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Evaluation of shear bond strength between thermosens as relining material and different denture base materials

Author: Ghazwan Adnan Alkinani غزوان عدنان الكناني
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2014 Volume: 26 Issue: 4 Pages: 28-31
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Denture relining is the process of resurfacing of the tissue side of the ill fitting denture, the bond strengthat the relining-denture base interface is most important for denture durability.The aim of present study was toevaluate the shear bond strength between the thermosens as relining material and different denture base materialsthat bonded by thermo fusing liquid. As this corrective procedureis the common chair side procedure in the dentalclinic.Material and method: Sixty samples were prepared and divided into three main groups according to the type ofdenture base materials.Group (A) referred to the heat cure acrylic samples which consisted of 20 samples. Group (B)referred to the high impact acrylic samples which consisted of 20 samples. Group (C) referred to the thermosenssamples which consisted of 20 samples. All groups then subdivided into two groups; each one consists of 10 samples,according to the surface roughness: (A1, B1and C1 for groups with surface roughness and A2, B2 and C2for groupswithout surface roughness). Each sample consisted of two similar parts represent the denture base material eachpart of the sample was designed with dimensions of (70mm X 12mm X 5mmlength, width and depth respectively)having a stopper of depth 3mm. One part of the sample was placed on the other in a manner thatleaving a spacebetween them of dimensions (12mm X 12mm X 3mm length, width and depth respectively) to sandwich the reliningmaterial.Results: The results showed that the thermosens samples had the highest value of shear bond strength followed bythe high impact acrylic samples, then heat cure acrylic samples which had the lowest value of shear bond strength.The results of present study showed that rough samples had reducedshear bondstrength in comparison with thesmooth samples of the same denture base material

خلفیة : تبطین طقم الأسنان ھي عملیة اضافة طبقةالى سطح الطقم المواجھ لانسجة الفم الساندة للطقم ، ان قوة الالتصاقبینمادة التبطین و مادة قاعدة الطقم ھي الأكثر أھمیة بالنسبةلمتانةالطقم. الھدف من الدراسة الحالیة ھو تقییم قوة الالتصاق بین مادة الثیرموسینس كمادة تبطین و مواد قاعدة طقم مختلةتم لصقھا بواسطة سائل الثیرمو فیوشن. و ھذه العملیة التصحیحیةھي من العلاجات الشائعة في عیادة الأسنان .تشیر الى عینات الاكریلیك المعالج بالحرارة التي تتكون ( A ) المواد و طریقة العمل: تم إعداد ستین عینة و تنقسم إلى ثلاث مجموعات رئیسیة وفقا لنوع مواد قاعدةالطقم . المجموعةتشیر إلى عینات الثیرموسینس التي تتكون من 20 عینة . جمیع ( C ) تشیر إلى عینات الاكریلیك عالیة التاثیر التي تتكون من 20 عینة . المجموعة ( B ) من 20 عینة . المجموعة،A تشیر الى مجموعات العینات ذات الاسطح الخشنة و ( 2 (B1 ,C1 ،A المجموعات تم تقسیمھا إلى مجموعتین ؛ تتكون كل مجموعة من 10 عینات ، وفقا لخشونة سطح العینة: ( 15مم X 12 مم X تشیر الى مجموعات العینات ذات الاسطح الصقیلة. تتكون كل عینة من جزأین متماثلین تمثل مادة قاعدة الطقم تم تصمیم كل جزء من العینة مع أبعاد ( 70 مم (C2, B2X 12 مم X طول وعرض وارتفاع على التوالي)مع وجود عتبة من ارتفاع 3مم . یوضع جزء واحد من العینة على الآخر بطریقة تترك مسافة بینھما لتملئ بمادة التبطینبالأبعاد ( 12 مم3مم طول وعرضوارتفاع على التوالي).النتائج: أظھرت النتائج أن عینات الثیرموسینس كانت أعلى قیمة لقوة الالتصاق تلیھا عینات الاكریلیك عالیة التأثیر، ثم عینات الاكریلیك المعالج بالحرارة التي كانت أقل قیمة من قوةالالتصاق. وأظھرت نتائج الدراسة أن قوة الالتصاق قلت فیالعینات ذات الاسطح الخشنة بالمقارنة مع العینات ذات الاسطح الصقیلة من نفس مادة قاعدة الطقم .مفتاح الكلمات:الثیرموسینس وسائل الثیرموفیوشن و قوة الالتصاق.


Article
The Effects of Different Investment Materials on Dimensional Accuracy and Surface Roughness of Thermosens Maxillary Complete Dentures

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Abstract

Background: Limited data are available on the dimensional stability and surface roughness of ThermoSens, which is a material used in denture processing. This study aimed to measure the vertical teeth changes and surface roughness of ThermoSens dentures prepared using three different investment materials.Materials and methods: For the dimensional changes test, 30 complete maxillary dentures were prepared using different investment methods: group I, dental stone; group II, silicone putty; and group III, a mixture of dental stone and plaster (ratio, 1:1; n = 10 for each group). Four screws were attached to the dentures: two were attached to the buccal surface of the canine and first molar, and the other two were attached in the flange areas of the canine and first molar in line with the previously mentioned screws. Measurements were made using a micrometer microscope in the wax stage before flasking and in the deflasking stage. The above investment techniques were also used to prepare samples for a surface roughness test (n = 10 per group). These samples were prepared according to the specifications of the American Dental Association. Data were examined using analysis of variance (ANOVA) and the least significant difference (LSD) test.Results: One-way ANOVA and LSD revealed that dimensional changes significantly differed among all groups, except that the vertical teeth changes on the left side did not differ between groups I and II for both the canine and molar regions. Surface roughness was significantly higher in group I than in group II, and in group III than in group II.Conclusion: The use of putty silicone for investing ThermoSens complete dentures reduced dimensional changes and resulted in dentures with a better fit. Surface roughness could be reduced by the addition of a putty silicone layer over the denture before the addition of the second investment layer during denture processing

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