The correlation between residual bone height and the ultimate bone height was found to be moderately positive (r = 0.43) and statistically significant (P = 0.0002). There was a moderately negative correlation between residual bone height and the augmented bone height, as evidenced by the correlation coefficient (r = -0.53) and statistical significance (p = 0.0002). Trans-crestally performed sinus augmentations produce uniformly good outcomes, with little disparity in results between experienced clinicians. The pre-operative residual bone height was similarly assessed using both CBCT and panoramic radiographs, demonstrating a high degree of concordance.
Pre-operative CBCT scans revealed a mean residual ridge height of 607138 mm. Similar measurements from panoramic radiographs, yielding 608143 mm, showed no statistically significant disparity (p=0.535). All cases demonstrated a completely uncomplicated course of postoperative healing. By the six-month mark, all thirty implants had achieved successful osseointegration. Operators EM and EG yielded final bone heights of 1261121 mm and 1339163 mm, respectively; the mean bone height was 1287139 mm (p=0.019). Comparatively, the average post-operative bone height increase was 678157 mm, with 668132 mm and 699206 mm for operators EM and EG respectively. A p-value of 0.066 was obtained. Final bone height showed a moderate positive correlation with residual bone height, with a correlation coefficient of 0.43 and a p-value of 0.0002, signifying statistical significance. A negative correlation, of moderate strength, was observed between residual bone height and augmented bone height (r = -0.53, p = 0.0002). Trans-crestally performed sinus augmentation procedures consistently yield favorable outcomes, showing minimal variability in results among experienced clinicians. The assessment of pre-operative residual bone height was consistent between CBCT and panoramic radiographs.
Congenital absence of teeth, whether syndromic or not, in children can result in oral dysfunction, impacting overall well-being and potentially causing socio-psychological issues. A 17-year-old girl in this case presented with severe nonsyndromic oligodontia, demonstrating 18 missing permanent teeth and a class III skeletal pattern. Achieving both functional and aesthetically pleasing outcomes in temporary rehabilitation during development and lasting rehabilitation in adulthood proved to be a considerable challenge. The originality of the oligodontia management process, as detailed in this case report, is presented in two principal sections. A large bimaxillary bone volume enhancement, achieved through LeFort 1 osteotomy advancement coupled with concomitant parietal and xenogenic bone grafting, ensures the potential for early implant placement while minimizing any impact on adjacent alveolar process growth. The conservation of natural teeth for proprioception in prosthetic rehabilitation, coupled with the use of screw-retained, immediate polymethyl-methacrylate prostheses, aims to evaluate the required vertical dimensional changes and improve the predictability of functional and aesthetic outcomes. This article concerning intellectual workflows and the specific challenges encountered in this instance could be useful as a technical note for future management.
Amongst the potential difficulties associated with dental implants, the breaking of any component part is a relatively infrequent, yet clinically significant, problem. Complications of this sort are more common in small-diameter implants owing to their mechanical properties. This investigation, involving both laboratory and FEM methodologies, sought to differentiate the mechanical behavior of 29 mm and 33 mm diameter implants, equipped with conical connections, under controlled static and dynamic conditions, in accordance with the ISO 14801-2017 specifications. The stress distribution on the tested implant systems subjected to a 300 N, 30-degree inclined force was contrasted via finite element analysis. Static tests on the experimental samples incorporated a 2 kN load cell; the force was exerted at a 30-degree angle to the implant-abutment axis via a lever arm of 55 mm. Cyclic fatigue tests were conducted with gradually decreasing load magnitudes, maintaining a frequency of 2 Hertz, until three specimens endured 2 million cycles without exhibiting any signs of damage. antibiotic-bacteriophage combination Finite element analysis of the abutment's emergence profile demonstrated the most significant stress concentration at 5829 MPa for the 29 mm implant and 5480 MPa for the 33 mm implant complex. The mean maximum load measured 360 N for implants with a diameter of 29 mm, and 370 N for those with a diameter of 33 mm. selleck kinase inhibitor The fatigue limit, measured for each instance, was found to be 220 N and 240 N, respectively. Although 33 mm diameter implants yielded superior outcomes, the variations among the tested implants were deemed clinically insignificant. The observed low stress values in the implant neck area, attributable to the conical design of the implant-abutment connection, contribute to improved fracture resistance.
A positive outcome is judged based on satisfactory function, aesthetic appeal, clear phonetics, long-term stability, and few complications. This mandibular subperiosteal implant case report details a remarkable 56-year successful follow-up. Success in the long term was a consequence of many factors, including careful patient selection, adherence to essential anatomical and physiological knowledge, the superior design of the implant and superstructure, meticulous surgical technique, the application of appropriate restorative principles, scrupulous hygiene, and a well-structured re-care schedule. Surgical precision, restorative dentistry expertise, lab technical proficiency, and the patient's enduring compliance are all integral components of the intense collaboration demonstrated in this case. This patient's journey from dental cripple to restored oral function was facilitated by the mandibular subperiosteal implant procedure. This case has a distinctive feature: it represents the longest successful outcome in the entire history of implant treatments of all kinds.
Implant-supported bar-retained overdentures with cantilever extensions, subjected to heightened posterior loading, experience amplified bending moments on the implant abutments adjacent to the cantilever and increased stress within the prosthetic components. This study explores a new abutment-bar structural connection to minimize unwanted bending moments and resulting stresses, a strategy that involves improving the bar's rotational freedom about its supporting abutments. The bar structure's copings were altered to incorporate two spherical surfaces, centered on the top surface of the coping screw head's centroid. Employing a newly designed connection, a four-implant-supported mandibular overdenture was altered to create a modified overdenture. Employing finite element analysis, the deformation and stress distribution were evaluated in both classical and modified models, which showcased bar structures with cantilever extensions at the first and second molar positions. The same analytical approach was applied to the overdenture models without these cantilever extensions. To assess their durability, real-scale prototypes of both models, incorporating cantilever extensions, were constructed, mounted on implants embedded in polyurethane blocks, and put through fatigue tests. Implants from each model were subjected to a pull-out test, assessing their performance. The new connection design improved the rotational freedom of the bar structure, significantly minimized the influence of bending moments, and reduced stress on both cantilevered and non-cantilevered peri-implant bone and overdenture components. Our research confirms the influence of rotational bar mobility on abutments, highlighting the significance of the connection geometry between the abutment and bar as a crucial design element.
This investigation proposes an algorithm for the treatment of neuropathic pain resulting from dental implants, integrating medical and surgical techniques. Leveraging the good practice guidelines established by the French National Health Authority, the methodology was crafted, and the Medline database was consulted for data. In response to a series of qualitative summaries, a working group has prepared a preliminary draft of professional recommendations. An interdisciplinary reading committee's members adjusted the sequential drafts. From the ninety-one publications reviewed, twenty-six were chosen to build the recommendations. The chosen publications comprised one randomized clinical trial, three controlled cohort studies, thirteen case series, and nine individual case reports. Should post-implant neuropathic pain manifest, a comprehensive radiographic evaluation, encompassing at least a panoramic radiograph (orthopantomogram) or ideally a cone-beam computed tomography scan, is advisable to ascertain the implant tip's positioning—more than 4 mm from the mental nerve's anterior loop for anterior implants and at least 2 mm from the inferior alveolar nerve for posterior implants. The early, high-dose steroid protocol, potentially integrated with partial or complete implant removal preferably within 36 to 48 hours following implantation, is considered optimal. Employing a combined pharmacological treatment, consisting of anticonvulsants and antidepressants, could help to curb the risk of chronic pain becoming persistent. If a nerve injury arises from dental implant procedures, expeditious treatment, including the potential for partial or complete implant removal and early pharmaceutical intervention, needs to be initiated within 36 to 48 hours.
Expediency was displayed by polycaprolactone, a biomaterial, in preclinical bone regeneration procedures. γ-aminobutyric acid (GABA) biosynthesis In this report, the authors detail the pioneering clinical use of a custom-designed 3D-printed polycaprolactone mesh for alveolar ridge augmentation, specifically within the posterior maxilla, demonstrated through two cases. Two patients, whose cases necessitated significant ridge augmentation for dental implant procedures, were selected.