi.org/10.1038/sj.bdj.4801052a

PMid:11441899 

27. Sánchez-Torres A, Soler-Capdevila J, Ustrell-Barral M, Gay-Escoda C. Patient, radiological, and operative factors associated with surgical difficulty in the extraction of third molars: a systematic review. Int J Oral Maxillofac Surg. 2020;49:655-65.

https://doi.org/10.1016/j.ijom.2019.10.009

PMid:31735527 

28. Alvira-González J, Figueiredo R, Valmaseda-Castellón E, Quesada-Gómez C, Gay-Escoda C. Predictive factors of difficulty in lower third molar extraction: A prospective cohort study. Med Oral Patol Oral Cir Bucal. 2017;22:e108-e14.

https://doi.org/10.4317/medoral.21348

PMid:27918736 PMCid:PMC5217488

29. Gbotolorum OM, Arotiba GT, Ladeinde AL. Assessment of factors associated with surgical difficulty in impacted mandibular third molar extraction. J Oral Maxillofac Surg. 2007;65:1977-83.

https://doi.org/10.1016/j.joms.2006.11.030

PMid:17884525 

30. Susarla SM, Dodson TB. Risk factors for third molars extraction difficulty. J Oral Maxillofac Surg. 2004;62:1363-71.

https://doi.org/10.1016/j.joms.2004.05.214

PMid:15510357