Related Experiment Video
Updated: Aug 23, 2026

Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology
Published on: August 22, 2022
Prevalence of fused and geminated teeth in Jordanian adults
Abed Al-Hadi Hamasha1, Taiseer Al-Khateeb
1Department of Preventive Dentistry, Faculty of Dentistry, Jordan University of Science and Technology, Irbid, Jordan. hamasha@just.edu.jo
Objectives:
The purpose of this study was to address the prevalence of dental fusion and gemination in a sample of Jordanian dental patients. Frequency distributions of these conditions among different types of teeth are also presented.
Method And Materials:
The data were collected from examination of radiographs from a random sample of periapical films. In all, 9,373 teeth from 1,660 dental records at the Faculty of Dentistry, Irbid, Jordan, were evaluated. A tooth was recorded having gemination if its crown was enlarged with a normal root and the tooth count was normal. A tooth was recorded fused if the tooth crown and root were enlarged and the tooth count revealed a missing tooth.
Results:
Fusion and gemination were detected in 18 and 21 teeth, respectively, with prevalence of 0.19% and 0.22%, respectively. Therefore, double teeth were found in 39 teeth with a prevalence of 0.42%. Maxillary central incisors Were the most commonly affected (3.6%), followed by mandibular third molars (0.9%).
Conclusion:
Fusion and gemination are uncommon conditions, but they are important dental anomalies that could affect any tooth in the mouth. Recognizing the condition will facilitate the endodontic, prosthodontic, periodontic, orthodontic, and surgical clinical management of such teeth.
Related Concept Videos
Teeth
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin and...
Prevalence and Incidence
Prevalence indicates the proportion of individuals in a population who have a specific disease or health condition at a...
Assessment of the Mouth
Mouth Inspection
The inspection begins with visually examining the mouth for symmetry, color, and size.
Tooth Anatomy
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or grinding food.