Mandibular molar teeth deviations for fabrication of implant-specific strip crowns among Indians.

An understanding of tooth morphology provides better insight and is an important foundation for providing successful endodontic and restorative treatment. It also provides a deeper evaluation and baseline for future prosthetic rehabilitation. The study aimed to measure and characterizes mandibular molars using a normal divider and measurement scale using mandibular casts. Over 300 mandibular first molars were measured in dimensions including the buccolingual width, mesiodistal width, mesiobuccal height, mid-buccal height, and distobuccal height; same were repeated with intra-oral scanners digitally. The mean and standard deviation of the measurements and the correlation to age and gender were calculated using SPSS software to fabricate implant-specific strip crowns.

Feedback on dental implants with dynamic navigation versus freehand.

The Aim of the study is to understand and identify if Dynamic Navigation (DN) has an upper hand to provide ease and comfort to the patients during and after surgery. 60 patients requiring 120 Implants, were randomly allocated in 2 groups (Group 1- Freehand surgery, Group 2- Dynamic navigation surgery) requiring dental implant therapy. Patients in both the groups were given a Patient satisfaction questionnaire assessing the following domains: comfort, fear, prior experience with robotics, dental anxiety and pain perception. Patient related Experience measures (PREM's) were assessed using the following domains: experience with robotics, pain perception and comfort of using various instrumentations during the surgery. The pre and post CBCT were compared using EVALUNAV application of the Navident software. There was significant difference (p<0.05) between the two groups in the patient outcomes pertaining to the future of robotics in medicine (group 1: 2±1.259, group 2 :4.8±0.484) and Patients reliability to a specific procedure due to the less surgical time taken (group 1:3.3±0.651, group 2: 4.63±0.556). The post-operative pain between the groups was also assessed with VAS scale.

T-scans in implant procedures.

T scans are a breakthrough in technology which allows the user to accurately analyze the occlusion of a patient with minimal to zero errors. They are used during prosthodontic rehabilitation to map out the patient's occlusion to plan for replacements. Such a high advancement in technology has a backdraw. The cost of the equipment is a concern for simple dental practitioners. There are no large scale studies using T scans in determining the occlusion. Therefore, it is of interest to analyze the use of T scans in determining the percentage of contact in patients with dental implants. This retrospective analysis was done at the Saveetha University hospital set up where patients undergoing prosthesis fabrication for implants were included. Details like their age, gender and the percentage of contact of the implant and percentage of contact on the adjacent tooth were recorded. These details were tabulated and imported to IBM SPSS version 23 for statistical analysis. Chi square test was used to analyze comparable variables. 22 patients were analyzed, the mean percentage of contact of implants was found to be 7.45±;9.01 and the mean percentage of contact of adjacent teeth was found to be 10.14±6.7. Thus, T scan is an efficient method in recording the dynamic occlusal contacts of a patient. The use of T scan reveals data pertaining to individual tooth but in the present study there is no statistical significance in terms of exact values comparing implant contact to adjacent tooth contact. Further studies are needed with relation to timing and contact surface of implant prosthesis.

An Analysis of Implant Prosthesis and Its Dynamic Occlusal Contacts.

The prosthetic replacement is achieved for the functional aspect of the stomatognathic system. Achieving prosthetic occlusion is challenging and has an occlusal concept of its own when the type of prosthesis varies. The implant occlusion differs for its load transfer concept and longevity. The study was employed to assess the dynamic occlusal contact in implant occlusion through digital means. The study was carried out on implant prosthesis and its dynamic parameters were evaluated using T-Scan Novus (BioResearch, Inc., Brown Deer, WI, USA) in a university hospital setting after collecting 35 patients. Mandibular arch prosthesis tends to swing from high intensity to low or no contacts frequently and when the percentage of implant crown contact at 10% is present there is more of implant protected occlusion achieved. Use of T-Scan Novus can reveal more occlusal details in functional form which can help in achieving new treatment goals.

An Analysis of Mean Bone Availability on the Choice of Implant Width and Length.

Success of dental implants depends on the quality and quantity of local bone, implant designs, and surgical technique. The amount and density of available bone in the patient's edentulous site are primary determining factors in predicting individual patient success. Our present study aims to analyze the mean bone availability to the choice of implant width and length and bone width and length compared with the adjacent teeth and condensing osteitis. This descriptive study was done at the Saveetha Dental College and Hospitals, Chennai. Retrospective data of bone width, bone height, implant width, implant height, adjacent teeth presence, and condensing osteitis presence were evaluated from the digital data to assess operators' implant dimensional choice. Residual bone height availability is in the range of 0-2 mm (about 52.1%). Residual bone width availability is in the range of 0-2 mm (about 56.9%). Presence of adjacent teeth is 79.8% and presence of condensing osteitis is 12%; these results were subjected to chi-square test. Presence of adjacent teeth tends to dictate the choice of width of implant whereas the length of implant is not much changed from planned length and width.

Effect of Submandibular Fossa on Implant Length in the Posterior Mandibular Region.

This retrospective study aims to evaluate the association between submandibular fossa anatomy and implant length in the posterior mandibular region. The study took place from June 1, 2019 to March 1, 2020, during which 295 implants were placed in the posterior mandibular region. Data were reviewed and analyzed from 86,000 patient records that were documented at a private institution. Statistical analysis was performed to assess the association between submandibular fossa anatomy and implant length in the posterior mandibular region. Of the 295 implants, 29.2% were placed in subjects aged 36-45 yr, and 52.9% were male. Of the total population, 52.2% had type P (parallel) submandibular fossa anatomy. The 10-mm implant was the size that was most commonly used (frequency rate, 60.3%). A prevalence of submandibular fossa according to gender showed that 53.8% of males and 50.4% of females had type P (parallel buccal and lingual) plates. A statistically significant difference was found when comparing implant length to different types of submandibular fossa by gender (p < 0.05). And, when association was compared between types of submandibular fossa and implant length, a statistically significant association was found. We conclude that high risk occurs when implants are placed in the mandibular posterior region, because many complications can arise. Proper treatment planning is necessary after complete evaluation using cone-beam computed tomography.