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2008

Chulalongkorn University Dental Journal

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Full-Text Articles in Medicine and Health Sciences

Effects Of Coupling Agents And Storage Times On Transverse Strength Of Acrylic Resin With Glass Fiber Reinforcement, Prapaporn Homjunjeerung, Issarawan Boonsiri Sep 2008

Effects Of Coupling Agents And Storage Times On Transverse Strength Of Acrylic Resin With Glass Fiber Reinforcement, Prapaporn Homjunjeerung, Issarawan Boonsiri

Chulalongkorn University Dental Journal

Objective To determine the effects of two different coupling agents and storage times on transverse strength of acrylic resin with glass fiber reinforcement. Materials and methods Eighty test specimens (2x2x25 mm) made of chemically activated acrylic resin were divided into four groups: (A) no fibers; (B) non-impregnated glass fibers; (C) silane impregnated glass fibers and (D) titanate impregnated glass fibers. The specimens in group B-D were reinforced with 10% volume of glass fibers which were oriented parallel to the long axis and positioned in the center of the specimen. Each group was subdivided to store in distilled water for 7 …

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Bottle-Using Behaviors In A Group Of Bangkok Preschool Children, Keswadee Subsandee, Supaporn Chongvisal, Napaporn Kittitavornkul, Nantajit Wangprasertkul Sep 2008

Bottle-Using Behaviors In A Group Of Bangkok Preschool Children, Keswadee Subsandee, Supaporn Chongvisal, Napaporn Kittitavornkul, Nantajit Wangprasertkul

Chulalongkorn University Dental Journal

Objective To study the bottle-using behaviors in a group of preschool children in Bangkok, Thailand. Materials and methods The sample consisted of 970 preschool children aged 1-6 years old from one kindergarten in Bangkok. Parents/caregivers completed self-administered questionnaires including information related to demographic data, the childrenûs bottle using or weaning status and the parentsû attitudes towards bottle using. Results Out of 824 questionnaires returned (85%), 605 were valid (73.4%). Results showed that 58.2% (352/605) of children (age 2.6 ± 0.9 years) still used a feeding-bottle while 41.8% (253/605) already weaned from bottle (age 4.2 ± 1.2 years). The mean age …

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Study Of Sewage Water Quality In The Faculty Of Dentistry, Chulalongkorn University, Piboon Kirdphoksap, Pravej Serichetaphongse, Em-On Benjavongkulchai, Suphot Phattanasri, Pichaya Rachdawong, Wannadara Intarapanya, Jantarawan Tancharoen Sep 2008

Study Of Sewage Water Quality In The Faculty Of Dentistry, Chulalongkorn University, Piboon Kirdphoksap, Pravej Serichetaphongse, Em-On Benjavongkulchai, Suphot Phattanasri, Pichaya Rachdawong, Wannadara Intarapanya, Jantarawan Tancharoen

Chulalongkorn University Dental Journal

Objective To investigate the quality of sewage water, the amounts of heavy metals, and the environmental effects of the dental substances, chemicals, and hazardous substances within the Faculty of Dentistry, Chulalongkorn University, which has not enough data. As a consequence, the study results will be used as a considering factor in the system-designing project for sewage water treatment, along with assigning the way of usage, storage and disposal of chemicals and hazardous substances. Materials and methods This present study was conducted by random sampling the sewage water, wastewater and fresh water at ten locations within the peak periods of the …

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Cross-Cultural Adaptation Of The Professional Role Orientation Inventory For Thai Dentists, Chanchai Hosanguan Sep 2008

Cross-Cultural Adaptation Of The Professional Role Orientation Inventory For Thai Dentists, Chanchai Hosanguan

Chulalongkorn University Dental Journal

Objectives The objectives of this research are to cross-culturally adapt the Professional Role Orientation Inventory for Thai dentists and to evaluate the equivalence between the original and Thai versions. Materials and methods Cross-cultural adaptation of the Professional Role Orientation Inventory was performed according to an international guideline including the following steps: forward translation, reconciliation, back-translation, expert panel review, and pilot testing with a group of 13 dentists. Results The cross-cultural adaptation procedure revealed no major problems. Findings of panel review suggested that the original and Thai versions were semantically, conceptually, and culturally equivalent. Results of pilot test demonstrated clarity and …

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Disintegration In Water Of A Newly Developed Zinc Oxide-Calcium Sulfate Based Temporary Filling Material, Supatchara Boonyawee, Janejira Thirawat, Niyom Thamrongananskul Sep 2008

Disintegration In Water Of A Newly Developed Zinc Oxide-Calcium Sulfate Based Temporary Filling Material, Supatchara Boonyawee, Janejira Thirawat, Niyom Thamrongananskul

Chulalongkorn University Dental Journal

Objective To develop zinc oxide calcium sulfate based temporary filling material with less disintegration in water. Materials and methods Four formulas of temporary filling materials were prepared by altering the ratio of calcium sulfate and zinc oxide. Cavit was used as a control group. Twenty specimens from each group were tested to find the mean percentage of disintegration in each group. One-way ANOVA and Bonferroni multiple comparison were used to analyze data. Results The mean percentages of disintegration of the newly developed temporary filling materials were 8.884 ± 0.789, 4.930 ± 1.157, 3.629 ± 1.039 and 10.594 ± 1.097 in …

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The Compressive Strength And Flexural Strength Of Self Adhesive Resin Cements, Natchanan Withayajeakkhajorn, Chaiwat Maneenut Sep 2008

The Compressive Strength And Flexural Strength Of Self Adhesive Resin Cements, Natchanan Withayajeakkhajorn, Chaiwat Maneenut

Chulalongkorn University Dental Journal

Objective To study the compressive strength and flexural strength of self-adhesive resin cements and compare to those of conventional resin cement Materials and methods Compressive and flexural strengths of three self-etching resin cements [Rely X U100 (3M ESPE), Maxcem (Kerr), Multilink sprint (Ivoclar vivadent)] were determined and compared to those of conventional resin cement [Variolink II (Ivoclar vivadent)], using ISO 9917/2003 and ISO 4049/2000 regimens. The data were statistically analyzed using one-way ANOVA at p = 0.05. Results Mean compressive strengths of all cements were between 213.42 ± 3.74 and 278.82 ± 30.96 MPa. Variolink II showed the highest strength …

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Effect Of Diameter And Length Of Fiber Post On Failure Resistance Of Endodontically Treated Teeth Restored With Post And Core, Sirirat Ananviriyaporn, Prarom Salimee Sep 2008

Effect Of Diameter And Length Of Fiber Post On Failure Resistance Of Endodontically Treated Teeth Restored With Post And Core, Sirirat Ananviriyaporn, Prarom Salimee

Chulalongkorn University Dental Journal

Objectives To study the failure resistance of root canal treatment (RCT) teeth restored with post and core using different diameters and lengths of fiber posts. Materials and methods Thirty maxillary central incisors were divided into 3 groups. After RCT-treated, spaces for post were prepared with drill #2. All groups were restored with fiber post (D.T. light-post). The first group was restored with the size that properly fit the canal (post #2). The second group used the post with the same canal length but smaller diameter (post #1). The third group used the post that shorter than the canal length but …

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In Vitro Effect Of Calcium Hydroxide Combined With Chlorhexidine Or Stannous Fluoride In Reducing Candida Albicans In Human Root Canal, Siripen Wanasaengsakul, Chalermkwan Puworawan, Tipapun Setsirisombat, Karnnapat Peetiakarawach Sep 2008

In Vitro Effect Of Calcium Hydroxide Combined With Chlorhexidine Or Stannous Fluoride In Reducing Candida Albicans In Human Root Canal, Siripen Wanasaengsakul, Chalermkwan Puworawan, Tipapun Setsirisombat, Karnnapat Peetiakarawach

Chulalongkorn University Dental Journal

Objective To evaluate the effectiveness of calcium hydroxide combined with chlorhexidine or stannous fluoride in disinfecting the Candida albicans infected human root canal in vitro. Material and Methods Antifungal effect of reagents was examined by using agar-diffusion test and counting colony forming unit of C. albicans existed in the root canal after 7 days intracanal medication. Acid-base changing of chemical agents was also examined. Results Three types of calcium hydroxide pastes could inhibit the growth of Candida on Sabouraud dextrose agar, although the statistical differences among them were not found. The pH of calcium hydroxide pastes were all more than …

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The Effect Of 500 And 1000 Ppm Fluoride Dentifrices On Growth Of Cariogenic Bacteria: In Vitro Study, Pimpilai Limsomwong, Watcharaporn Tasachan, Patchara Pipattanagovit Sep 2008

The Effect Of 500 And 1000 Ppm Fluoride Dentifrices On Growth Of Cariogenic Bacteria: In Vitro Study, Pimpilai Limsomwong, Watcharaporn Tasachan, Patchara Pipattanagovit

Chulalongkorn University Dental Journal

Objective The purpose of this study was to compare antimicrobial effect of 500 and 1000 ppm fluoride dentifrices that distributed in Thailand. Materials and methods Streptococcus mutans (ATCC 25175), Streptococcus sobrinus (OMZ 176a) and Lactobacillus casei (IFO 3533) were involved in this study. Fluoride dentifrices brought from the local market, which six dentifrices were containing 500 ppm fluorides and six dentifrices were containing 1000 ppm fluoride. Supernatants from each were prepared, soluble fluoride ion was analyzed by fluoride electrode, and bring to test against bacteria in agar plates by agar diffusion method. The diameter of the bacterial zone of inhibition …

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Antimicrobial Activity Of Aluminium Chloride Against Streptococcus Mutans And Aggregatibacter Actinomycetemcomitans, Pravej Serichetaphongse, Watcharaporn Tasachan, Supparaporn Kantasuwan, Pasutha Thunyakitpisal Sep 2008

Antimicrobial Activity Of Aluminium Chloride Against Streptococcus Mutans And Aggregatibacter Actinomycetemcomitans, Pravej Serichetaphongse, Watcharaporn Tasachan, Supparaporn Kantasuwan, Pasutha Thunyakitpisal

Chulalongkorn University Dental Journal

Objective To investigate the antimicrobial activity of aluminium chloride against Streptococcus mutans and Aggregatibacter actinomycetemcomitans, in vitro. Materials and methods An inhibitory activity was determined by using broth dilution technique and time kill method. S. mutans and A. actinomycetemcomitans were grown in tryptic soy broth and brain heart infusion, respectively. Both organisms were treated with different concentrations of aluminium chloride [0.05, 0.1, 0.2, 0.3, 0.4 and 0.5% (w/v)] at 37 ÌC, 5% CO2 for 0.5, 3, 6, 9, 18 and 24 hours. Their survivals were evaluated in comparison to the control using drop plate method. Results The minimum inhibitory concentration …

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Effect Of Acemannan On The Dentinsialophosphoprotein And Dentin Matrix Protein 1 Mrna Expressions In Primary Human Pulpal Cells, Pechanika Lardungdee, Pornpun Asvanit, Pasutha Thunyakitpisal Sep 2008

Effect Of Acemannan On The Dentinsialophosphoprotein And Dentin Matrix Protein 1 Mrna Expressions In Primary Human Pulpal Cells, Pechanika Lardungdee, Pornpun Asvanit, Pasutha Thunyakitpisal

Chulalongkorn University Dental Journal

Objective To investigate the effect of acemannan isolated from Aloe vera gel on the steady level of dentinsialophosphoprotein (DSPP) and dentin matrix protein 1 (DMP 1) mRNAs in primary human pulpal cells. Materials and methods Cells were treated with the designated concentrations of acemannan (0.25, 0.5 and 1 mg/ml) for 24 hours. The reverse transcription-polymerase chain reaction assays were used to investigate the effects of acemannan on the steady level of DSPP and DMP 1 mRNAs. Results At 24 hours of incubation, acemannan (0.5 mg/ml) significantly enhanced the expressions of DSPP and DMP 1 mRNA levels up to 1.93 and …

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Effects Of Dental Radiation On The Expression Of Apoptotic-Related Genes In Primary Human Bone Cells, Sakarat Pramojanee, Prasit Pavasant, Soontra Panmekiate Sep 2008

Effects Of Dental Radiation On The Expression Of Apoptotic-Related Genes In Primary Human Bone Cells, Sakarat Pramojanee, Prasit Pavasant, Soontra Panmekiate

Chulalongkorn University Dental Journal

Objective To investigate the effects of dental radiation on the expression of apoptotic-related genes in primary human bone cells. Materials and methods Human bone cells were grown in 15% FBS-DMEM and irradiated with 0, 1, 2 doses of a periapical radiograph. The cytotoxicity of irradiation was investigated by MTT assay after 24 hours. The levels of apoptotic-related gene expressions, Bcl-2, Bax, Bad, Bcl-xL, caspase-3 were analyzed by reverse transcription polymerase chain reaction, four hours after irradiation. Results No cytotoxicity was observed at the time of 24 hours after dental irradiation. The results indicated that Bax and caspase-3 significantly decreased after …

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Satisfaction And Feeling Of Maxillofacial Patients After Rehabilitation With Intra Oral Prostheses, Niyom Thamrongananskul, Kalaya Udom, Piyawat Phankosol Sep 2008

Satisfaction And Feeling Of Maxillofacial Patients After Rehabilitation With Intra Oral Prostheses, Niyom Thamrongananskul, Kalaya Udom, Piyawat Phankosol

Chulalongkorn University Dental Journal

Objective To study the satisfaction and feeling of the partial maxillectomy patients after intra-oral prosthesis rehabilitation in the field of function, esthetic, and self-confident. Materials and methods Twenty five maxillectomy patients were asked to answer the questionnaires which composed of three parts: 1. general information 2. medical and dental history, and 3. satisfaction and feeling including insertion, eating, sealing, speech, esthetic, self-confidence, and discouraging after the surgery. The answers of satisfaction and feeling were divided into three levels: least, modulate, and most. The percentage of data was collected. Results The respondents were 14 males and 11 females with average 42.0 …

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The Study Of Clinical Size Of Natural Upper Anterior Teeth In A Group Of Thai Population, Orapin Kaewplung, Warangkana Yanyongkasemsuk, Oratoon Wisitsilp Sep 2008

The Study Of Clinical Size Of Natural Upper Anterior Teeth In A Group Of Thai Population, Orapin Kaewplung, Warangkana Yanyongkasemsuk, Oratoon Wisitsilp

Chulalongkorn University Dental Journal

Objective To evaluate the average value and to study the influence of gender and age on the clinical size of six upper natural anterior teeth. Materials and methods Eighty Thais with age range 25-80 years were randomly selected and divided into male and female equally. The width and the length of upper anterior teeth were measured in two dimensions from casts. The relationship between the obtained data and other factors such as intercanine width or the adjacent tooth width, were analyzed with T-test at 95% confidential level. Results When compared between genders, it was found that the average width of …

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Microtensile Bond Strength Of Self-Adhesive Resin Cements To Enamel Or Dentin, Yuttana Khuwuttayakorn, Chaiwat Maneenut May 2008

Microtensile Bond Strength Of Self-Adhesive Resin Cements To Enamel Or Dentin, Yuttana Khuwuttayakorn, Chaiwat Maneenut

Chulalongkorn University Dental Journal

Objective To compare microtensile bond strength at enamel or dentin-resin interface of self-etch resin cements. Material and methods Enamel or dentin surface of human third molars were flattened using a highspeed diamond bur. Resin composite blocks (Filtex Z350) were bonded to tooth surface using a selfetch resin cement (Panavia F 2.0) and three self adhesive resin cements (Rely X U100, Maxcem and Multilink Sprint). The specimens were stored for 24 hours in distilled water at 37 ÌC, the specimens were sectioned into hourglass shape and tested for μTBS testing at a cross-head speed of 1 mm/min. Mean bond strength were …

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Assessment Of Leakage Of Roots Filled With Epiphany® And Resilon® After Final Irrigation With 2% Chlorhexidine, Chureerat Kanchanakaew, Somsinee Pimkhaokham, Jeerus Sucharitakul May 2008

Assessment Of Leakage Of Roots Filled With Epiphany® And Resilon® After Final Irrigation With 2% Chlorhexidine, Chureerat Kanchanakaew, Somsinee Pimkhaokham, Jeerus Sucharitakul

Chulalongkorn University Dental Journal

Objective The purpose of this in vitro study was to compare the leakage of roots filled with Epiphany® and Resilon® after final irrigation with 2% chlorhexidine. Materials and methods Seventy single-rooted teeth were prepared using crown down technique and divided to three experimental groups of twenty samples each and positive and negative control groups of five samples each. In each experimental group, root canal was irrigated with 2.5% sodium hypochlorite and 17% EDTA then final irrigated with sterile water (group 1), 2% chlorhexidine (group 2) or 2.5% sodium hypochlorite followed by 2% chlorhexidine (group 3). The experimental groups were filled …

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Comparison Of Chemical Composition And Physical Properties Of Two Thai White Portland Cements With Bismuth Oxide Versus White Proroot® Mta, Sirikwan Sirichaivongsakul, Anchana Panichuttra May 2008

Comparison Of Chemical Composition And Physical Properties Of Two Thai White Portland Cements With Bismuth Oxide Versus White Proroot® Mta, Sirikwan Sirichaivongsakul, Anchana Panichuttra

Chulalongkorn University Dental Journal

Objective To compare the chemical composition and physical properties of two Thai White Portland cements adding bismuth oxide and White ProRoot® MTA. Materials and methods X-ray analytical microscope probe and particle size analyzer were used to determine chemical composition and particle sizes of two Thai White Portland cements adding bismuth oxide and White ProRoot® MTA. Scanning electron microscopy was used to analyze morphological characteristics. Then pH meter with temperature compensated electrode was used to measure pH value every 1 minute for 1 hour. Radiopacity of the sample was compared with aluminium stepwedge under ISO 6876(2001). Setting times were determined under …

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The Comparison Of Frictional Force In Two Passive Self-Ligating Brackets And A Conventional Bracket, Buntoon Chotiwannaporn, Porntip Chiewcharat, Niramol Chamnannidiadha May 2008

The Comparison Of Frictional Force In Two Passive Self-Ligating Brackets And A Conventional Bracket, Buntoon Chotiwannaporn, Porntip Chiewcharat, Niramol Chamnannidiadha

Chulalongkorn University Dental Journal

Objective The purpose of this study was to compare the frictional resistance of two types of passive self-ligating brackets and a conventional bracket. The two passive self-ligating brackets were Damon 3MX that kept the wire inside the slot by a sliding door and Smartclip that held the wire by two slipping clips while the conventional bracket (Gemini) kept the wire inside the slot by an elastomeric ring. Materials and methods Three experimental groups were tested by using three different materials in active configuration. Each group consisted of 30 samples. At critical angle 3 degrees, static frictional resistance was evaluated by …

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Effects Of Corrosion From Fluoridecontaining Products On Static Friction Between Stainless Steel Brackets And Different Types Of Archwires, Pintu-On Chantarawaratit, Somsak Chengprapakorn May 2008

Effects Of Corrosion From Fluoridecontaining Products On Static Friction Between Stainless Steel Brackets And Different Types Of Archwires, Pintu-On Chantarawaratit, Somsak Chengprapakorn

Chulalongkorn University Dental Journal

Objective To investigate and compare the levels of static frictional forces between stainless steel brackets and two types of orthodontic wires after immersion in three types of solutions which contained fluoride products. Materials and methods Canine standard stainless steel brackets (Dyna-lock, 3M Unitek) with stainless steel wires (Stainless Steel, Ormco) and beta-titanium wires (TMA, Ormco) were immersed in three types of the solutions which contained the artificial saliva and fluoride products: fluoride toothpaste, fluoride mouthwash and fluoride gel (APF) at 37 ÌC. In this study, each group included 25 bracket-wire specimens. The static frictional forces were measured by using a …

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The Antimicrobial Effect Against Streptococcus Mutans Of Glass-Ionomer Cement Containing Polysaccharide Gel From Durian Fruit-Hulls, Suthapar Sri-Arunotai, Paiboon Techalertpaisarn, Pasutha Thunyakitpisal, Sunan Pongsamart May 2008

The Antimicrobial Effect Against Streptococcus Mutans Of Glass-Ionomer Cement Containing Polysaccharide Gel From Durian Fruit-Hulls, Suthapar Sri-Arunotai, Paiboon Techalertpaisarn, Pasutha Thunyakitpisal, Sunan Pongsamart

Chulalongkorn University Dental Journal

Objective To investigate the antimicrobial effect of glass-ionomer cement containing polysaccharide gel from durian fruit-hulls against Streptococcus mutans in vitro. Materials and methods The powder mixtures of 4.76, 7.50, 9.09 and 12.50 percent by weight of polysaccharide gel from durian fruit-hulls and glass-ionomer cement were prepared as experimental groups. Then, the test substances were mixed with the liquid part following the manufacturerûs instructions and poured in the cylindrical brass mold with 3 mm in diameter and 2 mm in height. Each group was composed of 6 specimens. Glass-ionomer cement alone was used as a negative control group, while a mixture …

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Lateral Cephalometric Analysis In A Group Of Thai Patients With Obstructive Sleep Apnoea Syndrome, Chatpon Jamsirirojrat, Panunn Sastravaha, Prakobkiat Hirunwiwatkul, Sukalaya Lerdlum, Somchai Sessirisombat May 2008

Lateral Cephalometric Analysis In A Group Of Thai Patients With Obstructive Sleep Apnoea Syndrome, Chatpon Jamsirirojrat, Panunn Sastravaha, Prakobkiat Hirunwiwatkul, Sukalaya Lerdlum, Somchai Sessirisombat

Chulalongkorn University Dental Journal

Objective To evaluate the lateral cephalometric parameters in a group of Thai patients with severe obstructive sleep apnoea syndrome (OSAS) and primary snoring. Materials and methods This study was performed in the lateral cephalograms of 190 patients attending Snoring Clinic at King Chulalongkorn Memorial Hospital during 2003-2007. Using the respiratory disturbance index (RDI), the patients were divided into two groups, those with an RDI of five events/hour or below (primary snoring group) and those with an RDI of 30 events/hour or over (severe OSAS group). Their demographic data, along with nine parameter data from lateral cephalograms, were collected. Analyses of …

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The Relation Of Socio-Economic Factors And Health Behaviors Of The Parents To Caries Status Of A Group Of 3-Year-Old Children In Bangkok, Preeya Attavanich, Yuttana Punya-Ngarm, Ravewan Punya-Ngarm May 2008

The Relation Of Socio-Economic Factors And Health Behaviors Of The Parents To Caries Status Of A Group Of 3-Year-Old Children In Bangkok, Preeya Attavanich, Yuttana Punya-Ngarm, Ravewan Punya-Ngarm

Chulalongkorn University Dental Journal

Objective To identify the relationship of the socio-economic environment and health related behavior of the parents to caries status of the children aged 3 years. Materials and methods Two hundred and sixty-seven samples were randomly selected from 3 year old children in Bangkok Metropolis who attended government and non-government nurseries during official hours. The subjects were examined for their caries status according to the World Health Organization's criteria. The purposive questionnaire were sent to the parents to assess their socio-economic and health related behaviors. The socio-economic data included type of habitat and family member, educational level, income level and type …

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A Comparison Of The Static Frictional Forces Between Stainless Steel Brackets And Various Types Of Orthodontic Wires At Different Angulations In The Wet State, Pornpetch Rujitwattana, Vachara Phetcharakupt, Piyarat Apivatanagul May 2008

A Comparison Of The Static Frictional Forces Between Stainless Steel Brackets And Various Types Of Orthodontic Wires At Different Angulations In The Wet State, Pornpetch Rujitwattana, Vachara Phetcharakupt, Piyarat Apivatanagul

Chulalongkorn University Dental Journal

Objective To compare the static frictional forces measured in 37 ± 1 ÌC artificial saliva between stainless steel brackets and 4 types of orthodontic wires when the angulations between the brackets and the wires are 0, 1 and 2 degrees, respectively. Materials and methods The static frictional forces of the 0.018 inch slot canine standard edgewise brackets and 4 types of 0.016 x 0.022 inch wires which were stainless steel, Sentalloy® medium, Sentalloy® heavy and TMA® COLORTM (honeydew) were measured by using the Lloyd universal testing machine at the second-order angulations of 0, 1 and 2 degrees. The measurements were …

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Acceptable Facial Profiles In Thai Non-Straight Profile Patients, Paega Jarungidanan, Kanok Sorathesn May 2008

Acceptable Facial Profiles In Thai Non-Straight Profile Patients, Paega Jarungidanan, Kanok Sorathesn

Chulalongkorn University Dental Journal

Objective This study aimed to determine the acceptable facial profiles in non-straight profile patients. Gender difference was also considered to have an effect on the profiles. Orthodontists were also asked to find out the possible differences in patientsû facial profile preferences. Materials and methods The patientsû pre-treatment lateral cephalometric radiographs were traced. Soft tissue landmarks (G, A, Pgû) were marked and facial contour angles (FCA) were measured. Fifty-eight patients were selected by a purposive sampling method and divided into 3 groups: concave, straight, and convex profiles according to Thai norms. Nineteen orthodontists were included in this study as the gold …

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Antibacterial Effect On Enterococcus Faecalis Of Erbium, Chromium: Yttrium-Scandium-Gallium-Garnet Laser Irradiation Compared To Two Irrigating Solutions In Root Canals Of Extracted Human Teeth, Thalerngsak Samaksamarn, Chantavat Sutthiboonyapan, Patchara Pipattanagovit, Oranart Matangkasombut May 2008

Antibacterial Effect On Enterococcus Faecalis Of Erbium, Chromium: Yttrium-Scandium-Gallium-Garnet Laser Irradiation Compared To Two Irrigating Solutions In Root Canals Of Extracted Human Teeth, Thalerngsak Samaksamarn, Chantavat Sutthiboonyapan, Patchara Pipattanagovit, Oranart Matangkasombut

Chulalongkorn University Dental Journal

Objective To compare the antibacterial effect of the erbium, chromium: yttrium-scandium-galliumgarnet (Er,Cr:YSGG) laser irradiation with two irrigating solutions in root canals of extracted human teeth. Materials and methods One hundred and twenty-five extracted single-rooted teeth were collected. The canals were then enlarged with K files to size 50 using crown-down technique and randomly assigned into four experimental groups of 30 teeth each and five teeth for sterility control group. After sterilization, all roots except the sterility control group were inoculated with 10 microlitres of a known concentration of Enterococcus faecalis ATCC29212 and incubated at 37 ÌC for 48 hours. The …

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Effect Of Polishing Instruments On The Surface Roughness Of Nanofilled Resin Composite, Karn Pipatpunyanugoon, Wichaya Wisitrasameewong, Vasana Patanapiradej May 2008

Effect Of Polishing Instruments On The Surface Roughness Of Nanofilled Resin Composite, Karn Pipatpunyanugoon, Wichaya Wisitrasameewong, Vasana Patanapiradej

Chulalongkorn University Dental Journal

Objective To evaluate the effect of different polishing instruments on the surface roughness of a nanofilled resin composite. Materials and methods Resin composite, Filtek Z350®, was condensed in an 5x4x2 mm3 block covered with a Mylar strip and then was polymerized with a curing unit for 40 seconds. One hundred and twenty specimens were randomly divided into six groups equally. The first group was a control. The others were polished with Sof-Lex® (3M), Enhance® (Dentsply), Pogo® (Dentsply), Composhape® (Intensiv) and Jet bur® (Kerr). The average surface roughness (Ra) was measured with a surface roughness tester after polishing. Surface roughness of …

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The Accuracy Of The Master Casts From Three Different Implant Impression Techniques, Kornthep Sukyukon, Parnupong Wongthai May 2008

The Accuracy Of The Master Casts From Three Different Implant Impression Techniques, Kornthep Sukyukon, Parnupong Wongthai

Chulalongkorn University Dental Journal

Objective To investigate the accuracy of the master casts from three different implant impression techniques. The master casts were compared with the master model. Materials and methods Thirty master casts were divided into three groups according to three impression techniques. Group 1 conventional impression technique at abutment level, group 2 direct implant impression technique and group 3 splinted direct implant impression technique. The master model was composed of two implants embeded in rectangular metal base with three reference points on the shoulder of each abutment. The master model was duplicated by additional silicone with three impression techniques then the impressions …

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Dental Surveyor: An Innovative Design, Vichet Chindavanig Jan 2008

Dental Surveyor: An Innovative Design, Vichet Chindavanig

Chulalongkorn University Dental Journal

Objective To design a dental surveyor with minimized component parts and low production cost for Thailand economic foundation. Materials and methods An imported product was studied as a comparative model. Then, synthesis an alternative design of which prefabricated objects was assembled into a mechanical tool. Work simplification design philosophy comprising of reducing components, and custom made parts resulted tominimizing production cost. Results Implication a design predominating with polymer is presenting for use as an alternative tool in dental education and chair-side. Sale price is nearly fifteen times less than an imported product of the same use. Conclusion This innovative design …

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Sporicidal Effects Of Common Disinfectants And Their Practical Application In Dental Practice In Thailand, Pratanporn Arirachakaran, Wanpen Sinheng, Talent Theparee, Amy Alisara Arirachakaran Jan 2008

Sporicidal Effects Of Common Disinfectants And Their Practical Application In Dental Practice In Thailand, Pratanporn Arirachakaran, Wanpen Sinheng, Talent Theparee, Amy Alisara Arirachakaran

Chulalongkorn University Dental Journal

Objective Sporicidal activity is a good indicator for testing the efficacy of chemical disinfectants in infection control. We tested the sporicidal effect of common germicides used in Thailand. Materials and methods The spore-forming bacteria Bacillus atropheas and Geobacillus stearothermophilus were chosen to test four commercial chemical agents: sodium hypochlorite, 2% glutaraldehyde, 35% hydrogen peroxide, and iodophore. Staphylococcus aureus, Pseudomonas aeruginosa, and Salmonella typhi were also used to ensure compliance with EPA (Environmental Protection Agency) and AOAC (Association of Analytical Communities) laboratory standards for hospital disinfectants. Results Two percents glutaraldehyde inactivated B. atropheas and G. stearothermophilus at 60 and 30 min, …

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The Response Of Human Bone Marrow Stromal Cells To Osteopontin And Bovine Dermal Collagen: An In Vitro Study, Papatpong Sirikururat, Suphot Tamsailom, Pi-Ling Chang, Somporn Swasdison Jan 2008

The Response Of Human Bone Marrow Stromal Cells To Osteopontin And Bovine Dermal Collagen: An In Vitro Study, Papatpong Sirikururat, Suphot Tamsailom, Pi-Ling Chang, Somporn Swasdison

Chulalongkorn University Dental Journal

Objectives To study the response including cell proliferation and cell attachment of human bone marrow stromal cells to collagen and osteopontin in vitro. Materials and methods The study was performed by co-culturing human bone marrow stromal cells with bovine dermal collagen and recombinant rat osteopontin. MTT assay was utilized to determine the cell proliferation and cytotoxicity resulted from the cells being exposed to four conditioned surfaces, uncoated, collagen-coated, osteopontin-coated and mixed collagen/osteopontin-coated. Cell attachment to these four conditioned surfaces was also investigated under the scanning electron microscope. Results The cells exposed to the collagen-coated and the mixed collagen/osteopontin-coated surfaces demonstrated …

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