BMC Oral Health最新文献

Background: This study aimed to enhance understanding of how unilateral posterior tooth loss (UPTL) affects temporomandibular joint (TMJ) structures and to explore potential influencing factors on joint morphology.

Methods: The study included 68 subjects (34 patients with UPTL and 34 with complete dentition), divided into the missing group (n = 34 joint sides), the contralateral group (n = 34 joint sides), and the control group (n = 68 joint sides). Morphological measurement of the condyle, glenoid fossa and joint spaces were performed using cone-beam computed tomography (CBCT) and Mimics software. Analyses and comparisons were made among the three groups, with subgroup analyses based on the duration of tooth loss (< 1 year and ≥ 1 year), first molar loss, and the presence of unilateral chewing habit (UCH).

Results: Some significant differences among the control, the missing, and the contralateral groups were observed in measurements of the glenoid fossa and joint spaces (P < 0.05). When tooth loss lasted less than 1 year, the contralateral side exhibited significantly larger posterior joint spaces than the missing side (P < 0.05), whereas no differences were observed at ≥ 1 year. In the first molar loss subgroup, the anteroposterior and mediolateral diameters of the glenoid fossa were significantly larger on the contralateral side than on the missing side (P < 0.05). Moreover, unilateral chewers with UPTL exhibited significantly smaller anteroposterior condylar diameters on the preferred chewing side (P < 0.01).

Conclusion: An overall enlargement of both the glenoid fossa and joint spaces was observed in patients following UPTL; the glenoid fossa was found to be more susceptible to bone resorption than the condyle. Factors such as the duration of tooth loss, the absence of the first molar, and UCH contribute variably to these structural changes, indicating that different tooth-loss conditions can impose distinct biomechanical impacts on the TMJ.

Background: Oral health has an impact on the patient's quality of life. This study aimed to translate, culturally adapt, and comprehensively validate the Dental Impact on Daily Living (DIDL) index for use among Spanish-speaking adults, encompassing the assessment of its reliability and construct validity. A secondary aim was to correlate the Sp-DIDL with demographic data, caries, periodontal attachment loss, and the use of prosthesis.

Methods: The original DIDL was translated and adapted into Spanish following international guidelines. A pilot test was done with 20 patients to assess comprehension and validity. Psychometric properties were evaluated in a cross-sectional study using a convenience sample of 125 adults (mean age 49.3 years) recruited from the Dental Hospital of the University of Barcelona. Internal consistency was analysed with Cronbach's alpha. Intraclass Correlation Coefficient (ICC) was used to assess the test-retest reliability of the clinical measures (DMF index and periodontal attachment loss). Confirmatory Factor Analysis (CFA) and Known-Groups Validity were used to evaluate construct validity. The associations with demographic data, the Decayed-Missing-Filled (DMF) index, periodontal loss, and the use of prosthesis were assessed using one-way ANOVA, Student t-tests, Pearson's correlation, and multiple linear regression analysis.

Results: The final version of the Sp-DIDL was approved after testing on 20 patients (Cronbach's α = 0.919). In the validation stage, all Cronbach α values were > 0.90, indicating excellent internal consistency. The 5 factors had an explained variance over 0.40 (0.51 to 0.78). The mean DIDL score was - 1.08 (standard deviation (SD) = 1.82). Overall, the Sp-DIDL score showed a negative correlation with age (r = -0.535, p < 0.001) but was not associated with gender (p = 0.235). Patients with elementary studies or less had lower Sp-DIDL scores (p < 0.05). DMF was negatively correlated with Sp-DIDL (r = -0.318; p < 0.001). Patients with dental prostheses had lower Sp-DIDL scores (p < 0.05). The multiple lineal regression model only included age as a predictor of Sp-DIDL score (B = -0.049; p < 0.001).

Conclusions: The DIDL questionnaire was validated in a Spanish population. This Spanish version of the DIDL proved valid and reliable for measuring the impact of oral health on patient quality of life. The Sp-DIDL was negatively correlated with age: the older the patient, the greater the impact of oral health status upon quality of life.

Objective: To evaluate the effects of bleaching on the optical properties, surface roughness, and microhardness of various single-shade resin composites.

Materials and methods: A total of 210 disc-shaped specimens (6 mm × 2 mm) were fabricated using seven single-shade resin composites (Clearfil Majesty ES-2 Universal, Essentia Universal, Vittra Unique, Charisma Topaz One, OneShade, Omnichroma, and Zenchroma) (n = 30 / group). After 24 h of storage in distilled water at 37 (±) 1 °C, all specimens were immersed in a coffee solution for 144 h. Color change (ΔE₀₀), whiteness index (ΔWI_D), translucency parameter (TP), and gloss (GU) were measured using a spectrophotometer and a glossmeter. Surface roughness (Ra) and Vickers microhardness (VHN) were evaluated at baseline (T0), following staining (T1), and following bleaching (T2) using Opalescence Boost (HP) or Opalescence Quick (CP). Data were analyzed using the Shapiro-Wilk test for normality, followed by Robust ANOVA and Bonferroni post-hoc tests (α = 0.05).

Results: All restorative materials exhibited color changes exceeding both the perceptibility (PT > 0.8) and the acceptability (AT > 1.8) thresholds. The highest discoloration was observed in the VU*CP subgroup (9.05 ± 1.05), while the lowest was observed in the ZC*HP subgroup (1.85 ± 0.43). Both mean Ra and VHN values differed significantly among the restorative materials, regardless of bleaching agent and time-period (p < 0.001).

Conclusion: All tested single-shade resin composites exhibited perceptible and clinically unacceptable color changes. The HP bleaching agent demonstrated the greatest negative effects on surface roughness and microhardness, while among the single-shade resin composites, CME and EU showed the highest degree of susceptibility to these effects. The interactions between restorative materials and bleaching agents should be taken into account when planning the bleaching of restored teeth.