Introduction: This cross-sectional study aims to investigate the association between three age-specific questionnaires in three age groups and restorative dental treatment need. Materials and methods: Three separate questionnaires were designed on etiology of dental caries in different age groups. Randomly selected 15- (n = 36), 21- (n = 21), and 40-year-old (n = 45) subjects answered these questionnaires. Responses were compared to restorative treatment need (DT) according to the clinical oral examination, which calibrated examiner performed. Results: Responses to questionnaires were only indicative in prediction of restorative treatment need at individual level. Kappa values for 15-, 21-, and 40-year olds, between responses and restorative treatment need were 0.01, 0.44, and 0.33, respectively. Conclusion: The need for restorative care could plausible be screened with a questionnaire among the 21- and 40-year olds, but not among 15-year olds in a country with low caries prevalence. Further development of questionnaires and studies are needed.

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Introduction: Both RaCe and Mtwo rotary systems introduced the 10/0.04 file as the first file used in the root canal (Glide path). This study aims to compare different factors of both the rotary systems, including cutting efficacy, file fracture, topography changes of files, and changes of the root canal. Materials and Methods: In this laboratory study, 12 RaCe and 12 Mtwo files were prepared and tested on 24 resin blocks with 30° curvature. The time to reach the working length was recorded. Topographical changes of the files have been observed with a stereomicroscope if needed. Changes in resin blocks were measured by photographing and using Photoshop software. Data were analyzed through an independent two-sample t test and likelihood-ratio chi-squared test. Results: Time to reach the working length was significantly lower in the RaCe group than in the Mtwo group (3.57 ± 0.56 s vs. 10.33 ± 2.25 s, P < 0.001). File fracture did not occur in any of the two rotary systems. Topographical changes of the files in RaCe group were also less than the Mtwo group (P = 0.032). Conclusion: The RaCe file is faster in reaching the working length. Both files are safe and do not cause drastic changes in the root canal.

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Objectives: Trimethylbenzoyldiphenylphosphine oxide and phenylpropanedione photoinitiator components in resin composites have been used widely due to their white color. However, it seems that there are some limitations in the required polymerization initiator wavelength. This study aimed to evaluate the polywave and monowave light-activating devices (LEDs) on polymerization and shrinkage strain of two dental composites with different photoinitiator systems. Methods: In this experimental study, 24 samples were prepared in two groups, including G-Aenial A2 and bleach composites. Each group was divided into two subgroups: one cured by monowave LED unit and the other by polywave device. Then shrinkage strain of samples was evaluated using bonded disk technique. Results: Results showed the shrinkage strain of A2 and bleach composites using PW device was significantly greater than MW device. In addition, the A2 composite shrinkage action polymerized with MW device was significantly lower than shrinkage action of A2 and bleach composite using PW machine. Conclusion: The findings of this study revealed that polywave LEDs were more beneficial for the polymerization of resin composites.

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Introduction: Calcium hydroxide must be completely removed from the root canal before the endodontic therapy. One of the methods to remove calcium hydroxide is XP-endo finisher file which has conflicting results. This study aimed to compare the efficacy of XP-endo finisher in removing calcium hydroxide with other irrigation methods. Materials and methods: In this experimental in vitro study, 48 teeth were selected. Each tooth was split longitudinally. Standardized grooves were prepared in the middle and apical third of the canals and then were filled with calcium hydroxide. The roots were randomly divided into three groups according to calcium hydroxide removal methods: XP-endo finisher, passive ultrasonic irrigation, and syringe needle irrigation. The amount of remaining medicament was evaluated using a scoring system. Chi-square was used to study the difference between the qualitative variables. The significant level was P < 0.05. Results: In the middle part, XP-endo finisher removed calcium hydroxide significantly higher than other methods (P = 0.005). In the apical part, no significant difference was observed among the groups (P = 0.47). Conclusion: All methods removed more calcium hydroxide in the middle than the apical part. In the middle part, XP-endo finisher removed calcium hydroxide more than the other methods from the root canals.

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Facial defects affect a patient’s quality of life in different aspects of psychologic health, social contacts, and functional abilities. Our report describes a 65-year-old patient who was undergone rhinectomy surgery due to nasal basal-cell carcinoma. We considered to rehabilitate the nose using two dental implants and a reversed triangle abutment to gain the best retention results for the final nasal prosthetic. The implant-supported prosthetics does not need surgery on the patient for graft, tissue transfer, or such procedures. It can effectively restore the nose in a satisfactory esthetic manner.

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Background: This study investigated the impact of sonic vibration on the root dentin-glass fiber post bond strength using two resin cements. Materials and methods: Forty single-canal teeth were randomly divided into four groups (n = 10): Theracem self-adhesive using sonic vibration, Duo-link cement using sonic vibration and abrasion, Theracem self-adhesive, and Duo-link cement. Data were analyzed by one-way analysis of variance, Tukey test, and independent t test (α = 0.05). Results: In the coronal region, the bond strength was not significantly different among the four groups (P = 0.331). In the apical region, the bond strength was significantly higher in the Duo-link cement using sonic vibration than in the Theracem cement using sonic vibration (P = 0.010) and Theracem cement using the conventional method (P = 0.007). Conclusion: Sonic vibration has positively affects the push-out bond strength of glass fiber post to root dentin using Duo-link cement.

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