Chiang Mai Dental Journal

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Adhesive bond strength between fiber post and resin composite: A pilot study
(Chiang Mai Dental Journal, 2010-06-16) Sawittree Anuphan; Pavisuth Kanjantra; Thepparat Khemaleelakul
The purpose of this study was to evaluate the bond strength between fiber posts and four types of resin composites: Tetric® Ceram, MultiCore® HB, MultiCore® Flow and FiltekTM Z350. Sixteen FRC Postec® posts were cleaned with alcohol and coated with silane coupling agent. The fiber posts were divided into four groups and placed centrally in cylindrical molds which were then filled with one of the resin composites to a diameter of 6 mm. The cylindrical specimens were then sliced to make disc specimens 1 mm. thick. The shear bond strengths were tested using the Universal Testing Machine with cross head speed at 0.5 mm./min. to measure the force (MPa) which pushed the posts out of the resin composites. The means of bond strength were statistically analyzed using One-way ANOVA and LSD. The results showed that the mean bond strength between MultiCore® Flow and fiber posts was the highest and was significantly higher than those of Tetric® Ceram and FiltekTM Z350 (p\< 0.05). Keyword: bond strength, fiber posts, resin composites
Adhesive bond strength between resin cements and root canal dentin
(Chiang Mai Dental Journal, 2010-06-03) Phanassaya Jaturanont; Pavisuth Kanjantra; Nopawong Leuvitoonvechaki
This 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
All-ceramic fixed partial denture: Clinical considerations in case selection
(Chiang Mai Dental Journal, 2010-06-03) Napaporn Adchariyapitak; Varaporn Puriwarangkaku
For esthetic reasons, all-ceramic fixed partial dentures are increasingly being used for partially edentulous patients. This article discusses criteria for choosing all-ceramic fixed partial dentures according to clinical studies. The development and clinical considerations for treating patients with these restorations are described.Keywords: all-ceramic fixed partial dentures, esthetics, zirconia
Anteriorly based tongue flap for alveolar cleft bone grafting
(Chiang Mai Dental Journal, 2010-06-02) Surakij Kijsmanmit; Rungtiva Seesead
When 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 grafting
Assessment of Interradicular Spaces for Miniscrew Implant Placement: A Systematic Literature Review
(Chiang Mai Dental Journal, 2010-06-24) Pajongjit Chaimanee; Boonsiva Suzuki; Eduardo Yugo Suzuki
The use of miniscrew implants as an orthodontic anchorage device has become an accepted method for providing absolute anchorage. The purpose of this systematic review was to summarize the safe zones in the interradicular spaces and the recommended diameters and lengths of miniscrew implants for use in interradicular spaces. The PubMed electronic database was searched for original articles to the end of December 2009. The selection criteria were human anatomical studies, written in English, about the safe zones in the interradicular spaces for miniscrew implant placement. The final selection was completed after the author read the complete articles. Most of these studies measured the availability of interradicular space in patients without malocclusion, i.e. no severe crowding, no spacing, no missing teeth except the third molars, and no periodontal disease, by using CT images. In these studies, types of occlusion or dento-skeletal patterns of the samples were not specified. In the maxilla and mandible, all interradicular sites had adequate space for miniscrew implant placement; however, the areas with adequate interradicular space at each site presented at different distances from either the cemento-enamel junction or the alveolar crest. In the maxilla, the safest site was between the second premolar and the first molar. In the mandible, the safest sites were between the first and second molars or between the first and second premolars. The recommended miniscrew diameters ranged from 1.2 to 1.5 mm with the lengths ranging from 4.0 to 10.0 mm. Based on these results, an empirical clinical guideline can be provided. However, various malocclusions and dento-skeletal patterns, and individual variations must be considered.Keywords: anchorage, orthodontics, interradicular space, miniscrew implant
Bioinformatics and Dentistry
(Chiang Mai Dental Journal, 2010-06-08) Jitjiroj Ittichaicharoen; Michael McCullough
Bioinformatics was established more than 40 years ago since the sequencing of the first protein by Margaret Dayhoff in 1965. Subsequently, many tools and technologies have been discovered to support Bioinformatics, and resulting in much scientific research in diverse fields such as microbiological, biomolecular and advanced medical explorations. Reciprocally, research efforts in these disciplines result in enhancing bioinformatics tools and techniques. Currently, bioinformatics has only had a superficial effect on dental research. Although many dental researchers undertake molecular research, they did not fully utilize bioinformatics. The aims of this paper is to outline how Bioinformatics can be utilized in many areas of dental research such as oral medicine, oral microbiology and oral cancer, to aid in the development of diagnostic methods, treatment planning, and potential preventive techniques.Key Words: Bioinformatics, Dentistry, Oral biology, Genomics, Proteomics
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 Thosaporn
Introduction: 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 services
Bonding to caries-affected dentin
(Chiang Mai Dental Journal, 2010-06-02) Benjamaporn Wanichwattanakosol; Piriya Cherdsathirakul
Restorative 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 dentin
Ceramic Inlays
(Chiang Mai Dental Journal, 2010-06-24) Nitayanan Jittawannarat; Pavisuth Kanjantra; Napaporn Adchariyapitak
Due to improved ceramic materials and bonding techniques, ceramics have been increasingly used for posterior restorations especially those with highly aesthetic requirements. This paper surveys the current knowledge of ceramic inlay restorations, covering the indications and contra-indications, clinical treatment procedures, survival rates, clinical performance and also causes of failures in recent clinical studies.
Comparative Analysis of International Research Publications from Thai Dental Faculties between 2000 and 2008
(Chiang Mai Dental Journal, 2010-06-24) Stitaya Sirisinha; Sittichai Koontongkaew; Ruchareka Wittayawuttikul
Objective: To study and compare the international publications of research performance during the years 2000 and 2008 from the 8 dental faculties of state universities in Thailand.Materials and Methods: Data were generated using computerized search of the databases of publications listed in the reports from Institute of Scientific Information Web of Science (ISI-WOS), Scopus and PubMed databases.Results: A total number of publications from the years 2000 to 2008 from 8 dental faculties were as followings: Chulalongkorn (CU) = 187; Mahidol University(MU) = 176; Chiang Mai University (CMU) = 106; Khon Kaen University(KKU) = 90; Prince of Songkla (PSU) = 116; Thammasat University (TU) = 21; Srinakharinwirot University (SWU) = 19; and Naresuan University (NU) = 6. Based on these data, the dental faculties could be roughly divided into 3 groups: CU and MU; CMU, KKU and PSU; and the 3 recently established TU, SWU and NU. Although the combined number of publications from these 8 dental faculties did not change much from 2000 to 2005, there was a big jump in the number between the years 2005 and 2006 and this phenomenon was observed for all faculties. In general, the quality of publications, based on journal impact factors, did not vary considerably among these dental faculties. However, it was noted that the research with results leading to publications in journals with high impact factors were mostly performed by staff members who were on leave of absence for higher degrees and/or oversea training. Conclusion: This comparative analysis of publications from the 8 Thai dental faculties between 2000-2008 provided unbiased appraisal of quantity and quality of research publications which roughly paralleled with the time when they were established, from the oldest Chulalongkorn University to the youngest Naresuan University. It is hoped that some of our suggestions and criticisms will be useful in upgrading research performance in Thai dental faculties, thus making them more competitive in national and international arena. Keywords: Thai dental faculties, ISI-WOS, International research publications, Impact factor
Comparative Study of Microleakage of Nanocomposite Resin Restoration Using Filled and Unfilled Adhesives
(Chiang Mai Dental Journal, 2010-06-03) Sirinart Cheewakriengkrai; Sumana Jittidecharaks; Yuttana Khuwuttayakorn
The purpose of this study was to evaluate the microleakage of nanofilled resin composite restorations when three adhesives that are filled adhesives : Adper® Single Bond 2 and OptiBond® Solo Plus and unfilled adhesive : Adper® Single Bond of Two-step Total-etch System were used. Sixty Class V cavities (3 mm. width, 4 mm. length and 2 mm. depth) were prepared on buccal surface of extracted human molars. Occlusal margins were located in enamel whereas gingival margins were located in dentin or cementum. Prepared cavities were divided into 3 groups of 20 cavities and restored with a nanofilled resin composite Filtex® Z 350 with one unfilled adhesive (Adper® Single Bond) and two filled adhesives (Adper® Single Bond 2 and OptiBond® Solo Plus). The adhesives were used according to the manufacturers’ instructions. The teeth were stored in distilled water for 24 hours before subjected to thermocycling between 5-55°c for 500 cycles with dwell time of 20 seconds and then immersed in 2% methylene blue dye for 4 hours. Each tooth was longitudinally sectioned in bucco-lingual direction. The sectioned specimens were examined under Stereomicroscope at 35X magnification and recorded with Digital camera. The distance of dye penetration were measured using Image J program. The data were analyzed by One-way ANOVA test (p
A Comparison of Retention Between Acetal Resin and Stainless Steel Wrought Wire Retentive Clasp Arms
(Chiang Mai Dental Journal, 2010-06-03) Atalee Vijitpan; Panya Khamenkhan; Piriya Yavirach
The objective of this study was to compare the retention of three different groups of acetal resin retentive clasp arm and a group of stainless steel wrought wire retentive clasp arm. The differences in design of acetal resin retentive clasp arms were as follow: group A, 1/3 terminal clasp arm was below a survey line and engaged retentive undercut 0.02˝ ; group B, 1/3 terminal clasp arm was below a survey line and engaged retentive undercut 0.03˝ ; group C, 2/3 terminal clasp arm was below a survey line and engaged retentive undercut 0.03˝ where as group D, stainless steel wrought wire clasp arm engaged retentive undercut 0.02˝ Tensile load of each clasp arm was performed by a Universal testing machine and the retentive force for group A, B, C, and D were 1.21, 1.67, 1.51, and 6.32 N respectively. One way ANOVA and Dunnett T3 multiple comparison reveal no significant difference in retentive force between group B and C but there were significant differences between these two groups and group A and D at p \<0.05.\ Keywords:\ acetal resin retentive clasp arm, stainless steel wrought wire retentive clasp arm
Comparison of Salivary Condition in Diabetes and Non-Diabetes Adults
(Chiang Mai Dental Journal, 2010-06-16) Mayuree Thanathipanont; Narumanas Korwanich
The objective of the study is to compare xerostomia condition, hyposalivation and some oral factors between diabetic and non-diabetic subjects. Samples of the study were 42 diabetic patients who were treated diabetes in Bangkruai hospital and other 46 non-diabetic patients who visited out-patient department of the same hospital during February and March 2008. Data was collected by using questionnaire on general history and diabetic history, and xerostomia assessment form. Salivary flow rate was investigated by spitting method. Oral condition was examined as directed by WHO. Data was analyzed by Chi-square, Independent t-test, Mann-Whitney U test and Regression statistics. It is found that there is no statistical difference of salivary flow rate, caries score, and xerostomia condition between diabetic and non-diabetic group. Contrarily, hyposalivary condition and number of teeth remaining in the mouth are related to diabetic condition statistically.Key words: xerostomia, hyposalivation, salivary flow rate, diabetes mellitus
Consideration Factors for Post and Core with Crown Restorations
(Chiang Mai Dental Journal, 2011-01-25) Weeranuch Thong-ngarm; Issarawan Boonsiri; Siriporn Arunpraditkul
Many factors should be considered for restoration of root-canal-treated teeth using posts and cores with crowns, such as materials of posts, cores and luting cements. The posts using now, there are the form of custom made and prefabricated posts made of various materials. The kind of posts affected to the choosing of luting cement and also core material. So that the restoration of teeth with posts and cores with crowns to be accomplished should have the choosing of suitable materials and techniques
Crown and Fixed Partial Denture Contours for Anterior Teeth
(Chiang Mai Dental Journal, 2011-01-25) Napaporn Adchariyapitak
The goal of crown and fixed partial denture treatment in anterior teeth is to solve esthetic problem. Apart from the ability to creating restoration color which is similar to teeth color the restoration should be made to proper contour, size, length and angulation similar to natural teeth in order to achieve esthetic fulfillment.
Crown and Fixed Partial Denture Contours for Posterior Teeth
(Chiang Mai Dental Journal, 2010-06-24) Napaporn Adchariyapitak
One of the prime goals of crown and fixed partial denture treatment is to maintain periodontal health, in which restoration contour is an important factor. In posterior teeth appropriate restoration contour promotes good function, comfort and esthetics, and facilitates the maintenance of periodontal health. Dentists should pay attention to creating suitable restoration contours in order to achieve successful treatment.
Dens Evaginatus: Management and Review of the Literature
(Chiang Mai Dental Journal, 2010-06-02) Arnon Jaruakkra
The 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, treatment
Dental Care of Patients with Hemophilia
(Chiang Mai Dental Journal, 2010-06-16) Lawan Tisase
Hemophilia is an inherited bleeding disorder. People with hemophilia bleed longer and easier caused by lack of enough clotting factor. Successful dental treatments are the result of co-operation between dentists and hematologists. Dentists who have essential roles in dental treatments should know how to manage patients with hemophilia. Keyword: Hemophilia
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 Boonsiri
The 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 alloy
Effect of Different Adhesive Systems on Shear Bond Strength of Sealants on Enamel
(Chiang Mai Dental Journal, 2010-06-24) Siriwat Wattanapanich; Darunee Owittayakul; Kamoltip Boonsongsawat; Kornchawan Tantitrakarnwatana; Suppalucksana Choeipong; Papimon Chompu-inwai
The purpose of this study was to compare shear bond strength of a sealant to intact enamel when different adhesive systems were applied. Sixty eight permanent premolars were randomly divided into 4 groups of 17 specimens. The flattest buccal area of each tooth was used as a testing surface. For the control (conventional) group, testing surfaces were treated with 37% phosphoric acid. For experimental groups, flat surfaces were treated with three different adhesive materials as follow: SB (37% phosphoric and Single Bond®); CSE (acidic primer of Clearfil SE Bond®); and AdP (Adper Prompt L- Pop®). A rubber tube of 2.0 mm in diameter and 1.5 mm in height was placed on prepared enamel and filled with sealant (Concise®), then light cured for 40 seconds. All samples were tested for shear bond strength (MPa) after thermocycling for 500 cycles. The results of this study revealed that shear bond strength in the SB group was significantly higher than other groups. Statistical analysis indicated no significant difference in shear bond strength of the CSE and the AdP group when compared with the control. In conclusion, the application of Single Bond® can improve bond strength of sealant. Moreover, the self etch adhesive may be an alternative way for sealant application which will simplify sealant procedure and shorten treatment time.Keywords: pit and fissure sealants, dental adhesive, shear bond strength

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