Study on the therapeutic efficacy of root canal preparation using pathfile in combination of protaper / 中国医师杂志

Objective To evaluate the clinical effect of the use of pathfile and protaper nickel-titanium instruments for machine in root canal preparation.Methods A total of 200 patients suffering from pulpitis and periapical that needs root canal treatment was randomly divided into two groups according to treatment order (100 patients/each group).The experimental group was used pathfile and protaper in root canal preparation,and filled with warm gutta vertical condensation.The control group was used protaper root canal preparatory standards method,and filled with warm gutta vertical condensation.The required time of two sets of root canal preparation and the number of equipment broken were recorded,and X-ray film at the preoperation intraoperation and postoperation were used to evaluate effect of preparation and root filling.Results In the root canals prepared of the two groups,no issued offset,no side wear,no step-forming,and no position changed of the apical foramen were occurred,which was consistent with preperative X-ray film.One case was occurred fracture of instrument in the experimental group and the control group,it was Slfile.Tooth position was right mandibular,second molar nearly the root apical 1/3,and upper left second molar mesial buccal root apical position.The root canal preparation time of experimental group was significantly shorter than the control group[the front teeth:(4.73 ± 1.12) min vs (6.32 ± 1.84) min,t =2.243,P ＜0.05; the premolars:(7.83±1.23)min vs (10.25±2.68)min,t =2.475,P ＜0.05; the molars (10.14 ± 1.18) min vs (15.43 ± 5.94) min,t =2.991,P ＜ 0.01].Postoperative X-ray showed that 2 cases were occurred small amount of paste overfilled,the root canal closed tight,no less filling; and 3 cases of the control group occurred paste overfilled,no less filling too.Conclusions The use of nickel-titanium instruments pathfile and protaper for machine in root canal preparation is feasible,and improves the efficiency of root canal preparation.

Canal-centring ability of three rotary file systems in simulated curved canals: A comparative study.

Objective: To compare the canal-centring ability of M two , ProFile and RaCe rotary files, in simulated curved canals. Materials and Methods: About 30 simulated canals were prepared by M two , ProFile and RaCe rotary files. Pre and post-operative pictures were super-imposed and transportations recorded. Measurements were carried out at five different points: Canal orifice (O); half-way to the orifice in the straight section (HO); the beginning of the curve (BC); the apex of the curve (AC); the end point (EP). Intra- and inter-group comparisons were carried out by Wilcoxon`s signed ranks test and Kruskal-Wallis test respectively, using SPSS 14.0 software. Results: ProFile did not change canal centricity in any point. RaCe kept centricity at HO, BC, AC and EP. M two changed canal centricity in points BC, AC and EP. M two group kept the centricity significantly less than the other two groups at BC (P = 0.004), AC (P = 0.015) and EP (P = 0.01). There was no significant difference between these three rotary files at HO. However, the difference between RaCe, M two and ProFile was significant at O (P = 0.015). Conclusion: ProFile and RaCe rotary files remained better centred than M two rotary files.

Avaliação de três métodos de estudo empregados para a análise do preparo do canal radicular / Evaluation of three methods employee for root canal preparation analysis

A evolução da endodontia ocorre continuamente de modo que sistemas, técnicas e instrumentos endodônticos têm sido criados e estudados por diversos autores por meio de diferentes métodos analisando seu desempenho. O presente estudo teve como objetivo avaliar aspectos relacionados ao preparo do canal radicular assim como também analisar os métodos de estudo empregados para este fim. Foram empregadas 10 raízes mésio-vestibulares de molares superiores humanos extraídos, as quais foram incluídas em blocos de resina e seccionadas transversalmente nos terços médio e apical. Para a instrumentação foi empregado o sistema Race. A análise do preparo foi feita por meio da Plataforma Radiográfica, do Método de Bramante e do Método Histológico. Foi observado que, diante de uma padronização dos métodos de estudo empregados, é possível obter resultados coerentes entre cada um, mesmo quando se avalia aspectos diferentes do preparo do canal radicular. Pesquisas que avaliam o mesmo aspecto do preparo podem apresentar resultados diferentes e estas diferenças podem estar associadas a variáveis inerentes a cada sistema de avaliação empregado. Em relação ao método de estudo concluiu-se que todos forneceram informações importantes para a análise do preparo do canal radicular, no entanto, não devem ser considerados individualmente. De acordo com o aspecto avaliado, um método pode complementar o outro e, desta forma, atingir resultados fidedignos. Em relação aos aspectos do preparo concluiu-se que o sistema Race mostrou ausência de desvio apical, ação sobre todas as paredes dentinárias, deslocamento do preparo em direção às paredes externa da curvatura e vestibular do canal radicular, ampliação da área nos terços médio e apical, superfícies dentinárias regulares, formato irregular e pequena quantidade de resíduos na luz do canal radicular.

There is an usually endodontic evolution thus rotary systems and techniques has been created and evaluated by several authors by different methods. The purpose of this study was to investigate root canal aspects and the methods employed to evaluate the root canal preparation. Mesiobuccal canals of ten maxillary molars extracted human were included in blocks of resin and split across the middle and apical thirds. The root canals were prepared by RaCe rotary files. The prepare analysis was done through the Radiographic Platform, Bramante method and Histological method. It was observed that before the methods standardization it can get consistent results between each one even when assessing different aspects of the root canal preparation. It was concluded that studies that evaluate the same aspect of the preparation may show different results and these are associated with variables inherent in each methodology employee. All the methods supplies important information about root canal preparation. However, it is not should be separately considered. In accord to the evaluated aspect a method can supplies the other one and get reliable results. In relation to the aspects of the preparation it was concluded that the Race system showed apical deviation absence, action on all the walls, displacement to the external curvature walls and vestibular, magnifying of the area, regular surfaces, irregular format and small amount of residues inside the root canal.