Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 2 de 2
Filtrar
Mais filtros










Intervalo de ano de publicação
1.
Artigo em Chinês | WPRIM (Pacífico Ocidental) | ID: wpr-288933

RESUMO

<p><b>OBJECTIVE</b>To compare the shaping ability of ISO standard stainless steel K files and multi-taper ProTaper nickel-titanium files in simulated resin curved root canals. METHODS Thirty simulated resin root canals were randomly divided into three groups and prepared by stainless steel K files, hand ProTaper, rotary ProTaper, respectively. The amount of material removed from inner and outer wall and canal width after canal preparation was measured, while the canal curvature before and after canal preparation and canals aberrations were recorded.</p><p><b>RESULTS</b>The stainless steel K files removed more material than hand ProTaper and rotary ProTaper at the outer side of apex and inner side of curvature (P < 0.05). The mean degree of straightening in stainless steel K files group was significantly bigger than in ProTaper group (P < 0.05). The canals prepared by ProTaper had no evident aberration.</p><p><b>CONCLUSION</b>The shaping ability of ProTaper is better than stainless steel K files.</p>


Assuntos
Humanos , Ligas Dentárias , Instrumentos Odontológicos , Cavidade Pulpar , Falha de Equipamento , Níquel , Preparo de Canal Radicular , Aço Inoxidável , Titânio
2.
Artigo em Chinês | WPRIM (Pacífico Ocidental) | ID: wpr-288955

RESUMO

<p><b>OBJECTIVE</b>The aim of this study was to measure and analyze the anatomic characteristics of the pulp chamber of Chinese permanent anterior teeth radiographically.</p><p><b>METHODS</b>There were 137 human permanent anterior teeth to be used. The crown length, crown width and crown thickness were measured by vernier caliper. Labial-lingual and mesial-distal radiographs were obtained by parallel technique and Photoshop 8.0 was adopted for measuring the largest labial-lingual length, the largest mesial-distal length, the pulp chamber height and the distance between the lingual surface of the crown and the corresponding wall of the pulp chamber; the ratios of the largest labial-lingual length to the crown thickness, the largest mesial-distal length to the crown width and the pulp chamber height to the crown length were calculated. Finally the coefficients of variance were caculated.</p><p><b>RESULTS</b>(1) The ratios of the largest mesial-distal length to the crown width of maxillary and mandibular canines were statistically different from those of the other anterior teeth. There was not statistically significant difference for those ratios either between maxillary and mandibular canines or among incisors. (2) Indexes of the pulp chamber had higher variance than those of the external morphology. (3) The distance between the lingual surface of the crown and the corresponding wall of the pulp chamber had the smallest coefficient of variance. (4) The largest mesial-distal length of the pulp chamber had the largest coefficient of variance, except for the mandibular canines.</p><p><b>CONCLUSION</b>This study provided anatomical basis for clinical work; the distance between the lingual surface of the crown and the corresponding wall of the pulp chamber could be used as a depth reference for the endodontic access, and the access should not be extended excessively in mesial-distal direction.</p>


Assuntos
Humanos , Povo Asiático , China , Coroas , Dente Canino , Cavidade Pulpar , Dentição Permanente , Incisivo , Lábio , Maxila , Dente , Coroa do Dente , Raiz Dentária
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...