Introduction: Photodynamic therapy (PDT) is now a widely used treatment modality in many fields of dentistry, including endodontics. The most common application of PDT in endodontics is to disinfect root canals. The purpose of this study was to present the experience of using PDT in root canal disinfection of three patients. Case Presentation: Three patients referred to the Endodontics Department of Shahid Beheshti University of Medical Sciences were treated using 0.1 mg/mL Toluidine Blue (FotoSan® agent; CMS Dental, Denmark) irradiated with a light-emitting diode (LED) lamp (FotoSan®; CMS Dental, Denmark) with a mean wavelength of 630 nm and a mean power density of 3 W/cm2 over two 30-second periods. Conclusion: PDT using LED lighting can be used in conjunction with conventional root canal treatment (RCT) to achieve great results.

Facial attractiveness, influenced by dental esthetics, impacts self-perception and social interactions. The rise of social media has further fueled the demand for cosmetic dental treatments. This study aimed to examine the influence of self-esteem on the inclination of dentists, dental students, and laypeople toward esthetic dental treatments. This cross-sectional study involved 410 participants, including dentists, dental students, and laypeople, selected through convenience sampling. Data were collected using a questionnaire that captured sociodemographic characteristics, oral hygiene status, previous experience with esthetic treatments, inclinations toward esthetic dental treatments, and self-esteem levels using the Rosenberg Self-Esteem Scale (RSES). The questionnaire, created on the Porsline© website, was distributed via social media platforms. Data were analyzed using SPSS version 21, employing the Chi-square test and logistic regression, with a p-value of less than 0.05 considered statistically significant. The RSES showed that 16.3% of participants had low self-esteem, while 83.7% had high self-esteem. Among participants with previous cosmetic procedures, 84.3% expressed interest in pursuing additional treatments compared to 47.7% of those without such experience (P < 0.01). Among dental professionals, 38.3% of high and 37.5% of low self-esteem individuals expressed interest in cosmetic treatments (P = 0.42), while among laypeople, 66.6% of high and 82.2% of low self-esteem individuals indicated interest (P = 0.04). Regardless of profession, 66.7% of individuals with low self-esteem and 55.4% of those with high self-esteem expressed interest in esthetic treatments (P = 0.08). RSES scores varied significantly across age groups, with participants aged > 45 years showing the highest scores (P = 0.03). Regression analysis indicated that laypeople were more likely to seek esthetic dental treatments than dentists or dental students (OR = 3.02, 95% CI = 1.88–4.83). Participants with a history of esthetic dental treatments were also more likely to pursue further procedures (OR = 5.39, 95% CI = 2.97–9.77). Self-esteem significantly correlates with laypeople’s inclination toward cosmetic dental treatments. Dentists and dental students tend to express less interest in such procedures, likely due to their understanding of potential long-term complications. Additionally, individuals with prior experience in esthetic dental treatments showed greater interest in pursuing further treatments.

Objectives: Peri‐implantitis (PI) is the most common biological issue surrounding dental implants. According to current knowledge, the aforementioned complication is not equally distributed across different populations, and gene polymorphisms might be one contributing factor. The current study aimed to examine the association between gene polymorphisms of matrix metalloproteinase‐ (MMP‐) 1, ‐2, ‐3, ‐7, and ‐13 with PI in an Iranian demographic.Material and Methods: The study's sample included 50 subjects suffering from PI and 89 healthy controls. From each participant, a venous blood sample of 5 cc was obtained, and DNA was extracted. Gene polymorphisms were investigated using restriction fragment length polymorphism polymerase chain reaction (RFLP‐PCR) combined with electrophoresis. Statistical analyses were done using the Pearson chi‐square test, odds ratio, and t‐test via SPSS version 28.Results: The MMP‐3 (‐1171 5A/6A) and MMP‐7 (‐181 A/G) gene polymorphisms were significantly different between the patients with PI and healthy controls (PV < 0.001 and =0.025, respectively). MMP‐1 (‐1607 1G/2G), MMP‐2 (‐1306 C/T), and MMP‐13 (‐77 A/G) gene polymorphisms did not, however, differ in terms of prevalence between the two groups (PV > 0.05). Moreover, the presence of the 6 A allele in the MMP‐3 (‐1171 5A/6A) genotype resulted in a significant decrease in PI risk (PV < 0.001).Conclusions: Gene polymorphisms in the genotypes of MMP‐3 (‐1171 5A/6A) and MMP‐7 (‐181 A/G) were differential when comparing PI patients and healthy controls of the studied population.

Background: Estimating skeletal maturation and growth potential is essential for developing adolescents' best orthodontic treatment plan. The purpose of this study was to compare the duration of adolescent growth peak in subjects of skeletal classes I and III using the cervical vertebral maturation (CVM) method. Methods: This retrospective cross-sectional study included 116 Iranian subjects (skeletal class I = 68, skeletal class III = 48) aged 8–16 years old and without previous orthodontic treatments. Using Steiner and Wits analyses, two independent examiners traced pre-treatment lateral cephalograms to determine the subjects' skeletal relationship. The skeletal maturation was then assessed using Baccetti's CVM method. The onset and duration of adolescent growth peak (interval of CS3–CS4) were compared between two skeletal classes and two genders using independent samples t test. Results: In skeletal class I and III subjects, the adolescent peak had a mean duration of 1.62 (± 1.33) and 2.00 (± 1.27) years, respectively. The average difference of 0.38 years (4.6 months) between the two groups was statistically significant (p < 0.001). Furthermore, the onset age of adolescent growth peak was 11.91 (± 1.32) and 12.08 (± 1.31) years old in class I and III subjects, respectively. This age difference was not statistically significant (p = 0.630). Males’ adolescent growth peak occurred 1.44 years later (p < 0.001) and lasted 0.20 years less (p < 0.001). Conclusions: The adolescent growth peak started at a similar age in class I and III subjects, but the latter experienced the peak for 4.6 months longer. Moreover, females had an earlier and more extended adolescent growth peak.

Introduction: Gingival hyperpigmentation is caused by an increase in the amount of melanin production or the number of melanocytes in the epithelium, which can impair smile esthetics. The current study aimed to report the experience of using a diode laser for gingival depigmentation of three different patients.Case Presentation: Three adult patients are presented with hyperpigmentation in labial gingivae of both jaws. The depigmentation was done using a diode laser at a wavelength of 808 nm, fiber diameter of 300 μm, and power of 1 W and in continuous mode. All three patients showed proper resolution of hyperpigmented areas in short- and long-term follow-up sessions. However, degrees of recurrence were noticeable in two cases.Conclusion: The 808-nm diode laser can be utilized safely and efficiently in gingival depigmentation, resulting in an acceptable cosmetic outcome.