Health of dentists in southern Thailand

Objective: The aims of this study were to investigate the prevalence and nature of some health and lifestyle problems of dentists in southern Thailand.\ud \ud Method: The design was a cross-sectional study using a self-report questionnaire distributed to all 220 dentists working in 14 provinces in southern Thailand in 1997.\ud \ud Results: One hundred and seventy-eight 178 (80.9%) dentists aged 22–54 years responded. Only about one third of dentists 65 (36.7%) reported exercising on a regular basis. Almost one fifth of dentists 35 (19.1%) reported that they consumed alcohol on a weekly basis. Few dentists 4 (2.4%) reported regular smoking. Almost all dentists reported that their practice of dentistry has increased stress or stress-related problems 171 (96.1%). More than two thirds of respondents had had some known or unknown systemic health problem since graduation 112 (71.8%), although most dentists reported having no systemic disease at present 104 (59.1 %).\ud \ud Conclusions: The present study has indicated that dentists in southern Thailand report a high career prevalence of stress, a moderate career prevalence of work-related problems which may be related to job satisfaction, and moderate career prevalence of systemic disease. Further continuing education and investigation of appropriate interventions to improve rates of exercise amongst dentists in southern Thailand is needed

Flexural strength of fluorapatite-leucite and fuorapatite porcelains exposed to erosive agents in cyclic immersion

OBJECTIVE: The aim of this study was to evaluate the fexural strength of two porcelain materials (IPS d.SIGN and IPS e.max Ceram) exposed to erosive agents. MATERIAL AND METHODS: One hundred and twenty bar-shaped specimens were made from each of fuorapatite-leucite porcelain (IPS d.SIGN) and fuorapatite porcelain (IPS e.max Ceram) and divided into 8 groups of 15 specimens each. Six groups were alternately immersed in the following storage agents for 30 min: deionized water (control), citrate buffer solution, pineapple juice, green mango juice, cola soft drink and 4% acetic acid. Then, they were immersed for 5 min in deionized water at 37ºC. Seven cycles were completed, totalizing 245 min. A 7th group was continuously immersed in 4% acetic acid at 80ºC for 16 h. The final, 8th, group was stored dry at 37ºC for 245 min. Three-point bending tests were performed in a universal testing machine. The data were analyzed statistically by 2-way ANOVA, Tukey's HSD test and t-test at signifcance level of 0.05. RESULTS: The fexural strengths of all groups of each porcelain after exposure to erosive agents in cyclic immersion did not differ signifcantly (p>0.05). For both types of porcelain, dry storage at 37ºC yielded the highest fexural strength, though without signifcant difference from the other groups (p>0.05). The fexural strengths of all groups of fuorapatite porcelains were signifcantly higher (p<0.05) than those of the fuorapatite-leucite porcelains. CONCLUSIONS: This study demonstrated that the erosive agents evaluated did not affect the fexural strength of the tested dental porcelains