Results 21 to 30 of about 1,497,536 (354)

A Literature Review of Stainless Steel Crown for Permanent Molars: Indications, Survival, Periodontal and Radiographic Findings [PDF]

Journal of Dentistry
Stainless steel crowns (SSCs) are the preferred choice for restoring primary molars with extensive caries. However, they may be indicated for permanent molars in certain cases as well.
Pooya Vatankhah, Fatemeh Hashemi, Alireza Sarraf Shirazi   +2 more
doaj   +1 more source

Dental caries in primary and permanent teeth in children’s worldwide, 1995 to 2019: a systematic review and meta-analysis

Head & Face Medicine, 2020
Background Early childhood caries (ECC) is a type of dental caries in the teeth of infants and children that is represented as one of the most prevalent dental problems in this period. Various studies have reported different types of prevalence of dental
Mohsen Kazeminia, A. Abdi, S. Shohaimi, R. Jalali, Aliakbar Vaisi-Raygani, N. Salari, M. Mohammadi   +6 more
semanticscholar   +1 more source

Boolean Functions and Permanents of Sylvester Hadamard Matrices

Mathematics, 2021
One of the fastest known general techniques for computing permanents is Ryser’s formula. On this note, we show that this formula over Sylvester Hadamard matrices of order 2m, Hm, can be carried out by enumerating m-variable Boolean functions with an ...
José Andrés Armario
doaj   +1 more source

Mapping of proximal enamel thickness in permanent teeth

Brazilian Journal of Oral Sciences, 2015
Aim: Knowledge of enamel thickness is relevant to perform stripping during orthodontic treatment. Thus, proximal enamel measurements of human permanent teeth were compared in this study.
Flávio Vellini Ferreira, Flávio Augusto Cotrim Ferreira, José Alaor Ribeiro, Rívea Inês Ferreira Santos   +3 more
doaj   +1 more source

Effects of some Peruvian non-distilled alcoholic beverages on dental erosion

Journal of Oral Research, 2021
Objective: To determine the erosive effect of pieces of permanent teeth exposed to non-distilled alcoholic beverages. Material and Methods: This study takes a quantitative approach, with an explanatory scope, descriptive and correlational, with a pure ...
Monica Quispe-Zuta, Franz Coronel-Zubiate, Henry Zelada-Romero, Carlos Farje-Gallardo, Tania Castillo-Cornock, Paola La Serna-Solari, Heber Arbildo-Vega   +6 more
doaj   +1 more source

The Dittert's function on a set of nonnegative matrices

International Journal of Mathematics and Mathematical Sciences, 1990
Let Kn denote the set of all n×n nonnegative matrices with entry sum n. For X∈Kn with row sum vector (r1,…,rn), column sum vector (c1,…,cn), Let ϕ(X)=∏iri+∏jcj−perX. Dittert's conjecture asserts that ϕ(X)≤2−n!/nn for all X∈Kn with equality iff X=[1/n]n×n.
Suk Geun Hwang, Mun-Gu Sohn, Si-Ju Kim
doaj   +1 more source

Bipartite Graphs Associated with Pell, Mersenne and Perrin Numbers

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2019
In this paper, we consider the relationships between the numbers of perfect matchings (1-factors) of bipartite graphs and Pell, Mersenne and Perrin Numbers.
Öteleş Ahmet
doaj   +1 more source

Caries and premature loss of the first permanent molar in grade school children, and parents’ knowledge level, in Vargas state, Venezuela

Journal of Oral Research, 2019
Introduction: The first permanent molars are the most affected due to age of eruption and their anatomical characteristics. Objective: to determine the prevalence of caries and premature loss of the first permanent molar in a group of grade school ...
Mariana Morales-Chávez, Yornelly Mendoza-Hernández   +1 more
doaj   +1 more source

Analysis of temperature characteristics of power transformer withstand short circuit shock for two seconds

Energy Reports, 2023
The occurrence of a short-circuit fault in a transformer results in a rapid increase in the short-circuit current, and the temperature of the transformer winding rises rapidly.
Junyang Wang, Yan Li, Peng Li, Xiongbo Wang, Zhanyang Yu, Tiannan Meng   +5 more
doaj   +1 more source

Research on distribution of winding leakage magnetic field of three-phase dry type transformer under short-circuit condition

Energy Reports, 2023
Leakage flux magnitude and pattern greatly affect transformer short-circuit resistance. In this paper, finite element calculations and experimental measurements is used to calculate the leakage magnetic field of a transformer.
Tiannan Meng, Yan Li, Peng Li, Xiongbo Wang, Bingbing Hou, Zhanyang Yu   +5 more
doaj   +1 more source