Chemical erosion is the loss of superficial tooth structure by chemical action in the continued presence of demineralizing agents. This can be prominent in patients with oral habits such as constant citrus ingestion (like lemon chewing), chlorinated swimming pool water or gastrointestinal problems that produce repeated exposure of teeth to gastric acids. In this case report, a multidisciplinary approach to restore the severe wear due to dental erosion by proper techniques and materials was presented.

Background The aim of this in vitro study was to evaluate the microindentation hardness and chemical composition of residual dentin left at the cavity bottom following removal of carious dentin using the Carisolv chemomechanical and Er:YAG laser caries excavation methods in comparison with the conventional tungsten-carbide bur excavation.Methods Sixty-nine extracted permanent teeth with occlusal dentin caries were assigned into three groups according to caries removal technique. Carious dentin excavation was guided by tactile method and a caries-staining dye. In stereomicroscope images (100×) of the samples, the presence or absence of residual caries was defined. The Knoop hardness value of the cavity floor was determined and atomic analysis of treated cavities was performed by energy dispersive X-ray spectroscopy.ResultsThe Knoop hardness value of residual dentin left at the cavity bottom was lower (One-way ANOVA, Dunnett-C, p < 0.05) and the percentage of samples with remaining carious dentin was higher after Carisolv excavation than those obtained after conventional and laser excavations (Kruskal–Wallis, Mann–Whitney U, p < 0.05). No significant differences were found between the quantities of calcium content (Ca wt%), phosphorus content (P wt%) and calcium/phosphorus ratio of the cavities treated by three techniques (Kruskal–Wallis, Mann–Whitney U, p > 0.05).ConclusionThe results indicated that Er:YAG laser was more comparable to conventional bur excavation than chemomechanical method in the efficacy of caries removal with regard to microindentation hardness of remaining dentin and both Carisolv gel and Er:YAG laser did not alter chemical composition of residual dentin in the treated cavities.

Aim This study sought to determine the prevalence of dentine hypersensitivity (DH) among adults in Turkey. Also, to ascertain the association between DH and both etiological predictors and demographic patient characteristics. Material method Using a questionnaire and thermal and evaporative tests, 259 women and 209 men in the age range of 18 to 72 were analyzed. Individually, a clinical evaluation of DH signs was conducted. The DMFT index, gingival index, and gingival bleeding were reported for each subject. The gingival recession and tooth wear of sensitive teeth were also evaluated. Pearson Chi-square test was used to compare categorical data. Logistic Regression Analysis was used to examine the risk factors of DH. Data with dependent categorical variables were compared using the McNemar-Browker test. The significance level was p < 0.05. Results The average age of the population was 35.6 years. In the present study, a total of 12,048 teeth were analyzed. 1755 had thermal hypersensitivity (14.57%), while 470 experienced evaporative hypersensitivity (3.9%). The incisors were the teeth most impacted by DH, whereas the molars were the least affected. Exposure to cold air and sweet foods, gingival recession, and the presence of noncarious cervical lesions were all strongly linked to DH (Logistic regression analysis, p < 0.05). The cold stimulus increases sensitivity more than the evaporation stimulus. Conclusion Significant risk factors for both thermal and evaporative DH include cold air, consumption of sweet food, presence of noncarious cervical lesions, and gingival recession. More epidemiological research in this area is still required to fully characterize the risk factors and implement the most effective preventive interventions.

Amaç: Bu in vitro çalışmanın amacı, dehidratasyon süresinin çekilmiş insan dişlerindeki renk değişimine etkisinin bir spektrofotometre kullanılarak belirlenmesidir. Materyal-Metot: 15 adet çekilmiş insan üst keser dişi kullanıldı. Dişlere ait renk analizi bir spektrofotometre cihazıyla (SpectroShade Micro, MHT, İtalya) gerçekleştirildi. Başlangıç renk ölçümü, diş yüzeyindeki fazla su uzaklaştırıldıktan sonra yapıldı. 2. ve 3. ölçümler sırasıyla, dişler 1 ve 2 saat kurutulduktan sonra gerçekleştirildi. Tüm ölçümler beyaz ve siyah olmak üzere iki farklı zemin kullanılarak yapıldı. Dişlerin L*, a* ve b* değerleri tespit edildi ve iki ayrı ölçüm aşaması arasında oluşan renk değişim (ΔE) değerleri hesaplandı. Farklı dehidratasyon zamanı arasındaki L*, a*, b* ve ΔE değerleri arasındaki fark karşılaştırıldı. İstatistiksel analiz, genelleştirilmiş lineer model, Tukey HSD testi, iki yönlü Robust testi ve Bonferroni post-hoc düzeltmesi ile yapıldı. Tüm testlerde anlamlılık düzeyi p&lt;0,05 idi. Bulgular: Zaman ana etkisi, L* değerleri üzerinde istatistiksel fark yarattı. Başlangıç L* değerleri ortalaması; dehidratasyondan sonra elde edilen L* değerleri ortalamasından küçük idi (p&lt;0.05, Varyans analizi). Örneklerden, beyaz zeminde elde edilen b* değerlerinin ortalaması; siyah zeminde elde edilen b* değerlerinin ortalamasından daha düşük idi (p&lt;0.05, Varyans analizi). Faklı zaman aralıklarında ve farklı zeminlerde, örneklerden elde edilen ΔE değerleri arasında istatistiksel fark yoktu (p&gt;0.05, Robust testi). Sonuç: Bu çalışmanın bulgularından, dehidratasyon süresinin dişlerin rengini etkileyebileceği ve dehidratasyondan 1 saat sonra ve daha uzun sürede diş renginin olduğundan daha açık görünebileceği sonucuna ulaşılabilir.