Objective:To investigate the effect of diameter of root canal foramen on the accuracy of two apex locators.

目的：研究根尖孔直徑對兩種根管長度電測儀Root ZX和Neosono Ultima EZ測量準確性的影響。

Result These difficult root canals caused by broken instruments, luting cement and resinifying agent in canals, root canal calcification and root canal perforation were managed with the success rate of 82.35%, 82.14％, 76.32％and 100.00％ respectively;the incidence of root canal perforation in severe curved root canals was 35.14％during the course of the treatment.

結(jié)果 應用根管顯微鏡超聲聯(lián)合技術處理折斷器械WWW.AAA日本高清视频、根管內(nèi)原充填物免费看日批视频、根管鈣化、根管側(cè)穿的成功率分別為82.35%国产精品自在在线午夜、82.14％亚洲激情视频网、76.32％、100％A大片黄片视频；重度彎曲根管側(cè)穿的發(fā)生率為35.14％日本女色视频。

The existence of the distal third root canal in the lower first molar, which increased by the emergence of root canal missed chances in the clinical treatment, so it is very important to double-check the number of root canals when operating root canal treatment.

下頜第一磨牙遠中第三根管的出現(xiàn)增加了臨床治療中遺漏根管的機率，因而根管治療時對根管數(shù)目的仔細檢查非常重要动漫高潮娇喘抽搐喷水视频。

Motheds: to select 336 lomars with pulposis or apicitis from the aged and to devide them into two groups. in group the control group,the illed teeth were given only the root canal therapy. in group the experimental group, according to the difference of every root canal, the unobstructed root canals were treated by root canal therapy. while the obstructed ones were given the root canal resinifying, use two kinds of therapy method together to molais' pathological changes.then their curative effects were observed after two year.

選取336例中老年人患有不可復性牙髓炎A级黄色网站在线免费观看视频、牙髓壞死、牙髓鈣化一级毛片免费网站视频中文、牙內(nèi)吸收和急在线观看视频黄页、慢性根尖周炎的患牙358顆，隨機分為對照組和實驗組无码最新首页，對對照組行常規(guī)根管治療国产精品亚洲日韩欧美第一页，對實驗組則根據(jù)每個牙齒各根管的不同情況，采用根管-塑化聯(lián)合治療在线日韩成人电视免费观看网站视频，觀察2年進行臨床評價欧美日韩在线视频网。

At the root canal therapy process, hidden in the root canal isthmus, bifurcation area, triangle, shape and irregular dentinal tubules within the Enterococcus faecalis prepared by mechanical means it is difficult to remove, it can be biofilm, proton pump tolerance mechanisms such as root canals harsh ecological environment, to avoid conventional drugs, the role of disinfection, resulting in the failure of root canal therapy.

在根管治療過程中，隱藏在根管峽部秋霞电影网717、分叉區(qū)亚洲伊人色宗网一区二区、三角區(qū)、形態(tài)不規(guī)則區(qū)及牙本質(zhì)小管內(nèi)的糞腸球菌難以用機械預備的方法去除偷拍美女插B，它可通過生物膜欧美91影院、質(zhì)子泵等機制耐受根管內(nèi)苛刻的生態(tài)環(huán)境，躲避常規(guī)消毒藥物的作用a片在线观看的，從而導致根管治療的失敗爱爱网站1000。

A group: to measure the length of root canal by Root ZX, prepare the root canal and test the trial point for a best position of the major Gutta Percha Point in root canal obturation with lateral compaction, then take X-ray photos.

隨機選擇需行根管治療術的單根管恒前牙、雙尖牙 2 30顆黄片一级片免费看，分為A91部精品国产费观、B兩組，A組采用RootZX 根管測量儀測量根管長度欧美视频在线一区二区三区，根管預備后黄色一级免费片，根管充填時加試尖步驟，調(diào)試出最適主尖后側(cè)壓充填根管十八禁视频网站，攝牙片

Root canal therapy is the most fundamental and efficient way to cure endodontics and periapical diseases.

根管治療術(root canal therapy26uuuu综合， RCT)是治療牙髓病和根尖周病的最基本和最有效的方法。

RCT can be divided into 3 steps, including root canal preparation, root canal disinfection, and root canal obstruction, of which the canal obstruction is very important, for the treatment efficiency will be greatly affected with uncondensed or mislocated obstruction.

根管充填的作用很重要国产黄色视频在线免费播放，如果根充不密合求国产精品网址、根充不到位等，均會影響根管治療的成功率2020人人操人人摸。

Key words］root canal apex locator; periapical diseases; dental pulp cavity; working length; aged

1.2 方法常規(guī)開髓揭頂亚洲一区亚洲二区，清理根管，將root zx根管測量儀電極置于被測牙的對側(cè)口角處多人作爱一级黄片，探測端接10號k型銼超碰在线97在线，緩慢進入根管，當測量儀顯示到達根尖孔時免费看特级婬片日本，用制動片記錄其長度日三级视频，直接攝x線片證實k型銼所到達的位置，確定根管測量儀的準確性久久东京热视频。

The method locates with Raypex5 root needle appearance has a tooth to 205 in all 403 roots canal undertakes length of root canal job is measured, after undertaking with this length the root is in charge of provision to fill up, film X line piece the quality that observes root canal fills up.

方法用Raypex5根尖定位儀對205顆患牙共403個根管進行根管工作長度測量国产日韩字幕欧美，以此長度進行根管預備充填后拍攝X線片觀察根管充填的質(zhì)量。