Ph.D. thesis at the institute of laser addresses the problems of root changes in the teeth
At the institute of laser for postgraduate studies, university of Baghdad, a public discussion of Ph.D. thesis in laser – dental medicine submitted by the student Tamara Sardar entitled “temperature, permeability and surface drainage as root changes of ivory salts made by dual wavelength (2780 nm, 940NM) laser”. The researcher stated that the aim of her research is to study the capability of dual wavelength laser (2780 nm Er, Cr: YSGG laser and 940 nm Diode Laser) in the treatment of root fillings by laser through studying the high temperature of surface and below, estimation of surface changes happening in root’s Ivory, degree of Ivory permeability after irradiation by dual wavelength laser. On the practical side, the researcher chose one hundred and eighty seven human teeth free of decay and with single root fillings taken off newly from patients of (18-35) years, including a sample of (25 for the experimental study, 75 for measurement of temperature, 75 to study permeability and 12 to be examined by electronic microscope “scanner”). This study is using laser of a dual which is something new that sends (2780 nm Er, Cr: YSGG laser and 940 nm Diode Laser) in one time. The researcher asserted that both lasers are working in a pulsed way by (RFT) with the use of environmental scanner to verify the morphological changes in root tooth’ ivory. Depending on the experimental results of temperature, samples have been divided into five groups of different irradiation protocols to test permeability and the precise morphological tests by adding a regulatory non-irradiated sample for attaining the accuracy of the experiment. During the estimation of temperature, three thermocouples of the type (K) were put below the surface of the zygomatic side and three ones on the surface of the tongue side at the cervical, medium and the apical parts of the root. The researcher showed that the statistical analysis of the results of temperature measurement showed that the rate of temperature for the groups (D and E) rose and reached to (9.946 and 9.968) celsius degrees respectively. There was no significant difference between the groups (A, B and C) while there is a big difference between the two groups (D and E) with all other groups. Concerning permeability, there was a significant difference between the groups (C and D) and all the other groups whereas the group (C) showed somewhat a total evaporation of the smear layer with maintaining the annular structure of ivory tubules. The researcher concluded that the root’ ivory irradiated with laser of dual wavelength by using the protocol of group (C) is an alternative promising method in the treatment of root canals by laser. The discussion committee consisted of prof. Dr. Abdul Hadi matshar Abdul, Ph.D.in laser physics from the institute of laser for postgraduate studies at the university of Baghdad as chairman, prof. Dr. Hussain Faisal al-Hoizi, Ph.D. in dentistry from the faculty of dentistry at the university of Baghdad as a member, assistant professor Dr. Ali Shukur Mahmoud, Ph.D. in general surgery and laser surgery from the institute of laser for postgraduate studies at the university of Baghdad as a member, assistant professor Dr. Abbas Faisal al-Hoizi, Ph.D. in dentistry from the faculty of dentistry at the university of Kufa as a member, assistant professor Dr. Manhal Abdul Rahman Majid, Ph.D. in dentistry from the faculty of dentistry at the university of Baghdad as a member and assistant professor Dr. Hussein Ali Jawad, Ph.D. laser physics from the institute of laser for postgraduate studies as supervisor. The thesis was evaluated by assistant professor Dr. Abdullah Mohammed Wajih from the faculty of dentistry at the university of Baghdad.