Classic Reviews from Past Comprehensive Review Courses in Prosthodontics

https://deepblue.lib.umich.edu/bitstream/2027.42/154049/1/classic_reviews-vol1.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/154049/2/classic_reviews-vol2.pdfDescription of classic_reviews-vol1.pdf : Volume 1Description of classic_reviews-vol2.pdf : Volume

Evaluation of the Prevalence and Clinical Characteristics of Intrapulpal Cracks Utilizing a Novel Classification System

Few studies have investigated cracks involving the pulp chamber walls or floor. The purpose of this study was to create a classification system for intrapulpal cracks and analyze associated clinical characteristics. Retrospective analysis included 52 teeth confirmed to have an intrapulpal crack. The classification system describes the crack based upon its location within the pulpal walls and floor. Documentation consisted of demographic, subjective and objective examination data. Chi-squared analysis tested associations with the intrapulpal crack classifications. Ninety-two percent of intrapulpal cracks run M-D, 75% involve one pulp chamber wall, and 84% terminate at the floor-wall junction or extend into an orifice without involving the pulpal floor. There was a statistically significant (P\u3c0.05) relationship between the location of the intrapulpal crack and tooth type as well as between the classification system and bite test and transillumination. The classification system was adaptable to clinical practice and provides insight into these challenging situations

An In vitro study to compare the dentinal defects caused during Root Canal Preparation with Hand File and Two Different Ni-Ti Rotary File Systems

AIM OF THE STUDY: The aim of the present study was to compare the dentinal defects caused during root canal preparation with hand file and two different Ni-Ti rotary file systems. MATERIALS AND METHODS: The study samples comprised of sixty extracted intact, non carious human mandibular premolars which were randomly divided into 4 Groups. Each Group consists of 15 specimens. Teeth of the experimental Groups were decoronated and standardized to the root length of 12mm. Group 1: Control Group with unprepared root canal. Group 2: Root canal preparation done by hand K files [Step back method]. Group 3: Root canal preparation done by rotary Mtwo files [Crown down method]. Group 4: Root canal preparation done by rotary K3XF files [Crown down method]. During root canal preparation of all specimens of the experimental Groups, 5% sodium hypochlorite was used as an irrigating solution and 17% EDTA gel was used as a lubricant and final rinsing done with normal saline then with distilled water . All specimens were stored in the distilled water until further sectioning procedures. Horizontal sectioning was done with the hard tissue microtome under water cooling at 3mm and 6mm levels from the root apex Each section was evaluated for dentinal defects under the Stereomicroscope of 45X magnification. RESULTS: Group 1 had lesser number of dentinal defects followed by Group 2, 3 and 4. Group 3 and Group 4 had more number of Fracture type of dentinal defects . CONCLUSION: Hand K files induced minimal dentinal defects when compared to rotary files. Among the rotary files Mtwo files induced minimal dentinal defects when compared to K3XF files

Clinic, diagnosis, treatment, prevention, prosthetics various dentofacial anomalies and deformities

Orthodontics- section of dentistry, has been studying the etiology and pathogenesis of dentoalveolar anomalies, improvement of methods of diagnosis, the development of methods of prevention and elimination of anomalies of the teeth, the form of the dental arches, malocclusion, managing the growth of the jaws, the normalization function of dental system, the elimination of aesthetic disorders, the study of the influence of dentition abnormalities in the development of related organs and body as a whole. The problem of providing orthodontic care for children, adolescents and adults remains relevant because of dentoalveolar anomalies have considerable spread. Currently, there has been five major areas of development: 1) Preventive Orthodontics; 2) Specialized treatment of children in orthodontic offices or classrooms; 3)Orthodontic treatment of adults; 4) Orthodontic treatment and tooth-jaw denture patients with congenital clefts in the maxillofacial region in the system of complex treatment; 5) Orthodontic treatment as the preliminary and final stages after surgical removal of tooth-jawfacial anomalies. Toolkit is designed for students of 3-5 courses of the international faculty

Development, Evolution, and Teeth: How We Came to Explain The Morphological Evolution of the Mammalian Dentition

abstract: This dissertation begins to lay out a small slice of the history of morphological research, and how it has changed, from the late 19th through the close of the 20th century. Investigators using different methods, addressing different questions, holding different assumptions, and coming from different research fields have pursued morphological research programs, i.e. research programs that explore the process of changing form. Subsequently, the way in which investigators have pursued and understood morphology has witnessed significant changes from the 19th century to modern day research. In order to trace this shifting history of morphology, I have selected a particular organ, teeth, and traced a tendril of research on the dentition beginning in the late 19th century and ending at the year 2000. But even focusing on teeth would be impossible; the scope of research on this organ is far too vast. Instead, I narrow this dissertation to investigation of research on a particular problem: explaining mammalian tooth morphology. How researchers have investigated mammalian tooth morphology and what counts as an explanation changed dramatically during this period.Dissertation/ThesisDoctoral Dissertation Biology 201

Дистрибуција на оклузални вертикални сили кај мостовна конструкција со два носачи и дистално продолжен член

Дистрибуција на оклузални вертикални сили на забите кај дистално продолжената мостовна конструкција е различна од дистрибуцијата на класичната мостовна конструкција. Во трудот анализирана е дистрибуција на оклузални вертикални сили кај мостовна конструкција со три оклузални единици, кај малку скратен забен низ. Анализата беше направена со примена на метод на конечни елементи (МKЕ). Оптоварувањето е на сите членови на мостовната конструкција со сили од 0.5-512N. Резултатите покажуваат дека вредностите на дистрибуираните сили се во границите на познатите вредности на сили за премолари. Меѓутоа постoи нерамномерна дистрибуција на сили на двата заби носачи. Најголема сила се дистрибуира на дисталниот заб носач. Поместувањата се во границите на нормалните вредности за поместување на забите

The Feasibility Of Using Infra-Red Radiation In Determining Tooth-Vitality

The aim of this Study was to investigate the feasibility of infra-red radiation determining human tooth-vitality, the basis being that a vital tooth with an internal blood-supply may emit more infra-red radiation and be warmer than a non-vital tooth. The commonest pulp tests are sensibility tests which assess the ability of the nerve fibres within the pulp to respond to a stimulus applied to the tooth, rather than assess the pulp blood-flow. Development of the vitality test involved cooling the tooth-tissues and capturing the emitted infra-red radiation of re-warming with a thermal camera. Cooling and re-warming of tooth-slices enabled calculation of thermal conductivity and thermal diffusivity of the mineralised tissues - enamel and dentine - and production of a thermal map which characterised these. Sixteen extracted human molar teeth were tested in a cross-over-study with simulated vitality at four flow-rates: 0.5ml/min, 0.15ml/min, 0.08ml/min and 0.03ml/min under two conditions: pulsed and non-pulsed. The cross-over-design allowed paired testing of the same tooth and independent testing of two dissimilar teeth. The area under the re-warming curve between vital and non-vital teeth was statistically tested. Statistical significance was shown between the paired vital and non-vital teeth at all pulsed flow-rates, and non-pulsed flow-rates of 0.15ml/min and 0.5ml/min. Only the pulsed flow-rate of 0.5ml/min was significant for dissimilar teeth. A thermal map demonstrated re-warming of the vital tooth before the non-vital tooth. The results suggest infra-red radiation may determine tooth-vitality when the teeth are of the same size and shape, with a blood-flow of 0.03ml/min or above. This could be a realistic blood-flow for the human tooth. Testing teeth of differing size and shape may determine vitality at a blood-flow of 0.5ml/min - higher than realistically expected in the human tooth. Clinically, the vitality test between a vital and non-vital root-treated tooth points to this model being inverted. This may be due to the insulating nature of the materials used to restore the non-vital tooth. Further clinical investigation is justified to validate the vitality test