Damage of high-strength bolt (DHSB) is inevitable during long-term use. Such damage irreversible that may not be replaced in time, and the potential danger proven by changes mechanical properties DHSB. To investigate DHSB, this paper uses software ABAQUS to simulate stress various types DHSB under earthquake, compares with undamaged bolts (UDHSB). The results show most unfavorable position crac...

Ectopic eruption is the abnormal eruption of a permanent tooth that often causes root resorption of an adjacent primary tooth which can be noted during routine dental radiographic evaluation. The mesial eruption of the permanent first molar may be a local eruption problem or may indicate developmental arch circumference deficiency requiring further consideration. Early treatment is mandatory to...

OBJECTIVES The purpose of this study was to evaluate the performance of both single and double applications of (Adper Prompt L-Pop) self-etching dental adhesive, when used with three classes of light-activated restorative materials, in comparison to the performance of each restorative system adhesive. Evaluation parameters to be considered for the adhesive systems were (a) immediate marginal ad...

In 2001 AGMA introduced the first of two documents: ANSI/AGMA 2015–1–A01: Accuracy Classification System—Tangential Measurements for Cylindrical Gears, followed in 2006 by the release of ANSI/AGMA 2015–2– A06: Accuracy Classification System—Radial System for Cylindrical Gears. Both of these documents, when combined, officially replace the still widely used standard, AGMA 2000–A88: Gear Classifi...

Single rooted tooth are considered to be the easiest for root canal treatment. The literature has documented cases with single rooted tooth showing more than single canal. Understanding of root canal morphology thus is an important aspect to be considered for successful endodontic treatment. The case presented here shows a rare entity of having double canals in all the mandibular incisors in a ...

The problem of internal forces that occur on the cycloid disc during speed reducer operation so far has not been considered in a way reflects its actual workloads and stresses itself. This paper presents dynamic analysis stress-strain state by using experimental numerical methods. following cases meshing are presented paper: single-tooth, double-tooth, triple-tooth ring gear. was chosen for thi...

o bjectives: one major drawback of orthodontic treatment is its long duration due to slow tooth movement and the pain at the onset of treatment following application of forces. there is controversy regarding the efficacy of laser for decreasing the treatment time and pain of orthodontic treatment. the purpose of this study was to investigate the effect of low level diode laser on the rate of or...

Connated teeth are the consequences of developmental anomalies leading to the eruption of joined elements. Fusion and gemination are terms frequently used to describe the clinical presentation of connated teeth. The terms ‘double teeth’, ‘double formations’, ‘joined teeth’, ‘fused teeth’ or ‘dental twinning’ are often used to describe fusion or gemination, both of which are primary developmenta...