Objective:The aim of this study was to comparatively assess the fracture resistance of the cementum-extended and conventional composite fillings with or without intracanal composite posts in severely damaged deciduous incisors.Materials and Methods:This in vitro study was performed on 60 extracted deciduous maxillary incisors that were randomly divided into four groups: Group 1: Composite filling (CF); Group 2: Composite filling with composite posts (CF + CP); Group 3: Composite filling extended 0.5 mm to cementum (ceCF); Group 4: Composite filling extended 0.5 mm to cementum with composite posts (ceCF + CP). The fracture resistance was assessed by exerting a progressively increasing load with a cross-head speed of 0.5 mm/min in a Universal Testing Machine.Statistical Analysis:Data were analyzed by SPSS-18 using one-way analysis of variance at α < 0.05.Results:The mean fracture resistance (MFR) values of the experimental groups were 410.57 ± 139.44 N, 564.44 ± 92.63 N, 507.5 ± 76.37 N and 601.08 ± 96.04 N. A significant difference was found between the MFR of Groups 1 and 2, Groups 1 and 4 and Groups 3 and 4 (P < 0.05).Conclusion:A superior outcome was achieved by intracanal composite posts in both conventional and cementum-extended composite fillings.
Introduction. Identifying the external root resorption plays an important role in treatment planning for deciduous teeth. Although proper accuracy of digital radiography in the diagnosis of external root resorption has been established in permanent dentition, it cannot be at all generalized to the primary root being superimposed by the succeeding permanent teeth. Interestingly, no study has assessed this in primary teeth yet. Thus, this study was undertaken for the first time. Methods. This was a single-blind prospective clinical diagnostic study performed on 501 observations (observed by 3 observers) pertaining to 167 roots of 45 maxillary/mandibular primary molars (in 6–8-year-old patients) which were indicated for extraction and did have succeeding permanent teeth. Digital parallel periapical radiographs were taken before dental extraction using a PSP sensor. Radiographs were printed and examined by two pediatric dentists. After the extraction, the extent of resorption was directly measured, twice, by third and fourth observers blinded to radiographic estimates. Radiographic errors and absolute errors (mm) were calculated. Various parameters were analyzed statistically. Results. Of the roots, 56.3% were really resorbed with (mean = 5.01 ± 2.10 mm). First/second observers failed to identify 19.6% and 38.3% of roots, respectively. Average errors were −0.77 ± 2.31 and 0.14 ± 2.19 mm in girls and boys, respectively ( P = 0.043 , t-test). The factors “side, jaw, tooth type, and root type” did not affect errors ( P > 0.05 ). Average absolute errors were 1.79 ± 1.47 mm (significantly above zero, P < 0.0005 ). No evaluated factor affected it ( P > 0.1 ). Actual lesion sizes correlated with errors (Pearson R = 0.682, P < 0.0005 ) but not with absolute errors ( P = 0.464 ). Conclusion. Although many deciduous roots might be missed, digital radiography might still provide rather a good accuracy in diagnosis and measurement of external root resorption up to about 1.8 mm absolute error. Observers might overestimate resorption sizes in girls and in cases with actual lesions smaller than 3 mm. Size of the lesion can influence the direction of error (shortening/elongation), but not its directionless magnitude.
Purpose: Since various factors such as parents' attitudes and knowledge can affect the use of fluoride, this study aims to assess the relationship between children's parents' attitudes and knowledge towards preventive caries methods with their children's caries experience. Materials and Methods: In this cross-sectional study, 110 parents of preschool children in Ahvaz were randomly selected. Using a questionnaire, parents' knowledge and attitude about fluoride therapy were evaluated, and their children's teeth were examined for dmft. Data were analyzed by Mann-Whitney and Kruskal-Wallis tests. Results: The mean of parents' knowledge about caries prevention methods was 2.22 ±3.23 of 9, and the knowledge of 68% was poor, 21% moderate, and 11% was good. The mean of parents' attitude about caries prevention techniques was 9.5±2.05 of 14, and the attitude of 0% was poor,60% moderate, and 40% was good. There was no significant relationship between parents' knowledge with gender, age, education, source of information, and dmft. There was a direct relationship between knowledge and the experience of professional topical fluoride (PTF). There was no significant relationship between the attitudes of parents with gender, the history of PTF, and the source of information. There was a direct, significant relationship between parents’ attitude and their educational level, age, and child’s dmft. Children's experience of PTF was 18.6%. Conclusion: Parents' knowledge and attitude towards fluoride roles in the prevention of dental caries were low. So, assigning programs to increase parents' knowledge and, subsequently, using caries prevention techniques is suggested.
Background:This study was carried out to evaluate the effect of root canal filling on the bond strength of three intracanal posts in the primary incisors.Materials and Methods:Sixty primary incisors were prepared and then divided into two groups (n = 30). The first group canals obturated with zinc oxide eugenol (ZOE) and Group 2 canals obturated with Metapex. Further, the two group categories were divided into three subgroups (n = 10): (1) short composite post (SCP), (2) glass fiber posts (GFPs) cemented with flowable composite, and (3) GFP with glass ionomer cement (GFP + GIC). The push-out test was performed with a universal testing machine. The results were statistically analyzed with two-way analysis of variance.(α = 0.05).Results:The mean bond strength of the first group obturated with ZOE was lower than that of the second group obturated with Metapex (P = 0.046). Moreover, from a statistical point of view, in all three subgroups, the correlation of mean push-out bond strength between SCP and GFP coated with flowable composite was not substantial at P = 0.97. However, the mean bond strength of SCP was in fact significantly greater than that of the GFP coated with GIC since P = 0.034.Conclusion:Using ZOE resulted in the significant reduction of the mean bond strength of the intracanal posts when utilized in the primary anterior teeth. Likewise, SCP and GFP coated with flowable composite showed higher push-out bond strengths for restoring primary anterior teeth.
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