Central Teeth Research Articles

Differences in the Young modulus and hardness reflect different functions of teeth within the taenioglossan radula of gastropods

One important autapomorphy of molluscs is the radula, which is the anatomical structure used for feeding in most species of Mollusca. As this phylum represents the second species-richest animal group inhabiting very diverse environments, it is not surprising that the morphology of the radula and its teeth is also very diverse between taxa. However, the taenioglossan radulae are remarkable because its tooth types (central, lateral, and marginal teeth) are highly distinct in their morphology within the same radula. There are several hypotheses attempting to explain this tooth diversity by their functional specialisations. Here, for the first time, the functional morphology of taenioglossan radular teeth from one single species was analysed and their material properties (hardness and elasticity modulus) were characterised by nanoindentation. Spekia zonata Bourguignat, 1879 belongs to the Paludomidae inhabiting and feeding on solid substrates in Lake Tanganyika. All tooth types show gradual and significant differences in their stiffness and hardness: from the basis, as the softest and most flexible area, to the stylus and the cusps as the stiffest and hardest areas. The flexibility of the stylus allows the teeth to act as one single feeding organ: the central and lateral teeth can stabilize each other during feeding by the rear teeth providing support to the next row. Tooth types also differ significantly in their stiffness and hardness: the central teeth consist of the hardest and stiffest material, followed by the lateral teeth and finally marginal teeth. This can be explained by different functional loads of teeth: central and lateral ones are used for scratching over the substrate while the marginals serve mainly as brooms collecting food particles.

A new trochoidean gastropod (Vetigastropoda: Skeneidae) discovered from deep-sea hydrothermal vents in the Southern Ocean

Hydrothermal vents at the East Scotia Ridge (ESR) were the first vents to be visually confirmed and surveyed in the Southern Ocean. A trochoid snail was recovered from low diffuse flow venting sites of both E2 and E9 segments of the ESR. Taxonomic and systematic investigations revealed it to be a species hitherto unknown to science in the skeneid genus Bruceiella, which is apparently endemic to the chemosynthetic ecosystems. The new species is characterised by a large size for the genus (up to 5 mm shell width), a very broad central tooth with moderately raised horizontal basal ridge, inner marginal teeth with one single prominent protrusion on the shaft, and is described herein as Bruceiella indurata sp. nov. Described members of the genus are known from the Indian and Pacific oceans, drawing interest to the biogeographic origins of the present new species. Closest relative of the present species is Bruceiella wareni Okutani, Hashimoto & Sasaki, 2004 from Kairei vent field, Central Indian Ridge, further indicating the close relationship between East Scotia Ridge and Indian Ocean vent fauna as has been previously suggested.

Analysis of whether or not the alveolar palatine bone thickness of the central incisors is sufficient for implants of 3 mm and 3.5 mm thickness using Cone-Beam Computed Tomography

Objective: The purpose of this study was to investigate the alveloar palatine bone thickness of the maxillary central incisors using cone-beam computed tomography (CBCT).
 Material and Methods: This study used the CBCT images of 480 patients (240 male – 240 female). In order to determine bone thickness, measurements were made on the program perpendicularly to the long axis of the tooth at 3 points selected from the 3, 6 and 9 mm apical or the enamel-cement border in parallel to the long axis of the central teeth.
 Results: For the left central teeth, the mean palatine bone thickness was found for the coronal, medial and apical regions as 1.48 mm, 3.09 mm and 5.13 mm, respectively, while these values were respectively 1.35 mm, 2.95 mm and 5.10 mm for the right side.
 Conclusion: Considering that there should be a bone of at least 1 mm thickness on socket walls for immediate implantation, it was determined that palatine bone thickness is not sufficient by itself for immediate implantation. As a result of the analysis, it was seen that the palatine alveloar bone thickness that was observed in women was thinner than that in men.
 
 How to cite this article: Üner DD, İzol BS. Analysis of whether or not the alveloar palatine bone thickness of the central incisors is sufficient for implants of 3 mm and 3.5 mm thickness using cone-beam computed tomography. Int Dent Res 2019;9(2):51-7.
 
 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

In Vitro Comparison of Three Dimensional Cone Beamed Dental Tomography with Intraoral Radiography in Detection of Dental Tomography with Intraoral Radiography in Detection of Dental Root Factures Root Factures

The precise diagnosis of dental root fractures in clinical practice is quite difficult. The aim of this study is to compare the results of three dimensional cone beam computed tomography (CBCT) and conventional intraoral radiography images in the diagnosis of dental root fractures. 50 maxillar central teeth with healthy roots were shot in a single blow in laboratory environment for cracks were studied for 10 teeth and horizontal root fractures created for 40 teeth. Parts of root fractures were sticked together by forming root fractures in five groups as crack, fracture without gap and fracture with 0,2 mm, 0,4 mm and 0,6 mm gaps. Images of all teeth were taken with CBCT and conventional intraoral radiography. Accurate diagnosis averages and positive predictive value test calculated through the data taken from the evaluation results of 30 dentists. Generally the results showed that images taken by the CBCT are better than images taken by the periapical radiography which obtained with traditional methods for the diagnosis of root fractures and cracks. The results also showed that the quality of the images increased as the voxel of the CBCT images decreased. It is shown that images taken by the CBCT provides better and clearer than the images taken by the traditional intraoral radiography in order to diagnose root fractures and cracks.

Evaluation of location and dimensions of genial tubercle in patients with class I and II occlusion with cone bean computed tomography images

Introdution: Obstructive sleep apnea syndrome has potentially significant physiological and psychological consequences. The main method to control the obstructive sleep apnea syndrome is surgical advancement of genioglossus muscle (GA) or genial tubercle (GTA). Therefore, for pre-operation arrangements, surgeons definitely need to know the exact location of genial tubercle and the muscles attached to it. The aim of this study was to evaluate the location and dimensions of genial tubercle in the patients with class I and II occlusion with cone bean computed tomography (CBCT). Methods:In this descriptive cross-sectional study, cone bean computed tomographyimages of 152 adults (76 males and 76 females) with class I and II occlusion were inspected and the location and dimensions of genial tubercle (Height =GTH / Width=GTW / the distance between the apices of central teeth and the Superior border of genial tubercle=LI-SGT / the distance between the inferior border of genial tubercle and the inferior border of mandible= IGT-IBM / the anterior diameter of mandible = MT) were evaluated. Patients were classified based on their gender and occlusion type.Independent Kolmogorov-Smirnov tests were used for data analysis and thedata analyzed using SPSS16 software. Results:In all the groups, GTH was located near GTW. The measured data for GTH, GTW, LI-SGT, IGT-IBM and MT were 8.6-06 .57 mm, 8.6-19.47 mm, 7.6-13.56 mm, 8.7-47.40 mm, and 14.11-57.78 mm, respectively. No significant difference was indicated for GTW and LI-SGT based on malocclusion and for LI-SGT based on gender (P>0.05). Conclusion:Various locations and different size of this structure among patients imply that it is necessary for treatment of obstructive sleep apnea to obtain a CBCT image before surgical operation

Drought alters the spatial distribution, grazing patterns, and radula morphology of a fungal-farming salt marsh snail

Climate change is altering consumer-plant interactions in ecosystems worldwide. How consumers alter their spatial distribution, grazing activities, and functional morphology in response to climate stress can determine whether their effects on plants intensify or relax. Few studies have considered multiple consumer response metrics to elucidate the mechanisms underpinning the resulting changes in consumer-plant interactions. Here, we tested how drought stress influences the interaction between the dominant consumer, the fungal-farming periwinkle snail Littoraria irrorate/i>, and a foundational plant, cordgrass Spartina alterniflora, in a southeastern US salt marsh. In a 4 mo field experiment, we maintained moderate snail densities in mesh control chambers and clear plastic climate chambers that simulated drought by elevating temperatures and drying soils. Monitoring revealed that snails more often congregated on cordgrass stems than leaves in climate chambers than in controls. Image analyses indicated that this behavioral shift corresponded to snails inflicting shorter, but more numerous, fungal-infested scars on cordgrass leaves, and causing less plant damage in climate chambers than controls. Coincident with their net reduction in grazing, snails maintained longer radulae, whose central teeth were blunter and lateral teeth were sharper, in climate chambers compared to controls. These results suggest that under drought, snail radulae may experience less frictional wear and that, at intermediate densities, snail-cordgrass interactions relax. Together with prior research showing that at high densities, snails can denude cordgrass during drought, we conclude that consumer density, behavior, and morphological responses must be integrated in predictions of how climate change will affect the direction, strength, and stability of consumer-plant interactions.

The accuracy of cone-beam computed tomography in the evaluation of boney support of teeth among patients with a unilateral cleft of lip and palate among IraqiPopulation

Background: To evaluate the bony supports of the teeth adjacent to the area of cleft in patient with unilateral cleft lip and palate and to compare these measurements with the measurements of the same teeth in non-cleft side by using CBCT. Materials and methods: The CBCT scans of 30 patients having cleft lip( unilateral) and palate(unilateral), were analyzed and the measurements of the alveolar bony support for teeth that are adjacent to the cleft area were measured with those teeth located on opposite side (non- clef) side. For each tooth, the measurements will taken for the distance between the( cementoenamel junction) (CEJ) and the bony crest (AC) at the( buccal area) was measured and the thickness of the buccal plate At zero, one, two, and four mm. Results: The thickness of the bony support of central incisor at zero and one mm apically were statistically significantly thinner in cleft regions than in the non cleft regions. The CEJ-AC distance of the central teeth that are adjacent to the area of cleft was higher significantly than those for non-cleft area. For the canine teeth at 0, 1, 2, and 4mm apically were similar to those results obtained for central teeth at 0 and 1mm levels. Also, the CEJ-AC distance of the canine teeth that are adjacent to the cleft area was higher significantly than those for non-cleft area. Conclusion: person with unilateral cleft lip and palate showed a reduced alveolar bony support of the teeth located adjacent to the area of cleft when compared with the controls and This will cause a lot of problems in the future, so professional dental control is very essential for the maintaining of good periodontal health for those patients

Alveolar ridge alterations in the maxillary anterior region after tooth extraction through orthodontic forced eruption for implant site development: a clinical CBCT study.

To investigate the effects of orthodontic forced eruption (OFE) with the straight-wire appliance in the dimensions of the alveolar process when used for extracting compromised maxillary anterior teeth and implant site development. Cone-beam computed tomography (CBCT) scans of 7 patients needing extraction of 17 maxillary anterior teeth were obtained before and immediately after OFE. Alveolar plate height and thickness measurements were performed on the buccal and palatal socket walls in CBCT sagittal cross sections. Statistical analysis included sample size calculation, paired t-test, and Wilcoxon test to evaluate alveolar plate dimensional changes and linear regression analysis to assess whether bone changes and the feasibility of implant insertion were associated to tooth type and root length, baseline alveolar plate thickness, and age. OFE caused statistically significant reduction of the buccal alveolar plate height (1.95 ± 1.83 mm) and significant increase of the palatal alveolar plate height (1.31 ± 2.41 mm) in the central tooth socket areas. Buccal reduction was associated positively to the baseline root length and negatively to the thickness of the corresponding plate in the apical level. A non-significant increase was noted in both buccal (0.23 ± 0.93 mm) and palatal (0.63 ± 1.59 mm) proximal bone. Inadequate buccal bone support hindered immediate implant placement in six sockets; however, all inserted implants showed adequate and gradually increasing stability from insertion to final restoration. OFE resulted in favourable increase in the heights of the palatal and proximal alveolar bone and significant reduction in the buccal plate height, which inhibited implant placement in 35% of the treated sockets.

Evaluation of the fit of zirconia three-unit fixed partial dentures fabricated by different impression techniques.

The aim of the present study was to evaluate the marginal and internal fit of zirconium fixed partial denture using different impression techniques. A Nissin Typodont model, including maxillary central incisor and canine with missing lateral incisor, was selected for the present study. Thirty zirconium frameworks were fabricated following three impression techniques (N=10), conventional silicone impression (group C), scanned dental impression (group S), and Trios 3 (3Shape) intraoral scanner (group T). An extra-fine milling strategy was applied. Group T had the smallest discrepancy compared to groups C (P=0.006) and S (P=0.052) at the marginal level, whereas it was larger at the incisal tip. Discrepancies in group T were smaller than group C (P=0.004) when measured at the axial walls, and smaller than group S (P=0.045) when measured at the chamfer area for the central teeth only. Samples in group T showed a greater percentage of equally extended restorations (52.5%), while other groups were mainly underextended (group C: 63.7%, group S: 68.8%). Better adaptation was achieved with the intraoral scanner group, except at the incisal tip. Conventional and scanned impressions revealed a greater percentage of underextended restorations.

Talon Cusp: Two Case Reports

The talon is an accessory, irregular cusp on incisors and canines, involving in enamel and dentine with or without pulp tissue.It was also reported in association with syndromes, for example, Mohr Syndrome, Incontinenta pigmentii Achromians, Ellis-van Creveld Syndrome, Struge Weber Syndrome, Rubinstein Taybi Syndrome, and Alagille’s Syndrome. The aim of this paperwas to describe talon tubercules in two cases. In first case the talon cusp is seen on lingual surface of the maxillary left central tooth and there is a specific talon tubercle which extending from the incisal edge to the cervical edge, perpendicular to the mesiodistal surface of the tooth. In second case bilateral talon tubercles were detected extending from the cervical region less than half of the incisal margin on the lingual surface of the maxillary central and lateral teeth. This present two case reports radiograph gives a v-shaped radiopaque image.Talon tubercle is a dental anomaly we rarely encounter. Consequently this anomaly may occur with a systemic syndrome Therefore, clinicians should have adequate knowledge of this anomaly.

Evaluation of Root Canal Anatomy in Mandibular Incisors Using CBCT Imaging Technique in an Iranian Population

Statement of the Problem: To perform a successful endodontic treatment, sufficient knowledge about the number of root canals and their morphology is essential. Missed normal variations may burden this treatment. Purpose: This study aimed to evaluate the presence of the second canal in the roots of mandibular central and lateral incisors in an Iranian population by employing CBCT images. Materials and Method: This cross-sectional study recruited 180 CBCT image of mandible to evaluate the number of roots as well as the number and types of root canals. Data for each sample were collected in a data collection form set and analyzed by chi-square test using SPSS17 software. Results:A total of 681 permanent mandibular incisors were assessed. All samples had one root. Most of the samples (70.3%) had only one canal (type 1 Vertucci classification). The frequency of dual-canal in samples was 29.7%; the prevalence of dual-canal in mandibular lateral teeth (35%) was more than the mandibular central teeth (23.9%, p< 0.05). Following type 1 canal, type 3 (15.7%), type 5 (12.9%), type 4 (0.7%), and type 2 (0.3%) canals had the highest frequencies respectively. Conclusion:Based on this study, presence of a second canal in mandibular lateral teeth (35%) is more common than in mandibular central teeth (23.9 %). The most common canal type observed was type 1 (according to Vertucci classification) followed by type 3.

Relationship between different points on the face and the width of maxillary central teeth in a Turkish population

Statement of problemDentists may have difficulty determining the appropriate widths of the maxillary central incisors (CW) when restoring teeth for patients with edentulism. Anthropological measurements can help. PurposeThe purpose of this observational study was to evaluate the relationship between different anthropological distances on the face and the CW in a young Turkish population. Material and methodsA total of 210 Turkish dental students without dental and facial deformities participated in this study. Two different digital photographs of their face (relaxed and smiling) were taken. The intercommissural width (ICW), intermedial canthus width (MCW), interlateral canthus width (LCW), interpupillary width (IPW), interalar width (IAW), and CW were measured. The t test, Pearson correlation analysis, and multiple linear regression analysis were performed to determine the relationship between facial measurements and CW (α=.05). ResultsA significant correlation was found between facial measurements (r=0.516[ICW], r=−0.534[IAW], r=−0.639[MCW], r=−0.599[LCW], and r=−0.683[IPW]) and CW in both sexes. All facial measurements, except ICW and IPW in women and MCW in men, had a significant effect on CW according to the multiple linear regression analysis. ConclusionsIAW and LCW can be used to determine CW in both sexes. The ICW and IPW can be specific anthropological measurements for men, and the MCW can be a specific anthropological measurement for women to determine CW.

Morphological and molecular diversity of rissoellids (Mollusca, Gastropoda, Heterobranchia) from the Northwest Pacific island of Hokkaido, Japan.

This study deals with four species of marine microgastropods of the family Rissoellidae. Rissoella elatior (Golikov, Gulbin Sirenko, 1987), R. golikovi (Gulbin, 1979), R. japonica n. sp., and Rissoella sp. 1 were collected in different locations around the island of Hokkaido, Japan. Light and scanning electron microscopy (SEM) were used to study the general morphology of the shell and radula, and a region of the mitochondrial cytochrome c oxidase subunit I (COI) gene was amplified for 26 specimens. Rissoella elatior is morphologically characterized by a highly asymmetrical radula with a deep notch encircled by 10-13 minute secondary cusps on the left dorsal margin of the central tooth. Rissoella golikovi is characterized by a skeneiform shell and possession of three teeth per row on the radula. Rissoella japonica n. sp. shows five teeth per row on the radula; central tooth higher than wide; lateral and marginal teeth narrow with an outer lateral projection at the base; all teeth presenting numerous small cusps on the cutting edge. Rissoella sp. 1 is distinguished from R. japonica n. sp. in having i) very short oral lobes, ii) a mantle with a large, black patch and whitish blotches inside, and iii) different color patterns associated with the visceral mass. Although Rissoella sp. 1 probably represents an undescribed species, additional specimens are needed to complete its description. This study represents a first molecular approach to the family Rissoellidae. Studies of traditional morphological characters indicated four species, the addition of COI data raised the count to eight potential species, suggesting the occurrence of cryptic species among rissoellids.

Correlation between buccal and alveolar bone widths at the central incisors according to cone-beam-computed tomography.

The aim of this study is to assess whether there is a correlation between buccal bone thickness and mean alveolar bone thickness around the central teeth using CBCT images. Three points were selected at 3, 6 and 9 mm from the cemento-enamel junction, respectively, perpendicular to the long axis of the measuring points made to determine the width of the alveolar bone ridge. The arithmetic mean of the length measurements was taken as the average alveolar bone thickness. To determine the average buccal alveolar bone thickness, the buccal bone length was measured perpendicular to the long axis of the tooth from these 3 points, and the average of the measurements was taken from these 3 points. The mean coronal, mid-root, and apical third root widths of the maxillary, left central incisors were 7.72±0.60, 8.64 ± 0.93, and 9.23±1.45 mm, respectively and the mean widths of the buccal alveolar bone at the coronal, mid-root, and apical third root positions of the left central incisor were 1.18±0.39, 1.15±0.44, and 1.06±0.50 mm, respectively. The Spearman correlation coefficients were 0.194 and 0.191 for the left and right central incisors, respectively. There was no statistically significant difference between the alveolar bone thickness averages of the left and right central incisors, but the alveolar bone thickness was found to be thicker in males than females. Although the mean of alveolar and buccal bone thicknesses was positively correlated the statistical analysis demonstrated the correlation between the mean of alveolar and buccal bone thicknesses is not significant.

Investigation of Anterior Tooth Dimensions and Color Distribution of Young Patients of Turkish Society

Aim: The objective of this study was to evaluate the maxillary and mandibular anterior tooth size and color distribution of young people of Turkish society. Materials and method: In this study, we measured tooth dimensions and color distribution of totally 100 volunteers’. They were 18-25 years old. To ensure standardization, the measurement was made by the same researcher. Data was evaluated using SPSS 20.0 software. Descriptive data were presented as mean standard deviation. Kolmogorov-Smirnov test was used to assess the distribution of data. Independent samples t-test was used to compare boys’ and girls’ data. Results: According to the results, widest teeth within both genders is the upper central teeth, the longest teeth are the lower canine teeth, narrowest teeth is lower central teeth, shortest teeth is lower central teeth. According to the color measurements; 52.38% of the female students have A shade; 21.42% have B shade; 26.20% has C shade. 46.5% of male students have A shade; 19% have B shade; 34.5% have C shade. 49% of the total population have A shade, 20% have B shade; 31% have C shade. Conclusions: When the width, the length and the width/length ratios of different colors were compared, the difference was not recorded as statistically significant.

Application of Gallic Acid Enhances Alveolar Socket Healing

Back ground:Alveolar bone regeneration can be guided by the application of a Gallic acid following tooth extraction. Aim of the study:The present study was designed to evaluate the histological and immunohistochemical aspects of socket healing in extraction site received Gallic acid ,compared with control site that healed spontaneously. Materials and Method: Twelfth Sprague-Dawley male rats were subjected for a surgical tooth extraction of upper central teeth of both sides .The right side be the control one as the socket healed spontaneously. while left side treated with 3?L of Gallic acid. The rats were scarified at 14and 28days post extraction. Socket healing was examined histologically and evaluate immuno-expression of osteocalcin. Results: Experimental site illustrates trabecular bones formation between the peripheral and central regions of the sockets at 14 day and increment of bone formation was observed , filled most of socket at 28 days. Results show intense positive expression of osteocalcin by bone cell in experimental group in comparisum to control.The results confirmed by statistic analysis of the data ,which revealed a high significant difference in the mean of positive cells specifically at day 14 postoperative. Conclusion: The present study ,high lighted on osseo-inductive and angiogenesis effect of the local application of gallic acid in socket healing.

An evaluation using micro-CT data of the stress formed in the crown and periodontal tissues from the use of Peek post and Peek crown: A 3D finite element analysis study

Aim: Metal-supported ceramics as crown material and glass fibre posts as dental post materials are in frequent current use. In recent years, it has been claimed that stress-based biomechanical problems in dentistry can be resolved with the benefit of the low elasticity modulus of polyetheretherketone (PEEK) material. The aim of this study was to use finite element analysis (FEA) to compare the stresses formed by forces applied after the use of PEEK material as dental post and crown material as an alternative to glassfibre posts and metal-supported ceramic crowns.&#x0D; Material and Method: The stress analysis metthod used in this study was FEA. First, micro-computed tomography (micro-CT) images were obtained of a maxillary central incisor tooth and the data of the post materials scanned with a 3-dimensional (3D) laser scanner were uploaded to a computer program. 3D models were obtained with designs made in the computer program of all the materials. The modelling of a maxillary central tooth was completed using 2 different post materials (glassfibre and PEEK) and 2 different crown materials (metal ceramic and PEEK) and 4 groups were formed for analysis. By applying force of 100N at 135˚ from the absolute central point of the palatinal surface of the tooth, the stress values and distribution occurring in the 3D peiodontal models were compared. &#x0D; Results: The use of PEEK post reduced the stresses occurring on the periodontal ligament (PDL) and the cortical bone, and caused no significant change in the stresses on the crown. The use of PEEK crown reduced the stresses occurring on the crown and increased the stresses occurring on the PDL and cortical bone.&#x0D; Conclusion: With further in vitro and clinical studies of PEEK material, it can be considered that within a short time PEEK post and PEEK crown could be in routine use in dentistry.

Relationship Between Pulp Tooth Area Ratio and Chronological Age Using Cone-beam Computed Tomography Images.

This study investigated the relationship between chronological age and pulp tooth area ratio (PTR) in maxillary central teeth using cone-beam computed tomography (CBCT) images in the Turkish population. The sample consisted of CBCT images of 120 male and female subjects between 14 and 75years old. The PTR of the maxillary central teeth was calculated using inVivo 5 software (Anatomage, San Jose, CA). Data were analyzed with independent t-test and Pearson's rank correlation test. There was a significant negative correlation between chronological age and PTR (r=-0.615). The results showed that the PTR of maxillary central teeth is a reliable method for age estimation in the Turkish population.

Radula and Mandible of Biomphalaria (Planorbidae) of São Paulo, Brazil

Abstract: The radular apparatus of Biomphalaria occidentalis Paraense, 1981, Biomphalaria oligoza Paraense, 1971, Biomphalaria peregrina (d'Orbigny, 1835), Biomphalaria schrammi (Crosse, 1864) and Biomphalaria tenagophila (d'Orbigny, 1835) from the Metropolitan Region of Sao Paulo, Brazil were analyzed from Scanning Electron Microscope (SEM) micrographs. The data support the usage of characters of central, lateral and intermediate teeth in the species identification of Biomphalaria. The use of SEM provided additional quantitative and structural details to radula descriptions, which are extremely important for elucidating the taxonomy of Biomphalaria species.

Histological evaluation of orthodontic tooth movement following low level laser irradiation in rabbits.

BackgroundReduction of orthodontic treatment time is a major concern for orthodontists. Low level laser therapy (LLL) has been widely used in dentistry and it has been claimed that it could stimulate bone formation.ObjectiveThe aim of the present study was to evaluate histological effects of LLL on alveolar bone remodeling during experimental tooth movement in rabbits.MethodsIn this experimental study which was performed in the animal lab of Mashhad Dental School in 2016 twenty pre-pubertal female albino rabbits with the mean age of 8±1 weeks were randomly assigned into two groups. All the rabbits were examined by a veterinarian, and underweight or diseased rabbits were excluded from the study. Fifty gram orthodontic force was applied via 0.014 stainless steel spring on central teeth in both groups. In the first group, low level laser KLO3 (wave length: 980 nm, Power: 80mw) was irradiated three minutes from the buccal aspect of central teeth for 21 days. In the second group, rabbits were not exposed to laser irradiation and served as our control group. After this period, the distance between mesial corners of incisors was measured blindly by a caliper calibrated as 0.1mm. All rabbits in both groups were sacrificed by vital perfusion for histological evaluation to determine the number of resorption lacuna and amount of fibrous tissue. Independent sample t-test was used to analyze the data.ResultsThe number of resorption lacuna, the rate of tooth movement and fibrous tissue were significantly greater in the lased group (p=0.05).ConclusionLow level laser irradiation could accelerate tooth movement in rabbits via increased resorptive activity in alveolar bone.