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Damascus University رسالة ماجستير
Publication date
2015
fields
Dentistry
and research's language is
العربية
Created by
Shamra Editor
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إن اسمى تعبير حقيقي عن مشاعر الانسان العفوية هي تلك الابتسامة فإذا كانت الابتسامة جميلة فإنها تحقق غايتها في الاتصال والتواصل ومن هنا كانت المحافظة على جمال هذه الابتسامة ضرورة ملحة تستدعي بذلك الكثير من الجهد والتعب
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References used
Levin El. Dental esthetics and the golden proportion J Prosthet Dent. 1978
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إن الحاجة الماسة إلى تجميل الأسنان الأمامية أدت إلى تنوع الطرق والمواد والأدوات وتنافسها في مجال تحقيق الناحية التجميلية الأفضل
These days compositedefinitly became at the top of direct cosmetic restorations, and
the most using restorative material, due to this development now it's used for direct
Veneers &Lumineers.
Because of the high sensitivity of its application, gene
ral practitioner should achieve
a dry, clear work field, especially gingival area.
The aim of the study was to use the modified metal matrix, which used in this study,
is to retract the gum, isolate the tooth from the exudation of the sulcus and bleeding gum
avoiding margin leakage, also provide acceptable continuance between the restoration
surface and the under gum tooth structure, to prevent forming reverse stage under gum.
120 teeth were included in this study, all teeth were treated using the modified metal
matrix, 10 teeth at least for each patient, with no orthodontic treatment. The results have
practically proved getting all goals; retracted gum, tooth isolated from exudation of the
sulcus and bleeding gum, also provided continuance between veneers and under gum tooth
structure, and not having reverse stage which is the main cause of gum inflammation,
beside time saving and easy direct veneer application.
The research project sample consisted of 80 extracted central incisors obtained from the Oral and Maxillofacial Surgery Department as well as from private practices. These teeth were divided into two equal groups. The bonding agent ClearFil SE Bond w
as used in one group, whereas the OptiBond Solo Plus bonding agent was used in the other group. Each group was divided into four subgroups: (1) veneers performed without any bleaching, (2) veneers performed two weeks before bleaching, (3) veneers performed immediately following bleaching and (4) veneers performed two weeks after bleaching.
veneers were made using a special template which allowed producing the same size of all the specimens used in this project. These veneers were placed on the vestibular surfaces of enamel of the extracted central incisors.
The aim of the previous procedures was to study the effect of home teeth bleaching .
Teeth were embedded in acrylic blocks created in metallic cylinders. The bonding strength was measured through .
The results showed that there was a significant difference between the control subgroup and the second subgroup .
We create a large-scale dialogue corpus that provides pragmatic paraphrases to advance technology for understanding the underlying intentions of users. While neural conversation models acquire the ability to generate fluent responses through training
on a dialogue corpus, previous corpora have mainly focused on the literal meanings of utterances. However, in reality, people do not always present their intentions directly. For example, if a person said to the operator of a reservation service I don't have enough budget.'', they, in fact, mean please find a cheaper option for me.'' Our corpus provides a total of 71,498 indirect--direct utterance pairs accompanied by a multi-turn dialogue history extracted from the MultiWoZ dataset. In addition, we propose three tasks to benchmark the ability of models to recognize and generate indirect and direct utterances. We also investigated the performance of state-of-the-art pre-trained models as baselines.
Ring-opening monomers with a reduced shrinkage stress “silorane" are being
used as matrix resins for recently introduced dental composites. Thisstudy aimed to analyzethe
mechanical behavior(Flexural StrengthFS, Abrasion Resistance AR) of the silora
ne-based composite
(Filtek P90) in comparison to two methacrylate-based composites (Tetric- Evo Ceram & packable
hybridTetric Ceram HB).
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