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Register a new userInfluence of stone cast type On the fit of complete denture base
تأثير نمط جبس المثال النهائي في انطباق قواعد الأجهزة الكاملة المتحركة
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Damascus University ورقة بحثية
Publication date
2011
fields
Dentistry
and research's language is
العربية
Created by
Shamra Editor
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يؤدي انطباق الأجهزة الكاملة دوراً كبيراً في ثباتها، و قد عدت مادة الميتيل ميتاكريلات الفضلى من بين المواد لصناعة قواعد الأجهزة المتحركة، لكنها تتعرض لتغيرات في الأبعاد و تقّلص حجمي تؤثر في دّقة انطباق الأجهزة المصنوعة منها، و من ثَم ثباتها. هدفت هذه الدراسة إلى إجراء مقارنة مخبرية بين نمطين مختلفين من المنتجات الجبسية المستخدمة في صب الأمثلة النهائية من حيث تأثيرها في دّقة انطباق قواعد الأجهزة الكاملة المتحركة، و ذلك باستخدام الرقاقات المطاطية.
Adapting of the complete denture will ensure its retention. Poly(methyl methacrylate) is considered to be the best material to manufacture denture bases. However it incurs changes in dimension and volumetric contraction which affects the adaption of dentures and therefore the retention. The purpose of this study was to compare two types of stone casts in their effect on accuracy of fit of complete denture base.
References used
Kim Y, Michalakis KX, Hirayama H. Effect of relining method on dimensional accuracy of posterior palatal seal. An in vitro study. J Prosthodont. 2008;17:211-8
The glossary of prosthodontic terms. J Prosthet Dent. 2005;94:10-92
Lee CJ, Bok SB, Bae JY, Lee HH. Comparative adaptation accuracy of acrylic denture bases evaluated by two different methods. Dent Mater J. 2010;29:411-7
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Background& Objective: Prosthodontists always do their best in order to make dentures that fulfill all the functional and esthetic requirements of the patients. The purpose of this study is to evaluate the relationship between patients’ satisfaction
with traditional complete dentures and clinical measures of denture quality, which include clinical assessment of retention, stability, support, occlusion, esthetics and speech.
Materials & Methods: 104 patients participated in our study (65 males, 39 females). The range of their ages was (40 – 78) years (median=60.9). Traditional complete dentures were made for all these patients, and then they were followed for 4-6 weeks. After that, a questionnaire was filled for each patient. This questionnaire includes questions about patient satisfaction and assessment of the new denture. The clinical measures of quality of the denture were also assessed by a prosthodontist.
Results: The results of this study showed that there was a poor significant relationship between patients’ rating of the retention of their dentures and the clinical measures of retention, stabililty and support (r<0.04). At each of the surveyed situations, the patient considered their dentures better than the examiner
did (P<0.05). There was also a poor, significant relationship between the accuracy of reproduction of
centric relation and the patient ability to masticate with his denture(r=0.27).
Conclusion: Within the limits of this study, it can be concluded that clinical measures of denture quality
affect the retention of the denture as perceived by the patient. They also affect the comfort of the patient during mastication. For that, the dentist must always do his best to make dentures with enhanced quality.
On the other hand, clinical measures of quality are not the only factor that affects the patient satisfaction with denture.
Most of prosthodontists know that patient satisfaction is not based only on the
technical quality of the dentures. For that, our study aimed to investigate the influence of some clinical
factors on patients’ satisfaction with conventional complete
dentures. These factors include: patients’
gender and age, smoking, musculature of jaws and cheeks, resorption of mandibular or maxillary residual
ridge, the existence of hypermobile tissues, and previous denture wearing experience.
Discoloration of acrylic resin denture base when it comes in contact with various foods materials and beverages in the oral cavity may cause aesthetic concern to a denture wearer.
The objective of this study was to know the influence of soft
denture liners on raising the masticatory
efficiency when it is added to base of complete dentures
This study included ٢٥ patients ٣ groups .
When patients used complete dentures with
soft denture liner,
masticatory efficiency increased by ١١,٢٥٪ , there was gradual
healing (recovery ) of mucous membrane, and the patients
needed shorter time (٦-١٠ days) to accept their complete
dentures .
This paper aims at studying the influence of gangue aiid researching in the
theoretical empirical methods in order to limit the formation of such gangue
during the manufacture of steel. Gangues are divided to acids, sulfate and
compound gangue. Su
ch gangues are known for their bad influence on the
mechanical characteristics of steel. Experiments have proved that the
influence of Sulfur gangue especially FeS is worse than that of acids, as the
melting point is 880t. Such gangue form capillary ducts within steel, thus
there will be internal micro cleaves and stress points that will lead to
collapse and break when the metal is exposed to stress less than the flowing
point which is considered within the allowed stress values.
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