Abstract
Background Blood type is among the most important genetical characteristics of any individual and is shown to be correlated with the development of a variety of illnesses including dental diseases. Finding the association of ABO and Rh blood groups and impacted tooth is important in order to predict which population is more vulnerable to grow impacted third molars that could lead to making better intervention. The present investigation tried to take a small step in that regard, by evaluating the correlation between ABO and Rh blood groups and the most commonly impacted tooth, bony impacted third molars among Iranian individuals. Methods The investigation was done retrospectively on patients who were referred to the Department of Oral Radiology, Shiraz University of Medical Science, Shiraz, Iran. The patients were classified according to their blood groups, and 40 patients were randomly selected for each blood type. Therefore, the impaction of their third molars was evaluated, and statistical analyses were done in order to find any association. Results A total of 320 participants contributed to the study; 136 (42%) were males and 184 (57%) were females. The mean age was 29 ± 6 years. Among all participants, 205 (64%) had no impacted third molar, 26 (8%) had one impacted third molar, 43 (13%) had 2 impacted third molars, 5 (1%) had 3 impacted third molars, and 41 (12%) had 4 impacted molars. Conclusion According to the results of the present study, nearly one out of three individuals has at least an impacted third molar in the Iranian population, being more prevalent in individuals between 20 and 30 years old. The evaluation of the relationship between the blood group and impacted third molar revealed that blood groups have no association with the impacted third molars. However, more studies with higher and diversified participants should be done to find comprehensive results.
Highlights
Blood type is among the most important genetical characteristics of any individual and is shown to be correlated with the development of a variety of illnesses including dental diseases
All patients who came to obtain panoramic and cone-beam computed tomography (CBCT) imaging for examination or dental procedure were considered as the study population. en, 40 subjects for each blood group type and a total of 320 subjects were randomly selected to be enrolled in this study. ese numbers were suggested by an expert statistician to reduce the bias related to the frequency of blood group types in different populations
Inclusion criteria were individuals with an age between 20 and 80 years old, having high-quality panoramic radiograph or CBCT images and who wanted to participate in the study voluntarily. e exclusion criteria were a diagnosis of any systemic diseases such as cancer, autoimmune diseases such as systemic lupus erythematosus, blood diseases such as thalassemia, congenital syndromes such as Down syndrome, craniofacial deformities such as facial cleft, jaw pathology lesions, primary teeth dentition, and/or previous craniofacial trauma
Summary
Impaction occurs when one tooth or more teeth cannot completely erupt to the normal position in the oral cavity [1,2,3,4,5]. e prevalence of this condition is deemed to be higher in the maxilla and in women [6, 7]. Considering the dental diseases, previous investigations mentioned that there might be associations between the blood types and periodontal diseases and dental caries [23] In this regard, the evidence showed that the individuals with blood group A are at lower risk of developing dental caries; besides, children with the AB blood group are more vulnerable to develop early childhood caries [23, 26]. The evidence showed that the individuals with blood group A are at lower risk of developing dental caries; besides, children with the AB blood group are more vulnerable to develop early childhood caries [23, 26] By all means, these pieces of evidence that show ABO blood groups could play a diagnostic role and a prognostic factor for oral and dental diseases are still controversial and inconsistent. Finding the association of ABO and Rh blood groups and impacted tooth is important to predict which population is more vulnerable to grow impacted third molars, which could lead to making better intervention. e present investigation tried to take a small step in that regard, by evaluating the correlation between ABO and Rh blood groups and the most commonly impacted tooth, bonyimpacted third molars among Iranian individuals
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