Libros

Purpose: To establish consensus-driven guidelines that could support the clinical decision-making process for implant-supported rehabilitation of the posterior atrophic maxilla and ultimately improve long-term treatment outcomes and patient satisfaction. Materials and methods: A total of 33 participants were enrolled (18 active members of the Italian Academy of Osseointegration and 15 international experts). Based on the available evidence, the development group discussed and proposed an initial list of 20 statements, which were later evalu-ated by all participants. After the forms were completed, the responses were sent for blinded ana-lysis. In most cases, when a consensus was not reached, the statements were rephrased and sent to the participants for another round of evaluation. Three rounds were planned. Results: After the first round of voting, participants came close to reaching a consensus on six statements, but no consensus was achieved for the other fourteen. Following this, nineteen statements were rephrased and sent to participants again for the second round of voting, after which a consensus was reached for six statements and almost reached for three statements, but no consensus was achieved for the other ten. All 13 statements upon which no consensus was reached were rephrased and included in the third round. After this round, a consensus was achieved for an additional nine statements and almost achieved for three statements, but no consensus was reached for the remaining statement. Conclusion: This Delphi consensus highlights the importance of accurate preoperative planning, taking into consideration the maxillomandibular relationship to meet the functional and aesthetic requirements of the final restoration. Emphasis is placed on the role played by the sinus bony walls and floor in providing essential elements for bone formation, and on evaluation of bucco-palatal sinus width for choosing between lateral and transcrestal sinus floor elevation. Tilted and trans-sinus implants are considered viable options, whereas caution is advised when placing pterygoid implants. Zygomatic implants are seen as a potential option in specific cases, such as for completely edentulous elderly or oncological patients, for whom conventional alternatives are unsuitable. Palabras clave: diagnostic procedure, implant dentistry, lateral window technique, pterygoid implants, sinus floor elevation, transcrestal sinus floor elevation, zygomatic implants The authors report no conflicts of interest relating to this study.

Objective: Surgical removal of third molars is often associated with complications. The aim of the present study was to analyze the incidence of complications following extraction of third molars relative to the risk factors. Method and Materials: This retrospective study included 463 patients who had mandibular third molar extraction (performed by a single surgeon, DSA) in the years 2001 to 2011. In total, 665 mandibular third molars were extracted. The average patient's age was 29 ± 11.30 years, median 26 years, and the patient age ranged from 13 to 75 years. Patients' records were obtained for medical/general data. Results: The overall prevalence of postsurgical complications was 17%. Dry sockets showed the highest incidence (11.6%). Partially impacted teeth showed the highest incidence of complications (67.3%). Cigarette smoking correlated with increased complications and dry sockets, and complications were more prevalent on the left side (62.8%). Conclusion: Complications after mandibular third molar extraction increase with age, level of impaction, side of extraction, and cigarette smoking. Palabras clave: cigarette smoking, dry sockets, mandible, partially impacted, tooth impaction, wisdom teeth

Implantat getragener Zahnersatz ist eine zuverlässige prothetische Option und dank hoher Erfolgsquoten haben Implantate für viele Patienten die Lebensqualität erhöht. Eine große Schwierigkeit ist der Erhalt der Hart- und Weichgewebe. Die Sofortinsertion von Implantaten in frischen Extraktionsalveolen ist für viele Patienten hier vorteilhaft, weil sich die Einheilzeiten verkürzen, der Alveolarfortsatz weniger stark resorbiert wird und optimale ästhetische Ergebnisse erzielt werden. Diagnose und Behandlungsplanung sind aber entscheidend für den Erfolg einer Insertion und prothetischen Versorgung von Implantaten unmittelbar nach einer Extraktion. Der Beitrag stellt verschiedene Fallbeispiele für die Sofortinsertion von Implantaten mit Sofortbelastung und provisorischer Versorgung vor. Palabras clave: Implantatprothetik, Sofortbelastung von Implantaten, Implantation in frische Extraktionsalveolen, provisorische Versorgung, Einzelzahnersatz, Ersatz mehrerer benachbarter Zähne, Totalprothetik

Purpose: The marginal bone loss (MBL) around implants placed in maxillary sinus grafts was evaluated. Materials and Methods: The study consisted of 70 patients who had undergone 81 sinus-graft procedures (total 212 screw-type implants). Complete radiographic records were available for 160 implants, which were used to calculate MBL (follow-up 6 to 56.5 months). Habits (smoking, bruxism), surgical phase parameters (preoperative residual bone, grafting material, implant characteristics, and complications), and prosthetic parameters (crown-implant ratio, marginal fit, and opposite-arch restoration) were recorded for each patient and statistically analyzed regarding MBL. Results: Cumulative survival and overall radiographic success rates were 95.5% and 83.7% for 4.5 years, respectively. Smoking, small implant surface area, and a delayed implantation approach were related to enhanced MBL, with mean MBL values of 0.24 mm/y (P .011), 0.21 mm/y (P .031), and 0.31 mm/y (P = .052), respectively. In residual bone of = 4 mm, the relation to enhanced MBL was stronger (P .018) for delayed implantation. Discussion: Survival and radiographic success rates compare well with other reports. However, most studies modify success criteria regarding MBL. Smoking may be a primary risk factor regarding implant success. Implants with greater surface area values could compensate for problematic bone characteristics (eg, in grafted maxillary sinuses). The effect of delayed implantation on MBL was surprising and may prompt simultaneous implantation whenever primary stability can be achieved. Conclusions: Smoking and implant surface area affected MBL in this patient population. Criteria for long-term implant success should be revised to a standard. Palabras clave: implant success, implant survival, marginal bone loss, radiographic success, sinus graft

Purpose: To compare marginal implant bone loss (MBL), survival, and radiographic evidence of success of dental implants among smokers and nonsmokers. Materials and Methods: Consecutive records of 161 patients (aged 23 to 89 years, mean 57 years) treated with a total of 646 implants between the years 1995 and 1998 were examined. Patients were divided into 3 groups: nonsmokers, moderate smokers, and heavy smokers. Tobacco exposure was calculated by cigarettes per day and by pack-years. Follow-up ranged from 1 to 7 years (mean 3.8 years). Postoperative panoramic radiographs obtained before implant exposure and annually thereafter were analyzed for MBL changes. The influence of smoking and other variables on MBL was analyzed at all implant sites. Results: Generally, smokers had more MBL than nonsmokers (0.153 ± 0.092 mm and 0.047 ± 0.048 mm, respectively; P .001). When each jaw was examined separately, smoking had a greater effect on MBL in the maxilla than in the mandible (0.158 ± 0.171 mm versus 0.146 ± 0.158 mm, respectively; P .001). Furthermore, in the maxilla, heavy smokers had the greatest amount of MBL (0.1897 ± 0.1825 mm), followed by moderate smokers (0.123 ± 0.156 mm) and nonsmokers (0.0460 ± 0.070 mm) (P .001). In the mandible, there was no distinction between heavy and moderate smokers, and both had greater MBL than nonsmokers (P .001). Only 3 of the 646 implants failed; the cumulative survival rate was 99.5%. Overall radiographic success rate was 93.2%. Nonsmokers had a higher radiographic success rate (97.1%) than smokers (87.8%) (P .001). Conclusions: This study demonstrated a relationship between MBL and smoking habits. A higher incidence of MBL was found in the smoking group, and this was more pronounced in the maxilla.

Purpose: The purpose of this study was to compare the marginal bone loss (MBL), complications, and 12-year survival rates of commercially pure titanium (cpTi) and hydroxyapatite (HA)-coated implants placed in the maxilla. Materials and Methods: The study group consisted of 120 patients (77 women, 43 men) treated from 1988 to 1997. A total of 388 implants (156 cpTi and 232 HA-coated) were placed in the maxilla. There were 126 immediate (32.5%) and 262 (67.5%) nonimmediate implants. Patients were evaluated annually. Mean follow-up was 60 ± 32.3 months. MBL was measured on radiographs using the implant threads as the dimensional reference. MBL, complications, and 12-year survival and success rates were correlated with implant coating, time of implantation, implant dimensions, and position in arch. Results: Total mean MBL was 1.07 ± 2.16 mm. MBL was significantly lower with cpTi implants (0.55 ± 1.04 mm) compared to HA-coated implants (1.51 ± 2.71 mm) (P .001). No statistical difference in regard to MBL was found between immediate and nonimmediate implants (0.86 ± 1.8 mm vs 1.16 ± 2.3 mm). The total 12-year survival rate was 91.4%. HA-coated implants had a significantly higher 12-year survival rate than cpTi implants (93.2% vs 89%; P .03). Nonimmediate implants had a significantly higher failure rate (8.2%) than the immediate implants (1.3%) (P .009). No correlation was found between type of implant coating and late implant failure. Discussion: Immediate implants can serve as a predictable option, providing higher survival and success rates. HA-coated implants tended to fail less during the surgical phase, but had higher mean MBL compared to cpTi implants. Conclusions: HA-coated implants had greater MBL than cpTi implants but a higher 12-year survival rate. Immediate implants had a lower failure rate than the nonimmediate implants in this study population.

Objective: The maxillary (or second division) nerve block is an effective method of achieving profound anesthesia of a hemimaxilla. This block can be used for procedures involving the maxillary sinus, including the maxillary sinus elevation procedure. The purpose of this study was to evaluate a computer-controlled anesthetic delivery system (Wand) for maxillary nerve block injection to attain maxillary sinus anesthesia for sinus floor elevation procedure. Method and materials: The study population consisted of 61 healthy adult patients, ranging in age from 40 to 72 years (mean 45 years), who received 76 maxillary nerve blocks (17 having both right and left maxillary blocks) by means of the Wand system via the greater palatine nerve approach, for sinus floor elevation procedure. Two patients (3%) were excluded from the study due to the inability to negotiate the greater palatine foramen. For each block, two cartridges of 2% lidocaine hydrochloride with adrenaline (1:100,000) were administered, using a 27-gauge-long needle. After ensuring the anesthetized areas (waiting time 2.5 minutes), the sinus elevation procedure was performed. Parameters recorded were the success or failure of anesthesia, positive (blood) aspiration, bony obstructions in the greater palatine canal, and complications. Results: The use of this technique increased the ability to more easily locate the greater palatine foramen. A local infiltration (at the incisor region) was needed in 13 (17%) of the blocks, and seven (9.2%) sites required an extra infraorbital block injection in addition to the maxillary nerve block. One block had a positive aspiration. There were no bony obstructions demonstrated in the canal interfering with the injection, and no complications were recorded. Conclusion: The Wand appears to offer a number of advantages over the hand-held syringe when the greater palatine block technique for the maxillary nerve block is used. It is suggested that, when indicated, and with the required knowledge and respect for the associated anatomy, this technique should be considered with greater ease and more confidence.

Purpose: To compare the incidence of complications related to onlay bone grafts (OBGs) and sinus lift operations (SLOs) among smokers and nonsmokers. Materials and Methods: Data from 143 operations performed during the years 1995 to 2003 were analyzed. There were 64 OBGs and 79 SLOs. Patients were divided into 3 groups: nonsmokers, mild smokers (up to 10 cigarettes per day), and heavy smokers (more than 10 cigarettes per day). Duration of smoking (less or more than 10 years) was recorded. OBG complications were classified as minor (hematoma, swelling, inflammation, or temporary paresthesia) or major (graft exposure or mobility). For the SLO, perforations of the schneiderian membrane were the main intraoperative complication; postoperative complications mostly consisted of swelling, acute or chronic sinus infection, or bleeding. Results: Of smokers having OBG, 50% experienced complications, compared to 23.1% of nonsmokers. Major complications were observed in one third of the smokers, compared to only 7.7% in nonsmokers. There was also a tendency toward complications in former smokers, although this relationship was not statistically significant. There was no relationship between SLO complications and smoking or a past smoking habit. Discussion: In the present study, smokers demonstrated significantly higher postoperative complications following OBG operations. Smoking did not influence the results in the SLO group. There was no statistically significant difference between complications and past smoking. This finding indicates that the risk of complications can be reduced up to the normal nonsmoker complication rate when smoking ceases. Conclusions: This study established a relationship between OBG complications and smoking in this patient population. A higher incidence of complications was found in the smoking group. There was no significant influence of smoking on SLO complications.

The survival rate of implants placed in the maxillary molar area in a 2-stage procedure was evaluated. Between 1990 and 1997, 60 consecutive patients (32 females and 28 males, mean age 51 years) received 87 implants to replace missing maxillary molar teeth. Radiographs were evaluated preoperatively for bone quantity (mesiodistal width, potential implant length not compromising the integrity of adjacent vital structures). Second-stage surgery was performed in a mean of 7.9 months postimplantation. The 5-year cumulative implant survival rate and the influence of implant characteristics (type, length, diameter, and coating) on implant failure and complication rates (between the 2 stages of surgery) were evaluated. The total 5-year cumulative survival rate was 95.4% (4 implants were lost). There were a total of 17 complications (premature spontaneous implant exposure) in non-failing implants, 11 with high and 6 with flat cover screws, respectively. Implantation in the edentulous maxillary molar area is a predictable procedure with a considerably high survival rate. The type of implant cover screw used can affect the complication rate. Palabras clave: implants, posterior maxilla, survival rate

Between 1990 and 1995, 214 implants were placed in 29 maxillae and mandibles of 22 patients following extraction of all residual teeth as a consequence of severe periodontal disease. All patients were discharged wearing immediate dentures. The implants were analyzed with regard to the number per arch, location, length, and diameter. The 5-year cumulative survival rate was 98.5%. The mean number of implants per arch was 7.5 for the maxilla and 7.2 for the mandible. The preferred implant locations were canines, central incisors, lateral incisors, and second premolars in the maxilla; and lateral incisors, first molars, and canines in the mandible. The mean implant length was 14.7 mm in the mandible and 14.5 mm in the maxilla. The mean implant diameter was 3.8 mm in the maxilla and 3.8 mm in the mandible. The results of the present study indicate that immediate implantation for fixed full-arch reconstruction can be considered a viable treatment alternative in patients with severe periodontal disease. Palabras clave: immediate implantation, residual teeth extraction