Sys Rev Pharm 2020;11(11):19-23 A multifaceted review journal in the field of pharmacy 19 Systematic Reviews in Pharmacy Vol 11, Issue 11, Nov-Dec 2020 Lower Third Molar Impaction Based on Pell and Gregory Classification: A Panoramic Study Barunawaty Yunus, Dwi Putri Wulansari*, Bau Mila Tunnizha Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Hasanuddin University, Makassar, Indonesia Corresponding author: dwiputri@unhas.ac.id ABSTRACT Tooth impaction is a term where the tooth is obstructed. Hence it is unable to fully erupt to its normal position. The objective of this study was to determine the prevalence of impacted mandibular third molars by gender and age, according to Pell and Gregory classification using panoramic radiography. This research was conducted using Panoramic radiograph data for impacted lower third molars was selected and was classified according to Pell and Gregory’s classification method. The resulting study Based on gender, the incidence of impacted lower third molars are dominated by females. Based on age, lower third molar impaction occurred mostly in people aged 21-30 years old. The relationship between gender and third molar impaction on the left mandible has a p-value of > 0.05. The relationship between gender and third molar impaction on the right mandible has a p-value of > 0.05. The relationship between age and third molar impaction on the left mandible has a p-value of > 0.05. The relationship between age and third molar impaction on the right mandible had a p-value of <0.05. Based on the study conducted, it can be concluded that the prevalence of lower third molar impaction based on gender is mostly seen in females with the age range from 21-30 years old, with class IA being the most common classification. Keywords: Impaction; Third Molar; Mandible; Pell and Gregory Method. Correspondence: Dwi Putri Wulansari Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Hasanuddin University, Makassar, Indonesia Corresponding author: dwiputri@unhas.ac.id INTRODUCTION Teeth development and growth often face disruption in eruption and can happen in both anterior and posterior teeth. Teeth with incorrect teeth bud position will cause eruption anomalies, whether the teeth erupted outside of the correct arch or the teeth were impacted. Tooth impaction is a condition where a tooth is obstructed; hence it is unable to fully erupt to its normal position. 1 Tooth impaction occurs due to the shrinking of the human jaw owing to the evolutionary process caused by changes in human behavior and eating patterns or can be caused by hereditary factors. Impacted teeth can also be caused by pathological changes in teeth, cysts, tissue hyperplasia or local infection. 2 Several methods to classify impacted teeth have been established, namely classification based on the level of impaction, third molar angulation, and its relation to the anterior border of mandible ramus. Winter’s also Pell and Gregory’s classifications are the most common method used to classify lower third molar impaction. 3,4 In general, teeth impactions are examined with a panoramic radiograph. Panoramic radiography is an extraoral radiographic technique that is useful for obtaining a complete picture of the maxillofacial or seeing the wide scope of the jaw, so in addition to seeing the condition of impacted teeth panoramic radiography is also indicated for trauma evaluation, extensive tooth or bone disease, detection of large lesions, evaluation of tooth loss, evaluation of tooth development and eruption status, evaluation of maxillary sinus and temporomandibular joint abnormalities and developmental abnormalities such as prognathy and retrognathy. 5 Based on these data, the authors are interested in conducting research related to the prevalence of the impacted mandibular third molar teeth according to Pell and Gregory classification method titled with the aim to investigate the prevalence of lower third molar impaction based on Pell and Gregory’s classification viewed from panoramic radiograph obtained from Hasanuddin University Dental Hospital. MATERIALS AND METHODS Type of study was descriptive observational with Cross-Sectional Study design. This research was conducted at the Hasanuddin University Dental Hospital, Makassar city, particularly in the dental radiology installation during August 2019. The study subjects included were panoramic radiograph archived in the dental hospital collected from June 2018 until June 2019. The sampling technique used in this study was the non-random sampling method technique (non-probability sampling methods) in the form of purposive sampling. This sampling method is a sampling technique. Panoramic radiograph collected in the dental hospital from June 2018-2019 with tumor/pathologic lesions that disturbs the appearance of mandibular third molar were excluded from this study. After data processing was conducted, analysis of the data was then conducted using a statistics program. RESULTS This research was conducted using panoramic radiograph data in cases of impacted lower third molar teeth in the Department of Oral and Maxillofacial Radiology of Hasanuddin University Dental Hospital in June 2018 - June 2019 with the amount of data obtained as many as 76 panoramic radiographs. Based on this study, impacted lower third molar impacted frequencies by gender and age using univariate analysis, and the relationship between the