Table of Contents
Introduction:
You might have heard of osteoma tumors affecting other body parts like the tibia and fibula, long bones, or even the ears, occurring in the external auditory meatus– but seldom are the facts known about jaw osteomas that are unique and rare in their occurrence, but possible as per several documented case reports in oral pathology literature. Let us explore jaw-based osteomas in detail and how early diagnosis of these slow-growing jaw tumors can promote the patient's oral quality of life.
What Are Osteomas?
Osteomas that are painless, slow-growing tumors in the jaw are often not recognized even on routine dental checkups and are extremely, in fact, asymptomatic. These lesions can only be discovered on a routine x-ray examination by your dental or maxillofacial surgeon, like on an orthopantomogram (OPG or panoramic dental x-ray) or cone beam computed tomography (CBCT) x-ray imaging. Rarely, therefore, even asymptomatic patients suffering from osteomas may mistake the clinical features or symptoms of osteomas for dental conditions, temporomandibular joint (joint connecting lower jaw bone to skull) discomfort, earaches, or headache syndromes. An x-ray examination of the complete dentition can often reveal a suppressed and slow-growing jaw osteoma tumor, that would lead patients to frequently experience symptoms of dental pain, jaw discomfort, radiating headaches, dysfunction concerning the dental posterior bite (occlusal dysfunction), limited mouth opening or trismus, limitation in the lower jaw movements, rarely even nerve compression and paresthesia, or loss of sensation in the affected areas of the jaw.
Osteomas are usually benign in the upper and lower jaws, slow-growing in nature, and can affect men twice as much as women, with an incidence greater in the age group of young adolescents or young adults in the second and third decade of life. If adolescents complain during a routine dental examination and may be asymptomatic of other features except for sudden localized growths of the jaw, the dentist or the surgeon should investigate the radiologic or radiographic aspect of the jaw and the dentition, to rule out any possible jaw tumors or osteomas in adolescents. These are described in oral pathology literature as slow-growing bone tumors that are painless but eventually can displace the upper or lower teeth from the jaw socket, as they expand in the cortical bone. Either because of the proliferation of the cancellous or the cortical jaw bone, this osteogenic neoplasm (tumor originating from bone cells) or jaw tumor can have several different clinical variants.
What Are the Types of Osteomas?
Osteomas in general can be classified into these variants. However, of these types, central osteomas are extremely rare in the jaw region.
A. Peripheral Type: These types of jaw osteomas are the ones found in the outer layer of the jaw bone or the periosteum (vascular connective tissue enveloping bone) region. These are benign tumors that are characterized typically by their slow-growing, chronic nature in young adolescents and can be further classified as sessile-shaped (broad-based) or pedunculated (structure that has stem), hard tumor masses that are attached to the cortical bone (outer surface of bone) of the jaw affected in the patient.
B. Extra Skeletal Type: These are the soft tissue tumors of the jaw that develop in the muscular tissues. These are quite frequently reported tumors or osteomas in medical literature but are seldom found in the jaw. Instead, they are found on long bones like the femur or the radius bone. In oral extra-skeletal osteomas, these lesions can occur on the frontal (forms forehead and upper part of eye socket), ethmoidal (located between nose cavity), and maxillary (upper jaw) or mandibular (lower jaw) bones. Case reports of extra skeletal osteomas even on the outer surface of the lower jaw or the mandible and on the condylar region have been reported in oral pathology literature.
C. Central Osteomas: These types of tumors are seldom reported in the jaw bone. They are extremely rare and occur in locations such as the connective tissue layers or the medullary cavities in the long bones.
How Are Jaw Osteomas Diagnosed?
Jaw osteomas, though rare, can be discovered in a radiographic examination, and they usually manifest as round, well-circumscribed radiopaque lesions that either possess a wide base or they would be having a pedicle. These benign tumors can also appear oval to an extent and would be attached mainly to the cortical jaw bone, as per radiographic case reports. It is important for the maxillofacial surgeon or the dentist to thoroughly evaluate the size and nature of osteomas because, as these are asymptomatic, slow-growing tumors, their invasiveness would be into the local dental or underlying alveolar bone (the bone that supports teeth) tissues easily.
Further, it is important to preoperatively assess the extent of these lesions to determine their anatomy, their relationship with the adjacent jaw nerves or the vital structures in the jaw, or their spread to the facial muscles or sinus region. The best radiographic modality for detecting osteomas of the jaw is usually through CT (computed tomography) scanning. CBCT sectional analysis can further give insight for the maxillofacial surgeon to determine the relationship or the invasive potential of the osteoma concerning the dentition and the jaw bone as well as with the paranasal sinus (air-filled spaces around the nasal cavity) regions. Advanced imaging modalities like multi-detector CT scanning can also be possibly beneficial in analyzing the anatomy and invasiveness of jaw tumors.
What Causes Jaw Osteomas?
The etiology of osteomas, though not exactly elicited in medical literature, would be mostly because of congenital origin, owing to discrepancies in embryogenesis (a process of embryo formation). Further, they can also be a result of reactive or neoplastic systemic lesions in the body that would be undetected or untreated in the affected patients.
What Other Conditions Resemble Jaw Osteomas?
Differential diagnosis holds great value in the timely management of osteoma tumors of the jaw. These lesions can clinically resemble jaw osteomas hence the need for radiographic evaluation to differentially diagnose the tumors from them.
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Exostosis or Tori: These are bilaterally symmetric lesions that have a histologic resemblance to osteomas of the jaw.
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Osteochondroma: Lesions found on the condylar or coronoid portions of the lower jaw or mandible.
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Osteoblastoma: Painful growing neoplasms of the jaw.
How Are Jaw Osteomas Managed?
Management of jaw osteomas is usually by surgical resection (removal) of the tumors completely, and reconstructive surgery or bone grafts of the jaw can be considered to fill the defects and restore jaw aesthetics and function.
Conclusion
To conclude therefore, clinical and radiographic examination and cross-verification with the establishment of a clear diagnosis from the lesions that resemble jaw osteomas can help dental surgeons detect the slow-growing painless tumors that would affect adolescents or young adults. Timely and proper diagnosis by oral surgeons can hence play an important part in restoring jaw functions and esthetics.
