Tsawg cov kab noj hniav tsawg dua yuav tsum ua haujlwm tsawg tsawg, yog li ua rau cov kab noj hniav tsis tuaj yeem yuav ua rau cov nqi qis dua ua cov nqi pwm.
Raws li muaj pes tsawg tus kab noj hniav ua si lub luag haujlwm tseem ceeb hauv molding cov nqi, ces qhov tsis yooj yim ntawm qhov tsim. Txoj kev nyuaj yuav raug muab tso rau hauv ntau yam xws li ntuav, kev xav kom ua tau, sab hauv lossis sab nraud, zoo nkauj los yog pes tsawg tus undercuts uas tsim nyog.
Cov ntsiab lus tseem ceeb ntxiv, xws li cov kev pabcuam lossis lwm yam uas ua rau muaj kev sib txuas ntxiv, yuav ua rau kom muaj cov nqi pwm. Qhov kawg ntawm qhov tseem ceeb ntawm cov tub ntxhais thiab kab noj hniav tuaj yeem cuam tshuam qhov nqi.
Roj hmab txhaj tshuaj molding txheej txheem tsim tawm high yield ntawm cov khoom ruaj, ua nws feem ntau npaum thiab npaum-zoo txoj kev molding. Txuj ci txheej txheem npliag los ntawm kev tswj cov dej kub kom txo tau tag nrho cov khoom pov tseg.