Multiple Calcifying Hyperplastic Dental Follicle (MCHDF) is a rare condition characterised by multiple impacted permanent teeth, with enlarged dental follicles, containing calcifications in the inner portions of the dental follicles. The profile associated with this pathology presented a preference for young male patients, more often affecting the mandible, primarily molars and canines, and its aetiology is unknown.[2-4]
In MCHDF microscopy exams, is characterised by the presence of moderately dense fibrous connective tissue, containing numerous foci of calcification and remains of odontogenic epithelia. In radiographs of MCHDF cases, the crown of the unerupted teeth are normally surrounded by a tooth follicle that exceeds 3 mm in diameter with a radiopaque halo in the outer portions, similar to a cyst, and can present radiopaque foci in the inner portions of the dental follicles.[3,6]
When an impacted tooth with an increased follicle is viewed in the radiograph, the dentist should do a cone-beam computed tomography (CBCT), in an attempt to obtain greater details and characteristics of the lesions.[4,7] Since imaging tests are essential for this condition and taking into account how uncommon it is, this study sought to describe the imaging characteristics of three cases of MCHDF and compare how this condition can appear in different patients.
This 5-year-old male patient, with no systemic alterations, sought out a dentist for a paediatric evaluation. A panoramic radiograph was requested for follow-up on tooth eruption. The image revealed the presence of all of the patient’s teeth; however, the absence of radiopacity of the enamel of teeth 36 and 46 were observed. This aspect suggests that the patient presents a hypocalcified amelogenesis imperfecta or enamel hypoplasia. At this moment, no change in the tooth eruption was observed [Figure 1a].
The second image was performed at 12 years of age, it was possible to observe the impaction trend in most teeth. The increase in the pericoronal space and the presence of calcification areas were observed near the mandibular bicuspid crowns [Figure 1b]. The third radiograph was performed at 16 years of age, confirming the impactation of teeth 15, 18, 24, 28, 34, 35, 37, 38, 43, 44, 45, 47, and 48, with an increase in the pericoronal spaces, with radiopaque areas inside them, confirming the imaging diagnosis of MCHDF. Ankylosis in the deciduous teeth was also observed. It is important to highlight that this patient presented a malformation of the dental enamel in all of his teeth, characterised by the partially circumscribed radiopacity images in the crowns of his teeth, which is typical of Hypocalcified Amelogenesis Imperfecta [Figure 1c].
This 14-year-old female patient, with no systemic alterations, undergoing orthodontic treatment. The panoramic radiograph showed an impacted tooth 23, with an increase in the pericoronal space, as well as the tendency toward the impactation of teeth 37, 46, and 47 [Figure 2a]. For a better evaluation, a CBCT scan was requested. In the tomographic slices of the mandibular molar regions of both sides, it was found that the third molars were in formation, while the first and second molars were retained and impacted [Figure 2b-e], with an increase in the pericoronal space and areas of calcification around them; thus, the patient presented a tomographic diagnosis of MCHDF.
This 45-year-old female patient, with no systemic alterations and completely edentulous, sought the dentist to continue her prosthetic rehabilitation. A panoramic radiograph was requested to evaluate the intraoral bone condition of the patient. Multiple radiopaque regions were observed, with similar forms of impacted teeth in both the maxilla and the mandible, as well as of four implants in the maxilla [Figure 3a].
For the planning of the case, the patient underwent a CBCT scan. In the maxilla and the mandible, all of the teeth were impacted, with the respective dental follicles increased, with hyperdense areas inside them, also presenting root resorption and the partial absence of periodontal space, compatible with ankylosis [Figure 3b-e]. The increase in the pericoronal space with calcified areas around many of the impacted teeth reveals a typical tomographic diagnosis of MCHDF.
The predilection for lower molars in cases of MCHDF is a consensus in the literature. This prevalence is repeated in the three cases presented. In all cases, the mandible and molars were affected. However, in the first and third cases, this change was also observed in the maxilla and in other dental groups.
The patients diagnosed with MCHDF have a well-defined profile of being young and male.[3-5,8] Nevertheless, only one of the three patients reported in this study is male. This deviation standard also occurs when we analyse the age, since the third patient is above the fifth decade of life.
None of the patients reported alterations in family members, making it difficult to define the cause of this anomaly. The most commonly accepted hypotheses in the literature tend to attribute genetic and hormonal causes as the main etiological factors.
In radiographs, the MCHDF lesions are described by a hyperplastic dental follicle, with sclerotic edges, containing radiolucid foci in the inner portion, surrounding the unerupted tooth.[4,5,8] These characteristics are similar to that observed in the panoramic radiograph of the three cases [Figures 1-3].
The CBCT should be requested to bring more details to the analysis.[4,7] However, cases of MCHDF in the literature reporting this type of examination modality are scarce. Studies with CBCT reported impacted teeth associated with hypodense areas, rounded with well-defined edges, containing hyperdense foci, interpreted as calcifications.[3,4] The imaging pattern described in the literature was similar to that found in reported cases [Figures 2 and 3].
Teeth retained for long periods of time can be associated with other alterations. Two abnormalities in the position were observed in these cases: Mesioangulation and distoangulation. An ankylosis was observed in the first [Figure 1] and in the third [Figure 3] cases, which may be the result of the period of inclusion of these teeth. This finding even further damages the eruption of the tooth.
In the first case, we also observed the diagnosis Hypocalcified Amelogenesis Imperfecta [Figure 1]. It is noteworthy that this is the first case report about the alterations in the structure of tooth enamel with MCHDF in the literature. The presence of supranumeraries was found in the third case; this anomaly has already been associated with MCHDF. The presence of root resorption was also detected in the third case, although there is no correlation between this pathology and MCHDF, this alteration is a common inflammatory response in teeth retained over long periods. Table 1 enumerates important points found in each case.
Therefore, the imaging examinations are essential for the diagnosis and follow-up of MCHDF cases. In a CBCT scan it is possible to observe dental follicles in all dimensions and confirm their hyperplasia, in addition to performing slices in micrometres, generating an image of calcifications, which previously could only be observed in microscopic examinations. With a consistent imaging diagnosis, less invasive treatments become a viable option and should be more widely studied.
Declaration of patient consent
The authors certify that they have obtained all appropriate patient consent forms. In the form, the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.
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Conflicts of interest
There are no conflicts of interest.
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