Methods After cavity preparation with superpulsed CO 2 laser the reaction of pulp tissue and cavity form were examined by light microscopy and scanning electron microscopy.

Methods After 24 hours cavity preparation with Er,Cr:YSGG in the teeth of experimental Chinese minipigs,the reaction of pulp tissue and cavity form were examined by light microscopy and scanning electron microscopy.

Methods The occlusal surface of the right first and second maxillary molars in 15 dogs were unilaterally raised 1.5mm with the casting Ni Cr inlays which were fixed in Class I hole.

OBJECTIVE: The purpose of this study was a 4-year clinical evaluation of a hybrid posterior resin composite (CLEARFIL AP-X/SE BOND) in filling for posterior teeth with modified USPHS&Ryge evaluation criterion.

Choosing displacement deviation of the characteristic points at cavern perimeter as objective function, controlling sizes of geometric shape of the cavern as design variables, some optimization of cavern shape are proposed.

METHODS:Six kinds of Class tunnel restorations of the first mandibular molar were prepared,the ridge thickness were 1.5,2.0 or 2.5 mm,the lateral cavity of the molar was oval or round in shape.

Methods The occlusal surface of the right first and second maxillary molars in 18 dogs were unilaterally raised 1.5 mm with the casting Ni-Cr inlay which were fixed in Class I inlay hole.

No negative effects of enlarged area, diameter, or tunnel shape on clinical results were found in our study.

Factors, including the effects of anisotropy in the initial stress state and the tunnel shape on the plastic zone around an excavated tunnel have been examined.

Although there was much variation within species, certain interspecific differences in tunnel shape appeared.

Features of the hole shape formation during laser drilling of an ultrafine-grained aluminum alloy

Complex variable function method fob hole shape optimization in an elastic plane

In this paper, a complex variable function method for solving the hole shape optimization problem in an elastic plane is presented.

Numerical results are given for typical examples, both for a circular hole and with the hole shape included in the optimization.

For wavelengths at which both traps absorb, the hole shape is clearly a composite of two Lorentzians, corresponding to hole-burning in both states simultaneously.

The finite element method is used in this paper to determine the initial earth stress by displacements in surrounding rock around an excavation, including the linear elastic and elasto-plastic problem. Not only the calculation theorem and formulae, but also the flow chart for nonlinear plane strain problem and example of verification are in it, which can be used in practice.The main features of this method are as follows:1. One can use in calculation the displacement information that can be got easily through...

The finite element method is used in this paper to determine the initial earth stress by displacements in surrounding rock around an excavation, including the linear elastic and elasto-plastic problem. Not only the calculation theorem and formulae, but also the flow chart for nonlinear plane strain problem and example of verification are in it, which can be used in practice.The main features of this method are as follows:1. One can use in calculation the displacement information that can be got easily through in-situ measurements;2. It can be used for any shape excavation and at any excavating stage;3. It can eliminate the effects of spacial action induced by excavation;4. It can determine the initial tectonic stress independently (namely, not with the gravitational stress), because of which one can determine the initial earth stress distribution more accurately.In addition, this method has also considered the way that can enhance the calculation accuracy by using the statistics theorem.

This article analysis the forward effect of the infected root canal and the pathological changes of the root apex of 115 cases with 112 successes which account for 97.3 percent and 3 unchanged. The auther suggests a new design for opening a hole to the pulp chamber, whteh can cut less tissue, treat the root canal more easily, strengthen the resistance form, prevent tooth fracture and keep the tooth in better condition. Besides, problems concerned have been discussed here with the authors experience from practice....

This article analysis the forward effect of the infected root canal and the pathological changes of the root apex of 115 cases with 112 successes which account for 97.3 percent and 3 unchanged. The auther suggests a new design for opening a hole to the pulp chamber, whteh can cut less tissue, treat the root canal more easily, strengthen the resistance form, prevent tooth fracture and keep the tooth in better condition. Besides, problems concerned have been discussed here with the authors experience from practice.

For the class Ⅱ cavity restored with amalgam,stress analysis was done by finite element method. Based of the analytic results,an improved cavity has been designed,and its stress distribution has been worked out.The analysis showed that the improved cavity was characterized by lessening wear of healthy tooth and lowering stresses.It was superior to the traditional cavity in both retention and resis- tance.The work provides a theoratical basis for clinical application.