Category Archives: Management of the Patient Undergoing Radiotherapy or Chemotherapy

REFERENCES

REFERENCES
1. Grisius M: Salivary gland dysfunction: a review of systemic
therapies, Oral Surg Oral Med Oral PathoI92:1S6, 2001.
2. Khan Z,Jacobsen CS:Oral pilocarpine HCI’fOl:post-irradiation
xerostomia in head and neck cancer patients. In Proceedings
of the First International Congress on Max.illof(l~ial Prosthetics,
New York, 1995, Memorial Sloan-Kettering Cancer
Center.
41 6 PART IV • Infections
3. 5pijkervet FJ(: Irradiation mucositis, Copenhagen, 1991,
Mun-ksgaarC1.
4. Spljkervet FJ<et al: Effect of selective elimination of the oral
. flora on mucositis in trIadlated head and neck cancer
patients,’ Surg OncoI46:167, 199,1. .
5. Matheis }.oQ et al: Evaluation’ df oral mucositis In patients
receiving radiation therapy for head and neck cancer: a pilot
study of 0.12% chlorhexldine gluconate .oral hose. In Pr0-
ceedings of the First International Congress on MaxillofaCial Prosthetics,
New York, 1995, Memorial Sloan-Kettering Cancer
Center., ‘
6. FerrettiGAet al: ChlorheXIdineprophylaXisforchemotherapyand
radiation-induced stomatitis: a randomized doubleblind
trial, aral Surg Oral Med Oral Pathol 70:331, 1990.
7. Beumer J. Brady F: Dental management of the irradiated
patient, Int’ Oral Surg 7:208, 1978.
8. BeumerJ. Curtts T, Harrison RE:Radiation therapy of the oral
cavity. I. Sequelae and management, Head Neck Surg 1:301,
1979. ,
9. BeumerJ, Curtis T, Harrison RE:Radiation therapy of the oral’
cavity. II. Sequelae and management, Head Neck Surg 1:392,
1979. ‘
10.. Beumer J, Curtis TA,Morrish RB:Radiation complications in
edentulous patients” Prosthet Dent 36:193, 1976.
11. Driezen S et al: Prevention of xerostomia-related dental
cartes in irradiated cancer psttents, l Dent Res 56:99, 1977.
12. Bedwinek JM et al: Osteonecrosts in patients treated with
definitive radiotherapy for squamous cell carcinomas of the
oral cavity and naso and oropharynx, Radiology 119:665,
1976.
13. Starcke EN, Shannon IL:How critical is the Interval between
extractions and irradiation in patients with head and neck
malignancy? Oral Surg 43:333, 1977. ‘ .
14. Marx RE: A new concept in the treatment of osteoradionecrosis,
,Oral Maxillofac Surg 41:351,1983.
15. Marx RE: Osteoradionecrosis: a new concept in Its pathophystology,
Oral Maxillofac Surg 4.1:283, 1983.
16. Marx RE, Johnson RP, J<1ine SN: Prevention of osteoradionecrosis:
a randomized prospective clinical trial of hyperbaric
oxygen versus penidllm, Am Dent Assoc 111:49,1985.
17’. Hobo 5, Ichlda E, Garcia LT:Osseointegration and occlusal rehabilitation,
Tokyo, 1989, Quintessence. ‘
18. Granstrom G et al: Bone-anchored reconstruction of the Irra-
, diated head and neck cancer ‘patient, Otolaryngo; Head Neck
: Surg 108:334, 1993.
“‘” . ‘t.
, .
19. Vlsch LL, Levendag PC, Denlssen JiW: Five-year results of
227 HA-coated Implants in irradiated tissues. In Proceedings
of the First International Congress on Maxillofadal Prosthetics,
New York, 1995, Memorial Sloan-Kettermg Cancer Center.
20. Granstrom G, Iacobsson M, Tjellstrorn A:Titanium implants
in the Irradiated tissue. Benefits from hyperbaric oxygen, 1m
,Oral Maxillofac Implants 7:15, 1992.
21. Albrektsson T: A multicenter report on osseointegrated oral
implants,’ Ptosthet Dent 60:75, 1988.
22. TaylorTO, Worthington P: Osseointegrated implant rehabilitation
of the previously irradiated mandible: results of a limitedtrial
at 3 to 7 years, , Prosthet Dent 69:60, 1993.
23. Beumer J et al: Postradiation dental extractions: a review of
the literature and a report of 72 episodes, Head Neck Surg .
6:581, i983.
24. Murray CG et al; Radiation necrosis of the mandible: a
10-year study. I. Factors influencing the onset of necrosis, 1m
, Rqdiat Oncol BioI Phys 6:543, 1980.
25. Murray CG et al: Radiation necrosis of the mandible: a
10-year study. II, Dental factors: onset, duration, and management
of necrosis, Int I Radiat Oneol Bioi Phys 6:549, 1980.
26. Greenberg MS et al: Tl)e oral flora as a source of septicemia
in patients with acute leukemia, Oral Surg 53:32, 1~82.
27. McElroy TIf: Infection in the patient receiving chemotherapy:
oral considerations, , Am Dent Assoc 109:454, 1984.
28. Epstein JB: Antifungal therapy in oropharyngeal mycotic
infections, Oral Surg 69:32, 1990. ‘
29. Heimdahl A, Nord CE: Oral yeast Infections In Immunocompromised
and seriously diseased patients, Acta Odontol
Scand 48;77, 1990.
30. Odds FC et al: Carriage, of Candida species and C. albicans
, blotypes In patients undergoing chemotherapy or bone marrow
transplantation for haematological disease, l Clin Patho!
42:1259, 1989.
31. DePaola LG et al: Dental care for, patients receiving
chemotherapy, I Am Dent Assoc 112:198, 1986.
32. Wright WE et al: An oral disease prevention program for
patients receiving radiation and chemotherapy, , Am Dent
Assoc 110:43, 1985.
33. Thurmond JM et al: Oral Candida albicans in bone marrow
transplant patients given chlorhexldine ‘rinses: occurrence
and susceptibilities to the agent, Oral Surg 72:291, 1991

DENTAL MANAGEMENT OF PATIENTS ON SYSTEMIC CHEMOTHERAPY FOR MALIGNANT OISEASE

DENTAL MANAGEMENT OF PATIENTS ON SYSTEMIC CHEMOTHERAPY FOR MALIGNANT OISEASE

Destruction of malignant cells by tumoricidal chemotherapeutic drugs has proved an effective treatment for a variety of malignancies. Like radidtherapy, the antitumor effectof cancer chemotherapeutic agents is based on their ability to destroy or retard the division of rapidly proliferating
cells, such as tumor cells, nonspeclfically, Unfortunately, normal host cells that havea high mitotic index arealso adversely affected. Normal cells most affected are the epithelium of the gastrointestinal tract (including oral cavity) and the cells of the bone marrow.

Effects on Oral Mucosa
Many chemotherapeutic agents reduce the normal turnover rate of oral epithelium, which results in atrophic thinning of the oral -mucosa manifested clinically as painful, erythematous, and ulcerative mucosal
surfaces in the mouth. The effects are most noted on the unattached mucosa and rarely seen on gingival surfaces. These changes are seen within 1 week of the onset ‘of the administration of the antitumor agents.
The effects are usually self-limiting, and spontaneoushealing occurs in 2 to 3 weeks after cessation of the  agent.

FIG. 18-~ont:d F, Closure of soft tissues. G, Panoramic radiograph 8 months after surgery showing slight remodJling and healing of the bone.'

FIG. 18-~ont:d F, Closure of soft tissues. G, Panoramic radiograph 8 months after surgery showing
slight remodJling and healing of the bone.’

Effects on Hematopoietic System
Myelosuppression, as manifested by leukopenia, neutropenia, thrombocytopenia, and’ anemia, is a common
sequela ofseveralforms of cancer chemotherapy. Within 2 weeks of the beginning of chemotherapy administration, the white blood cell count falls to an extremely low level. The effect of .myelosuppresston in the oral cavity is marginal gingivitis. Mild infections may develop, and bleeding
from the girigiva is common. If the neutropenia is severe and prolonged, severe infections may develop. The microorganisms involved in these infections may be overgrowths of the usual oral flora, especially fungi; however, other microorganisms may be causative. Thrombocytopenia
can be marked, and spontaneous bleeding may occur. This is especially common in the oral cavity after oral hygiene measures. Recovery from myelosuppression is usually complete 3weeks after cessation of chemotherapy .

Effects on Oral.Microbiology
Chemotherapeutic agents, because of their immunosuppressive side effect, cause profound changes in the oral flora. For example, overgrowth of indigenous microbes, super infection with gram-negative bacilli, and opportunistic infections are all common sequelae and lead to patient discomfort and morbidity. Systemic infections are responsible for about 70% of the deaths in patients receiving myelosuppressive cancer chemotherapy.26,27 Oral microorganisms have been shown to be a common source  of bacteremia in these patlents.s” Thus most patients who
are on chemotherapy are treated concomitantly with systemic antimicrobial agents. However, in spite of these regimens,
patients·  requently develop overgrowth of some
organism , most commonly the Candida Spp.28-30 .

General Dental Management
In general, the principles of dental management for the patient who has had or will have radiotherapy apply equally well to the patient who has had or will have chernotherapy.U-V However, because of the intermittent
nature of the chemotherapy delivered in many instances, the minimal effects on the vasculature, and the almost  normal state of the individual between-chemotherapeutic administrations, dental management can be much easier.  The effects of the chemotherapy are almost always temporary, and, with the passage of time, systemic health
improves to optimal levels, which allows almost routine dental management .

Patients who have begun chemotherapy must maintain scrupulous oral hygiene. Thfs is difficult tn the face of mucositis and ulceration, which frequently occur. No dental procedures should be performed on any patient ‘receiving chemotherapy whose white blood cell and
piatelet status is unknown. In general, patients who have a. white blood cell count greater than or equal to 2000· rnm”, with at least 20% polymorphonuclear leukocytes and a platelet count greater than or equal to 50,000 mm3, can be treated in routine fashion. Prophylactic antibiotics
should be administered if the patient has had chemotherapy within 3 weeks of dental treatment. If the white blood cell count and platelet levels fall below those spectfled minimal oral care should be practiced, because
infection, severe blee ing, or both can occur. The patient may even need to avo d flossing and to use an extremely -soft toothbrush durin g these periods. Any removable dental appliance should be left out at these times to prevent ulceration of the fragile mucosa.

Treatment of Oral Candldosls
Initial treatment of candidosis is with topical application of an antifungal medication.P’ The advantage of using topical medication is that systemic side effects are minimized. Similarly in patients with persistent infection,
advantage can be gained by continuing topical agents in add~ign to systemic medications. The use of this combination may allow a reduced dose and duration of systemic administration of the antifungal medication and also may reduce the poterittalstde effects.

Another widely prescribed medication for oral candidosis is chlorhexidine mouth rinse. Chlorhexidine .(Peridex) has been shown to have potent antibacterial and antifungal properties in vitro. Its in vivo effects are
iess we\\ dOC ‘ll\ented, e~pe<:ia\\.y tot use against Caniiida
spp. in immunosuppressed individuals.3,33 However, it is used in most of such patients on the basis that it probably does no harm and may prove beneficial in many instances.

 

DENTAL MANAGEMENT OF PATIENTS UNDERGOING RADIOTHERAPY TO HEAD AND NECk

DENTAL MANAGEMENT OF PATIENTS UNDERGOING RADIOTHERAPY TO HEAD AND NECk

Radiotherapy (i.e., radiation therapy, x-ray treatment) is a common therapeutic modality for malignancies of the head and neck. Approximately 30,000 cases of ‘head and neck cancer occur each year. Many of these are managed by therapeutic irradiation. Its’ use is ideally predicated on the abilitv of the radiation to destroy neoplastic cells while sparing normal cells. In practice; howl ver, this is never actually achieved, and normal tissuesexperience some undesirable effect. Any neoplasm can
be destroyed by radiation if the dose delivered to the neoplastic cells is sufficient. The limiting factor is the amount of radiation that the surrounding tissues can tolerate.

Early in the’ course of radiotherapy, the oral mucosa shows the effects of treatment. The changes in and around the oral cavity as the result of destruction of the fine vasculature are most notable to dentistry. Salivary
glarids and bone are relatively radioresistant, but because ‘of the intense vascuiar compromise resultirig from radiotherapy, these tissues bear a considerable hardship in the long run.

Radiation Effects on Oral Mucosa 
The initial effect of radiotherapy On the oral mucosa, which is seen in the first 1 or 2 weeks, is an erythema that , may progress to a severe mucositis .with or without ulceration. Pain and dysphagia may be severe and make Mequate  utritional intake difficult. These mucosal reactions beg n to subside after completion of the course of radiothera y. The taste buds, also comprised of epithelial cells, show similar reactions. Loss of taste is it prominent complaint early in treatment and gradually returns, depending
on the quantity and quality of saliva that remains after treatment.

Radiation Effects on Salivary Glands

Salivary gland epithelium has a very slow turnover rate therefore the salivary glands might be expected, to be radioresistant. However, because of’the destruction of the fine vasculature by the radiation, the salivary glands show considerable damage, with resultant atrophy, fibrosis, and degeneration. This manifests clinically as xerostomia (the decreased production of saliva) and gives the patient a “dry mouth.” The severity of xerostomia , depends on which salivary glands were within the field of
radiation. A dry mouth may be the patient’s most significant complaint.

Treatment of Xerostomia
After radiotherapy, patients often complain of chronic dry mouth. At present no general agreement exists U)fJ’ cerning how to prevent these changes. Unfortunatety. in many cases, xerostomia never improves substantially, and exogenous replacement of saliva is necessary, For the
simplest form of replacement, water .can be sipped throughout the day. In addition, several saliva substitutes can be obtained without a prescription at the pharmacy. These substitutes contain several of the ions in saliva and’
other ingredients (e.g., glycerin) to mimic the-lubricating action of saliva. Unfortunately; artificlal salivas. on the market do not possess the protective proteins that are present in the salivary secretions. The patients are therefore still prone to the problems induced by xerostomia,
For comfort,  owever, many patients seem to be just as
satisfied with plain water as artificial salivas and keep small quantities available’ at all times to Sip.

Radiation Effects on Bone
One of the most severe and complicating sequelae Qf radiotherapy for patients with head and neck cancer is osteoradionecrosis (Fig. 18-2). Basically, osteoradionecrosis is devitalization of the bone by cancericidal doses of radiation. The bone within the radiation beam becomes
virtually non vital from an endarteritis that results in elimination of the fine vasculature within the bone. TQe turnover rate of any remaining viable bone is slowed to the point of being ineffective in self-repair. The continual
process. of remodeling normally found in bone does   t occur, and sharp areas on the alveolar ridge will notsmooth themselves, even with  onsiderable time. Theone of the mandible is denser and has a poorer bloodsupply than that of the. maxilla. Thus the mandible is thejaw most commonly affected with nonhealing ulcerations’and osteoradionecrosis.

Other Effects of Radlation
Patients undergoing radiotherapy may have an alteration in the normal oral flora, with overgrowth of anaerobic species and fungi. Most researchers feel that oral flora onizing the mucous membranes play an important role in the 2everity of, mucositis and subsequent healing .

FIG. 18-1' A, Typical 'clinical appearance of radiation caries, 8, Typical radiographic appearance of radiation caries, Note the erosion around the cervical portion of the teeth

FIG. 18-1′ A, Typical ‘clinical appearance of radiation caries, 8, Typical radiographic appearance
of radiation caries, Note the erosion around the cervical portion of the teeth

process.v’ Candida albicans commonly thrives in the oral cavities of patients who have been irradiated. It is not known whether the .alteratlon in the flora is caused by the radiation itself or the resultant xerostomia. Patients frequently require .the application of topical antifungal agents, such as nystatin, to help control the amount of Candida organisTl}s present. Another oral rinse frequently prescribed is 0.1 i)1c) chlorhexidine (Peridex). This agent has been shown to have potent in vitro antibacterial and antifungal effects. When used throughout the course of radiation treatment, it has been shown in at least one study to greatly reduce the prevalence and symptoms associated with radiation-induced mucositts.” Its use in other studies has been equlvocal.

Evaluation of Dentition Before Radiotherapy
The most feared side effect of radiotherapy is osteoradionecrosis.
Most patients develoment coin plication have residual teeth throughout the course of radio therapy. Thus the clinician may wonder what to do with
‘the teeth before irradiation. Should teeth be extracted.This question has no categorical answer; however, severo al factors must be eonsldered.

Condition of residual dentition.

All teeth with a -questionable or poor prognosis should be extracted before radiotherapy. The more advanced the periodontal condition, the more likely the patient is to develop caries and continued periodontitis. Although this may not be in keeping with usual dental principles, if in doubt, extract. Extraction in these cases may spare the patient months or
years of suffering from osteoradionecrosis .

Patient’s dental awareness.

The present state of the dentition and periodontium is a good clue to the past care they have received. In patients with excellent oralhygiene
and oral health, they should retain as many of the teeth as possible. Conversely, in patients who have neglectedoral health for years, the chances are

FIG, 1R-2 Pr c.gres5,v(: course of usteoradionecrosls- A, Rau,ograph showing radiolucencies in right rnand.bl« and around apex of molar tooth. 5, Six months later, during which time antibiotics and local irrigations were used, radiolucent: ress is spreading into ramus, Molar was removed at this time. C, Five months tier tooth removal" raction site did not heal and destructive process spread, resultillg in p:1lhologic fracture of rnandib l D, Radiograph after removal of devitalized bone, showing extent of process. (Courtesy Dt. Richard coot, Ann Arbor, M/.

FIG, 1R-2 Pr
c.gres5,v(: course of usteoradionecrosls- A, Rau,ograph showing radiolucencies in right
rnand.bl« and around apex of molar tooth. 5, Six months later, during which time antibiotics and local
irrigations were used, radiolucent: ress is spreading into ramus, Molar was removed at this time.
C, Five months tier tooth removal” raction site did not heal and destructive process spread, resultillg
in p:1lhologic fracture of rnandib l D, Radiograph after removal of devitalized bone, showing
extent of process. (Courtesy Dt. Richard coot, Ann Arbor, M/.

severe xerostomia and oral pain, which wil] make oral hygiene even more dillicult- I’rL’r”diotherapy patient preparatiun is similar to preorthodontic patient preparation. If an indiv idual cannot or will not can.’ for his or her
mouth before the application oi the braces, it will be impossible for him or her to do so when faced with ruture obstacles.

Radiation Location. The more saliyary glands ami bone involved in the field of radiation, the more severe will be the resultant xerostomia and vasi ular compromise of the jaws, Thus the dentist should discuss with the
radiotherapist the locations of the radiation beams and esnrnate tho seyerity of the probable xerostomia and hone changes, Xerqstomia by itself may not result- in the problems if the dentition can be maintained, bccduse the bone is still healthy, It is the combination of xerostomia and irradiated Done that usually causes theproblem. In individuals who will have radiation to the major salivarv glands and a portion of the mandible,
preirradiatlon extractions should be considered the radiotherapist agrees to delay the institution of irradiation for 1 to 2 weeks if the dentist feels that time is necessary to allow the extraction sites to begin to heal.
Squamous cell-carcinomas of the Of!!1cavitv make up approximately 9()’!i. of malignant tumors for which radiation therapy is used. Unfortunately, this cancer requires a \’ery large dose of radiation (greater tl1.1116000 rads [60 Gy]) to effect a result. Other malignancicv, such as 1~’I11-
phoma, require much less radiation fur a response, and the oral cavity wi]] therefore be less affected. Wilen the total dose falls below 5000 rads (50 G~·l. long-term side effects, such as xerostomia and osteoradionecrosis, are
dramatically decreased.

Preparation of Dentition for Radiotherapy

Every tooth to be maintained must be carefully inspected for pathologic conditions and restored to the best state of . health obtainable. A thorough prophylaxis and topical fluoride application should be performed before radiotherapy, Oral hygiene measures and instructions should be demonstrated and reinforced. Any sharp cusps should be rounded to prevent mechanical irritation. Impressions for dental casts should be obtained for fabrication of custom fluoride trays to be used during and after treatment, Because tobacco use and alcohol consumption irritate the
mucosa, the  patient should be encouraged to stop these before commencement of radiation therapy.

After radiation treatment the dcntivr should see the patient every 3 to  months prophylaxis is performed during these postirradiation visits, and topical fluoride • applications are made. The patient should be fitted with custom trays to deliver topical fluoride applications, The patient should be instructed in the use of the trays and in daily self-administration of topical fluoride applications. The use of a 1% fluoride rinse for 5 minutes each day has been found to decrease the incidence of radiation caries. II Over-the-counter fluoride rinses currently available can be used without a customized delivery splint with good success and seem to haw better tient acceptance.

 Method of Performing Preirradiation Extractions

If the decision has been made to extract some or all teeth before radiotherapy, the question becomes, “How should the teeth be extracted?” In general, the principles of atraumatic exodontia apply. However, the concepts of bone preservation are disregarded, and an attempt is
made to remove a good portion of the alveolar process along with the teeth and achieve a primary soft tissue closure. With the onset of radiotherapy, the normal remodeling process is inhibited; if any sharp areas of bone exist,
ulceration occurs with bone exposure. Thus the teeth are usually removed in a surgical manner, with flap reflection and generous bone removal.

Note: The dentist is ill a race against time. If the WOLIlld. ails
t(l heat, tile radiotherapv will b.e delaye.t. If the radiation i  elivered /}(‘(ol’e the wound heals, Ilcalil1S will take months or e\’el/ years.

Interval Between Preirradiation Extractions and Beginning of Radiotherapy

time should be allowed after extractions before beglnning radiotherapy. Obviously, the sooner radiotherapy is begun, the more beneficial it may be. Thus when the soft tissues have healed sufficiently, radiotherapy may begin. Iraditionally. 7″to 1-1days between tooth extraction and radiotherapy have been suggested.’·12.11 Most authors
base their recommendations on the clinical impression that rcepltheliallzatlon has occurred in this period. Howeve
radiotherapy should be delayed for 3 weeks after extraction, if possible. This helps to ensure that sufficient soft ttssu« hl’0ling has occurred. The radiotherapy should be delayed further, if )Jm’>ible, if a local wound dehiscence has {Jl’ ~IIT(‘d. In thi~ invtancc d,lily local wound care with irrigations and postoperative antibiotics aremandatory until the soft tissues have healed.

Tooth Extraction After Radiotherapy
Can teeth be extracted after radiotherapy and, if so, how These are probably the most difficult questions to answer. Each dentist has a view 011 this subject, and the literature is contradictory. Postirradiation extractions are also the most undesirable extractions the dentist will ever perform,
because the outcome is always uncertain.The answer to the question of whether extractions COIl  be done after radiotherapy is certainly, yes. The more important question is, How? If the tooth is to be extracted,
the dentist can either perform 11 simple extraction without primary soft tissue closure or a surgical extraction with alveoloplasty and primary closure. Either of these techniques yields similar results, with a certain concomitant incidence of osteoradionecrosis. The use of systemic
antibiotics is recommended.

Denture Wear in Postirradiation Edentulous Patients
Patients who were edentulous before radiotherapy manage very nicely-with well-constructed dentures-However, . patients rendered edentulous just before or after radiotherapy exhibit more problems with mucosal ulcerations and subsequent- osteoradionecrosis. The normal remodeling
process of the alveolar bone cannot smooth even the most minor irregularities left by extraction. With denture wear, these minor irregularities cause ulceration of the mucosa.

Use of Dental Implants in Irradiated Patients
The dental rehabilitation of the edentulous patient who has received radiation therapy is one of the greatest challenges facing the reconstructive dentist.· Many patients who have had ablative surgery for malignancy do not have the normal anatomy that makes denture wear possible.
There may be no vestibules tG accommodate a denture flange.

The time required for osseointegration will be prolonged in irradiated patients because of the lower metabolic activity. in the bone, “so the implants should not be loaded for at least 6 months after placement. The dentist must pay particular attention to oral hygiene in such
patients, because theirtissues will not beas able to resist bacterial invasion as tissues in patients who have not been irradiated. The prosthetic design should therefore be made as cleansable as possible, with frequent use of overdentures. These patients will require more careful followup
and hygiene measures.
In spite of the fear that implants placed into irradiated bone will d to osteoradionecrosis, it is uncommonly reported in e literature.21.22 However, there has been an , insufficient duration of experience to predict the longterm outcome of implant prosthetics in the patient who has undergone radiation.

Managmentof Patients Who DevelopOsteoradionecrosis
Most mucosal breakdown and subsequent osteoradionecrosis occur in the mandible. They occur most often in mandibles that have received radiation in’ excess of 6500 rads (65 Gy) and do not usually occur in mandibles
that have received radiation doses below 4800 rads (48Gy).23.25Severe pain may follow. The patient should discontinue wearing any prosthesis and try to maintain a good state of oral health. Irrigations should be instituted to remove necrotic debris (Fig. 18-3). Only occasionally’
are systemic – antibiotics necessary, because osteoradionecrosis is not an infection of the bone but rather a nonhealing hypoxic wound.P Because of the decreased vascularity of the tissues, systemic antibiotics do not gain
ready access t the area to perform thefunction for which they are intended. However, in acute secondary infections, antibiotics maybe useful to help prevent spread of the infection. Any loose sequestra are removed, but no
attempt is made in ially to close the soft tissues over the exposed bone. Most wounds smaller than 1 cm eventual. ly heal, although it may take weeks to months. For non healing wounds or ,extensive areas.

Reconstructive efforts with bone grafts used for conti nuity defects can also be undertaken successfully in many patients who have undergone irradiation. Free microvascular grafting techniques are becoming more popular for restoring continuity defects in patients who have
received radiotherapy. These bone grafts have their own blood supply from a reconnection of blood vessels and are therefore less dependent on the local tissues for incorporation and. healing.

FIG. 18-3 Osteoradionecruso vI tile lei, Ill,'; " ..ble, IL" i'",.l:;I~II~d " i,,:1 ~(",r)l: of tumoricidal radiotherapy for squamous cell corclnorna. The dentition W,l~ lemovt:d at the time of the cancer resection. This patient was prep-red fur treatment of the osteor,ldion<:crosis with pre- and postoperative hyperbaric oxygen treatments. A, Exposed devrtal hone: alan'] alveolar ridge of left mandible. B, Panoramic radiograph she-vine diffuse irregularity without good coruccuon of alveolar crest. C, Surgical exposure of tile area shows dcvital bone rnarqins and cl celltr,,1 oau.r devoid 01 bone

FIG. 18-3 Osteoradionecruso vI tile lei, Ill,’; ” ..ble, IL” i'”,.l:;I~II~d ” i,,:1 ~(“,r)l: of tumoricidal
radiotherapy for squamous cell corclnorna. The dentition W,l~ lemovt:d at the time of the cancer resection.
This patient was prep-red fur treatment of the osteor,ldionhyperbaric oxygen treatments. A, Exposed devrtal hone: alan’] alveolar ridge of left mandible.
B, Panoramic radiograph she-vine diffuse irregularity without good coruccuon of alveolar crest.
C, Surgical exposure of tile area shows dcvital bone rnarqins and cl celltr,,1 oau.r devoid 01 bone

_FIG. 18-3-<:ont'd 0, The bone.of the alveolar crest is removed, and the remainder smoothed with a bur until bleeding bone is encountered. The central crater is similarly burred out. E, Resected specimen of alveolar crest

_FIG. 18-3-<:ont’d 0, The bone.of the alveolar crest is removed, and the remainder
smoothed with a bur until bleeding bone is encountered. The central crater is similarly burred
out. E, Resected specimen of alveolar crest

 

 

CHAPTER OUTLINE

CHAPTER OUTLINE

DENTAL MANACEMENT OF PATIENTS UNDERGOING
RADIOTHERAPY TO HEAD AND NECK
Radiation Effects on Oral Mucosa
Radiation Effects on Salivary Glands
Treatment of Xerostomia
Radiation Effects on Bone
Other Effects of Radiation
Evaluation of Dentition Before Radiotherapy
Condition of Residual Dentition
Patient’s Dental Awareness
Immediacy of Radiotherapy
Radiation Location
Radiation Dose
Preparation of Dentition for Radiotherapy and
. Maintenance After Irradiation
Method of Performing Preirradiation Extractions
Interval Between Preirradiation Extractions and

Beginning of Radiotherapy
Impacted Third Molar Removal Before Radiotherapy
Method of Dealing. with Carious Teeth After
Radiotherapy
Tooth Extraction After Radiotherapy.
Denture Wear in Postirradiation Edentulous Patients
Use of Dental Implants in Irradiated Patients
Management of Patients Who Develop
Osteoradionecrosis·
DENTAL MANAGEMENT OF PATIENTS ON SYSTEMIC
CHEMOTHERAPY FOR MALIGNANT DISEASE
Effects on Oral Mucosa
Effects on Hematopoietic System
Effects on Oral Microbiology
General Dental Management
Treatment of Oral Candidosis