Chiang Mai Dental Journal
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Item Sealing Ability of Root Canal Filling in Canals Medicated with 3Mix-MP(Chiang Mai Dental Journal, 2010-05-26) Kamonwan Tremrangsee; Saengusa KhemaleelakulThere has been a more tendency to use 3Mix-MP as intracanal medication because of its efficiency to eliminate bacteria remaining in endodontic lesion. However, Macrogol; which is a composition of vehicle may cause remnant of the medication in root canal and may affect on sealing ability of root canal fillings. The purpose of this study was to evaluate the sealing ability of root canal filling in canals medicated with 3Mix-MP. Extracted ninety-two human upper incisors were prepared and randomly divided into two groups. Group 1 was medicated with 3Mix-MP. Group 2 was not medicated. After irrigation, two teeth of each group were examined with SEM. The others were obturated with gutta percha and either AH plus or ZOE sealer. The specimens were subjected to leakage study using dye penetration method. Results showed that canals medicated with 3Mix-MP had significantly more leakage than those without medication in canals sealed with AH plus (P \< 0.05). However, there was no significantly difference of leakage among canals sealed with ZOE sealer.Keywords: sealing ability, root canal sealer, root canal filling, 3Mix-MPItem Oral Discoid Lupus Erythematosus(Chiang Mai Dental Journal, 2010-05-26) Surawut Pongsiriwet; Theerayuth Kuntharaniranan; Watcharaporn ThosapornDiscoid lupus erythematosus (DLE) is a chronic autoimmune disorder of unknown etiology. DLE can affect the skin and oral mucosa. Classic discoid rashes are frequently found on the sunlight- exposed skin, especially on the face and scalp. Oral lesions are characterized by erythematous plaques, erosions, or ulcers with radiating delicate white striae. The buccal mucosa and lip are most frequently affected. The diagnosis of oral DLE is based on clinical, histopathological and immunopathological examination. Oral lesions can be treated with topical steroids. This article reviews the etiology, clinical presentations, diagnosis and management of oral DLE.Keywords: discoid lupus erythematosus, topical steroidsItem Effect of Plasma Treatment Time on Tensile-shear Bond Strength between Fiber-reinforced Composite Post and Flowable Composite Core and Wettability on Polymer Surfaces(Chiang Mai Dental Journal, 2010-05-26) Piriya Yavirach; Pisaisit Chaijareenont; Kassara Pattamapun; Dheerawan Boonyawan; Hidekazu Takahashi; Mansuang ArksornnukitPlasma treatment is an alternative way in improving bonding properties of fiber-reinforced post. However, technical parameters of this treatment need to be clarified, especially treatment time. The purpose of this study was to evaluate the effect of plasma treatment time on adhesion between fiber-reinforced post and a flowable composite core. Two types of post, methacrylate-based matrix (FRC Postec) and epoxy resin-based matrix (DT Light post) were treated with the mixture of Helium and Nitrogen (He+N2) plasma using a radiofrequency generator with various times before bonding to flowable methacrylate-based composite. Pull-out tests were performed using a universal testing machine. One-way ANOVA revealed that the best plasma treatment time for FRC Postec and DT Post was 10 and 15 minutes respectively. The adhesive properties of both posts tend to degrade with longer plasma treatment time. Water advancing contact angles on methacrylate-based polymer and epoxy resin-base polymer were decreased as the plasma treatment time was increased.Keywords: Fiber-reinforce composite post, tensile-shear bond strength, plasma treatment, contact angleItem The Shear Bond Strength between Resin Cements and Coronal Dentin(Chiang Mai Dental Journal, 2010-05-26) Pajaree Im-udom; Siripong Sirimongkolwattana; Napaporn AdchariyapitakThe purpose of this study was to evaluate the mean shear bond strength between 3 systems of resin cements (total etch, self etch, self adhesive) and coronal dentin. The crowns of 40 extracted premolars were split longitudinally in buccolingual direction, and then split in mesiodistal direction (from DEJ 1 mm). The crowns were mounted in aluminum ring with self cure acrylic resin. Specimens were wet abraded with 600-grit SiC paper and randomly divided into 4 groups (n=20). Eighty cylinders were made with Z350 composite resin (Æ 2 mm., 3 mm. in thickness). Composite resin specimens were bonded with dentin specimens by using either resin cement Variolink® II (Group1), PanaviaTM F2.0 (Group2), RelyXTM U100 (Group3), and Multilink® sprint (Group4) strictly following manufacturer’s instructions. The specimens were stored in water at 37 ± 20C for 24 hours. The specimens were tested to failure by a Instron® universal testing machine at a crosshead speed of 0.5 mm./min. Shear bond strength data (MPa) were analyzed with one-way ANOVA and Tukey’s multiple comparison test (p0.05) but higher mean shear bond strengths(pItem Oral Health Promotion Process Development for Pre-school Children in Child-care Centers, Muang District, Nan Province(Chiang Mai Dental Journal, 2010-05-26) Chalongchai Sakolwasan; Pitchaya BatpunThe aim of this action study was to develop healthy diet program and tooth brushing behaviors for preschool children in child-care centers, Muang District, Nan Province. The study process conducted during 2005-2009, composed of initiating network with sub-district administration organization, lunch menu modification, caregivers empowerment and developing tooth brushing skill in parents. From this process, child-centers provided healthy diet program for preschool children. Parents had better oral cleansing behaviors, brushing before bedtime for their children. The outcome indicated that cooperation between sub-district administration organization, child-cared centers and families were main strategies for oral health promotion in pre school children.Keywords: Oral Health Promotion, Preschool Children, Child-care CentersItem Revascularization of Non-vital Immature Permanent Teeth with Apical Periodontitis(Chiang Mai Dental Journal, 2010-05-26) Patchanee Chuveera; Teerin LimsopathamTraditional treatments of non-vital immature permanent teeth with apical periodontitis are apexification with calcium hydroxide or MTA. It induces further development of an apex to close the foramina, but does not promote the thickness of the entire canal wall dentin and root length. A tooth with thin root dentin and large canal lumen is prone to fracture. A new treatment to regain the vital tissue has recently been introduced. It promotes development of entire canal wall dentin and root length. The advantage of this technique can reinforce the weakened root against fracture. In the early case reports this technique was called “revascularization”. It involves disinfecting the root canal system with minimum irritation of pulp tissue, providing a space or matrix of blood clot into which the cell could grow, and sealing of the coronal access. This review provides case reports, material and procedure, possible mechanism and advance technology in tissue engineering that may lead to success in revascularization.Keywords: Apexification, apexogenesis, immature teeth, open apex, revascularizationItem Zirconia All-ceramic Fixed Partial Dentures(Chiang Mai Dental Journal, 2010-05-26) Varaporn Puriwarangkakul; Napaporn AdchariyapitakAll-ceramic fixed partial dentures have been increasing interest due to demand for esthetic and metal-free restorations of the patients. Yttrium tetragonal zirconia polycrystals has the highest mechanical properties, and promising long term clinical performance. Marginal fit of zirconia fixed partial dentures machined by CAD/CAM systems are lower than metal-ceramic fixed partial dentures but within the range of clinical acceptability. Success rates of frameworks in most studies were 100 % and survival rates were 73.9 - 100 %. The most common complications of zirconia fixed partial dentures were chipping of porcelain veneer. Within the limitations of these studies, conclude that zirconia 3 - 4 unit fixed partial dentures have sufficient stability for replacement of anterior and posterior teeth. Keywords: zirconia, fixed partial dentures, estheticItem In-Office Treatment of Dentinal Hypersensitivity(Chiang Mai Dental Journal, 2010-05-26) Nitayanan Jittawannarat; Tadchan KrongbarameDentinal hypersensitivity is a common dental complaint which is characterized by short and sharp pain arising from exposed dentin in response to external stimuli. Dentinal hypersensitivity cannot be ascribed to any other forms of dental defects or diseases. This paper provides an overview of the current knowledge of epidemiology, diagnosis, etiology and clinical management of dentine hypersensitivity with emphasis on mechanism of action and clinical evidence for the efficacy of In-Office treatment to reduce dentine hypersensitivity.Keywords: Dentinal Hypersensitivity, In-Office TreatmentItem Efficiency of Disinfection with Sodium Hypochlorite, Glutaraldehyde and Peracetic Acid on Irreversible Hydrocolloid Impression(Chiang Mai Dental Journal, 2010-05-26) Marisa SukapatteeThe major problem of disinfecting the hydrocolloid impression is the microorganisms that can be imbibed into the impression. The efficient of disinfection depends on disinfectant type and method with sufficient length of treatment time. The purpose of this study was to test the efficacy of 3 disinfectants: sodium hypochlorite, glutaraldehyde, peracetic acid by spray and immersion the irreversible hydrocolloid impression for 5 and 10 minutes. The microorganisms used in this study were Pseudomonas aeruginosa and Candida albicans. Four specimens of contaminated irreversible hydrocolloid in each group were treated by 3 disinfectants by 4 methods: spray 5 and 10 minutes and immersion 5 and 10 minutes. The control group was treated by distilled water. The result was measured by counting the colonies of microorganisms left from disinfection after inoculated and incubated for 24 hours. It was found that the efficacies of all 3 disinfectants were able to inactivate both microorganisms. Both methods of treatment by spray and immersion with 5 and 10 minutes were able to reduce microorganisms statistically significant compared with control group.Keywords: disinfection, peracetic acid, sodium hypochlorite, glutaraldehyde, irreversible hydrocolloidItem Shear bond strength of quartz fiber reinforced composite posts by microwave surface treatment(Chiang Mai Dental Journal, 2010-06-02) Chadathip Pichayapan; Schvallak krauboonma; Piriya Yavirachd 7). The other 9posts were immersed in the same solution under microwave irradiation for 60sec, 90sec, 120sec respectively (group 2, 3, and 4). After the treatment, all posts were rinsed and coated with silane coupling agent. For group 8, the posts were only coated with silane coupling agent and no surface treatment was applied to the posts in group 9 (control group). Core buildup composite resin were fabricated on the posts in each group, then sectioning for 1mm-thick specimens. These specimens were tested for shear bond strength using push-out test with cross-head speed 0.5mm per minute. In surface roughness testing, two pieces of the posts in each group were randomly selected and evaluated for the surface roughness using atomic force microscope. Two-way ANOVA revealed that group 1 and 2 achieved highest shear bond strength (PItem Anteriorly based tongue flap for alveolar cleft bone grafting(Chiang Mai Dental Journal, 2010-06-02) Surakij Kijsmanmit; Rungtiva SeeseadWhen an alveolar cleft is too large to close with adjacent mucosal flaps following a primary bilateral palatoplasty exist ,a one- stage procedure for bone grafting become difficulty. The tongue flap is recommended to close large alveolar cleft. These flaps offer dependable vascularity, versatility, low morbidity, and viable augmentation of tissue-deficient area. This article reported one case used of anteriorly based tongue flap with one-stage alveolar cleft bone grafting. Keywords: tongue flap, bone graftingItem Submental intubation, alternative method for panfacial fractured patients(Chiang Mai Dental Journal, 2010-06-02) Rungtiva Seesead; Surakij KijsmanmitPatients with Panfacial fractures present a unique set of problems both for the surgeon and for the anesthesiologist. Achieving dental occlusion is one of the fundamental aims of most oral maxillofacial surgical procedures. Submental endotracheal intubation is an alternative method of intubation in the multiple facial bone fractures patients when tracheal intubation through both the oral and nasal routes is contraindication. It allows the anesthesiologist to perform general anesthesia so the maxillofacial surgeon can work smoothly without interference from the tube during the operation and minimal complication by this method. Material and methods: This study is based on the retrospective study of 15 patients with multiple facial bone fractures and were treated in dental department, Somdejphra joataksinmaharaj Hopital, between the years 2003-2008. Results: Surgery was performed under general anesthesia with submental intubation. Mean duration of surgery was 3 hours 20 minutes. No post-operative complications from submental intubation occurred in this study.Keywords: Intubation, submental, panfacial fracturesItem Effect of Adhesive Primer on Shear Bond Strength between Resin Cements and Ni-Cr Casting Alloy(Chiang Mai Dental Journal, 2010-06-02) Siripong Sirimongkolwattana; Issarawan BoonsiriThe purpose of this study was to evaluate the effect of four primers, i.e., METAFAST (MF), Cesead II Opaque Primer (CP II) METAL PRIMER II(MP II), and ALLOY PRIMER(AP), on the shear bond strength between two resin cements, Panavia F (PF) and Superbond C\&B (SB), and Nickel-chromium (Ni-Cr) casting alloys. Two sizes of cylinder specimens (f7x2, f9x2mm, 100 pairs each) were cast. They were bonded with ten combinations of four adhesive primer and two resin cements. Then they were stored in a 37±2 oC waterbath for 24 hrs, and subjected to the shear bond test using universal testing machine. Results showed the group that used PF with CP II and also demonstrated a significant difference compared to those without primer. The ones using SB with MF exhibited the greatest mean shear bond strength but no significant difference was found when compared with no primer. Conclusion of this study showed the use of CP II for bond between Ni-Cr casting alloy and PF resulted in a high bond strength. SB group was not necessary to use adhesive primer.Keywords: adhesive primer resin cement, Ni-Cr casting alloyItem Dens Evaginatus: Management and Review of the Literature(Chiang Mai Dental Journal, 2010-06-02) Arnon JaruakkraThe most complications of the teeth with dens evaginatus are occlusal interference, wear or fracture of the tubercle which are susceptible to pulpal exposure and loss of tooth vitality. The complications are often found in the newly erupting teeth with immature root formation. Hence, the treatment modalities of the teeth with dens evaginatus emphasize inducing complete root formation, both vital and non-vital teeth. Nowadays, the development of knowledge and the improvement of dental materials result in the changes of treatment modalities of the teeth with dens evaginatus over time. This article provides review of the literature of dens evaginatus regarding the treatment modalities in various situations.Keywords: dens evaginatus, apexification, apexogenesis, treatmentItem Restoring the class v sclerotic lesion(Chiang Mai Dental Journal, 2010-06-02) Tadchan Krongbaramee; Yuttana KhuwuttayakornSeveral reports have indicated that resin bond strengths to non-carious sclerotic cervical dentine are lower than those to normal dentine. Sclerotic dentine is a clinically relevant bonding substrate in which the dentine has been physiologically and pathologically altered. Hypermineralized layer on sclerotic dentin surface is resisted to acid-etching. Partial or complete obliteration of the dentinal tubules and embedded bacteria in partially mineralized matrix have effect on adhesion of resin adhesive on dentin surface. The purpose of this review was to clarify the problems encounter with this lesions, recommendation and to restore class V sclerotic lesions.Keywords: sclerotic dentine, non-carious cervical lesionItem Blood Pressure Evaluation in Dental Patients Seeking Dental Service in the Oral Diagnosis Clinic, Faculty of Dentistry, Chiang Mai University(Chiang Mai Dental Journal, 2010-06-02) Jitjiroj Ittichaicharoen; Surawoot Pongsiriwet; Siriporn Chaimano; Suruedee Chinthakanan; Nutchapon Chamusri; Wacharaporn ThosapornIntroduction: Hypertension is a common disease and related to many diseases , drug usage and many risk factors such as alcohol or caffeine consumption. Many dental patients have not realized that they have hypertension that may affect dental treatment plan. Moreover, some dental treatment may increase the blood pressure of patient. If the dentist can identify these hypertensive patients, the patients can be referred to a physician to get some treatment promptly. Therefore, the purpose of this study is to evaluate blood pressure of dental patients seeking dental services in Oral Diagnosis clinic, Faculty of dentistry, Chiang Mai, Thailand. Materials and methods: The blood pressure taken from1,194 patients seeking dental services in the clinic between July 2007 and January 2008 were recorded and classified according to American heart association recommendation. The result was described by using descriptive statistic. Results: The result revealed that 757 patients (63.4%) had normal blood pressure and 437 patients (36.6%) had high blood pressure and were classified to prehypertension , stage I hypertension and Stage II hypertension. Interestingly, half of the hypertensive patients did not known about their blood pressure condition. We also found that the mean age of peoples with prehypertension, Stage I hypertension and Stage II hypertension tended to be higher accordingly. Conclusion: We recommend to record the blood pressure of all patients who will have dental management. The patients with blood pressure higher than 140/90 mmHg should be referred to a physician for treatment and controlling the disease. Keywords: hypertension, blood pressure, dental health servicesItem Fluoride-releasing adhesive resin(Chiang Mai Dental Journal, 2010-06-02) Anyarat Paengchan; Siriwat WattanapanichThis article reviews the literature and research on fluoride-releasing adhesive resin. Secondary caries is the primary cause of dental restoration failure. One method for reducing this problem is to use fluoride containing restorative materials. This review focuses on the properties of fluoride-releasing adhesive resins in terms of fluoride releasing, fluoride uptake, secondary caries inhibition, durability and dentine bond strength. Many studies have shown that these adhesive resins promote good adhesion to dentine substances. Moreover, fluoride ions released from the adhesives could penetrate and diffuse into the cavity wall dentine and prevent secondary caries by reinforcement of the dentine wall.Keywords: fluoride-releasing adhesive resin, fluoride-containing dentin bondingItem Bonding to caries-affected dentin(Chiang Mai Dental Journal, 2010-06-02) Benjamaporn Wanichwattanakosol; Piriya CherdsathirakulRestorative treatment has procedure in excavation of carious dentin to remove only the outer layer of carious dentin which is infected and is considered to be non-remineralizable, and conserve the inner affected layer of carious dentin which is un-infected and remineralizable. Caries-affected dentin is hypermineralized due to occlusion of the tubules with acid-resistant mineral and the intertubular dentin more demineralized than normal dentin. Several changes in caries-affected dentin make decreasing in bond strength of resin adhesive compare to sound dentin. The dentists should learn about the basic knowledge of bonding to caries-affected dentin to increase effectiveness of bonding procedure in making resin composite restorationsKeywords: bonding, caries-affected dentinItem Oral rehabilitation of patients with worn dentition in category 1(Chiang Mai Dental Journal, 2010-06-02) Marisa SukapatteeMost common problems of patients with worn dentition are loss of chewing ability and esthetics, resulted from short teeth and reduced facial height. The patient with severely worn dentition can be classified into 3 categories. Category 1, excessive wear with loss of vertical dimension of occlusion, can be restored uncomplicatedly compared to category 2 and 3. This article describes the rehabilitation of patient in category 1 including the etiology of tooth wear, the examination and diagnosis, the treatment planning, the restoration procedures and the fabrication of proper occlusal scheme.Keywords: vertical dimension of occlusion, worn dentitionItem Adhesive bond strength between resin cements and root canal dentin(Chiang Mai Dental Journal, 2010-06-03) Phanassaya Jaturanont; Pavisuth Kanjantra; Nopawong LeuvitoonvechakiThis study compared shear bond strength between root canal dentin and a variety of resin cements: two self-adhesive (Rely X U100, Multilink Sprint), one with self-etch system (Panavia F 2.0) and one with total-etch system (Variolink II with 3 step). Forty single-canal premolars each provided into two pieces of 2 mm-thick disk-shaped samples and Peeso reamers No. 4 were used to prepare all canal surfaces. The specimens were randomly divided into four groups of twenty (n=20) , which were filled with one of the four resin cements and then stored in distilled water for 24 hours at 37 °C. Shear bond strengths were measured with an Instron testing machine and data analyzed by one-way ANOVA (p
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