www.sbdmj.com - Stomatologija - Baltic Dental and Maxillofacial Journal

Stomatologija 2013; 15 (2): 47-53 322 KB

Prevalence of teeth number anomalies in orthodontic patients
Giedrė Trakinienė, Monika Ryliškytė, Aurelija Kiaušaitė

Summary

Objectives. The purpose of this study was to determine if the prevalence of teeth number anomalies (TNA) is more frequent in orthodontic patients than in common population and what is TNA clinical manifestation.

Material and methods. The records of 824 orthodontic patients (average age 15.22 years) from Orthodontic Clinic of Lithuanian University of Health Sciences were analyzed. The radiographs were analyzed by trained observer who followed a pre-established protocol: general observation of the teeth including third molar, followed by a systematic analysis of the erupted and unerupted teeth number in each quadrant. Descriptive statistics were performed for the study variables. A chi-square test was used to determine the difference in the prevalence of hypodontia between the genders. A value of P<0.05 was considered significant.

Results. The prevalence of hypodontia was 17.11 percent with no statistically significant difference between the genders (P>0.05). More frequently teeth were missing in the lower jaw: in the upper jaw – 10.3%, in the lower – 12.5% without statisticaly significant diference. Unilateral occurrence of dental agenesis was 1.5 times more common than bilateral occurrence. If more than one tooth was missing, usually other missing tooth was in the same group and in the same jaw. The upper and lower third molars were the most frequently missing teeth, followed by the mandibular second premolar. The prevalence of hyperdontia was 0.85 percent. Mesiodens was the most frequently found supernumerary tooth.

Conclusions. It was found, that 17.96% of orthodontic patients had teeth number anomalies. The upper and lower third molars were the most frequently missing teeth, followed by the mandibular second premolar. Hypodontia occurred more frequently than hyperdontia. Mesiodens was the most frequently found supernumerary tooth. The results confirm that TNA are more often found in orthodontic patients and these patients should be treated with multidisciplinary approach.

Key words: hypodontia, hyperdontia, congenitally missing teeth, third molars.

Received: 12 08 2012

Accepted for publishing: 20 06 2013

¹Clinic of Orthodontics, Lithuanian University of Health Sciences, Kaunas, Lithuania

²Västerbottens läns landsting FTV Lycksele, Sweden

Giedrė Trakinienė¹ – D.D.S., orthodontist

Monika Ryliškytė¹ – postgraduate student in orthodontics

Aurelija Kiaušaitė² – general dentist

Address correspondence to Giedre Trakinienė, Clinic of Orthodontics, Lithuanian University of Health Sciences, Lukšos-Daumanto 6, LT-50106, Kaunas, Lithuania. E-mail address: gyd_trakiniene@yahoo.com



	Baltic Dental and Maxillofacial Journal

June, 2013, Vol. 15, No. 2 CONTENTS SCIENTIFIC ARTICLES Caries and its risk factors in young children in five different countries Simona Skrīvele, Rūta Care, Sandra Bērziņa, Susanne Kneist, Vanessa de Moura-Sieber, Ronaldo de Moura, Annerose Borutta, Elena Maslak, Tamara Tserekhava, Natalia Shakovets, Maik Wagner 39-46 Prevalence of teeth number anomalies in orthodontic patients Giedrė Trakinienė, Monika Ryliškytė, Aurelija Kiaušaitė 47-53 CASE REPORTS Spring-bite: a new device for jaw motion rehabilitation. A case report Luca Guarda-Nardini, Gianmaria Concheri, Giuseppe Ferronato, Daniele Manfredini 54-57 Extra-nodal primary diffuse large B-cell lymphoma of the maxilla. Fine needle aspiration cytology Alexandra Kalogeraki, Dimitrios Tamiolakis, Ilias Ligoxygkakis, Vaios Sinatkas, Michael Papadakis, Efstathios N. Stathopoulos 58-60 Keratoacanthoma in the inferior lip of an immunosuppressed patient. A case report Cassiano Lima Chaiben, Joslei Carlos Bohn, Adriano Kuczynski, Francisca Berenice Dias Gil, Antonio Adilson Soares de Lima 61-64 © 2013 Stomatologija		Stomatologija 2013; 15 (2): 47-53 322 KB Prevalence of teeth number anomalies in orthodontic patients Giedrė Trakinienė, Monika Ryliškytė, Aurelija Kiaušaitė Summary Objectives. The purpose of this study was to determine if the prevalence of teeth number anomalies (TNA) is more frequent in orthodontic patients than in common population and what is TNA clinical manifestation. Material and methods. The records of 824 orthodontic patients (average age 15.22 years) from Orthodontic Clinic of Lithuanian University of Health Sciences were analyzed. The radiographs were analyzed by trained observer who followed a pre-established protocol: general observation of the teeth including third molar, followed by a systematic analysis of the erupted and unerupted teeth number in each quadrant. Descriptive statistics were performed for the study variables. A chi-square test was used to determine the difference in the prevalence of hypodontia between the genders. A value of P<0.05 was considered significant. Results. The prevalence of hypodontia was 17.11 percent with no statistically significant difference between the genders (P>0.05). More frequently teeth were missing in the lower jaw: in the upper jaw – 10.3%, in the lower – 12.5% without statisticaly significant diference. Unilateral occurrence of dental agenesis was 1.5 times more common than bilateral occurrence. If more than one tooth was missing, usually other missing tooth was in the same group and in the same jaw. The upper and lower third molars were the most frequently missing teeth, followed by the mandibular second premolar. The prevalence of hyperdontia was 0.85 percent. Mesiodens was the most frequently found supernumerary tooth. Conclusions. It was found, that 17.96% of orthodontic patients had teeth number anomalies. The upper and lower third molars were the most frequently missing teeth, followed by the mandibular second premolar. Hypodontia occurred more frequently than hyperdontia. Mesiodens was the most frequently found supernumerary tooth. The results confirm that TNA are more often found in orthodontic patients and these patients should be treated with multidisciplinary approach. Key words: hypodontia, hyperdontia, congenitally missing teeth, third molars. Received: 12 08 2012 Accepted for publishing: 20 06 2013 ¹Clinic of Orthodontics, Lithuanian University of Health Sciences, Kaunas, Lithuania ²Västerbottens läns landsting FTV Lycksele, Sweden Giedrė Trakinienė¹ – D.D.S., orthodontist Monika Ryliškytė¹ – postgraduate student in orthodontics Aurelija Kiaušaitė² – general dentist Address correspondence to Giedre Trakinienė, Clinic of Orthodontics, Lithuanian University of Health Sciences, Lukšos-Daumanto 6, LT-50106, Kaunas, Lithuania. E-mail address: gyd_trakiniene@yahoo.com