Immediate loading of implants inserted through impacted teeth in the aesthetic area: A retrospective study with a mean follow-up period of 7 years.

PURPOSE: To evaluate the survival and success rate of and the incidence of complications affecting implants inserted and immediately loaded in sites where an impacted tooth was present in the maxilla. MATERIALS AND METHODS: A total of 10 patients were treated and 14 implants were inserted, 4 in healed sites and 10 in extraction sites. The implant site preparation started in the crestal bone and continued in the enamel and dentine of the impacted tooth. The radiographic depth of implant penetration into the impacted tooth, peri-implant soft tissue and hard tissue condition at the 1-year follow-up and the last follow-up appointment, marginal bone loss at the 1-year follow-up and the last follow-up appointment, and the final aesthetic result were evaluated. RESULTS: The implants healed uneventfully with an adequate hard and soft tissue response and no adverse clinical or radiographic signs or symptoms. They were in function for a minimum of 3 and a maximum of 11 years (mean 7.2 years). CONCLUSION: Although further studies with a larger sample size are required to validate this unconventional approach, it can be considered a valuable clinical option to replace teeth in an area of impaction.

Benefits of Coronectomy in Lower Third Molar Surgery: A Systematic Review and Meta-analysis.

PURPOSE: The purpose of this study was to measure and compare coronectomy versus extraction in patients at increased risk for inferior alveolar nerve (IAN) injuries associated with third molar removal in terms of IAN injury and other complications. METHODS: The review adhered to the Preferred Reporting Items for Systematic Reviews and Meta-analyses checklist. We conducted a comprehensive literature search across six databases and the gray literature from July 15 to August 01, 2022. We employed Rayyan software to identify and remove duplicate articles to ensure data integrity. Our research followed the strategy patient (P), intervention (I), comparison (C), outcome (O), and study (S): (P) patients needing lower third molar surgery at higher risk of IAN injury; (I) surgery options, coronectomy or complete extraction; (C) comparisons included reduced risks of nerve injuries, postoperative complications (pain, infection, alveolitis), and increased risks of reoperation, root migration, and extraction; (O) desired outcomes were preventing nerve injuries and reducing other surgical complications; and (S) observational study designs (cohort, case-control). Excluded from consideration were studies involving teeth other than lower third molars, as well as reviews, letters, conference summaries, and personal opinions. To gauge the certainty of evidence, we employed the Grading of Recommendation, Assessment, Development, and Evaluation instrument, selecting the most current papers with the highest levels of evidence for inclusion. The primary outcome variable of our study centered on evaluating the incidence of IAN injury, and secondly, the lingual nerve (LN) injury, the postoperative pain, infection, localized alveolitis, the necessity for surgical reintervention, root migration, and extraction. These assessments were carried out with respect to their chosen operative technique for managing third molars, either coronectomy or extraction, as predictor variables. We also considered covariates such as age, gender, and the presence of systemic diseases in our analysis to account for potential confounding factors. The pooled data underwent rigorous analysis utilizing an inverse variance method with both random and fixed effect models by the "metabin" function in the R program's meta-package. Additionally, we assessed the risk of bias in the selected studies by utilizing the Joanna Briggs Institute's Critical Appraisal Checklist for Studies Reporting Prevalence Data and the Critical Appraisal Checklist for Case Reports. RESULTS: Of the 1,017 articles found, after applying the inclusion and exclusion criteria, 42 were included in this study (29 cohort and 13 case-control studies), including 3,095 patients from 18 countries. The meta-analysis showed that coronectomy reduced the risk of IAN injury [OR (Odds Ratio): 0.14; 95% CI (confidence intervals): 0.06-0.30; I2 (inconsistency index) = 0%; P = .0001], postoperative pain (OR: 0.97; 95% CI: 0.33-2.86; I2 = 81%; P = .01), and alveolitis (OR: 0.38; 95% CI: 0.13-1.09; I2 = 32.2%; P = .01) when compared to complete tooth extraction. However, it also highlighted a greater risk of reintervention (OR: 5.38; 95% CI: 1.14-25.28; I2 = 0.0%; P = .01). CONCLUSIONS: This study has demonstrated that coronectomy is associated with a decreased risk for IAN injury and decreased pain and localized alveolitis when compared to complete tooth extraction. However, it is essential to acknowledge the higher likelihood of requiring reintervention with coronectomy. Therefore, clinicians should carefully consider the advantages and potential drawbacks of both techniques and tailor their choices to the unique clinical circumstances of each patient.

Is Injectable Platelet-Rich Fibrin Really Effective in Reducing Expected Side Effects of Removing Impacted Third Molar Surgery?

BACKGROUND: Common side effects of third molar (M3) operations including pain, edema, and trismus have an adverse effect on patient quality of life. Injectable platelet-rich fibrin (i-PRF) may ameliorate some of the side effects of the operation. PURPOSE: The primary purpose of this study is to measure and compare differences in pain, swelling, trismus, and quality of life between i-PRF side and a control side of subjects undergoing M3 removal. STUDY DESIGN, SETTING AND SAMPLE: This study is a single-center, split-mouth, randomized prospective clinical trial conducted at Ordu University Faculty of Dentistry. Patients who presented between March and August 2022 for the extraction of impacted third molars due to various reasons were included in the study. The exclusion criteria were local conditions and systematic comorbidities. Additionally, patients with differences that could cause bias between the sides were excluded from the study. PREDICTOR VARIABLE: The predictor variable is treatment i-PRF or control. MAIN OUTCOME VARIABLE: The outcome variables of interest are the pain level and analgesic consumption values on the Visual Analog Scale, the distance between determined reference points, maximum mouth opening, and the Postoperative Symptom Severity scale data. A Postoperative Symptom Severity scale was created using questions commonly employed in the clinical evaluation of patients following the extraction of third molars. This scale was further divided into subscales corresponding to the 7 primary adverse effects identified in a prior study. COVARIATES: Covariate variables, sex, age, and operation times. ANALYSES: The normality of the distribution of the study data was assessed using the Kolmogorov-Smirnov test. Depending on whether the data exhibited a normal distribution or not, the data were analyzed using either the paired t-test or the Wilcoxon test. A P value < .05 was considered statistically significant. RESULTS: The study included 35 patients with a mean age of 19.97 ± 2.07 years. The i-PRF side significant success in postoperative edema measurements. There was a statistically significant difference observed between the control side and the i-PRF side on the second day (control: 9.74 ± 0.57 mm, i-PRF: 9.46 ± 0.51 mm) and seventh day (control: 9.33 ± 0.59 mm, i-PRF: 9.12 ± 0.50 mm) in lateral canthus-angulus measurements (P: .01 and P: .04, respectively). Additionally, on the second day, there was a statistically significant difference in tragus-commisura measurements (control: 11.53 ± 0.62 mm, i-PRF: 11.31 ± 0.58 mm) with a P value of .02. There was no significant difference observed between the sides in terms of postoperative pain (P > .05). However, analgesic consumption in the i-PRF side was significantly lower at the sixth hour (control: 1.8 ± 0.58 dose, i-PRF: 1.14 ± 0.35 dose), 24th hour (control: 1.77 ± 0.54 dose, i-PRF: 1.14 ± 0.35 dose), and second day (control: 1.8 ± 0.47 dose, i-PRF: 1.4 ± 0.73 dose) postoperatively (P: .000, P: .000, and P: .012). Mouth opening was significantly lower in the i-PRF side on the second day (control: 27.88 ± 6.48 mm, i-PRF: 25.51 ± 5.56 mm) (P: .025). However, i-PRF had no significant effect on postoperative quality of life (P > .05). CONCLUSIONS: According to the study results, i-PRF had a limited effect on the management of postoperative pain, but i-PRF was effective in reducing postoperative edema. Further studies with larger patient sides are now needed to yield more detailed findings on the subject.

Prevalence, etiology, clinical features and management associated with impacted and transmigrated mandibular canines: a systematic review.

BACKGROUND: The occurrence of mandibular canine impaction and/ or transmigration is a rare clinical entity but diagnosis and treatment planning is of clinical significance. The associated etiological factors and the clinical guidelines for the management are still not clear. The aim of this systematic review was to summarize the available data to report the prevalence and identify the etiological factors, clinical features, and various treatment outcomes in patients with mandibular canine impaction and/or transmigration. METHODS: The review protocol was registered in PROSPERO (CRD42021222566) and was conducted and reported according to the PRISMA and Cochrane Handbook / Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement. A computerized search of studies published up to April 30, 2023, was conducted using the following databases: Medline, Cochrane Database of Systematic Reviews, Cochrane Central Register of Controlled Trials, Scopus, Web of Science, and Latin American and Caribbean Health Sciences Literature. A manual search of the reference and citation lists of eligible articles and existing systematic reviews for any additions were also conducted. The Newcastle-Ottawa Scale quality assessment tool was used to assess the studies' quality. RESULTS: After removing 6 duplicates, 3700 articles were identified. For the final analysis, 19 studies published between 1985 and 2023 met all the eligibility criteria and were included. A total of 7 studies presented as good and 12 studies presented as satisfactory. Patients were screened in ten studies and diagnostic records from archives were retrieved in nine studies. The total number of diagnostic records screened was 138.394, and the total number of patients from the included studies was 43.127. CONCLUSIONS: Based on the findings from this systematic review, the prevalence of mandibular canine impaction ranged from 0.008% to 1.29% while canine transmigration from 0.12% to 0.98%. Crowding of the mandibular arch, the presence of a retained deciduous canine, and odontoma or cyst are the etiological factors more commonly associated with mandibular canine impaction and or transmigration. Surgical extraction and surgical exposure followed by orthodontic traction are the two most frequently carried out treatment modalities in the management of mandibular canine impaction and or transmigration.

Dental Anomaly in Hapalodectes dux (Hapalodectidae, Mesonychia) from the Late Paleocene of Mongolia.

The holotype of Hapalodectes dux Lopatin, 2001 from the Upper Paleocene of Mongolia (Tsagan-Khushu locality, Naran Bulak Formation, Zhigden Member) is a lower jaw with complete dentition, showing healed alveoli in place of the right P3. Examination of the holotype using X-ray microtomography revealed a rare dental anomaly previously unknown in fossil mammals, namely the presence of the inverted (positioned upside down and rotated lingual side labially) impacted premolar inside the dentary. The cause of this anomaly may be an aberration of a tooth bud location or an injury.

Orthodontic management of a developing dentigerous cyst related to lower second molar: a case report.

The dentigerous cyst is a developmental odontogenic asymptomatic cyst, that is associated with the crown of an unerupted or impacted tooth. Early diagnosis is important to avoid any future complications and choose the best treatment option. The purpose of this case report is to describe the management of a dentigerous cyst related to lower second molar in a young female patient using orthodontic traction as a conservative treatment approach. This procedure helps to spare the patient an unnecessary surgical excision procedure and the associated excessive bone removal for a safety margin, stimulates bone healing and promotes the eruption of the cyst-associated tooth.

Inverted Maxillary Third Molar Impaction within the Maxillary Sinus: A Rare Case Report.

BACKGROUND The maxillary third molar is considered one of the most impacted teeth and can present in different types based on the direction and depth of the impaction. However, the inverted type of maxillary third molar impaction is a rare condition, with few reported cases in the current literature. CASE REPORT We report an extremely rare case of a 48-year-old man with an inverted maxillary third molar situated in the maxillary sinus in direct contact with the posterior wall of the sinus, with a portion of the coronal part perforating the infratemporal fossa. Because of the anatomical and structural complexity of the impaction and because the tooth has never been symptomatic, the case was conservatively managed after weighing the risks and benefits of surgical intervention. A 2-year follow-up was made to ensure no changes in the impaction location, confirming the validity of the conservative approach. CONCLUSIONS This case is the first reported inverted maxillary third molar impacted in such an anatomical location. This reported case contributes to existing knowledge regarding this rare type of impaction and that this rare impaction location can present congenitally with a non-iatrogenic origin. A thorough dental history and clinical and radiographical examinations will aid dental professionals in their clinical decision making for patients with similar presentations.

Management of Severe Infraocclusion of the Primary Second Molar Leading to Impaction of Second Premolar.

Infraocclusion is a local etiologic factor of malocclusion that can have deleterious effects on normal dental development. Therefore, early recognition and diagnosis are the two most important factors in the management of infraocclusion. The purpose of this case report is to describe the management of a patient who was diagnosed at seven years of age with an eruption disturbance, whose severe sequela could have been prevented had the infraocclusion been diagnosed early.

Removal of mandibular third molars displaced to deep fascial spaces: case reports.

This article reports the treatment of 2 cases of mandibular third molar displacement into deep fascial spaces during attempted extraction, 1 of which resulted in acute infection. In addition to treatment approaches, the article reviews the risk factors for tooth displacement and techniques that may be used for its prevention. In both of the reported cases, after tooth extraction procedures resulted in the displacement of a third molar, the correct location of the tooth was ascertained by 3-dimensional imaging. The displaced tooth was removed via intraoral access while the patient wasunder general anesthesia. Both patients healed without postsurgical complications, confirming the success of the treatment.

Assessment of Dry Socket after Mandibular Third Molar Surgery Using Platelet-Rich Fibrin - A Prospective Clinical Study.

OBJECTIVE:  To determine the efficacy of Platelet-Rich Fibrin (PRF) in preventing Dry Socket (DS) after mandibular third molar surgery in comparison with the control group. STUDY DESIGN: Experimental study. Place and Duration of the Study: Oral and Maxillofacial Surgery Department, Dental Section, Faisalabad Medical University, Faisalabad, Pakistan, from July 2019 to June 2021. METHODOLOGY: Patients aged 18-35 years with good oral hygiene, and requiring surgical extraction of their mandibular third molar were included in the study. Those with periodontal disease, pregnant or nursing women, smokers, or allergic to the agents that were recommended for use before and after surgery, were excluded. Patients presenting for surgical removal of the mandibular third molar and meeting the inclusion criteria were enrolled and randomly divided into 2 groups. Standard protocol for tooth removal was followed in both groups. Group1 (study group) received PRF and group 2 (control group) did not receive PRF. RESULTS: A total of 170 consecutive patients (85/group) were randomly selected and allocated to the study group and control group. The mean age in the study group was 24.28±3.7 years while the mean age in the control group was 24.14±3.64 years. Out of them, 51.2% (n=87) were males and 48.8% (n=83) were females with a M: F of 1:1.05. On the 3rd postoperative day, DS frequency in the study group was 2.4% (n=2) and 18.8% (n=16) in the control group (p=0.0001), which reduced to 01 and 05 respectively on 7th day (p=0.096). CONCLUSION: PRF administration was effective in preventing DS on the third postoperative day in mandibular third molar surgery, with statistically significant results. However, on postoperative day 7, the results were not statistically significant. KEY WORDS: Third molar, Tooth extraction, Dry socket, PRF.

Lingual Nerve Injury During Impacted Mandibular Third Molar Surgery.

OBJECTIVE: To determine the frequency of lingual nerve injury (LNI) during the surgical removal of mandibular third molar and the associated risk factors. STUDY DESIGN: Descriptive study. Place and Duration of the Study: Department of Oral and Maxillofacial Surgery, Ayub Teaching Hospital, Abbottabad, from January to June 2021. METHODOLOGY: A total of 121 patients were included in this study who had undergone impacted third molar surgery. Data were collected on a proforma via interview. Patients were followed up after 1 week, 1 month, and 3 months of duration. Frequency of LNI and its association with various surgical procedure steps were determined. RESULTS: This study shows that out of 121 patients, frequency of LNI was found to be 3.3% (n=4). The type of impaction (p=0.047), lingual flap retraction (p<0.001), tooth splitting (p=0.029), and longer duration of surgery were found to be significantly associated with it. CONCLUSION: The frequency of LNI during mandibular impacted third molar surgery was 3.3% in this study, and significantly associated with horizontal impaction, lingual flap retraction, tooth splitting, and duration of surgery longer than 30 minutes. KEY WORDS: Lingual nerve injury, Tooth, Impaction, Third molar, Lingual flap retraction, Tooth splitting.

Association between maxillary canine impaction and other dental anomalies: radiological study of a mixed dentition children's cohort from an orthodontic clinic.

PURPOSE: To investigate the significance of association between maxillary impacted canines and various dental anomalies. METHODS: Files of 874 orthodontic patients were evaluated for the presence of maxillary impacted canines. From this sample, a group of 97 patients (39 males and 58 females) with at least 1 impacted maxillary canine consisted the study group. This group was compared to a control group of 97 patients (42 males and 55 females) that was created by random selection from the initial sample without maxillary canine impaction. The impaction diagnosis was made from the panoramic radiographs. Chi-square test was used to perform the analysis for significant associations. Stepwise discriminant analysis, binary logistic regression and classification tree were used to identify best combinations. RESULTS: Statistically significant difference was found for peg-shaped maxillary lateral incisors and infraoccluded deciduous molars. The presence of peg-shaped upper lateral incisors arises the probability of impacted canine to 83.3%, a distal displaced unerupted second premolar to 63.16% and the impaction of any other teeth to 80% as showed by the classification tree. CONCLUSIONS: The presence of peg-shaped maxillary lateral incisors and infraocclusion of deciduous molars can be considered major valuable early risk indicators for maxillary canine impaction, because they manifest before the maxillary canine eruption. Special consideration should be given on distal displaced unerupted second premolar and the impaction of any other teeth. Patients with these dental anomalies are candidates for future interceptive treatment for canine eruption.

The Effect of Local Melatonin Application Following the Removal of an Impacted Mandibular Third Molar.

PURPOSE: Pain, swelling, limitation of the mouth opening, development of intra-bony defects, and bone loss are common side effects of removing the impacted third molar. The purpose of this study was to measure the association of applying melatonin in the socket of an impacted mandibular third molar with osteogenic activity and the anti-inflammatory effects. METHODS: This prospective, randomized, blinded trial comprised of patients who required removal of the impacted mandibular third molar. The patients were divided into two groups (n = 19) as follows: melatonin group (3 mg of melatonin into 2 ml of 2% hydroxyethyl cellulose gel was packed into the socket) and placebo group (2 ml of 2% hydroxyethyl cellulose gel was placed in the socket). The primary outcome was bone density, measured using Hounsfield unit immediately after surgery and 6 months later. Secondary outcome variables included serum osteoprotegerin level (Ng/ml) that measured immediately, 4 weeks and 6 months postoperatively. Other clinical outcome measures were pain by visual analog scale, maximum mouth opening (MMO) (millimeter), and swelling (millimeter) that were evaluated immediately, 1, 3, and 7 days postoperatively. The data were analyzed by independent t-test of Wilcoxon's rank-sum, analysis of variance, and generalized estimating equation (P ≤ .05). RESULTS: Thirty-eight patients (25 female and 13 males) with a median age of 27 years were enrolled in the study. There was no statistical significance in bone density observed in both groups [melatonin group: 978.5(951.3-1015.8), control group: 965.8 (924.6-998.7), P = .1]. Alternatively, there were statistically significant improvements in osteoprotegerin levels (on week 4), MMO (on day1), and swelling (on day 3) in the melatonin group compared to those in the placebo group [1.9(1.4-2.4), 39.68 ± 1.35, and 14.36 ± 0.80 versus 1.5(1.2-1.4); 38.33 ± 1.20, and 14.88 ± 0.59; P = .02, .003, 0.031, respectively]. The pain values showed statistically significant improvement throughout the follow-up period in the melatonin group compared to the placebo group [5(3-8), 2(1-5), and 0(0-2) versus 7(6-8), 5(4-6), and 2(1-3); P < .001, respectively]. CONCLUSIONS: The results support the anti-inflammatory effect of melatonin in reducing the pain scale and swelling. Furthermore, it plays a role in the improvement of MMO. On the other hand, the osteogenic activity of melatonin could not be detected.

[Surgical treatment tactics in patients with third molars located close to mandibular canal]. / Taktika lecheniya patsientov pri udalenii tret'ikh molyarov nizhnei chelyusti, prilezhashchikh k nizhnechelyustnomu kanalu.

The tight fit of the roots of the third molars to the mandibular canal is the main predisposing factor of injury to the inferior alveolar nerve during tooth extraction surgery. Surgical treatment of 92 patients diagnosed with pericoronitis, retention of the third molar of the mandible, close fit of the roots of the third molar to the mandibular canal was performed. Four types of close fit of the roots of the third molars to the mandibular canal were revealed, according to CBCT, OPTG and clinical data. Most cases of paresthesia after the removal of the third molars are associated with an anatomical variation in the structure of the mandibular canal, in which the canal walls are partially formed by the cement of the tooth root. Two variants of postoperative management of the surgical wound are proposed, when an open section of the neurovascular bundle is detected at the bottom of the hole.

Extra-oral approach to lower third molar: a rare surgical indication.

The avulsion of the impacted lower third molar is one of the most common procedures in oral surgery. Even though it is characterized by possible complications due to the lesion of lingual and inferior alveolar nerves, the intra-oral surgical approach represents the first-choice strategy when planning surgery. However, in case of ectopic tooth in the mandibular basal bone, it is appropriate to consider an extra-oral transcutaneous surgical approach. The ectopia of the inferior wisdom tooth represents a very rare clinical condition and sometimes it is even unknown by patients and dentists: further evidence of this fact is represented by the paucity of paper related to the topic that can be found in the international scientific literature. The experience of the Department of Maxillofacial Surgery of San Gerardo Hospital in Monza (Italy) in management and treatment of ectopic impacted lower third molar is exposed through the presentation of three cases of ectopic third molar. Two out of three patients, aware of the risks related to the surgical procedure, refused the treatment proposed. One patient underwent surgical avulsion of the wisdom tooth through extra-oral transcervical approach. No early or late complications have been observed. Extra-oral surgical approach for ectopic lower third molar should be considered for selected cases. Given the rarity of the clinical condition and the procedure-related risks, accurate preoperative information has to be provided to the patient by physician and the procedure should only be performed by expert and competent surgeons.

Evaluation of Vitamin D (25OHD), Bone Alkaline Phosphatase (BALP), Serum Calcium, Serum Phosphorus, Ionized Calcium in Patients with Mandibular Third Molar Impaction. An Observational Study.

The aim of this study was to evaluate the levels of vitamin D (25OHD) and other bone biomarkers in patients with third molar impaction (TMI). Thirty males and 30 females with unilateral or bilateral impacted mandibular third molar, and 15 males and 15 females as a control group (CG) were recruited. Rx-OPT was used to evaluate dental position and Pederson index to measure the difficulty of the intervention. Bone biomarkers were measured through blood venous sample in TMI group and CG. Mann-Whitney test, Pearson's correlation coefficient, linear regression model were used to compare the different parameters in the two groups. 25OHD showed lower values in TMI group than in CG (p < 0.05) with values significantly lower in bilateral impaction (p < 0.05). Pearson's coefficient for 25OHD presented a negative correlation with the Pederson index (ρ = -0.75). Bone alkaline phosphatase (BALP) showed significantly lower dosage in TMI group than CG (p = 0.02), Pearson's coefficient for BALP presented a negative correlation with the Pederson index. Serum calcium, serum phosphorus, ionized calcium levels in TMI and CG groups were similar and Mann-Whitney test did not significantly differ between TMI and CG. TMI could be a sign of vitamin D deficiency and of low BALP levels that should be investigated.

Compound odontoma causing impaction of primary tooth in a 4-year-old child: case report / Impacção de dente decíduo por presença de odontoma composto em criança de 4 anos: relato de caso

Objetivo: relatar um caso raro de impacção de um incisivo decíduo inferior pela presença de odontoma composto, bem como descrever a sua abordagem clínica. Relato de caso: paciente do sexo masculino, com 4 anos de idade, apresentava ausência do incisivo lateral decíduo inferior esquerdo. O exame radiográfico mostrou impacção do incisivo não erupcionado próximo a estruturas radiopacas sugestivas de odontoma composto. O paciente foi acompanhado por dois anos, momento em que se realizou abordagem cirúrgica do caso. Após a cirurgia, a hipótese de diagnóstico de odontoma composto foi confirmada e com o acompanhamento ocorreu a erupção dos incisivos centrais permanentes inferiores. O paciente foi encaminhado para tratamento ortodôntico. Considerações finais: esse relato de caso aborda um caso raro de odontoma composto associado à não erupção de dente decíduo, uma vez que odontomas costumam ser detectados preferencialmente na segunda década de vida do paciente, sendo associados à impacção de dentes permanentes. Além disso, apresenta um protocolo de abordagem clínica para esses casos quando diagnosticados em idade precoce no paciente infantil.(AU)

Objective: to report a rare case of impaction of a primary mandibular incisor due to the presence of a compound odontoma and describe its clinical management. Case report: a 4-year-old boy presented with a "missing" primary left mandibular lateral incisor. Radiographs showed impaction of the unerupted incisor by adjacent radiopaque structures consistent with a compound odontoma. The patient was recalled periodically for 2 years, at which time surgical excision was performed. The diagnosis of compound odontoma was confirmed histologically, and the permanent mandibular central incisors erupted uneventfully; the patient was referred for orthodontic treatment. Final considerations: this case report describes an unusual case of compound odontoma associated with an unerupted deciduous tooth; odontomas are rare in this age range, occurring predominantly in the second decade of life and in association with impaction of permanent teeth. We also propose a protocol for clinical management of such early-onset cases.(AU)

Giant follicular cyst with maxillary sinus and pterygomaxillary space extension.

BACKGROUND: Dentigerous, follicular, cysts are developmental odontogenic cysts of reduced adamantine epithelium origin, associated with an impacted tooth. They are the second most frequent cystic pathology after inflammatory cysts. Although the frequency of dentigerous cysts associated with upper third molars is far lower than the mandibular ones, their complications are nothing but ordinary. Most of the times asymptomatic, being discovered during routine x-ray examinations, maxillary follicular cysts can grow to important size, altering the position of adjacent teeth, producing osteolysis of the nearby bone structures, as well as infectious complications, antral and orbital pathology. CASE REPORT: The present manuscript describes the clinical, radiological, pathological and therapeutical aspects of a giant follicular cyst with antral and pterygomaxillary extension, associated with an impacted upper third molar. CONCLUSION: The most efficient treatment of maxillary follicular cysts consists in the surgical removal of the lesion along with the involved tooth. Complete excision is mandatory to prevent recurrence. Extension into adjacent structures might complicate the surgery Preoperative evaluation and rigorous planning are essential, especially in large-sized lesions. Pathological examination is outmost importance in order to exclude aggressive transformations. KEY WORDS: Dentigerous follicular cyst, Maxillary sinus extension, Pterygomaxillary space.

Impactación Canina Maxilar y Reabsorción Radicular de Dientes Adyacentes: Un Análisis a Través de Tomografía Computarizada Cone-Beam / Canine Maxillary Impaction and Root Resorption of Adjacent Teeth: An Analysis through Cone-Beam Computed Tomography Analysis

RESUMEN: Uno de los problemas con mayores consecuencias tanto estéticas como funcionales en ortodoncia es la impactación de caninos maxilares (ICM) siendo principal motivo de reabsorciones radiculares de dientes adyacentes. Actualmente se carece de estudios que describan la reabsorción radicular por ICM a través de tomografía computarizada conebeam (TCCB) en la población chilena. El objetivo del estudio fue describir a pacientes entre 8 a 18 años, que presentan ICM (o riesgo de ella), tanto en las características de la impactación canina como en la reabsorción radicular presentada en incisivos laterales (IL) y en otros dientes adyacentes. En este estudio retrospectivo, 135 datos de TCCB fueron seleccionados por conveniencia, de los cuales 181 caninos presentaron ICM. Fueron analizadas las variables edad, sexo, tipo de ICM (unilateral o bilateral), localización bucolingual (vestibular o palatino), lado de impactación (derecho o izquierdo), reabsorción radicular en el incisivo lateral y registro de el o los dientes anexos afectados por reabsorción radicular (incisivo central y/o premolares). Además en el caso de reabsorción de IL fue analizada la reabsorción tridimensionalmente a través de la ThreeDimensional Leeds Orthodontic Root Resorption Target Scale (3D-LORTS). La ICM en la muestra seleccionada tuvo una edad promedio de 12 años, una relación por sexo mujeres:hombres de 1,5:1, frecuentemente de tipo unilateral, en el lado derecho y una localización bucolingual palatina (64,1 %) por sobre la vestibular (35,9 %). La reabsorción radicular alcanzó un 35,9 %, de la cual un 27,6 % involucró a IL y un 8,3 % en dientes anexos adyacentes. En cuanto a la distribución tridimensional de la reabsorción radicular, la más frecuente involucró el tercio apical (60 %), con compromiso pulpar o severo (40 %), involucrando solo una cara, la palatina (54 %). Ninguna de las variables anteriores consideradas, demostró diferencias estadísticas con la reabsorción radicular de incisivos laterales.

ABSTRACT: One of the problems with greatest aesthetic and functional consequences in orthodontics is the Impaction of Maxillary Canines (ICM) being the main reason for root resorption of the adjacent teeth. Currently there are no studies describing root resorption by ICM through cone beam computed tomography (CBCT) in the Chilean population. The main objective of the study was to describe patients between 8 and 18 years old, who presented with ICM (or risk thereof), with the characteristics of canine impaction as well as root resorption presented in lateral incisors (IL) and in other adjacent teeth. In this retrospective study, 135 CBCT subjects were selected for convenience, of which 181 canines presented ICM. The variables were analyzed: age, sex, type of ICM (unilateral or bilateral), buccolingual location (vestibular or palatal), side of impaction (right or left), root resorption in the lateral incisor and registration of adjacent teeth affected by resorption radicular (central incisor and/or premolars). In addition, when reabsorption of IL was observed, three-dimensional analysis was made using the Three-Dimensional Leeds Orthodontic Root Resorption Target Scale (3D-LORTS). The ICM in the selected sample had an average age of 12 years, a ratio by sex of women:men of 1.5:1, frequently of unilateral type, on the right side and with palatine buccolingual location (64.1 %) above the vestibular (35.9 %). Root resorption reached 35.9 %, of which 27.6 % presented in the IL and 8.3 % in adjacent teeth. Regarding the three-dimensional distribution of root resorption, the most frequent involved the apical third (60 %), with pulpal or severe damage (40 %), in only one location, the palatine (54 %). None of the above variables considered showed statistical differences with the root resorption of lateral incisors.

Evaluation of the relationship between gonial angle and impacted mandibular third molar teeth.

Mandibular third molar teeth have the highest impaction frequency for several reasons such as lack of space which may be related to the direction of facial growth. Gonial angle is used for the definition of facial growth pattern with some other measures such as mandibular plane angle. Winter and Pell-Gregory classifications are used for defining the level and pattern of mandibular third molar impaction. The aim of this study is to define the relationship between mandibular third molar impaction pattern and gonial angle; also to evaluate relationship between mandibular third molar roots and inferior alveolar canal. Study included 90 patients who had undergone cone beam computed tomography assessment for mandibular third molar impaction. Impacted teeth were grouped according to Pell-Gregory depth (A, B, C) and ramus (1, 2, 3) classification and sub-groups were composed. Winter classification was used for angulation of third molars and their relationship between with inferior alveolar canal was recorded. Gonial angle was measured on panoramic radiographs. Of the evaluated 90 impacted third molars, mesioangular position was the most frequent (34.4%), followed by vertical, horizontal and distoangular positions. Nearly 77% of the impacted third molar roots were related to inferior alveolar canal. While no correlation was determined between gender, age, third molar angulation and gonial angle, C2 sub-group of Pell-Gregory classification showed statistically significant higher gonial angle values. Although no significance was found, gonial angle was higher in level C group. In conclusion, gonial angle is higher in patients with C2 impaction level. Also, although statistically insignificant, Pell-Gregory C group had higher gonial angle averages.