Gömülü veya süpernümerer diş BT bulguları

Özet

Gömülü diş, sürme yolunda kalmış normal diş; süpernümerer diş ise olağan diş dizisine ek oluşmuş diş yapısıdır ve ikisi de çene BT'sinde insidental bulunabilir. İnce kesit BT, mine-dentin yoğunluğunu, dişin yönünü, sürme yoluna göre konumunu ve komşu köklerle ilişkisini gösterir. Özellikle mesiodens veya gömülü kanin çevresinde komşu dişlerde yer değiştirme, kök rezorpsiyonu ya da perikoronal kistik lezyon eşlik edebilir. Bu ilişkiler değerlendirilmezse küçük bir diş varyantına eşlik eden dental hasar veya dentigeröz kist gözden kaçabilir.

Faz ve pencere

Kontrastsız tanısal: Kontrast gerekmez; kemik algoritmasında mine ve dentinden oluşan diş biçimli yoğun yapı, alveoler ark içindeki sürmemiş konumu ve çevresindeki foliküler aralık incelenir.
Kemik algoritması tanısal: İnce aksiyel kesit ile koronal/sagittal dental MPR, dişin kron-kök yönelimini, komşu kök temasını, rezorpsiyonu ve kortikal sınır değişikliğini gösterir.

Önerilen pencereler: Kemik (G 1800 / M 400), Yumuşak doku (G 400 / M 40).

BT bulguları

Gömülü diş, BT’de anatomik diş biçimiyle tanınabilir; ancak verilen kaynaklar mine ile dentin arasındaki yoğunluk farkını desteklemiyor.
Sürmemiş diş alveoler ark içinde beklenen sürme yolunda kalabilir veya ark dışında ektopik konumda bulunabilir.
Süpernümerer diş, mevcut diş dizisine eklenen ayrı kron-kök yapısıdır; anterior maksilla orta hatta yerleşen örnek mesiodens olarak adlandırılır.
Dişin uzun ekseni, kronun komşu köklere veya burun tabanı/maksiller sinüs gibi yakın yapılara yönelimini gösterir.
Komşu diş köklerinde itilme, angülasyon veya kortikal kök yüzeyinde rezorpsiyon bulunup bulunmadığı çok düzlemli kesitlerde incelenir.
Kronu çevreleyen düşük dansiteli perikoronal alan ve genişleme, dentigeröz kist ya da başka odontojenik lezyon eşlik olasılığını gündeme getirir.

Normalde

Normal diş arkında her diş, alveoler soketinde beklenen sırada ve sürme yönünde yer alır; kök konturları komşu dişlerden ayrıdır ve perikoronal boşluk ince, düzenlidir. Aynı seviyede iki taraflı diş dizisini, gömülü yapının kron-kök şeklini ve komşu köklerin bütünlüğünü karşılaştır; ektopik diş veya çevresindeki belirgin genişleme bu normal düzeni bozar.

Normal BT ile kıyasla

Aynı bölgenin, kaynak veri setinde patoloji içermediği belirtilen bir BT incelemesini kesit kesit kaydırın; organ sınırlarını açarak anatomiyi hasta görüntüsüyle karşılaştırın. Küçük rastlantısal bulgular tümüyle dışlanmamıştır.

Kaynak: TotalSegmentator v2.01 veri seti (Wasserthal ve ark., Radiology: Artificial Intelligence 2023), CC BY 4.0, vaka s0849; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.

Ayırıcı tanı

Odontom: mine-dentin benzeri çok sayıda küçük dişçik veya düzensiz kalsifiye kitle oluşturur, tek bir normal kron-kök anatomisi göstermeyebilir.
Dentigeröz kist: gömülü diş kronunu çevreleyen iyi sınırlı radyolüsent lezyon şeklinde genişler ve kemiği yeniden şekillendirebilir.
İdiyopatik osteoskleroz: yoğun kemik odağıdır, diş kronu, mine-dentin ayrımı ve kök kanalı bulunmaz.
Odontojenik keratokist: çene içinde litik lezyon olarak ilerler; diş benzeri yüksek yoğunluklu kron-kök biçimi içermez.
Diş kökü veya kron artığı: çekim alanında kalmış diş parçaları görüntülemede görülebilir; verilen kaynaklar bunları gömülü dişten ayırmak için anatomik biçim, önceki çekim öyküsü veya diş arkındaki beklenen yer ölçütlerini desteklemiyor.

Tuzaklar

Diş dolgusu ve metal restorasyon kaynaklı çizgilenme mine-dentin sınırını örtebilir; dişin kron-kök devamlılığını artefaktsız ardışık kesitlerde izle.
Diş folikülü normalde de kron çevresinde ince radyolüsent çizgi oluşturur; dentigeröz kist demeden önce çevresel genişleme ve kemikte ekspansiyon olup olmadığını ara.
Maksiller anterior bölgede mesiodens, nazal taban veya kesici diş köküyle üst üste düşebilir; sagittal ve koronal MPR konum ilişkisini açığa çıkarır.
Süpernümerer diş sayısı ve yönelimi raporda karışabilir; her diş benzeri yapıyı ayrı takip edip kron-kök bütünlüğü ile komşu dişleri belirt.

Kendini dene

Maksilla orta hatta yatay konumlu tek kron-kök yapısı kesici kökleri ayırıyor; çevresinde genişleme yok. Ön maksilla orta hattında, santral kesiciler arasında bulunan süpernümerer diş mesiodens olarak adlandırılır.
Cevabı göster
Mesiodens. Orta hatta bulunan ayrı, anatomik kron-kök biçimli süpernümerer diş mesiodens ile uyumludur. Odontom çoğunlukla dişçik veya düzensiz mineralize kitle; kist radyolüsent boşluk; osteoskleroz ise diş biçiminden yoksun kemik odağıdır.
Gömülü kaninin kronu çevresinde iyi sınırlı radyolüsent alan ve alveoler genişleme var. En olası eşlik eden lezyon nedir?
Cevabı göster
Dentigeröz kist. Gömülü diş kronunu saran ve kemiği genişleten radyolüsent perikoronal lezyon dentigeröz kist için tipiktir. Diğer seçenekler bu kron merkezli kistik görünümü açıklamaz.

İlgili konular

Mandibula veya maksilla osteomu

Kaynaklar

Bu sayfadaki 36 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 4 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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Eğitim amaçlıdır; hasta başında tanı ve tedavi kararının yerine geçmez. İçerik yapay zekâ destekli bir süreçle güncel literatüre göre cümle cümle kaynaklarla karşılaştırıldı, ancak uzman radyolog incelemesinden geçmedi. Klinik kararlarda güncel kılavuzları, kurum protokollerini ve radyoloji raporunu esas alın.