9-Üst 1. premolar · 2020-03-12 · incisal occlusal centra\ incisor latera\ incisor canine first...
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Distal M
esial Palatal
Occlusal
Buccal
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Amaçlar
•Prem
olarların işlevlerini tanımlam
ak •
Maksiller prem
olarların mandibular
premolarlardan ayırt edilm
esini sağlamak
•Tüm
dişler içerisinde premolarları seçm
ek ve ayırm
ak
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Total diş boyu 22.5 m
m.
Kron boyu
8.5 mm
. Kök boyu
14 m
m.
Kron genişliği 7 m
m.- kolede 5 m
m.
Kron kalınlığı
9 mm
.- kolede 8 mm
.
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Premolarların İşlevleri
•Besinin çiğnenm
esi ve öğütülmesi
•Yüzün dikey boyutunun korunm
ası •
Ağız ve yanaklara destek olunması
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Anterior Dişlerden Farkları
•Term
inoloji bakımından ; Ö
n dişler ile karşılaştırıldığında, arka dişlerin fasiyal yüzeylerine bakıldığından labiyal yerine “BU
KKAL” terimi kullanılır. Ayrıca insizal
kenarlar yerine “OKLÜ
ZAL” yüzeyler vardır. O
klüzal yüzeylerin kuspları, sırtları ve olukları vardır.
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•Prem
olar kronları, anterior dişlerin kronlarından daha kısadır. M
aksiller prem
olarların kökleri maksiller kesiciler ile
hemen hem
en aşağı yukarı aynı uzunluktadır.
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Kuron
•Bukkal görünüm
den kron, kontak noktalarından servikale doğru daralır. Kabaca kanin diş ile benzerlik gösterir. Beşgen gibi şekillenir.
•Kusp eğim
leri kanin dişteki gibi distal eğim
daha uzun olacak biçimde şekillenm
iştir.
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•Bukkalde en fazla kurvatür servikal bölgede görülür.
•Belirgin bir bukkal sırt m
evcuttur. •
Bukkal sırtın sağında ve solunda gelişim
sel çöküntüler m
evcuttur.
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•M
eziyal ve Distal Yüzeyler Konveks
•Bukkal Kasp, palatinal kasptan yaklaşık 1 m
m
daha kısa •
Servikal çizgi kök yönünde konvex
M
D
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Meziyal
görünüm
Distal görünüm
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Mesiyal
görünüm
Distal görünüm
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Mesiyal
görünüm
Distal görünüm
M
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