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Comparison of the resin cement bond strength to an indirect composites treated by Er YAG laser and sandblast
Mansure Mirzaee, Esmaeel Yassini, Sima Shahabi, Nasim Chiniforoush, Naznin Zeinab Garshasbzade,
Volume 27, Issue 1 (4-2014)
Abstract

  Background and Aims: Indirect composites are designed to overcome the shortcomings of direct composites such as polymerization shrinkage and low degree of conversion. But, good adhesion of resin cements to indirect composites is still difficult. This research was designed to assess the effect of different powers of ErYAG laser compared with sandblasting. On the micro tensil bond strength of resin cement to indirect composites.

  Materials and Methods: Specimens were prepred using dental resin composite (Gradia GC) and metallic mold (15×5×5 mm) and were cured according to the manufacturer’s instructions. 24 blocks were prepared and randomly divided into 12 groups. G1:no treatment (as control), G 2-6: Er YAG laser irradiation (2, 3, 4, 5, 6 Watt), G7: sandblast. Two composite blocks were bonded to each other with Panavia F.2. resin cement. The cylindrical sections with dimensions of 1 mm were tested in a microtensile bond strength tester device using 0.5 mm/min speed until fracture points. Data were analyzed using 2-way ANOVA and T-test.

  Results: Interaction between lasers irradiation and sandblast treatments were significant (P<0.05). Thus, T-test was used for comparing laser groups. T-test showed that when using laser with energies less than 150 mJ, there was no significant difference (P>0.05) whether samples were sandblasted or not. Samples which received 300 mJ of laser showed lower bond strength compared with no laser treatment. Other groups showed no significant difference (P>0.05).

  Conclusion: It seems that application of sandblast with proper variables, is a good way to improve bond strength.
Laser application had no influence in improving the bond strength between the indirect composite and resin cement.


Oral health of elderly people in Yazd city and its relationship with quality of life
Sahar Balanian, Masood Mirzaee, Sara Jambarsang, Seyyed Abass Sadat Hosseini,
Volume 32, Issue 3 (11-2019)
Abstract
Background and Aims: Regarding the high prevalence of caries and oral dental diseases, especially in the elderly, and the increasing attention of people to using the concept of quality of life, this study was conducted to determine the relation between oral and dental health and the quality of life in elderly people in Yazd.
Materials and Methods: This cross-sectional study was performed using data from the Yazd Public Health Survey (YAHS) with a sample of 9293 people, in 1393-94. All information was collected from 1907 elderly people aged between 60 to 70 years, including quality of life and oral and dental indexes from the comprehensive questionnaire of YAHS. Data were analyzed by independent t-test and Spearman correlation coefficient using SPSS16 software.
Results: There was a significant relationship between the quality of life and oral hygiene (P<0.01). Also, the score of quality of life and oral health was significantly related to education (P<0.01).
Conclusion: This study showed the positive relation between the oral health the quality of life. In addition, there was a quality of life level in the elderly people with poor oral hygiene.

Evaluation of oral health and malocclusion among blind children and teenagers in Mazandaran in 2019
Pedram Abedi, Maysam Mirzaee, Sahba Amini, Mohammad Mehdi Naghibi Sistani,
Volume 33, Issue 4 (1-2021)
Abstract
Background and Aims: Information collection about the malocclusion and oral health in blind children is essential to plan for their education in schools. Therefore, this study aimed to evaluate the status of malocclusion and oral health among blind children and teenagers in Mazandaran, Iran.
Materials and Methods: The population of this included 150 blind children and teenagers aged from 10 to 18 years who were referred to the public and private centers cities including Sari, Babol, Freydoonkenar, and Babolsar in Mazandaran, Iran in 2019. Information on maxillary occlusion status, oral hygiene index, and DMFT index was extracted through clinical examination. Data were analyzed using SPSS23 software by ANOVA and Chi-square tests in addition to the descriptive statistics.
Results: The mean DMFT was 10.25 (SD 4.67). Oral hygiene status was good in 16% of participants, moderate in 82%, and poor in 2%. There was no significant difference between girls and boys in terms of oral hygiene status (P=0.5). In all cases, 35.8% had class I malocclusion, 29.8% had class II malocclusion, and 14.6% had class III malocclusion. Class II malocclusion was more common in girls and class I in boys (P=0.01).
Conclusion: Dental caries and occlusal abnormalities were common among blind children and adolescents living in Mazandaran province. Addressing the oral and dental needs of the blind should be a priority for health policymakers in this province in Iran.

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