I-incisor (isuselwa egameni elithi incision, elivela kwelesiLatini Ukusikwa, incise) uhlobo lwamazinyo, atholakala emlonyeni womlomo futhi asetshenziselwa ukusika ukudla.

Amazinyo omuntu anama-incisors ayisishiyagalombili asakazwa ngale ndlela elandelayo:

• Ama-incisors amabili aphezulu aphezulu
• Ama-incisors amabili aphezulu angemuva
• Ama-incisors amabili aphansi amaphakathi
• Ama-incisors amabili aphansi angemuva

Zakha imengamo yamazinyo ebekwe ngaphambi kwe-maxilla ne-mandible, ehambelana ngokulandelana emihlathini ephezulu nengezansi.

Ama-incisors anjalo amazinyo okuqala abonakalayo futhi ube neqhaza elibalulekile kubuhle bamazinyo. Yibo abahamba phambili ekuhlukumezekeni ngokomzimba kwasebuntwaneni.

Inkulumo ethi “amazinyo ajabule” isetshenziselwa ukuchaza ibanga phakathi kwama-incisors amabili aphezulu aphakathi. Leli banga empeleni libizwa ngokuthi “i-diastema”.

Ama-incisors aphakathi nendawo naphansi avame ukufana kakhulu.

Kutholakala emgodini womlomo kanye nase-engeli ye-arch yamazinyo, kukhona ama-canines angu-4, asakazwa ngale ndlela elandelayo:

• ama-canines amabili aphezulu, atholakala nhlangothi zombili zama-incisors aphezulu
• ama-canine amabili aphansi, atholakala nhlangothi zombili zama-incisors aphansi.

Ama-canine angamazinyo abukhali anemiphetho emibili ebukhali. Ngenxa yalokhu kanye nokuma kwawo okucijile, ama-canine asetshenziselwa ukuhlikihla ukudla okuqinile njengenyama. Izinyo elihlukile kwamanye amazinyo kusukela ekuqaleni komugqa wezilwane ezincelisayo.

Zonke izilwane ezidla inyama zine-fang canine ethuthuke kakhulu, kodwa idlozi elivamile kuyo yonke imindeni yamanje yezilwane ezidla inyama, ama-Miacis, isilwane esincelisayo sangaphambi komlando esineminyaka eyizigidi ezingu-60 ubudala, sasinamazinyo angu-44 kanye nezinja ezingakakhiwa kahle.

Lawa mazinyo ngezinye izikhathi abizwa ngokuthi “amazinyo eso” ngenxa yokuthi izimpande zawo ezinde kakhulu zifinyelela endaweni yeso. Lesi yisizathu sokuthi kungani ukutheleleka kuma-canine angaphezulu kwesinye isikhathi kungadluliselwa endaweni ye-orbital.

I-premolar (i-molar, evela kwisiLatini i-molaris, isuselwe kwi induku, okusho isondo lokugaya) wuhlobo lwamazinyo olusetshenziswa kakhulu ukugaya ukudla.

Ama-premolars abekwe phakathi kwama-canines, atholakala ngaphambili kwe-arch yamazinyo, kanye ne-molar, etholakala ngemuva. Amazinyo omuntu anama-premolars ayisishiyagalombili asakazwa ngale ndlela elandelayo:

• ama-premolars amane aphezulu, amabili awo atholakala emihlathini ngayinye engaphezulu engenhla.
• ama-premolars amane aphansi, amabili awo atholakala emihlathini ngayinye engaphansi ngayinye.

Ama-premolars angamazinyo abukeka njenge-cubic kancane, akha umqhele ngokuvamile onama-tubercle ayindilinga amabili.

I-molar (kusuka ku-Latin i-molaris, isuselwe kwi induku, okusho isondo lokugaya) wuhlobo lwamazinyo olusetshenziswa kakhulu ukugaya ukudla.

Akhiwe emgodini womlomo, ama-molars akha amazinyo angemuva kakhulu ku-arch yamazinyo. Amazinyo omuntu anama-molars angu-12 ahlala asakazwa ngale ndlela elandelayo:

• ama-molars aphezulu ayisithupha, amathathu awo atholakala engxenyeni ngayinye yomhlathi engenhla futhi alandela ama-premolars angenhla.
• ama-molars ayisithupha aphansi, amathathu awo atholakala emihlathini ngayinye engaphansi ngayinye futhi alandela ama-premolars angezansi.

I-molar yesithathu, okuthiwa amazinyo okuhlakanipha, ngokuvamile awumthombo wezinkinga nobuhlungu. Ikakhulukazi, zingabangela izifo noma ukugudluka kwamazinyo.

Nansi isimiso sokuqhuma komzimba kwamazinyo ahlala njalo

Amazinyo aphansi

- I-molars yokuqala: iminyaka engu-6 kuye kweyi-7

- Ama-incisors aphakathi: iminyaka eyi-6 kuye kweyi-7

- Ama-incisors angemuva: iminyaka eyi-7 kuye kweyi-8

- Ama-Canines: iminyaka eyi-9 kuye kweyi-10.

Ama-premolars okuqala: iminyaka eyi-10 kuye kweyi-12.

- Ama-premolars wesibili: iminyaka eyi-11 kuye kweyi-12.

- I-molars yesibili: iminyaka eyi-11 kuye kweyi-13.

- I-molars yesithathu (amazinyo okuhlakanipha): iminyaka engu-17 kuya kwengama-23 ubudala.

Amazinyo aphezulu

- I-molars yokuqala: iminyaka engu-6 kuye kweyi-7

- Ama-incisors aphakathi: iminyaka eyi-7 kuye kweyi-8

- Ama-incisors angemuva: iminyaka eyi-8 kuye kweyi-9

Ama-premolars okuqala: iminyaka eyi-10 kuye kweyi-12.

- Ama-premolars wesibili: iminyaka eyi-10 kuye kweyi-12.

- Ama-Canines: iminyaka eyi-11 kuye kweyi-12.

- I-molars yesibili: iminyaka eyi-12 kuye kweyi-13.

- I-molars yesithathu (amazinyo okuhlakanipha): iminyaka engu-17 kuya kwengama-23 ubudala.