Search Results (16)

Mandibular dental disease is common in pet rabbits and often requires invasive procedures associated with significant nociceptive input. Mandibular alveolar nerve blocks have been described in this species using blind techniques; however, their accuracy has not been objectively evaluated, and ultrasound-guided approaches have not been reported. This cadaveric study aimed to describe an ultrasound-guided mandibular alveolar nerve block in rabbits and to compare in-plane and out-of-plane approaches. Twelve adult New Zealand White rabbit cadavers (24 mandibular alveolar nerves) were included. For each rabbit, one nerve was assigned to an in-plane ultrasound-guided approach, while the contralateral nerve was assigned to an out-of-plane approach. Following ultrasound-guided needle placement, 0.1 mL/kg of a mixture of 2% lidocaine and 1% methylene blue was injected. Ultrasound image quality and perineural staining were assessed and scored, and longitudinal dye spread was measured after anatomical dissection. Both approaches allowed consistent identification of the target region and resulted in comparable ultrasound image quality scores, staining scores, and longitudinal dye spread, with no statistically significant differences between techniques. These results demonstrate the anatomical feasibility of ultrasound-guided mandibular alveolar nerve blocks in rabbits using either approach. Further in vivo studies are required to assess clinical efficacy and safety. Full article

Background/Objectives: The mandibular lingula (ML) is a small bony projection on the medial surface of the ramus and serves as the first reference point identified during sagittal split ramus osteotomy (SSRO) or inferior alveolar nerve block (IANB). Anatomical variations in the mandibular ramus have been shown to exist across different populations. Understanding these population-specific differences enhances both clinical safety and diagnostic precision. However, there is a paucity of anthropological data amongst the Mongoloid population, especially in Southeast Asia. Hence, this study aimed to investigate the (i) distance of the lingula to different mandibular anatomical landmarks and its localization, (ii) lingula shape, and (iii) differences between gender and the sides of the mandible amongst the local ethnic groups. Methods: This retrospective cross-sectional study consisted of 206 cone-beam computed tomography (CBCT) images of 77 males and 129 females (mean age 33), with a total of 412 hemimandibles. Measurements were performed on three-dimensionally reconstructed CBCT images. Results: The most common shape was the truncated type. The distance of the lingula to the anterior (LiA), posterior (LiP), superior (LiS), and inferior (LiI) borders of mandible were 17.84 (2.25) mm, 14.46 (3.44) mm, 17.73 (3.00) mm, and 27.05 (4.40) mm, respectively. No significant difference exists between the sides of the mandible. Sexual dimorphism existed for all lingula measurements except LiA. Indians have smaller rami with more anteriorly and inferiorly placed ML than Malay and Chinese. The majority of ML was located 8.55 mm above the occlusal plane. Conclusions: This study provides information on the ML and its surrounding ramus structure in the local population. Such variations must be accounted for in SSRO and IANB. Full article

The use of local anesthetics in dentistry is crucial for pain control. Their efficacy may be related to multiple factors, including gender, the clinical status of the patient, anatomical factors, the type of anesthetic, premedication treatment, and the experience of the professional. Aim: The objective of this study was to analyze whether premedication or the degree of patient anxiety influences the anesthetic efficacy of 4% articaine with epinephrine 1:100,000 and 0.5% bupivacaine with epinephrine 1:100,000 in patients undergoing root canal treatment for symptomatic irreversible pulpitis in the upper and lower molars. The null hypothesis (H0) of this study was that articaine and bupivacaine would have a similar anesthetic efficacy when used during the treatment of symptomatic irreversible pulpitis of the posterior mandibular and maxillary teeth, independent of non-steroidal anti-inflammatory drugs (NSAIDs) premedication or the patient’s anxiety levels. Methods: A total of 140 patients presenting with pulpitis in the upper and lower molars were randomly assigned to one of two anesthetics: articaine or bupivacaine. Before root canal treatment, patients completed the Modified Corah Dental Anxiety Scale (MDAS) and a Visual Analog Scale (VAS) for pain intensity. Inferior alveolar nerve block was performed for the lower molars and buccal infiltration for the upper molars, and the anesthetic efficacy was verified by the Endo Coldspray^® test. During the procedure, the patients’ heart rate and oxygen saturation were monitored using a pulse oximeter. The patients reported their pain levels using a VAS twenty-four hours postoperatively. Results: High levels of dental anxiety were significantly associated with higher pain scores (p = 0.000) for both groups. The hemodynamic changes during treatment remained within normal limits. The need for anesthetic reinforcement was higher in the bupivacaine group (p = 0.004). The patients in both groups reported low-intensity postoperative pain, although the pain level was slightly lower in the bupivacaine group. Conclusions: The anesthetic efficacy of articaine and bupivacaine in patients with irreversible pulpitis did not appear to be influenced by the degree of anxiety or the intake of AINEs as premedication. The intrinsic anesthetic efficacy was higher for articaine, which required less reinforcement than bupivacaine. Comparing the results obtained when performing buccal infiltration and inferior alveolar nerve block further highlighted the differences between the two anesthetics; these differences were more pronounced in the bupivacaine group, leading to rejection of the null hypothesis proposed at the beginning of the study. Full article

Background/Objectives: One of the most serious complications following implant placement in the atrophic posterior mandible is injury to the inferior alveolar nerve (IAN), which can also happen during occlusal loading of the implants. This study investigates the effects of 4 mm implant stress transmission to the inferior alveolar nerve during occlusal loading in cases of severe posterior mandibular atrophy. Methods: The computer-aided design (CAD) model was created and modified through Direct Modeling techniques. The structure of cortical and trabecular bones was simplified, and it was modeled as a cylinder block. Finite element analysis (FEA) was carried out in 3D to investigate the pressure distribution over the IAN at different implant-to-nerve distances (1.5 mm, 0.5 mm, and 0.1 mm), and stress and strain deformations were simulated in the mandibular model. Results: The results of the pressure analysis on the inferior alveolar nerve indicate that the pressure distribution at different implant-to-nerve distances (1.5 mm, 0.5 mm, and 0.1 mm) is consistently below 0.026 MPa, which corresponds to the maximum pressure range that may block nerve impulses. This occurs even at the theoretical and simulated distance of 0.1 mm, suggesting that cortical bone stiffness plays a crucial role in mitigating stress at reduced implant-to-nerve proximities. Conclusions: Within the limits of this study, ultra-short implants can be placed even less than 0.5 mm (up to 0.1 mm under the 3D-FEA hypothesis) above the inferior alveolar nerve under the 3D-FEA hypothesis, while maintaining pressure below the threshold value. This is due to the rigidity of the cortical bone, which helps to reduce pressure transmission to the nerve. These findings may expand the indications for ultra-short implants, even in mandibles with a residual bone height of just 4 mm. Full article

Background: Irreversible pulpitis is a severe inflammation of the dental pulp. The purpose of this clinical trial was to evaluate the effectiveness of an inferior alveolar nerve block (IANB) injection followed by oral dexamethasone administration in reducing the pain associated with symptomatic irreversible pulpitis (SIP) in mandibular molars, without performing conventional pulpotomy. Methods: A sample of 80 subjects suffering from acute pain due to SIP on a mandibular molar were assigned to the dexamethasone group, who received an IANB injection followed by one oral dose of 4 mg of dexamethasone during the emergency visit followed by one dose of 4 mg after 8 h, or the control group, who received a conventional pulpotomy. Both groups received complete endodontic treatment after five to six days. The intensity of the preoperative pain and pain levels were measured in both groups at different times after each intervention. The Mann–Whitney U test was used to compare the pain scores between the groups at the same time point, while Friedman’s test was used to compare the pain scores between the four time points within the same intervention group, followed by the Bonferroni correction for multiple pairwise comparisons. Success was determined when the pain score on the visual analogue scale (VAS) was 20 or lower. Results: A survival analysis was conducted, where the event was considered as the disappearance of symptoms (or success: pain score ≤ 20). For both groups, the pain significantly decreased 8 h postoperatively (p < 0.05). The success rates at 8 and 12 h were significantly higher in the dexamethasone group compared to the control group (p = 0.05). However, the pain scores at 24 h remained comparable. Conclusions: An IANB injection followed by 8 mg of oral dexamethasone could reduce pain significantly in patients with SIP without performing conventional pulpotomy. The oral administration of dexamethasone could therefore be a valuable strategy to temporarily alleviate SIP symptoms until definitive treatment becomes feasible. Dexamethasone is a temporary pain management strategy rather than a replacement for pulpotomy. Full article

Background/Objectives: Effective pain control in pediatric dentistry combines behavior management, local anesthesia, and follow-up care. This study compared the efficacy of inferior alveolar nerve block (IANB) with 2% lidocaine and epinephrine versus buccal infiltration (BI) with 4% articaine and epinephrine in treating primary molars, permanent premolars, and molars in children. Methods: Sixty children aged 5–18 years were randomly assigned to two groups in a double-blind study. One group received 1.7 mL BI with 4% articaine, and the other 1.8 mL IANB with 2% lidocaine for dental treatment. Pain was assessed using the self-reported Visual Analog Scale (VAS) and Wong–Baker Faces Pain Rating Scale (W-BFRS), while anesthesia effectiveness and behavior were evaluated using the Frankl Behavior Rating Scale (FBRS) and vitality tests. Results: The articaine group reported significantly lower pain scores on all scales (VAS: 1.23 ± 2.01; FBRS: 0.47 ± 0.57; W-BFRS: 1.33 ± 2.04) than the lidocaine group (VAS: 3.17 ± 1.64; FBRS: 1.26 ± 0.45; W-BFRS: 3.17 ± 1.64). Articaine also outperformed lidocaine in secondary measures, with higher positive responses on the questionnaires (articaine: 8.37 ± 1.61 vs. lidocaine: 5.27 ± 1.41, p < 0.001). Conclusions: Buccal infiltration with 4% articaine is more effective than 2% lidocaine administered via IANB for invasive dental procedures in children, providing superior pain control and positive patient responses. Full article

Background/Objectives: The aim of this study is to identify the most accurate and consistent landmarks for determining the precise location of the mandibular foramen (MF) and the mandibular ramus, suggesting appropriate adjustments to anesthesia techniques based on these variations in order to improve the success rate of the inferior alveolar nerve (IAN) block. Methods: CT scans of the mandibles from 100 patients were analyzed to measure the distance between the MF and various landmarks, including the sigmoid notch, gonion, posterior and anterior margins of the ramus, temporal crest, and the mandibular ramus height from the condyle to the gonion. The width of the mandibular ramus was also assessed, with correlations made to age and gender. Results: The MF was found to be closer to the sigmoid notch (mean = 21.2 mm), p = 0.393, than to the gonion (mean = 22.6 mm), p = 0.801, and closer to the posterior margin of the ramus (mean = 13.1 mm), p = 0.753, than to the anterior margin of the ramus. Additionally, the MF was closer to the temporal crest. Age also influenced the position of the MF, with a posterior and superior movement of the foramen, reducing the distance between the MF and the posterior margin of the ramus as well as the MF and the sigmoid notch (p < 0.001). Conclusions: A precise understanding of the MF’s location will help dentists and oral and maxillofacial surgeons improve the success of the IAN block, avoid injury to the inferior alveola neurovascular bundle, and minimize surgical complications such as paresthesia, permanent anesthesia, and hemorrhage. Full article

Background and Objectives: the mandibular foramen is an essential anatomic landmark in performing various dental and surgical procedures, including inferior alveolar nerve block (IANB). However, its position may vary based on the individual morpho-functional features of the skull and face. This study aims to conduct a personalized assessment of the location of the mandibular foramen in various shapes of skulls, faces, and mandibles. Materials and Methods: this anatomic morphometric cross-sectional study was performed using one hundred and six (n = 106) certified human cadaver heads of both sexes. The cranial index (CI) and Izard’s facial index (FI) were calculated, the linear anatomic parameters of the skull and mandible were measured, the location of the mandibular foramen was identified, and the shapes of the skulls and mandibles were determined. Quantitative statistical data were obtained based on the location of the mandibular foramen, considering different shapes of skulls and faces. Results: there is a significant correlation between the location of the mandibular foramen, the high lengthy index (HLI) of the mandible, and the longitudinal latitude index (LLI) of the mandibular process. Conclusions: personalized assessment of the mandibular foramen based on a comprehensive analysis of craniometric characteristics can contribute to preventing unwanted dental and surgical complications, such as inferior alveolar nerve damage. Full article

Background/Objectives: Locating the mandibular foramen (MF) through imaging is clinically important for inferior alveolar nerve (IAN) anesthesia and mandibular ramus osteotomies. Although cone-beam computed tomography (CBCT) is superior in imaging the mandible, an orthopantomogram (OPG) is preferred for its ease of use and availability. Therefore, the present study aimed to evaluate the accuracy of digital OPG in localizing the MF, in a subset of the Middle Eastern population. Methods: Radiographic images (OPG and CBCT) of selected patients (adults, dentulous and no mandibular abnormalities) were used to locate the MF through digital measurements (mm) of the anteroposterior distance from the anterior border of the ramus (MF-AP) and the superoinferior position from the mandibular occlusal plane (MF-SI). Measurements were statistically compared between OPG and CBCT for accuracy. Differences in measurements between OPG and CBCT were compared against the anatomic location (right/left), age and biological sex, assuming a p-value < 0.05 as significant. Results: A total of 204 radiographic records (males: 100/females: 104/mean age: 34.65 ± 11.55 years) were evaluated. The measurements for the MF were MF-AP-OPG (right: 13.53 ± 2.44/left: 13.19 ± 2.25), MF-AP-CBCT (right: 13.61 ± 2.39/left: 13.36 ± 2.19), MF-SI-OPG (right: 5.25 ± 1.71/left: 5.41 ± 1.65) and MF-SI-CBCT (right: 5.59 ± 1.66/left: 5.52 ± 1.61). Measurements between OPG and CBCT were not significantly different, except for MF-SI (right) (p = 0.042). While the overall difference between OPG and CBCT (MF-AP/MF-SI) measurements showed a significant association (p < 0.01) with the anatomic location (right/left), a significant association (p < 0.05) with biological sex was observed only for MF-AP. Conclusions: Based on this study’s outcomes, digital OPG is an accurate modality to locate the MF based on anteroposterior (MF-AP) and superoinferior (MF-SI) measurements. This would be clinically beneficial for dental and oral surgeons to achieve the optimum IAN block anesthesia based on preoperative panoramic radiographs. Similarly, it would assist maxillofacial surgeons in planning mandibular orthognathic surgeries and ramus osteotomies without complications. Full article

Inferior alveolar nerve block (IANB) is one of the most common procedures in operative dentistry, and a deep understanding of the normal anatomical variation of the pterygomandibular space (PM) is essential for its safe and successful administration. This cadaveric anatomical study aimed to use A-silicone injections to evaluate the volume of the PM. This study was conducted using 46 human cadaver heads (25 males and 21 females). A craniometric analysis was performed using the cadavers’ ages, the number of silicone cartridges (carpules) used to fill the pterygomandibular space, Izard’s Facial Index (FI), and the Cranial Index (CI). A Halstead mandibular block was performed by injecting 1.7 mL A-silicone cartridges (as an equivalent to standard local aesthetic carpules volume) into the PM. The cured silicone was extracted from the dissected mandibles. The volume (length, width, and thickness) of the extracted silicone and the number of silicone cartridges used to fill the space were evaluated. The results showed that there are statistically significant positive correlations between the CI and the width of the right PM, as well as the width and length of the left PM. A statistically significant correlation was found between the width of the left PM and the age of the cadaveric heads; the higher the age, the thicker the space on both sides. The volume of the PM corresponded to 1.5 cartridges on average. Full article

Background and Objectives: Lidocaine Hydrochloride has been the standard choice for local anesthesia in dentistry and Articaine’s unique structure and growing popularity make it a viable alternative. Due to contradictory results in prior research and a scarcity of trials conducted in the Pakistani population, this study aims to compare the anesthetic efficacy of Lidocaine with Articaine for inferior alveolar nerve blocks in patients with symptomatic irreversible pulpitis. Materials and Methods: This double-blinded, randomized controlled trial included 152 patients who were selected by consecutive non-probability sampling. The participants included patients who presented with symptomatic irreversible pulpitis in mandibular posterior teeth (molars and premolars) and depicted normal apical tissue radiographically. The patients were equally and randomly divided into two groups. The control group received 2% Lidocaine Hydrochloride injections, and the experiment group received 4% Articaine Hydrochloride injections. Participants scored their pain on the HP-VAS both before and after the administration of anesthesia. A value of 54 mm or less on the scale indicated effective anesthesia. The data obtained were analyzed using SPSS. Chi-square test was applied to analyze data for statistical significance. Results: There was no statistically significant difference in the efficacy of the two anesthetic agents. During access cavity preparation, Lidocaine demonstrated a success rate of 93%, whereas Articaine exhibited a slightly higher success rate of 97%. During initial instrumentation, the success rates for Lidocaine and Articaine were 72% and 71%, respectively. This suggests that both Lidocaine and Articaine were effective in achieving anesthesia during the dental procedure in patients with symptomatic irreversible pulpitis, with Articaine showing a slightly better success rate, although the difference was not statistically significant. Conclusions: The anesthetic efficacy of Articaine is similar to that of lidocaine in subjects with symptomatic irreversible pulpitis. Hence, Articaine can serve as an alternative to Lidocaine for local anesthesia administration in dentistry. Full article

This study aimed to review the literature on adult mandibular lingula (ML) locations and related distances determined using cone-beam computed tomography (CBCT). A search was conducted for studies on CBCT using the following databases: PubMed, Web of Science, and Embase. The search results were limited to studies published between 1970 and 2021. The inclusion criteria were the investigation of ML location, CBCT, and participants aged ≥18 years. Eligible studies were examined for the distances from the lingual tip to the anterior ramus border, posterior ramus border, sigmoid notch, inferior ramus border, and occlusal plane. Eight studies on CBCT qualified for inclusion in the study. The mean distances from the ML to the anterior ramus border were 15.57 to 20 mm. In most of these, the ML was located above the occlusal plane. No significant differences were observed in the location and related distances for the ML among patients of different sexes, ethnicities, or skeletal patterns. Full article

Accomplishing painless endodontic treatment, especially in the mandibular molar region, is challenging. Hence, the aim of the study was to compare the efficacy of 2% lidocaine and 4% articaine when used as supplemental intra-ligamentary (IL) anesthesia in mandibular molars having symptomatic irreversible pulpitis with symptomatic apical periodontitis after failed Inferior Alveolar Nerve Block (IANB) injection. In this prospective study, one-hundred and forty-seven adult patients diagnosed with irreversible pulpitis in a mandibular tooth were included who received IANB with 1.8 mL of 2% lidocaine with 1:100,000 epinephrine. Patients who experienced pain were recorded using the Heft–Parker visual analog scale (HP-VAS score ≥ 55 mm) and received supplement intra-ligament injection with either4% articaine or 2% lidocaine with 1:100,000 epinephrine. Supplementary intra-ligament injections resulted in 82.6% and 91.3% of profound anesthesia in the first molar region for 2% lidocaine and 4% articaine, respectively. Similarly, an additional IL injection of articaine success percent (78.9%) in the second molar region was higher than lidocaine (63.1%). The overall success ratio revealed no significant difference in achieving profound anesthesia of either solution. In this study population, there was no difference in the success ratio of anesthesia between 2% lidocaine and 4% articaine when used as supplemental IL injection. Full article

Background: the position of the mandibular lingula (Li) affects the success rate of the inferior alveolar nerve block (IANB) and ramus osteotomies. This study evaluated the position of the Li, to investigate the anatomical relationship between the Li and some anatomical measurements using cone beam computed tomography (CBCT). Methods: 201 hemimandibular CBCTs of 111 patients (43 males and 68 females; 18 to 88 years old) were retrospectively evaluated. The Li location was determined from the lingula tip to: the occlusal plane, the anterior and posterior borders of the mandibular ramus, the lower border of the mandible, the distal surface of the mandibular second molar, and the mandibular notch. We evaluated the correlations between the Li and the anteroposterior diameter of the mandibular ramus; the vertical distance between condyle and mandibular angle; the mesial–distal diameter of the first, second, and third mandibular molar, the intercanine distance, the intermolar distances among the first, second, and third mandibular molars; the distance between the intermolar line of the first molar and midline, and the length of the mandibular body. Results: the vertical distance of the Li from the occlusal plane was 11.22 ± 4.27 mm. Some parameters significantly correlated with the anatomical measurements taken into consideration. Conclusions: the present study provides new information concerning the Li and mandibular anatomy in the Italian population. Moreover, by correlating some anatomic measurements to the Li position, the localization of the Li is made possible, indirectly through the measurement of some distances between anatomical landmarks. Full article

Human body dissection was a ubiquitous practice in the past, to better understand anatomy and to develop medicine. Today, its role could still be important to answer everyday clinical queries and help surgeons. The example of the possible lack of anesthesia during symphysis surgeries can emphasize the usefulness of dissection. The mandibular symphysis usually receives innervation from inferior alveolar nerve terminations, but, in some rare cases, a particular anastomosis involves the lingual nerve and the nerve to the mylohyoid. The anatomical knowledge resulting from body dissections could help oral surgeons to understand the reason why the patient could feel pain during the surgery, and ensure performance of the right lingual nerve block to obtain complete anesthesia. This clinical situation shows the educational role of an ancient, yet still valid, practice, human dissection, and the importance of anatomical studies to improve surgical skills, to provide better treatment for the patient. Full article