Inflammatory Resorption Research Articles

Healing Following Implantation Of Root With Remaining Periodontal Ligament Cultured In Vitro

Background: Intentional replantation is extraction of a tooth to do extraoral root canal therapy, curettage of apical lesion when present, and its replacement in its socket. The most common causes of failure in intentionally replanted teeth are external resorption and ankylosis caused by periodontal ligament damage. We hypothesized that if proliferative cells derived from healthy periodontal ligament could cover a damaged site, the success rate of implantation and replantation would increase and thus widen its application. The purpose of this study was to histologically evaluate the influence of tissue culture on healing following implantation of root with remaining periodontal ligament cultured in vitro into a mandibular bone cavity. Methods: Twenty incisors of 5 beagles were extracted and forty trimmed roots (4.0×3.0 mm) were made using a bur. Periodontal ligament on the root surface of thirty trimmed roots was retained and remaining ten trimmed roots were removed periodontal ligament on the root surface. Thirty trimmed roots with remaining periodontal ligament were divided into three groups according to each culture sequence, namely 0 week (not cultured), 2 and 4 weeks. Following the culture period, the roots were implanted into bone cavities created in the mandible. Four weeks postsurgery, the specimens were prepared for histological analysis. Results: In the 0w group, ankylosis was observed in three of 10 cases. However, ankylosis did not occur at all in the 2w and 4w groups. However, there were no significant differences in any parameter (normal periodontum, ankylosis, surface resorption, inflammatory resorption) among the three groups. Conclusion: The mechanical injury that occurred during extraction of the teeth could be responsible for the ankylosis. If the entire root surface is covered with cultured periodontal ligament-derived cells and that could prevent ankylosis, the success rate of intentional replantation and implantation might increase.

The Effect of EMD Application for Intentional Replantation of Periodontally Involved Teeth in Dogs

Background: Intentional replantation of periodontally involved teeth has been reported to result in unfavorable healing like root resorption and ankylosis. However, many recent clinical reports using enamel matrix derivative (EMD) showed a good outcome based on clinical and radiographic examination. However, histological findings are lacking. The purpose of this study was to evaluate healing after intentional replantation with EMD in a periodontally involved teeth model. Methods: A total of 20 incisors from seven beagle dogs were used. The periodontal ligament and cementum 5 mm from the coronal part of the roots were removed, whereas those in the apical part were preserved. Ten teeth of the experimental group were transplanted following application of EMD to the root surface. Ten teeth from the control group were transplanted without application. Eight weeks after transplantation, periodontal healing was analyzed. Results: Surface root resorption in the experimental group was significantly greater than in the control. New cementum formation was observed near the apical end of the planed root of the EMD group. Replacement resorption of the EMD group was significantly less than in the control. There was no significant difference in inflammatory resorption between groups. Conclusion: The combination use of EMD in intentional replantation resulted in new cementum formation on the root planed surface and inhibited root resorption and ankylosis. However, root resorption occurred at the coronal part in areas where the surface was root planed.

Effect of the treatment of root surface-adhered necrotic periodontal ligament with propolis or fluoride in delayed rat tooth replantation

The purpose of this study was to evaluate the application of 15 % propolis and 2 % acidulated-phosphate sodium fluoride solutions on the root surface-adhered necrotic cemental periodontal ligament in delayed tooth replantation. Thirty Wistar rats (Rattus norvegicus, albinus) had their right upper incisor extracted and maintained in dry storage for 60 min. After this period, the dental papilla, enamel organ, and pulp tissue were removed, and the animals were randomly assigned to three groups: group I = immersion in saline for 10 min; group II = immersion in a 2 % acidulated-phosphate sodium fluoride solution for 10 min; and group III = immersion in a 15 % propolis and propylene glycol solution for 10 min. The root canals were filled with a calcium hydroxide paste and the teeth were replanted. Inflammatory resorption, replacement resorption, and ankylosis were observed in all groups without a statistically significant difference (p > 0.05) among them. Under the tested conditions, the application of fluoride or propolis on root surface-adhered necrotic periodontal ligament did not favor the healing process in delayed tooth replantation.

Delayed tooth replantation after treatment of necrotic periodontal ligament with citric acid

Objective: to evaluated the effect of treating root-adhered necrotic periodontal ligament (PDL) with citric acid on the healing process in delayed rat tooth replantation. Material and Methods: Forty Wistar rats, assigned to 4 groups (n=10), had their upper right incisor extracted and kept dry on a workbench. For Group I (control), the teeth were replanted after a 5-min extra-alveolar time. For the other groups, replantation was done after 60 min. In Group II, the root canals were filled with a calcium hydroxide-based paste and the teeth were replanted with no root surface treatment. In Group III, the teeth were immersed in citric acid (pH 1) for 3 min, the canals were filled with calcium hydroxide and the teeth were replanted. In Group IV, instead of the immersion, the roots were scrubbed with gauze soaked in citric acid and the teeth were replanted. The animals were sacrificed 60 days postoperatively.Results: Regarding replacement resorption, there was statistically significant difference (p<0.05) between the control group and the other three groups. No statistically significant difference (p>0.05) was found among the groups regarding the areas of inflammatory resorption. There was also a statistically significant difference (p<0.05) between the control group and Group IV regarding ankylosis. The control group showed the least replacement resorption percent means compared to the other groups (p<0.05). The root structure was more affected by replacement resorption and ankylosis in Group IV compared to the Groups II and III, but this difference was not significant statistically (p>0.05). Conclusion: the treatment of root surface-adhered necrotic periodontal ligament with citric acid was not able to prevent the occurrence of ankylosis, root resorption and inflammatory resorption in delayed rat tooth replantation.

Periodontal healing complications following extrusive and lateral luxation in the permanent dentition: a longitudinal cohort study

To analyze the risk of tooth loss and complications in periodontal ligament (PDL) healing following extrusive and lateral luxation in the permanent dentition. Eighty-two permanent teeth (78 patients) with extrusive luxation and 179 teeth (149 patients) with lateral luxation were included in the study. All teeth were examined according to a standardized protocol including clinical, photographic, and radiographic registration. Follow-up controls were performed at regular intervals (3, 6 weeks, 6 months, 1, 5, and 10 years). The risk of repair-related resorption (surface resorption), infection-related resorption (inflammatory resorption), ankylosis-related resorption (replacement resorption), marginal bone loss, and tooth loss was analyzed with the Kaplan-Meier method. Differences among subgroups were analyzed with log-rank test and Cox regression. The risk of periodontal healing complications was estimated after 3 years. Extrusive luxation: For immature root development, infection-related resorption was 2.4% (95% confidence interval (CI): 0-6.9%). For mature root development, repair-related resorption was 15.6% (95% CI: 4.4-26.7%), infection-related resorption was 5.1% (95% CI: 0-11.7%), and marginal bone loss was 17.5% (95% CI: 6.2-28.8%). No teeth showed ankylosis-related resorption, and no teeth were lost in the observation period. Lateral luxation: For immature root development, repair-related resorption was 2.1% (95% CI: 0-6.1%), infection-related resorption was 2.1% (95% CI: 0-6.1%). For mature root development, repair-related resorption was 29.5% (95% CI: 20.5-38.5%), infection-related resorption was 2.6% (95% CI: 0-6.4%), ankylosis-related resorption was 0.8% (95% CI: 0-2.3%), marginal bone loss was 6.9% (95% CI: 2.2-11.6%). The risk of severe periodontal healing complications in teeth with extrusive and lateral luxation injuries is generally low. Marginal bone loss and repair-related resorption occurred significantly more often in teeth with mature rather than immature root development. Marginal bone loss was associated with injuries involving multiple teeth.

Periodontal healing complications following concussion and subluxation injuries in the permanent dentition: a longitudinal cohort study

The purpose of the study was to analyze the risk of periodontal ligament (PDL) healing complications following concussion and subluxation injuries in the permanent dentition. A total 469 permanent teeth (358 patients) with concussion and 404 permanent teeth with subluxation were included in the study. All teeth were examined according to a standardized protocol including clinical, photographic, and radiographic registration. The risk of repair-related resorption (surface resorption), infection-related resorption (inflammatory resorption), replacement-related resorption (ankylosis), marginal bone loss, and tooth loss were analyzed with the Kaplan-Meier method. Concussion: In teeth with immature root development, no healing complications were observed. For teeth with mature root development, the risk of repair related resorption after 3 years was 3.2% (95% CI: 0.3-6.0%) and occurred only in cases where several teeth were injured simultaneously (multiple-trauma cases). The risk of marginal bone loss in teeth with mature root development was 0.7% (95% CI: 0-1.6%). Infection-related resorption, replacement resorption, and tooth loss were not observed among teeth with concussion. Subluxation: In teeth with immature root development, the risk of infection-related resorption after 3 years was 1.7% [95% confidence interval (CI): 0-3.8%]. Infection-related resorption occurred significantly more often in teeth with concomitant crown fracture (P = 0.004). For teeth with mature root development, the risk of periodontal healing complications after 3 years was: repair-related resorption, 3.6% (95% CI: 0-7.6%); infection-related resorption, 0.6% (95% CI: 0-1.7%); replacement-related resorption, 0.6% (95% CI: 0-1.7%); and marginal bone loss, 0.6% (95% CI: 0-1.7%). No teeth were lost in the observation period. The risk of periodontal healing complications after concussion as well as subluxation injuries in permanent teeth is very low.

Prevalence and types of tooth resorption in dogs with oral tumors

To determine the prevalence and types of tooth resorption in dogs with oral tumors and to compare findings with those for control dogs. 101 dogs with oral tumors and 128 control dogs that did not have oral tumors and for which dental radiographs were available. Exclusion criteria for dogs included systemic disease, long-term administration of anti-inflammatory drugs, traumatic occlusion, severe semigeneralized or generalized periodontitis, and endodontic disease. For each dog with an oral tumor, histologic sections of biopsy specimens of tumors were examined. Dental radiographic images of dogs were examined, and the presence and type of tooth resorption were determined for each tooth. Statistical analyses were performed to compare data regarding prevalence of tooth resorption. Teeth at tumor sites in dogs with nonodontogenic tumors were significantly more frequently affected with external inflammatory resorption, compared with teeth at tumor sites in dogs with odontogenic tumors. Teeth at sites distant from tumors in dogs with oral tumors were 3.2 times as likely to have external surface resorption (OR, 3.2; 95% confidence interval, 1.3 to 7.9) and 83.4 times as likely to have external inflammatory resorption (OR, 83.4; 95% confidence interval, 9.7 to 719.6) as teeth in control dogs. Resorption of teeth at tumor sites and at sites distant from tumors was common in dogs with oral tumors. Results of the present study will contribute to an understanding of the complex effects of oral tumors on local and distant hard tissues.

Pulp extirpation within 14 days after tooth replantation reduces inflammatory root resorption

Systematic review conclusion The authors of this systematic review found an association between delayed pulp extirpation (performed more than 14 days after replantation) and the occurrence of inflammatory root resorption, thereby supporting the existing clinical guidelines that recommend performing pulp extirpation within seven to 10 days after replantation. Critical summary assessment The results of this systematic review showed that although there was no association between timing of pulp extirpation and periodontal healing, functional healing, acceptable healing or replacement resorption, there was an association between pulp extirpation performed within 10 to 14 days after tooth replantation and a reduced incidence of inflammatory resorption. Evidence quality rating Poor.

TNF-induced osteoclastogenesis and inflammatory bone resorption are inhibited by transcription factor RBP-J

TNF-induced osteoclastogenesis and inflammatory bone resorption are inhibited by transcription factor RBP-J

Diagnosis and Treatment of Inflammatory Root Resorption by Intentional Reimplantation

ABSTRACT External root resorption is a lytic process occurring in the cementum or cementum and dentin of the roots of teeth. It is frequently caused by trauma. Such cases are often difficult to diagnose especially if lesion is on buccal or lingual side, and at times may be difficult to treat using conventional root canal treatment, with extraction being left the only alternative. This article describes the diagnosis and treatment of a case of inflammatory resorption of palatal wall of palatal root of maxillary left first molar by intentional reimplantation. The provisional diagnosis was made from clinical and radiographic observations. The treatment consisted of intentional reimplantation. After extraction it was found that palatal wall of palatal root had been resorbed from furcation till apex. After the resection of the palatal root at the point of resorption, tooth was obturated, reimplanted and splinted. This tooth is serving well since 5 years. How to cite this article Saini SK, Bogra P, Saini A. Diagnosis and Treatment of Inflammatory Root Resorption by Intentional Reimplantation. Int J Experiment Dent Sci 2012;1(2):106-109.

A 5-year follow-up case of multiple intrusive luxative injuries

Introduction: Traumatic intrusive luxation is one of the most severe forms of dental injuries, usually affecting the maxillary incisors. The consequence of such an occurrence is a high risk of healing complications such as pulp necrosis, external inflammatory resorption, and external replacement resorption (ankylosis). Case Report: This report presents a case of severe intrusive luxation of multiple anterior teeth in an 11-year-old girl. The teeth were repositioned successfully by endodontic and orthodontic management. The case was monitored for 5 years. Discussion: Depending on the severity of the injury, different clinical approaches for treatment of intrusive luxation may be used. Despite the variety of treatment modalities, rehabilitation of intruded teeth is always a challenge and a multidisciplinary approach is important to achieve a successful result. In this case, intruded teeth were endodontically treated with multiple calcium hydroxide dressings and repositioned orthodontically. The follow-up of such cases is very important as the repair process after intrusion is complex. After 5 years, no clinical or radiographic pathology was detected.

Calcium Hydroxide Mixed With Camphoric p-Monochlorophenol or Chlorhexidine in Delayed Tooth Replantation

This study evaluated the repair process after delayed replantation of rat teeth, using calcium hydroxide (Ca(OH)2) mixed with camphorated p-monochlorophenol (CMCP), chlorhexidine 2% (CHX), or saline as temporary root canal dressing to prevent and/or control inflammatory radicular resorption. Thirty Wistar rats (Rattus norvegicus albinos) had their right upper incisor extracted, which was bench-dried for 60 minutes. The dental papilla, the enamel organ, the dental pulp, and the periodontal ligament were removed. The teeth were immersed in 2% acidulated-phosphate sodium fluoride solution for 10 minutes. The root canals were dried with absorbent paper cones and divided into 3 groups of 10 animals according to root canal dressing used: group 1: Ca(OH)2 + saline, group 2: Ca(OH)2 + CMCP, and group 3: Ca(OH)2 + CHX 2%. Before replanting, the teeth sockets were irrigated with saline. Histological analysis revealed the presence of inflammatory resorption, replacement resorption, and ankylosis in all 3 groups. Statistical analysis showed a significant difference between group 3 and the other groups. The use of Ca(OH)2 mixed with CMCP or CHX did not show an advantage over the use of Ca(OH)2 mixed with saline in preventing and/or controlling inflammatory resorption in delayed replantation of rat teeth.

<i>In Vivo</i> and <i>In Vitro</i> Biocompatibility Study of Nanostructured Carbonate-Apatite

The objective of this study was to investigate the in vitro and in vivo biological responses to carbonate apatite (cHA) in comparison to hydroxyapatite (HA). Spheres (400<ø>500 μm) of both materials were synthesized under 5°C (cHA) and 90°C (HA) and not sintered. The in vitro cytocompatibility was determined by the XTT assay, according to ISO 10993-5:2009, after exposure of MC3T3-E1 cells to the materials extracts. Ethics Commission on Teaching and Research in Animals approved this project (CEPA/NAL 193/10) and, subsequently, the biomaterials were grafted in the subcutaneous tissues of mice (n=15). After 1 and 3 weeks, five animals of each group were killed for samples removal containing biomaterials and surrounding tissues for histological examination. Semi-serial (5-μm thick) sections were cut and stained with Hematoxylin and Eosin (HE) and the presence of inflammatory infiltrates and biomaterials resorption were evaluated. The experimental group of 3 weeks didn’t show the presence of spheres of both biomaterials and few spheres were observed after 1 week. Histological analysis showed the granulation tissue around the biomaterials with the presence of multinucleated giant cells. After 3 weeks it was observed the presence of fibrous tissue around biomaterials and few inflammatory cells. No signals of tissue necrosis were observed in both groups in all experimental studied periods. Nanostructured carbonate apatite spheres are cytocompatible, biocompatible and present initial biosorption on the subcutaneous comparable to stoichiometric HA, indicating its suitability for further studies on regenerative medicine.

Internal and external resorption in a lower molar with an associated endodontic-periodontic lesion: A case report

This article describes a unique case in which both internal and external inflammatory resorption and endodontic-periodontic lesions were present at the same time in the patient's left mandibular first molar. Based on clinical and radiographic findings, it was determined that the nature of this case was a pulpal infection-induced inflammatory resorption and furcation lesion. After root canal therapy, the furcation lesion and external inflammatory resorption were completely resolved. This case indicates that the correct diagnosis of the stimulating factor for tooth resorption and determination of the primary origin of endodontic-periodontic lesions are critical for clinical management and success.

Pulp pathosis in inlayed teeth of the ancient Mayas: a microcomputed tomography study

To evaluate three-dimensionally, using microcomputed tomography (μCT), the anatomical relationship between the cavity prepared to hold the inlay stone and the pulp chamber in the teeth of the ancient Maya. Six well-preserved teeth from Maya corpses found in an archaeological site in Guatemala (approximately 1600 year old) were selected and scanned using a high-resolution μCT system (SkyScan 1174v2; SkyScan N.V., Kontich, Belgium). The sample comprised six maxillary teeth: two canines, one premolar, two central incisors and one lateral incisor. All teeth had one or two inlay stones on the buccal surface of the crown. Each specimen was scanned at an isotropic resolution of 22.5 μm, a rotational step of 0.70°, a rotational angle of 180° and a 3.1-s exposure time, using a 1-mm-thick aluminium filter. Images of each specimen were reconstructed from apex to the crown with dedicated software (NRecon v1.6.1.5) in approximately 450 slices. CTan v1.11 and CTVol v2.1 were used for three-dimensional visualization and qualitative analysis of the external and internal anatomy of the teeth. The tooth modification in all samples was classified as type E1 (one stone on the buccal surface of the crown) or E2 (two stones on the buccal surface of the crown). In the canine teeth, the cavities created to insert the inlay stone did not reach the pulp chamber. Conversely, in the maxillary incisors, the cavities clearly perforated the pulp chamber resulting in massive internal inflammatory resorption or partial calcification of the pulp cavity. In the premolar tooth, a small perforation of the pulp chamber under the buccal cusp, without morphological alteration of the intraradicular dentine, was observed. Microcomputed tomography analysis of teeth of the ancient Maya civilization showed that the inlay cavities cut reached the pulp chamber in the maxillary incisors and premolar teeth, with the potential to cause pulp and periapical disease.

Periodontal Tissue Engineering After Tooth Replantation

Blood-derived products, platelet-poor plasma (PPP) and platelet-rich plasma (PRP), constitute an approach in the enhancement of tissue healing. PRP has also been used as a scaffold for bone marrow stem cells in tissue engineering. This study evaluates the effect of PPP, calcium chloride-activated PRP (PRP/Ca), calcium chloride- and thrombin-activated PRP (PRP/Thr/Ca), and bone marrow mononuclear cells and PRP/Ca (BMMCs/PRP/Ca) on the healing of replanted dog teeth. After 30 minutes of extraction, teeth were replanted with 1) no material (control); 2) PPP; 3) PRP/Ca; 4) PRP/Thr/Ca; or 5) BMMCs/PRP/Ca. Histologic, histomorphometric, and immunohistochemical analysis was assessed 120 days after replantation. Data from histomorphometric analysis were analyzed statistically (analysis of variance, Tukey; P <0.05). Quantitative immunohistochemical analysis was analyzed by Kruskal-Wallis and Dunn post hoc test (P <0.05). Flow cytometry analysis showed 55.98% of CD34(+) and 32.67% of CD90/Thy-1 for BMMCs sample. BMMCs/PRP/Ca presented the largest areas of replacement resorption characterized by osseous ingrowth into cementum (P <0.05), with intense immunomarcation for tartrate-resistant acid phosphatase. The PRP/Ca group also showed areas of replacement resorption with significant immunomarcation for osteopontin. PRP/Thr/Ca presented no replacement resorption. PPP showed areas of inflammatory resorption, with immunomarcation for tartrate-resistant acid phosphatase. The results suggest that platelets activated with thrombin play an important role in the healing of tissues after tooth replantation. Additional studies are necessary to test other materials, because PRP/Ca did not present an appropriate scaffold for undifferentiated cells in the treatment of avulsed teeth.

Reverse Sandwich Restoration for the Management of Invasive Cervical Resorption: A Case Report

Introduction Invasive cervical resorption (ICR) may occur as a consequence of trauma, orthodontic treatment, intracoronal bleaching, and surgical procedures and may lead to the progressive and destructive loss of tooth structure. The restoration of these resorptive defects is a challenging task because no single restorative material possesses good sealing ability, reinforcement of remaining tooth structure, and biocompatibility simultaneously. Methods This case presented with invasive cervical resorption class 2 (Heithersay) and apical inflammatory resorption caused by trauma in tooth #9. The surgical management of ICR was performed, and, finally, the roots were externally reinforced by filling the resorptive defect with a combination of composite and resin-modified glass ionomer cement, proposed as reverse sandwich restoration (RSR). Results This novel RSR was well tolerated by the periodontal tissues. A follow-up x-ray showed no pathological changes and no recurrence of resorption. Conclusions This case report presents a treatment strategy for root reinforcement that might improve the healing outcomes for patients with invasive cervical resorption.

Clinical study on root resorption of autotransplanted teeth with complete root formation

Introduction The main reasons for the unsuccessful autotransplantation of teeth are the failure of initial healing and root resorption. The aim of this study was to elucidate the relationship between donor teeth factors and the prognosis of the transplants in which root resorption occurred. Materials and methods The study evaluated 110 patients with 117 transplants. The successful group included the cases which healed well, with only minor problems. The unsuccessful group included the cases with transplant-loss and progressive problems. The unsuccessful group and minor-trouble cases were judged with the type of problems; i.e. failure of initial healing, root resorption, and others. Root resorption was classified into 3 types; inflammation resorption, replacement resorption and cervical root resorption. The prognostic factors were evaluated to analyze the difference between rapidly progressing root resorption and the stable resorption. Results There were 20 unsuccessful transplants. In the unsuccessful group, rapidly progressing replacement root resorption was observed in 11 transplants. In the successful group, minor problems such as stable root resorption were found in 16 transplants. At least one of the atypical root shapes (divergent, curve, and hypertrophy), probing pocket depth of more than 4 mm, and/or extrusion were significantly more frequent in the replacement root resorption cases compared to cases with no significant findings. Probing pocket depth of more than 4 mm and/or extrusion, dental caries, history of restoration, root canal treatment were significantly more frequent in rapidly progressing replacement root resorption cases compared to stable root resorption cases. Conclusions Abnormal root shape, deep periodontal pocket, dental caries, restoration and root canal treatment of donor teeth are factors associated with progressive replacement root resorption after the autotransplantation of teeth.

Intentional Replantation: A Procedure as a Last Resort

To address the indications, contraindications, surgical procedure, complications following treatment, factors influencing the results and success rate of intentional replantation procedure. Intentional replantation is extraction of a tooth to do extraoral root canal therapy, curettage of apical lesion when present, and its replacement in its socket. It has been proposed as an alternative to routine extraction; however, it should be considered a last resort because the root may be fractured during extraction. The success rate of intentional replantation is far below than routine endodontic treatment or apical surgery. Difficultness of tooth extraction, the possibility of fracture during extraction and the risk of external resorption are some limitations of this treatment. The most common causes of failure in intentionally replanted teeth are external inflammatory resorption or replacement resorption and ankylosis caused by periodontal ligament damage. The success rate up to 95% with an average retention of 3 to 5 years, has been reported. In some cases, endodontic retreatment or apical surgery is impossible or impractical. In these situations, intentional replantation may be considered as a last resort for preserving the tooth, so all clinicians should know about its indications/contraindications, surgical procedure and complications following treatment.

Tooth Resorption in the Swedish Eurasion Lynx (Lynx Lynx)

The etiology of tooth resorption in the domestic cat remains unknown. The high prevalence and progressive nature of the disease complicates defining healthy control groups. In order to evaluate the possible influence of various life style changes on the prevalence of tooth resorption, healthy control groups are a prerequisite. This paper presents a prevalence study for tooth resorption in a free-ranging wild felidae population. Skulls from 46 free-ranging Eurasian lynx (Lynx lynx) were examined. The age of the animals had previously been estimated based on cementum annuli in the maxillary right canine tooth. The dental examination included both dental probing and radiographic imaging. Complicated fractures of the canine teeth were found in 9/46 (19.5%) skulls. In one fractured canine, apical root resorption and periapical lucency was detected. The root resorption was attributed to inflammatory resorption as a consequence of the initial dental trauma and necrotic pulp. No signs of tooth resorption were found in the remaining teeth. Supernumerary roots were detected in 18/46 skulls (39.1 %). Supernumerary "peg" teeth caudal to the mandibular first molar tooth were detected in 6/46 (13.0%) skulls. Although further studies on dental ultra-structure are needed, the Swedish Eurasian lynx may, in the future, be useful as a healthy comparative model for studies on the etiopathogenesis of tooth resorption in the domestic cat.