Notes

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The purpose of this prospective clinical study was to evaluate the efficiency of alveolar ridge reconstruction with the lateral border of scapula (LBS) prior to implant placement and to assess onlay graft retention and bone resorption during a short term of function.

A total of 25 partially or fully edentulous patients with severe alveolar bone atrophy received ridge reconstruction with grafts harvested from the LBS. Histologic analysis of bone grafts was performed. Six months after augmentation, patients underwent CBCT and received dental implants. After another 3 months, healing abutments and implant-supported dentures were placed. Patients were followed for an average of 24 months.

Thirteen patients received primary bone grafting from LBS. Twelve patients experienced unsuccessful ridge reconstruction with other grafts before and were secondarily augmented with LBS. The average dimensions of LBS grafts were 6.3 × 2.3 × 1.2 cm. Histologic analysis confirmed the cortical nature of the graft. No donor-site complications occurred, and arm movements were restored within 2 weeks. buy compound 3k Following augmentation, two patients had sutures disrupted that healed uneventfully after revision. The average resorption of LBS grafts after 6 months was 12.2% ± 3.0%. link2 At the time of implant placement, the dimension of the ridge was 12.3 ± 2.0 mm and 6.9 ± 1.6 mm in height and width, respectively. The survival rate of the 174 implants placed was 98.3%.

LBS can be used as an alternative extraoral grafting site for extensive ridge reconstruction prior to implant placement.
LBS can be used as an alternative extraoral grafting site for extensive ridge reconstruction prior to implant placement.
The aim of this study was to inspect the mechanical fatigue behavior of an implant-supported restorative system using polyether ether ketone (PEEK) and yttria partially stabilized zirconia polycrystals (YZ) as materials for customized definitive implant-supported hybrid abutments, supporting two types of all-ceramic restorations translucent zirconia (TZ) and lithium disilicate (LD) monolithic crowns.

Forty Morse taper implants were included in epoxy resin. Titanium intermediary abutments were placed, and the specimens were randomly allocated into four groups (n = 10) according to the customized hybrid abutment material (PEEK or YZ) and the monolithic crowns (TZ or LD) representing a maxillary central incisor crown. The specimens were subjected to a mechanical fatigue test (step-stress analysis) by means of an initial 200-N load for 5,000 cycles and subsequent increase of 50 N (step-size) at each 10,000 cycles, until failure occurred. The load at failure and number of cycles until failure were recorded; suatform fractures for TZ groups.
YZ and PEEK hybrid abutments promoted similar fatigue levels regardless of the crown materials, TZ crowns promoted a higher fatigue level than LD ones when associated with YZ abutments, and LD crowns promoted a similar fatigue level to TZ ones when associated with PEEK custom abutments. Higher prevalence of crown fractures was shown for LD and screw/implant platform fractures for TZ groups.Sinus floor elevation with the lateral window approach has proven to be an effective treatment modality for vertical bone augmentation in the posterior region of the maxilla. The simultaneous implant placement during the procedure can be achieved if enough remaining bone height is available to obtain implant primary stability. However, the proper identification of the maxillary sinus boundaries for the window demarcation along with membrane protection for simultaneous implant placement can be challenging. This clinical report demonstrates a novel technique for sinus floor augmentation using a 3D modified implant-osseous-membrane surgical template to assist in the lateral window demarcation, membrane stabilization and protection, and guided implant placement in a partially edentulous patient who was eligible for one-stage sinus floor elevation. The surgical procedure for the sinus demarcation is simplified, the membrane stabilization and protection are effective, and the guided implant placement provided a predictable surgical positioning of the implants.
This retrospective study compared the long-term outcomes of dental implants according to type of connection and surface.

Multiunit restorations were classified as follows an external connection with a turned surface, an external connection with an anodized surface, or an internal connection with a fluoride-modified surface. Patients who were followed up for longer than 7 years after implant loading were included in the study. Cumulative implant survival rates and the amounts of marginal bone loss were calculated by reviewing dental records and radiographs. Only implants that survived until the last follow-up visit were included in the analysis of marginal bone loss. Statistical analyses were performed to detect between-group differences at the significance level of .05.

Sixty-nine patients with 261 bone-level implants were included. The average follow-up duration was 15.2 years in the external turned group, 10.6 years in the external anodized group, and 9.9 years in the internal fluoride-modified group. marginal bone resorption.
The implant-abutment connection structure is an important contributor to the maintenance of the level of marginal bone surrounding the implant. Implant surface characteristics are another contributor to marginal bone resorption.
Dental implant treatment is one of the most successful methods to replace lost teeth. However, several factors play a role in the early failure of implants, which could occur prior to the insertion of the restorative component. This study aimed to investigate the rate of early implant failure in the maxillary posterior area with and without sinus augmentation and other related risk factors.

Data were collected from the records of patients who received implant treatment in the posterior maxilla (premolars and molars). The information included whether the sinus was augmented or not, method of augmentation, sex, age, smoking, and medical history. In addition, length and diameter of the implant, whether the sinus membrane was perforated or not, implant sites, patients who received implants both with and without sinus augmentation, and manufacturers of the implants were also recorded.

A total of 1,343 patients who received 2,323 implants were included with a failure rate equal to 4.4%. Logistic regression showed that failure rate was significantly associated with smoking (odds ratio [OR] 7.843), diabetes (OR 3.190), older age groups (OR 1.027), and long implants (OR 1.177). Failure rate significantly decreased with the lateral augmentation procedure (OR 0.345).

The results suggested that the lateral augmentation procedure was negatively associated with failure rate. Yet, old age, smoking, diabetes, and longer implants showed a positive association with the increased rate.
The results suggested that the lateral augmentation procedure was negatively associated with failure rate. Yet, old age, smoking, diabetes, and longer implants showed a positive association with the increased rate.
To carry out a retrospective analysis of the placement of zygomatic implants in atrophic maxillae and to assess the outcomes in terms of survival rate and biologic complication incidence, with a follow-up of at least 1 year and in 13% of cases, longer than 5 years.

The study included all patients rehabilitated through zygomatic implant surgery from 2006 to 2017 and excluded those treated in 2018 to guarantee a minimum follow-up of 1 year. Depending on the specific case, one, two, or three zygomatic implants were placed in combination with conventional implants, or four zygomatic implants were placed alone (zygoma quad). All implants were placed by the same surgeon in a private clinic through an anatomy-guided surgical approach and were immediately loaded with screwed provisional prostheses up to the end of the osseointegration phase. Patients who did not undergo any or the last follow-up visits were not included in order to assess the real conditions of implants, soft tissues, and maxillary sinuses in theent, zygomatic implants may be considered a reliable treatment option in the case of severe atrophic maxillae.
In this study, the rehabilitation of atrophic maxillae through zygomatic implants was shown to be a predictable treatment, which allows a graftless approach and makes it possible to carry out immediate loading protocols, with enormous psychologic advantages for patients. link3 Survival rates are high, and complication incidence is low. Thus, at present, zygomatic implants may be considered a reliable treatment option in the case of severe atrophic maxillae.
Premature loss of a tooth element causes extensive local bone atrophy. Block biomaterials are used in patients with an atrophic maxilla to reshape the premaxilla bone. This study aimed to evaluate the responses to xenogeneic bone blocks at cellular and tissue levels.

Viability of human periodontal ligament stem cells (hPDLSCs) submitted to culture medium-containing substances leached from a xenogeneic block biomaterial (Orthogen) was assessed by the MTT assay. Cells grown in a fresh medium were used as the control. Cell viability was measured at 24, 48, and 72 hours. The results were statistically compared (α ≤ .05). Tissue response to the biomaterial was evaluated by the placement of xenogeneic blocks anchored with miniscrews in six patients with atrophic maxillae and a remaining cortical bone tissue thickness of 2.0 to 3.0 mm. After 8 months, specimens were collected from the grafted areas and analyzed under a light microscope for evaluating the types of collagen fibers and amount of newly formed bone tissue, using the Image-Pro Plus software program.

The number of viable cells was similar in both groups. The histologic sections revealed remaining biomaterial in 10.12% of the patients and newly formed bone in 21.57%.

The xenogeneic block biomaterial tested proved to be biocompatible in vitro, and the porosity of the block favored the in vivo formation of new bone matrix deposits.
The xenogeneic block biomaterial tested proved to be biocompatible in vitro, and the porosity of the block favored the in vivo formation of new bone matrix deposits.
To compare the accuracy of different modalities of implant placement-static fully guided, static half-guided, and freehand surgery-through meta-analysis.

A thorough electronic and manual systematic search was conducted to identify applicable randomized clinical trials (RCTs) for evaluating the implant positioning accuracy between different static implant navigation surgeries. The coronal and apical horizontal deviation, vertical deviation, apical angle, and chair time were estimated as the weighted mean differences and standard deviation with confidence intervals. A P value of .05 was set for statistical significance.

Based on the 10 RCTs that met the inclusion criteria for the quantitative analyses, results from the meta-analyses demonstrated the following (1) a coronal deviation significant difference favoring the fully guided approach compared with the half-guided (weighted mean difference of -0.51 mm) and freehand approaches (weighted mean difference of -1.18 mm); (2) a significant weighted mean difference between the fully guided and half-guided approaches in relation to the apical deviation (weighted mean difference of -0.
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