Magiran | جستجوی کلیدواژه "portland cement"

Effect of Incorporating Titanium Dioxide Nanoparticles into White Portland Cement, White Mineral Trioxide Aggregate, and Calcium Enriched Mixture Cement on the Push-out Bond Strength to Furcal Area Dentin

Shahriar Shahi, Mohammad Samiei, Mahmoud Bahari *, Hamidreza Yavari, Mona Rahbar Mahvarian

Journal of Dentistry, Shiraz University of Medical Sciences, Volume:24 Issue: 4, Dec 2023, PP 422 -428

Statement of the Problem:

Bond strength of furcation repair materials is an essential factor in clinical success. Studies on the effect of adding titanium dioxide (TiO2) nanoparticles on the push-out bond strength of commonly used endodontic cements for furcation perforation repair is limited.

Purpose

This study aimed to evaluate the effect of adding TiO2 nanoparticles to white Portland cement (PC), white mineral trioxide aggregate (MTA), and calcium enriched mixture cement (CEM) on their push-out bond strengths.

Materials and Method

In this in vitro study, 120 endodontically treated molars were assigned to six groups (n=20) based on the material used to repair the perforation. In three groups, the cements (white PC, white MTA, and CEM) were placed in pure form, and in the three remaining groups, 1 weight % of TiO2 was added. The push-out bond strength was measured using a universal testing machine at a strain rate of 0.5 mm/min. Data were analyzed using one-way ANOVA and post hoc Games-Howell test (p< 0.05).

Results

One-way ANOVA showed significant differences in the mean bond strength values between the six groups (p= 0.002). The post hoc Games-Howell test showed that the bond strengths in MTA+TiO2 and PC+TiO2 groups were significantly higher than those in MTA and PC groups, respectively. However, there was no significant difference in the bond strength between CEM and CEM+ TiO2 groups.

Conclusion

The incorporation of TiO2 into MTA and PC increased their push-out bond strength. However, it did not affect the push-out bond strength of CEM cement.

Keywords: Calcium-Enriched Mixture Cement, Mineral Trioxide Aggregate, Portland cement, Titanium dioxide

One-year outcomes of MTA and modified Portland cement pulpotpmy in primary teeth: a randomized clinical trial

Fatemeh Mazhari, Katayoun Safari, Fatemeh Mahmoudabadi *

Journal of Dental Materials and Techniques, Volume:6 Issue: 4, Autumn 2017, PP 147 -151

Purpose

To compare the efficacy of Mineral Trioxide Aggregate (MTA) and Modified Portland Cement (MPC) as pulpotomy medicaments in primary molars.

Methods

A sample of 54 children 4 to 6 years old of age, who had at least one primary mandibular second molar that needed pulpotomy were randomly placed in MTA (n = 28) or MPC (n = 26) groups. After completing the pulpotomy procedures, the teeth received a stainless-steel crown. Clinical and radiographic successes/failures were blindly evaluated at 6 and 12 months, and Fisher's exact test was used to analyze the differences.

Results

At 6- and 12-month follow-ups, MTA and MPC had 100% clinical success rate. Radiographic success rates of MTA were 92.9% at 6 months and 89.3% at 12 months. While the rate for MPC group was 88.5% at both intervals. There was no statistically significant difference between the two groups.

Conclusion

The results of this investigation showed that treatment success rate with MPC was comparable to MTA pulpotomy. However, additional clinical research that considers long-term follow-ups is required to test the usefulness of MPC in the pulpotomy treatment of primary teeth.

Keywords: portland cement, mineral trioxide aggregate, primary molars, pulpotomy

Physicochemical Properties of MTA and Portland Cement after Addition of Aloe Vera

Alvaro Henrique Borges, Orlando Aguirre Guedes, Luiz Evaristo Ricci Volpato, Gilberto Siebert Filho, Alexandre Meireles Borba, Omar Zina, Evandro Piva, Carlos Estrela

Iranian Endodontic Journal, Volume:12 Issue: 3, Summer 2017, PP 312 -317

Introduction

The aim of this in vitro study was to determine the liquid-powder ratio, setting time, solubility, dimensional change, pH, and radiopacity of white structural and non-structural Portland cement, ProRoot MTA and MTA Bio, associated with a 2% glycolic solution containing Aloe Vera, as vehicle.
Methods and Materials: Five samples of each material were used for each test, according to the American National Standards Institute/American Dental Association (ANSI/ADA) specification No. 57. Statistical analyses were performed using ANOVA and Tukeys test at 5% significance. When sample distribution was not normal, non-parametric analysis of variance and the Kruskal-Wallis test were used (α=0.05).

Results

No statistical differences were found in liquid-powder ratios among the tested materials. ProRoot MTA showed the longest setting time. Dimensional change values were acceptable in all groups. Also, no significant differences were found in pH values and pH was alkaline in all samples throughout the experiment. Mean radiopacity results obtained for white Portland cements did not meet ANSI/ADA requirements, and were significantly lower than those obtained for MTA-based cements. Finally, Portland cements showed significantly higher mean solubility values compared to the other samples.

Conclusion

The physicochemical properties of the tested materials in association with Aloe Vera were compatible with ANSI/ADA requirements, except for the white Portland cements, which failed to meet the radiopacity specification.

Keywords: Aloe Vera, MTA, Physicochemical Properties, Portland Cement

Biocompatibility of Portland Cement Modified with Titanium Oxide and Calcium Chloride in a Rat Model

Narjes Hoshyari, Hossein Labbaf, Nooshin Jalayer Naderi, Ali Kazemi, Farshid Bastami, Maryam Koopaei

Iranian Endodontic Journal, Volume:11 Issue: 2, Spring 2016, PP 124 -128

Introduction

The aim of the present study was to evaluate the biocompatibility of two modified formulations of Portland cement (PC) mixed with either titanium oxide or both titanium oxide and calcium chloride.
Methods and Materials: Polyethylene tubes were filled with modified PCs or Angelus MTA as the control; the tubes were then implanted in 28 Wistar rats subcutaneously. One tube was left empty as a negative control in each rat. Histologic samples were taken after 7, 15, 30 and 60 days. Sections were assessed histologically for inflammatory responses and presence of fibrous capsule and granulation tissue formation. Data were analyzed using the Fishers exact and Kruskal-Wallis tests.

Result

PC mixed with titanium oxide showed the highest mean scores of inflammation compared with others. There was no statistically significant difference in the mean inflammatory grades between all groups in each of the understudy time intervals.

Conclusion

The results showed favorable biocompatibility of these modified PC mixed with calcium chloride and titanium oxide.

Keywords: Biocompatibility, Mineral Trioxide Aggregate, Portland Cement

بررسی واکنش التهابی بافت همبند استخوان خرگوش به MTA سفید و سمان پرتلند

سمیرا شاه سیاه، حمد یزدی زاده، پژمان پوراکبر جهاندیده، منصور جعفرزاده، سحر جلالی، بهناز تولایی

مجله علمی پزشکی جندی شاپور، سال دوازدهم شماره 3 (پیاپی 84، امرداد و شهریور 1392)، صص 335 -344

زمینه و هدف

MTA سفید و سمان پرتلند دارای ساختار شیمیایی مشابه هستند. هدف از این تحقیق بررسی واکنش التهابی بافت استخوانی خرگوش نسبت به این دو ماده می باشد.

روش بررسی

در این مطالعه آزمایشگاهی 20 عدد خرگوش نر ایرانی یکساله به 5 گروه 4تایی تقسیم شده و در داخل استخوان تیبیای آنها مواد MTA سفید و سمان پرتلند کاشته شد. به این صورت که در بافت نرم 3 سوراخ با فاصله 2 سانتی متر و عمق و قطر 2 میلی متر ایجاد شد که در سوراخ اول و دوم مواد مذکور کاشته و سوراخ سوم به عنوان گروه کنترل در نظر گرفته شد. سپس نمونه ها دردوره های زمانی7، 60،30،15و90 روز مورد بررسی بافت شناسی قرار گرفتند و از هر گروه قبل از نمونه گیری cc5 خون جهت آزمایش ESR گرفته شد. نتایج حاصله توسط تست های Kruskal-Wallis و Mann-Whitney مورد ارزیابی آماری قرار گرفتند.

یافته ها

در دوره های زمانی مشابه، آنالیز آماری نشان داد که بین مواد کاشته شده در سوراخهای اول و دوم با سوراخ کنترل از نظر واکنش بافتی دارای اختلاف معنادار هستند، ولی در ارزیابی دوبه دو مواد کاشته شده اختلاف معنادار به دست نیامد. در دوره های زمانی مختلف واکنش بافتی استخوان دارای اختلاف معنادار هستند.

نتیجه گیری

از مشاهدات می توان نتیجه گرفت که مواد به کار برده شده (MTA و Portland cement) از نظر واکنش بافتی دارای سازگاری نسجی مشابهی بوده و گذشت زمان باعث بهبود التهاب پس از کاربرد مواد میشود

کلید واژگان: سلول های التهابی، تیبیا، MTA سفید و سمان پرتلند

Evaluation of Inflammatory Bone Tissue Reaction to White MTA, Porthland Cement in Rabbits

Samira Shah Siah, Mohammad Yazdizadeh, Pejman Pour Akbar Jahandideh, Mansour Jafarzadeh, Sahar Jalali, Behnaz Tavalaei

Jundishapur Scientific Medical Journal, Volume:12 Issue: 3, 2013, PP 335 -344

Background And Objective

White MTA، and Portland cement have similar chemical structures. The aim of this study was to evaluate the inflammatory reaction of rabbit bone tissues to implanted white MTA، and Portland cement. Subjects and

Methods

In this in vivo study، twenty 1-year old male Iranian rabbits (experiment white Specie)، were divided into 5 groups (4 in each group). After preparation of 3 holes (distance 2 cm- depth and diameter 2 mm) in tibia، the allocated groups received an intra-bony implant of the test materials (White MTA، or Portland cement) and the third hole، with no implant، was created to evaluate inflammatory reaction related to surgical trauma. Samples were processed for histological study after 7، 15، 30، 60، and 90 days. Furthermore، blood samples were taken for evaluation of systemic inflammation for ESR test. The results were analyzed using Kruskal-Wallis and Mann–Whitney tests.

Results

At similar time points، statistical analysis revealed significant difference between implanted material (white MTA، Portland cement) in the first and second holes with control hole due to bone tissue reaction but pair-wise evaluation Between all of implanted material found no significant differences. In different times bone tissue reaction showed significant differences.

Conclusions

The finding of this study demonstrated a similar tissue compatibility between both implantable materials and improvement of tissue healing occur with similar time profile after material implanting.

Keywords: Inflammatory cells, Tibia, White MTA, Portland cement

بررسی رادیواپسیتی یک نوع ماده جدید پرکننده ریشه دندان (NREFM) به همراه دو نوع رادیواپسی فایر و مقایسه آن ها با Pro- root MTA و سمان پرتلند

علی اخوان، الهه شفیعی راد، مژده مهدیزاده، سید بهروز موسوی، جلیل مدرسی

مجله دانشکده دندان پزشکی اصفهان، سال هشتم شماره 3 (پیاپی 31، امرداد 1391)، ص 221

مقدمه

اخیرا ماده جدید پرکننده انتهای ریشه (New root end filling material یا NREFM) با عنوان (Cold ceramic) CC جهت درمان ریشه معرفی شده است که بر اساس مطالعات مختلف سازگاری نسجی عالی، سمیت سلولی پایین و قابلیت سیل کنندگی مناسب آن به اثبات رسیده است. از جمله موارد مورد سوال این ماده رادیواپسیتی آن در کاربردهای بالینی می باشد. هدف از این پژوهش، بررسی رادیواپسیتی NREFMبا افزودن 2 نوع رادیواپسی فایر (اکسید بیسموت و سولفات باریم) و مقایسه با (Mineral trioxide aggregate) Pro-root MTA و سمان پرتلند بود.

مواد و روش ها

در این مطالعه تجربی- آزمایشگاهی، 7 گروه مواد (گروه یک 9/0 گرم NREFM + 1/0 گرم اکسید بیسموت، گروه دوم 8/0 گرم NREFM + 2/0 گرم اکسید بیسموت، گروه سوم 9/0 گرم NREFM + 1/0 گرم سولفات باریم، گروه چهارم 8/0 گرم NREFM + 2/0گرم سولفات باریم، گروه پنجم NREFM، گروه ششم Pro-root MTA، گروه هفتم سمان پرتلند که با نسبت معین آب مقطر (3/0 میلی لیتر) مخلوط و در استوانه های تفلونی با قطر داخلی 10 میلی متر و ضخامت 1میلی متر (مطابق با استاندارد ISO) قرار داده شدند تا سخت شوند. نمونه ها روی پلیت کاست (Photostimulable phosphor) PSP در مجاورت آلومینیوم Step-wedge قرار داده شد و رادیوگرافی تهیه گردید. نمونه ها در نرم افزار Digora، Scannora دانسیتومتری شدند. سپس اطلاعات با کمک نرم افزار SPSS و آزمون Kruskal-Wallis و Mann-Whitney مورد بررسی آماری قرار گرفت (05/0 = α).

یافته ها

گروه ششم بیشترین رادیواپسیتی (85/6 میلی متر آلومینیوم) و سمان پرتلند کمترین رادیواپسیتی (74/2 میلی متر آلومینیوم) را نشان دادند.

نتیجه گیری

میزان رادیواپسیتی تمامی ترکیب ها به جز سمان پرتلند در حد استاندارد بود. ترکیب 9/0 گرم NREFM + 1/0 گرم اکسید بیسموت به عنوان رادیواپسیته قابل مقایسه با MTA Pro- root پیشنهاد می گردد.

کلید واژگان: Mineral trioxid aggregate، سمان پرتلند، آلومینیوم، مسدودسازی انتهای ریشه

Radiopacity evaluation of a new root-end filling material (NREFM) with two types of radiopacifiers in comparison to pro-root MTA and Portland cement

Ali Akhavan, Elahe Shafiei Rad, Mozhdeh Mehdizadeh, Seyed Behrouz Mousavi, Jalil Modaresi

Journal of Isfahan Dental School, Volume:8 Issue: 3, 2012, P 221

Introduction

Recently a new root-end filling material (NREFM), referred to as Cold Ceramic (CC), has been introduced; different studies have shown its biocompatibility, low cytotoxicity and good sealability. One of the disadvantages of CC is its low radiopacity in clinical procedures. The aim of this study was to evaluate radiopacity of CC by incorporating different radiopacifiers (Bi2O3, BaSo4) in comparison to Pro-root MTA and PC.

Materials And Methods

In this in vitro study 7 groups of materials (Group 1: 0.9 NREFM + 0.1 gr Bi2O3; Group 2: 0.8 gr NREFM + 0.2 gr Bi2O3; Group 3: 0.9 NREFM + 0.1 gr BaSo4; Group 4: 0.8 gr NREFM + 0.2 gr BaSo4; Group 5: NREFM; Group 6: Pro-root MTA; Group 7: PC) were mixed with 0.3 mL of distilled water and placed in Teflon rings measuring 10 mm in internal diameter and 1 mm in thickness, based on ISO 6876/2001 and allowed to set. The samples were placed on PSP cassettes adjacent to a step-wedge graduated aluminum plate and radiographed. The radiographic density was determined using Digora and Scannora software programs. Data were analyzed by SPSS using Kruskal-Wallis and Mann-Whitney tests (α = 0.05).

Results

Group 6 exhibited the highest radiopacity (6.85 mm Al) and PC samples exhibited the lowest radiopacity (2.74 mm Al).

Conclusion

All the materials tested exhibited acceptable radiopacity except for PC. A combination of 0.9 gr NREFM + 0.1 gr Bi2O3 has radiopacity comparable to that of Pro-root MTA.

Keywords: Aluminum, Mineral trioxide aggregate, Portland cement, Retrograde root, end obturation

Ion release and pH of a new endodontic cement, MTA and Portland cement

Sara Amini Ghazvini, Maryam Abdo Tabrizi, Farzad Kobarfard, Alireza Akbarzadeh Baghban, Saeed Asgary

Iranian Endodontic Journal, Volume:4 Issue: 2, Spring 2009, P 74

Introduction

This in vitro study measured and compared pH and phosphate and calcium ions release of a new endodontic material (CEM cement), mineral trioxide aggregate (MTA), and Portland cement (PC) using UV-visible technique, atomic absorption spectrophotometry methods, and pH meter, respectively.

Materials And Methods

Each material was placed in a plastic tube (n=10) and immersed in a glass flask containing deionized water. Half of the samples were tested for determining pH and released ions after 1h, 3h, 24h, 48h, 7d and 28d. Remaining samples (n=5), were evaluated after 28d. Data was analyzed using one way ANOVA and Tukey tests.

Results

Results indicated that all materials were highly alkaline and released calcium and low concentration of phosphate ions in all the time intervals. CEM cement released considerably higher concentration of phosphate during the first hour (P<0.05).

Conclusion

This novel endodontic cement promoted alkaline pH in a similar manner to MTA and released calcium and phosphate. These conditions can stimulate the calcification process and explain the basic physico-chemical mechanisms of hard tissue regeneration of CEM cement.

Keywords: Calcium, CEM cement, Ion release, MTA, NEC, New material, pH, Phosphate, Portland cement

A comparative study of antimicrobial activity of ProRoot MTA, Root MTA, and Portland cement on Actinobacillus actinomycetemcomitans

Mohammad Saeed Sheykhrezai, Marzieh Aligholi, Roghayeh Ghorbanzadeh, Abbas Bahador

Iranian Endodontic Journal, Volume:3 Issue: 4, Fall 2008, P 129

Introduction

The purpose our s study was to evaluate the antibacterial effect of ProRoot MTA (PRMTA), Root MTA (RMTA) and Portland cement (PC) at their clinical concentration (70 mg/25 µL) against Actinobacillus actinomycetemcomitans (Aa) one of the prominent periodontal (pocket) microorganisms.

Materials And Methods

Agar diffusion test on Blood Agar with Hemin and Vitamin K (BAHV) was employed in this study. The microorganisms were seeded on the BAHV by spreaders. Small holes, 6 mm in diameter, were made in the BAHV by removing agar. PRMTA, RMTA and PC were placed into the wells immediately after manipulation. The plates were incubated in anaerobic atmosphere at 37°C for 72 h and the zones of inhibition were measured.

Results

In the agar diffusion test PRMTA, RMTA and PC against Aa showed zones of inhibition. Analyzing the antimicrobial activity of PRMTA, RMTA and PC according to paired one-way ANOVA and Post Hoc Test (Turkey''s test) analysis showed a statistically significant difference (P≤0.05) between PRMTA, RMTA and PC. RMTA showed the largest zone of inhibition (29 mm) against Aa. There was no difference in the zones of inhibition between the 48 and 72 h time periods.

Conclusion

In this in vitro study PRMTA and RMTA presented similar antimicrobial activity against Aa.

Keywords: Antimicrobial, Actinobacillus actinomycetemcomitans, MTA, Portland cement

Cytotoxicity evaluation of ProRoot MTA, Root MTA and Portland cement on human gingival fibroblasts

Mohammad Reza Sharifian, Mehrnoosh Ghobadi, Noushin Shokouhinejad, Hadi Hadi Assadian

Iranian Endodontic Journal, Volume:2 Issue: 4, Fall 2007, P 91

Introduction

The aim of this study was to compare the cytotoxicity of ProRoot MTA (PMTA)، Root MTA (RMTA) and Portland cement (PC) on human gingival fibroblasts (HGFs).

Materials And Methods

The extracts of the test materials were placed close to human gingival fibroblasts (HGFs) within 96-well plates. Cellular viability was assessed using MTT assay in different intervals (freshly mixed، 4، 24، and 168 hours after mixing). The data were analyzed using the One-way ANOVA and Tukey’s test at 95% significance level.

Results

It was indicated that there was not a significant difference in cytotoxicity of test materials (p>0. 05). In addition، there was not a statistically significant difference between different time intervals within each group (p>0. 05).

Conclusion

PMTA، RMTA and PC showed comparative biocompatibility while evaluated in-vitro

Keywords: Cytotoxicity, Mineral trioxide aggregate, Portland cement

مطالعه آزمایشگاهی ریزنشت آپیکالی سه ماده MTA تیره، MTA سفید و سمان پرتلند

محمدحسن ضرابی، مریم بیدرا، جمیله قدوسی، محبوبه شریفی

مجله دانشگاه علوم پزشکی رفسنجان، سال چهارم شماره 4 (پیاپی 16، پاییز 1384)، ص 262

زمینه و هدف

یکی از راه های تصحیح عدم موفقیت های درمان ریشه، جراحی انتهای ریشه دندان است. جهت بستن انتهای ریشه دندان از مواد مختلفی استفاده می شود. هدف از این مطالعه، بررسی مقایسه ای میزان ریزنشت آپیکالی سه سمان MTA (Mineral Trioxide Aggregate) تیره، MTA سفید و پرتلند به عنوان مواد رتروگرید دندان بود.

مواد و روش ها

در این مطالعه آزمایشگاهی، 57 دندان تک ریشه کشیده شده انسانی با آپکس بسته انتخاب شدند، پس از قطع تاج دندان ها، کانال ها با فایل دستی به روش step-back، آماده سازی و سپس با گوتاپرکا و سیلر AH26 به روش لترالی پر شدند. سپس ریشه ها به 5 گروه شامل، 3 گروه 15 تایی آزمایش و دو گروه 6 تایی کنترل مثبت و منفی تقسیم شدند. پس از ایجاد بول 45 درجه، حفراتی به عمق 3 میلی متر در انتهای ریشه تهیه و سه نوع سمان مورد مطالعه را در حفرات قرار دادیم. برای برقراری سیل کرونالی، حفراتی تهیه و با آمالگام پرشدند. سپس تمام طول ریشه، (به جز 1 میلی متر انتهایی) برای ایجاد مهر و موم، لاک ناخن زده شد. نمونه ها در محلول متیلن بلوی 2% به مدت 72 ساعت قرار گرفتند و سپس به طور طولی برش داده شدند و میزان نفوذ رنگ با استریومیکروسکوپ بررسی گردید. میزان ریزنشت اندازه گیری شده توسط آزمون ANOVA یک طرفه تجزیه و تحلیل شد.

یافته ها

تحلیل آماری مطالعه حاضر، هیچ تفاوت آماری معنی داری بین ریزنشت گروه های تحت مطالعه MTA تیره (52/4 میلی متر)، MTA سفید (826/4 میلی متر) و سمان پرتلند (826/4 میلی متر) به عنوان مواد رتروگرید نشان نداد.

نتیجه گیری

با توجه به یافته های فوق، می توان به استفاده از سمان پرتلند در درمانگاه امیدوار بود. توصیه می شود، مطالعات دیگری به صورت in vivo در مورد استفاده از سمان پرتلند، انجام شود.

کلید واژگان: ریزنشت آپیکالی، Mineral Trioxide Aggregate) MTA)، سمان پرتلند، ماده پرکننده انتهای ریشه

Invitro Study of Apical Micro-Leakage of Three Materials Gray MTA, white MTA and Portland Cement

Mh. Zarrabi, M. Bidar, J. Ghoddoosi, M. Sharifi

Journal of Rafsanjan University Of Medical Sciences, Volume:4 Issue: 4, 2005, P 262

Background And Objective

Retrograde surgery is a method to correct failures in endodontics, for which various materials are used. The purpose of this study was comparative evaluation of the amount microleakages of three retrograde cements: gray MTA, white MTA and Portland cement. Materilas and

Methods

In this invitro study, 57 single root human extracted teeth with mature apices, were selected. After cutting crowns, teeth were prepared with manual file (step back technique), they were obturated with gutta-percha and AH26 sealer laterally. Then roots devided into three experimental groups with 15 teeth in each group and 2 positive and negative control groups with 6 teeth in each group. After a 45o bevel, 3mm apical cavities were prepared and then each one was filled with one of the three cements. The coronal part of the roots sealed with amalgam. After nail varnishing on the root surface (except their apical 1mm of each root). All roots were immersed in 2% methylen-blue dye for 72 hrs. Then they were split and linear dye-penetration was measured by stereomicroscope. The data were analyzed statistically using one way ANOVA test.

Results

Statistic analysis of the data showed no significant difference between the three retrograde cements Gray MTA (4.520mm) white MTA (4.826mm) and Portland cement (4.826mm).

Conclusion

According to results, the use of Portland cement as a retrograde cement seems to be promising clinically. In vivo studies focusing on Portland cement are recommended.

Keywords: Apical Microleakage, MTA (Mineral Trioxide Aggregate), Portland Cement, Retrograde Filling Material

بررسی نشت باکتریال چهار ماده پر کننده انتهای ریشه: Gray Pro Root MTA، White Pro Root MTA، Root MTA و سیمان پرتلند نوع I

محمد ضرابیان، مرضیه علی قلی، نوشین شکوهی نژاد

مجله دندانپزشکی دانشگاه علوم پزشکی تهران، سال هجدهم شماره 3 (پیاپی 44، پاییز 1384)، ص 15

زمینه و هدف

تاکنون مواد زیادی جهت پر کردن انتهای ریشه در حین جراحی اندودنتیک مورد استفاده قرار گرفته است. خواص مطلوب Pro Root MTA در مطالعات مختلف in-vitro و in-vivo ثابت شده است. از سوی دیگر، بر اساس مطالعات انجام شده Root MTA (MTA ساخت ایران) و سیمان پرتلند از نظر خواص فیزیکی و بیولوژیک، مشابه Pro Root MTA می باشند. مطالعه حاضر با هدف تعیین نشت باکتریال (درصد و متوسط زمان نشت) چهار ماده پر کننده انتهای ریشه انجام شد.

روش بررسی

در این مطالعه تجربی، 76 دندان تک ریشه ای مستقیم کشیده شده انسان انتخاب شدند. آماده سازی کانال ها به روش step- back انجام شد؛ سپس 3 میلیمتر انتهای ریشه ها با زاویه 90 درجه، قطع و با استفاده از دستگاه اولتراسونیک حفره ای به عمق 3 میلیمتر در انتهای ریشه تهیه شد. دندانها به طور تصادفی به شش گروه تقسیم شدند. در چهار گروه حفره ها با Gray Pro Root MTA، White Pro Root MTA، Root MTA و Portland Cement (I) پر شدند. دو گروه نیز به عنوان شاهد مثبت و شاهد منفی در نظر گرفته شدند. سطوح جانبی ریشه ها به جز سطح قطع شده، به منظور جلوگیری از نشت باکتری از طریق توبول های عاجی و کانال های جانبی با دولایه لاک ناخن پوشانده شدند. نمونه ها از درپوش لاستیکی ویال های شیشه ای رد شدند؛ سپس کل سیستم با اتوکلاو استریل گردید. 3-4 میلیمتر اپیکال ریشه ها در محیط کشت phenol red with 3% lactose broth غوطه ور شد. سوسپانسیون Streptococcus sanguis (ATCC 10556) از قسمت کرونال به داخل کانال ها تلقیح شد. نمونه ها هر 24 ساعت جهت بررسی تغییر رنگ محیط کشت مشاهده می شدند. این بررسی به مدت 60 روز به طول انجامید. داده های این مطالعه با استفاده از آزمون آماری Log- Rank مورد بررسی قرار گرفتند و P<0.05 به عنوان سطح معنی داری در نظر گرفته شد.

یافته ها

در پایان دوره آزمایش در 50% از نمونه های Gray Pro Root MTA، 56.25% از نمونه های White Pro Root MTA، 56.25% از نمونه های Root MTA و 50% از نمونه های سیمان پرتلند نشت باکتری مشاهده شد. متوسط زمان نشت به ترتیب 6.29 ± 37.19، 5.81±36.44، 5.97±37.69 و 6.67±34.81 روز بود. بین میزان نشت (درصد و متوسط زمان نشت) در چهار گروه مورد مطالعه، اختلاف آماری معنی داری مشاهده نشد (0.9958=(P

نتیجه گیری

طبق نتایج این مطالعه، از نظر میزان نشت (درصد و متوسط زمان نشت) اختلاف آماری معنی داری بین چهار گروه مورد بررسی وجود نداشت و می توان استفاده از Root MTA و سیمان پرتلند را به دلیل مقرون به صرفه بودن پیشنهاد نمود.

کلید واژگان: نشت باکتریال، مواد پرکننده انتهای ریشه، Root MTA، Pro Root MTA، سیمان پرتلند

Evaluation of bacterial leakage of four root- end filling materials: Gray Pro Root MTA, White Pro Root MTA, Root MTA and Portland Cement (type I)

M. Zarabian, M. Aligholi, N. Shokouhi Nejad*

Journal of Dental Medicine, Volume:18 Issue: 3, 2005, P 15

Background And Aim

Today several materials have been used for root- end filling in endodontic surgery. Optimal properties of Pro Root MTA in in-vitro and in-vivo studies has been proven. On the other hand, based on some studies, Root MTA (Iranian Pro Root MTA) and Portland cement are similar to Pro Root MTA in physical and biologic properties. The aim of this study was to evaluate bacterial leakage (amount and mean leakage time) of four root- end filling materials.

Materials And Methods

In this experimental in-vitro study, seventy six extracted single- rooted human teeth were randomly divided into six groups for root-end filling with gray Pro Root MTA, white Pro Root MTA, Root MTA (Iranian Pro Root MTA), Portland Cement (type I) and positive and negative control groups. Root canals were instrumented using the step- back technique. Root- end filling materials were placed in 3mm ultra sonic retro preparations. Samples and microleakage model system were sterilized in autoclave. The apical 3-4 mm of the roots were immersed in phenol red with 3% lactose broth culture medium. The coronal access of each specimen was inoculated every 24h with a suspension of Streptococcus sanguis (ATCC 10556). Culture media were observed every 24h for colour change indicating bacterial contamination for 60 days. Statistical analysis was performed using log- rank test with P<0.05 as the limit of significance.

Results

At the end of study 50%, 56.25%, 56.25% and 50% of specimens filled with Gray Pro Root MTA, White Pro Root MTA. Root MTA and Portland Cement (type I) had evidence of leakage respectively. The mean leakage time was 37.19±6.29, 36.44±5.81, 37.69±5.97 and 34.81±6.67 days respectively. Statistical analysis of data showed no significant difference among the leakage (amount and mean leakage time) of the four tested root- end filling materials (P=0.9958).

Conclusion

Based on the results of this study, there were no significant differences in leakage among the four tested groups at 60 days. The results suggest that Root MTA and Portland Cement can be used as less expensive root filling materials.

Keywords: Bacterial leakage, Root end filling materials, Root MTA, Portland cement

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